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MINUTES - 06021998 - SD3
SD.3 ��'"�} TBE BOARD OF SUPERVISORS OF CONTRA COSTA COUNTY, CALIFORNIA Adopted this Order on June 20, 1998, by the following vote: AYES: Supervisors Uilkema, Gerber, Canciamilla, DeSaulnier and Rogers NOES: None ABSENT: None ABSTAIN: None SUBJECT: EXPANSION OF SEWER TREATMENT PLANT PROJECT, DISCOVERY BAY AREA [Project 7373-6x9E901 (CDD-CP#98-46). On this date, the Board considered adoption of a Mitigated Negative Declaration and approval of a project comprised of the expansion of sewer treatment facilities for Contra Costa Sanitation District No. 19, Discovery Bay area. J. Michael Walford presented a staff report on the matter. The following persons addressed the Board: Al Box, 5578 Starfish Drive, Discovery Bay; Anthony Steller, 790 Beaver Court, Discovery Bay; Gary J. Hess, 1982, Cherry Pulls, Discovery Bay; Jerry Robison, 955 Willow Lake Road, Discovery Bay; Connie Mayo, 1886 Cherry Hills Drive, Discovery Bay; Lou .Kirkpatrick, 82 Edgeview Court, Discovery Bay, representing Country Club Homeowners; Joe Philbrick, 1957 Dolphin Place, Discovery Bay; David A. Piepito, 1464 Discovery Bay Blvd, Discovery Bay; Bruce Haight, 885 Santa Cruz Ave, Menlo Park, representing LDS church lands, Simon church lands, and Louie church lands. After receiving public testimony, the Board took the following action: CONTINUED consideration of the Sewer Treatment Plant Expansion Project; and DECLARED Intent to transfer jurisdiction, effective July 1, 1998, to Community Services District of Discovery Bay, unless otherwise requested by the Community Services District. I hereby certify that the foregoing is a true and correct copy of an action taken and entered on the minutes of the Board of Supervisors on the date shown. ATTESTED: Phil Batc , Clerk of the B6ard Supervisors and County Administrator 3une L. McHuen, Deputy Clerk CC: Director of Public works CACI - E. Kuevor Auditor-Controller Public works-Accounting Community Development TO: BOARD OF SUPERVISORS FROM: J. MICHAEL WALFORD, PUBLIC WORKS DIRECTOR DATE: JUNE 2, 1998 SUBJECT: ADOPT MITIGATED NEGATIVE DECLARATION, FIND NO SIGNIFICANT EFFECT ON ENVIRONMENT, AND APPROVE EXPANSION OF SEWER TREATMENT PLANT PROJECT, DISCOVERY BAY AREA. PROJECT NO. 7393-6X9E90. CDD-CP#98-46 SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION L Recommended Action: 1. HEAR and CONSIDER all comments, submitted during the public review period,during the public hearing and in the proposed negative declaration, to the Adoption of the Mitigated Negative Declaration and the Approval of the expansion of sewer treatment plant facilities for Contra Costa County Sanitation District No. 19 in the Discovery Bay area. 2. ADOPT the Mitigated Negative Declaration in compliance with the, California Environmental Quality Act, (the custodian of which is Delta Diablo Sanitation District serving as the contractual agent for Contra Costa County Sanitation District No. 19). See Attachment "A". 3. APPROVE Project comprised of the expansion of sewer treatment facilities for Contra Costa County Sanitation District No. 19 and the Mitigation Monitoring Plan as Attachment "B". \ i Continued on Attachment:— SIGNATURE RECOMMENDATION OF COUNTY ADMINISTRATOR ` _RECOMMENDATION OF BOARD COMMITTEE APPROVE _OTHER SIGNATURE (S): ACTION OF BOARD ON APPROVED AS RECOMMENDED „OTHER VOTE OF SUPERVISORS UNANIMOUS(ABSENT ) AYES: NOES: ABSENT: ABSTAIN: SE:cs g:\grpdata\spdist\BoardOrders\May\SD 14.wpd Orig.Div: Public Works(Special Districts) Contact: Skip Epperly(313-3253) cc: County Administrator Atm:E.Kucvor Auditor-Controller PW Accounting Construction Community Development-A. Woods J.Frattini-Design Division SUBJECT: ADOPT MITIGATED NEGATIVE DECLARATION AND FIND NO SIGNIFICANT EFFECT ON ENVIRONMENT, APPROVE EXPANSION OF SEWER! TREATMENT PLANT PROJECT, DISCOVERY BAY AREA. PROJECT NO. 7393-6X9E90. DATE: JUNE 16, 1998 PAGE: -2- 4. FIND, on the basis of the initial study and all comments received, that there is no substantial evidence that the project will have a significant effect on the environment. 5. DIRECT the Public Works Director to file a Notice of Determination with the County Clerk.. 6. DIRECT the Pubic Works Director to arrange for payment of the $25.00 handling fee to the County Clerk for the Notice of Determination. II. FINANC AL WEACI: The cost of this project will be provided for by the developer and will not impact the County General Fund. 111. gEASONS FOR RE 411 N I' NIBACKGROUN On December 20, 1994, the Board of Supervisors approved Resolution No. 941626 approving the General Plan Amendment (GPA) for the Discovery Bay West Project. The GPA contained a project description that contemplated that sewer treatment and collection would be provided through existing Contra Costa County Sanitation District No. 19 and that the existing treatment facilities would be improvedand expanded to meet increased usage. This requirement was subsequently articulated in the Conditions of Approval for Subdivision 7686. On July 25, 1995, the Board of Supervisors certified the final EIR for the Discovery Bay West Project (Subdivision#7686)calling for annexation of the project area into Contra Costa County Sanitation District No. 19. On April 2, 1996, the Board of Supervisors adopted Resolution No. 96/145 annexing the Discovery Bay West Project site (Subdivision#7686) into Contra Costa County Sanitation District No. 19 (LAFC 95-4- A). On May 20, 1997, the Contra Costa County Board of Supervisor's approved'a Joint Exercise of Power Agreement between Delta Diablo Sanitation District and Contra Costa County Sanitation District No.. 19. This agreement clarified the duties and responsibilities of Delta Diablo Sanitation District and gave the District the authority to perform design of capital improvements, to advertise and award construction contracts, and perform construction engineering. Need for 1k Emlet t: The proposed project is the construction of expanded wastewater treatment plant (WWTP) facilities needed to increase the capacity of the existing plant from 1.3 million gallons per day (mgd) to approximately 2.0 mgd, construction of collection facilities within the planned Discovery Bay West SUWECT: ADOPT MITIGATED NEGATIVE DECLARATION AND FIND NO SIGNIFICANT EFFECT ON ENVIRONMENT, APPROVE EXPANSION OF SEWER TREATMENT PLANT PROJECT, DISCOVERY BAY AREA. PROJECT NO. 7393-6X9E90. DATE: JUNE 16, 1998 PAGE: -3- (DBW)project; and modifications of existing collection and conveyance facilities needed to link the UBW project with the SD No. 19 WWTP. (The "WWTP is owned by the Contra Costa County Sanitation District No. 19 and operated by the Delta Diablo Sanitation District.) The SD No. 19 service area is located in eastern Contra Costa County, approximately 2 miles northeast of the historic business district of Byron. The existing WWTP is located in the southeast corner of the Discovery Bay community, just north of Highway 4. The Initial Study evaluates expansion of the plant at its current locations, as well as evaluating expansion in a nearby "study area", located on the south side of Highway 4. The development as proposed may result in exposure of property to geologic hazards and increased odors. The pumping stations within Discovery Bay West pose aesthetic, odor and noise problems. Additionally, there are short-term construction-related activities (especially within some portions of Discovery Bay and adjacent to the travel lanes of Highway 4) pose significant impacts, and there are potential impacts to special status species in the study area south of Highway 4. However, the District has agreed to measures that will mitigate those impacts to a less-than.-significant level. An expanded Initial. Study for the Discovery Bay Treatment Plant Expansion and Sewer Conveyance Master Plan was completed on April 28, 1998. The study found that the project as proposed.tt have a significant effect on the environment, and that a Mitigated Negative Declaration and Mitigation Monitoring Plan would be prepared. The comment period on the intent to adopt a Mitigated Negative Declaration closed at 5.170 p.m. on June 1, 1998. The comments received during the review period did not identify any new potential impacts or necessitate modification of the Expanded Initial Study. The mitigation measures identified in the Expanded Initial Study are contained in the Mitigation Monitoring plan for the Discovery Bay Treatment Plant Expansion and Sewer',Conveyance Master Plan. The Discovery Bay Municipal Advisory Council (DBMAC} has considered the Initial Study at their April 10`", April 15", April 23`°, May 6`h, and May 26 , 1998 meetings. Comments and suggestions were received by staff during these meetings, and presentation of the proposed'; project was made to the community, and information was provided on the public hearing process and on the Expanded Initial Study. It was the recommendation of the DBMAC and in concurrence by the members elect of the Discovery Bay Community Services District to refer the Initial Study and Mitigated Negative Study to the Board of Supervisors for adoption and approval for the sewer treatment plant expansion project. IV. CONSFARMCM OF NWA= ACTION: Delay in approving the project will result in a delay of design and construction. CONTRA COSTA. COUNTY M + SANITATION DISTRICT NO J g Public Works Department .; 253 GJ ACIER DLIV&MARTINEZ,CALIFORNIA Delta:Diable Sanitation District Phone: (925) 778-4040 ext. 274 ���•.. �*r r,� cblirf NOTICE OF PUBLIC REVIEW AND INTENT TO ADOPT A PROPOSED MITIGATED NEGATIVE DECLARATION Pursuant to the State of California Public Resources Code and the"Guidelines for Implementation of the California Environmental Quality Act of 1970" as amended to date, this is to advise you that the Contra Costa County Sanitatioi 1 Elistrtct N.G. 1 -- has prepared an Initial Study on the following project: t { 1. PROJECT TITLE: APR 2 3 1998 Discovery Bay Treatment Plant Expansion a �_ -� Sewer Conveyance Master Plan S.Z..WE ,C Contra Costa County Sanitation District No 19 66N C STA� ;; SY _ DEPUTY f 2. PROJECT DESCRIPTION: The proposed projec wastewater treatment plant (WWTP) facilities needed to increase the capacity of the existing,plant from 1.3 million gallons per day(mgd)to approximately 2.0 mgd, construction of collection facilities within the planned Discovery Bay West (DBW) project; and modifications of existing collection and conveyance facilities needed to link the DBW project with the SD No. 19 WWTP. (The WWTP is owned by the Contra Costa County Sanitation District No.19 and operated by the Delta Diablo Sanitation District.) The SD No.19 service area is located In eastern Contra Costa County, approximately 2 miles northeast of the historic business district of Byron. The existing WWTP is located in the southeast corner of the Discovery Bay community,just north of Highway 4. The Initial Study evaluates expansion of the plant at its current location, as well as evaluating expansion in a nearby"study area", located on the south side of Highway 4. 3. AUTHORITY: On May 20, 1997, the Contra Costa County Board of Supervisor's approved a Joint Exercise of Power Agreement between Delta Diablo Sanitation District and Contra Costa County Sanitation District No. 19. This agreement clarified the duties and responsibilities of Delta Diablo Sanitation District with respect to performing design of capital improvements;advertising and awarding construction contracts; performing construction engineering, Page I of 2 s administration and inspection;and approval and acceptance of capital projects. For this reason, Delta Diablo Sanitation District shall be the agency responsible for receiving written comments relative to the proposed Mitigated Negative Declaration. 4. TIME PERIOD FOR REVIEW: Public review of the Initial Study begins April 23, 1998 and extends to 5 PM on June 1, 1998 (total 38 days). Any comments should be in writing and submitted to the following address: Mark De Maio Delta Diablo Sanitation District 2500 Pittsburg - Antioch Highway Antioch, CA 94509 5. LOCATION OF RELEVANT DOCUMENTS: The plans and Expanded Initial Study are available for review in the offices of the Delta Diablo Sanitation District (M-F 8:00-11:30 AM and 1:004:30 PM). They are also available for review at the Brentwood Public Library at 751 3rd Street (Monday 12 - 8 pm; Tuesday 10 am - 6 pm; Thursday 1-6 pm; Friday 1-5 pm; Saturday 1-5 pm) and at the County Public Works Department (Monday- Thursday, 8 - 11:30 am; 1 - 4 pm). 6. 'SIGNIFICANT ENVIRONMENTAL IMPACTS: The development as proposed may result in exposure of property to geologic hazards and increased odors. The pumping stations within Discovery Bay West pose aesthetic, odor and noise problems. Additionally, there are short-term construction-related activities (especially within some portions of'Discovery Bay and adjacent to the travel lanes of Highway 4) that pose significant impacts, and there are potential impacts to special status species in the study area south of Highway 4. However, the District has agreed to measures that will mitigate those impacts to a less-than-significant level. 7. HEARING NOTICE: The County Board of Supervisors, in their capacity as Directors of Sanitation District No. 19, will hold a public hearing to consider the adequacy of the initial Study and to consider approval of the project on Tuesday, June 2, The hearing will be held at the McBrien Administration Building, Room 107, 651 Pine Street, Martinez, CA. cc: County Clerk's Office(2 copies) Delta Diablo Sanitation District Brentwood Public Library Contra Costa County,Public Works Department Att: Vicinity Map(USES) Page 2 of ATTACHMENT "B" Mitigation Monitoring Plan May 28, 1998 RECEIVED To: Joe Canciamilla, Supervisor District 5 Phil Batchelor, Contra Costa Board of Supervisors MAY 2 9 1998 Subject : Discovery Bay Wastewater Plant Expansion CLE�-i,a L ARD OF SUPERVISORS CONTRA COSTA CO, Dear Joe and Supervisors : The Discovery Bay elected Community Services District Board of Directors agreed to request the following at it ' s meeting on May 27, 1998 . Reject the Negative Declaration of the Initial Study of the wastewater plant as inadequate and institute an Environmental Impact Report for the expansion of the facility. The CSD Board came to this conclusion after two CEQA hearings that were held during the month of May. We respectfully ask that the Board of Supervisors consider our request when the issue is presented for your consideration. Sincerely yours, Bill Slifer, Chairman Discovery Bay Community Services District .............................. .................... ........I.......... FIDS REVD .?u '" i 1964 Cherry Hills Drive GL RK sup YMSORS Discovery Bay, CA 94514 co nqTA CO. June 1, 1998 CONTRA COSTA COUNTY BOARD OF SUPERVISORS Re: Discovery Bay Sewage Treatment System To Whom It May Concern: We do not want to see the existing sewage treatment system expanded to accommodate more homes being built in our area. The current sewage treatment system located adjacent to our home on Cherry Hills Drive emits foul odors, and who knows what else, into the environment that we breath. We do not want to see the system expanded which would, no doubt, create more odors in our neighborhood. We would like to see the County research the environmental impact that this would have on our community and consider moving the system to the the south side of Highway 4. Sincerely, Ken Virgin Mary Jo Virgin ..............I'll.,........ (} rfttQ t QLD kt do A0 a 0 N�31� Nor Cherry Hills Drive Discovery Bay, Ca N3 May 27, 1998 _ Mr. Joe Canciailla Supervisor 5th District 315 East Leland Rd. Suite 100 Pittsburg, Ca 94.565 Dear Mr. Canciamilla, As disclosed in our recent Discovery Bay MAC meetings, SAN 19 has recommended and prefers"Plan I" (expansion of our existing waste water treatment plant to accommodate the additional needs of Discovery Bay West and Centrex homes). This is absolutely unacceptable to residence who live in close proximity to the existing plant which has had numerous occasions of oderistic problems at it's current capacity. This poises is a real threat in our minds, both from a health view point and from a community home value perspective, due to the close proximity of sewage treatment to family homes. To expand this treatment plant when there has not been a complete Environmental Impact Report completed which would test airborne particles for cartigents, chemicals, etc.- is absolutely irresponsible. We respectfully request that Plan 1 not be allowed to go further, that a full Environmental Impact Report be conducted on the effects of the expansion on the health and well beim of current residents and that the final decision on this issue be returned to our local, newly seated board for determination. Sincerely, Residence of Discovery Bay, Cherry 1111s Drive NAME(PRINT) SIGNATURE ADDRESS jJ /hr P19 I J Arbir ja"I J—g e—* Or. 's y s s '� � �� M �# , yo 4, f ", > 4A tin 41 L4� Po ILL � 9 tr " !} j( u.+n ...__.,�• ,,, �... ._.3`0-. �,r - - �''� � `�, tit -., RECEIVED JUN - 2 Cherry Hills D . Discovery Bay, 0 OF S1JPEAVISORS May 27, 1998 COSTA CO. To: Contra Costa County Burd of Supervisors We were present at the Discovery Bay MAC meeting on May 26th and we were absolutely appalled as SAN 19 presented their preferred sewer expansion plan of option 1 . As Hofmann homeowners we are not only outraged by the lack of concern by this developer, but we are mortified by the tactics used to push through a plan that would obviously affect the overall health of our entire community. To our knowledge there has been no Environmental Impact Report completed, which only leads us to believe that greed has overcome this developer 'No ESR' is unacceptable, and option 1 is unacceptable. Sincerely, Brenda Hernandez 1826 Cherry Hills Dr. Jeff Hernandez Connie Mayo 1885 Cherry Hills Dr. Steve Mayo RECE, May 30, 1998 `UN - 21 To: C BC�AgL?OF SUpEFjVI Contra Cost. County Beard of Supervisors COST --... � From: Ray and.Jane Mall 1946 Cherry Hills Drive Discovery Bay, Ca. 94514 ( 925) 634.7055 Subject: Against the expansion of the Sewage Waste Treatment Piaci located on Cherry Hills lir. Discovery Bay. Our home is located 300 feet from the waste treatment plant on Cherry Hills Drive. We are the original owners and have lived here trine years. We love our neighborhood but at times the Waste Treatment plant emits a strong odor. Don't be fooled by anyone telling you the existing plant does not produce foul smells. We have a concern of increased odor if the expansion of the plant is allowed. Please make the developer relocate the plant to a more distant location. Thanks, Ray Hall Jane Hall DISCOVERY BAY COUNTRY CLUB RESIDENTIAL ASSOCIATION Jane 2, 1998 S q CLERK BOARD OF SUPERVISORS Y M. The Honorable Jim Rogers and Board of Supervisors 651. Pine Martinez, CA 94553 Re. Discovery Bay Sewage Disposal Facilities Dear Mr. Chairman and Board Members: The Discovery Bay Country Club Residential Association ("Association")represents over 1,203 voters in Contra Costa County. The Association wishes to express our concern that the sewage disposal facilities that serve our community be expanded in an acceptable manner. The Association is separate and distinct from the Discovery Bay Property Owners Association:,Inc.which has also voiced concerns about this issue on behalf ofit more than 3,000 members. Currently,we have three issues,(1)that the California Environmental Quality Act("CEQA:") be fully complied with.;(2)that the county avoid creating a public nuisance by expanding the facility; and (3) that no decisions be made until the Discovery Bay Community Services District is fully operational next month. As you may aware,since the original sewage disposal facilitywas constructed,more homes have been::built nearby. As a result,there is the distinct possibility that noxious and perhaps harmful particulates may affect adjacent residents. In addition, obnoxious and offensive odors may drift through the adjacent neighborhoods. In order to fully identify and adequately mitigate these problems, the Association requests that you fully comply with CEQ.Au in a manner that includes a focused analysis of the potential for harmful particulates and offensive odors to affect adjacent residents. The Association also requests that you make every effort to avoid creating a public nuisance by expanding the facilities in,a manner that will adversely affect the immediately adjacent neighbors. Of the options developed to date, the Association believes that Alternative 4 would he the least intrusive means of expanding the system. Therefore,we request that you give every consideration to that option. FitmUy,U=Discovery Bay Community Services District is being formed to oversee water and wastewater issues for our community. It will be fury Operational by Julyl, 1998, and will represent the voice of the immediate community with respect to issues it has jurisdiction over. The Association feels strongly that a decision concerning the expansion of the sewage disposal facility should not be made without the participation of the Community Services District. Therefore,we request that you postpone any decisions concerning this matter until alter July 1, 1998. The Association does not oppose the expansion project. We realize there is a geed to enlarge the system and that our members will directly benefit from this expansion. However,we are gravely concerned that the expansion be accomplished in an acceptable manner. Therefore,we intend to fulls' participate in the process, and to pursue all available avenues in the event'our issues are not adequately addressed. Please add the .Association to the mailing list so that we notified of all hearings that are scheduled on this matter. We look forward to your continuing interest and support as our elected representatives. Sincerely, BOARD OF DIRECTORS DISCOVERY BAY COUNTRY CLUB RESIDENTIAL ASSOCIATION Lou Kh—kpatrick, President aro t cc,Treasurer Virgil Koebse, Secxeu" 1855 Gateway Blvd,Suite 340 Concord,CA 94520 925-"7-1855 DISCOVERY BAY COUNTRY CLUB BESIDENTLLL ASSOCIATION yt,RECEIVED June 2, 199$ JUN — 1 BQAEi£)'C+ J' a+3C CtlNTR A CPS-yf :.. The Honorable Tun Rogers and Board of Supervisors 651 Pine Martinez, CA 94553 Re: Discovery Bay Sewage Disposal Facilities Dear Mr. Chairman and Board Members: The Discovery Bay Country Club Residential Association ("Association")represents over 1,200 voters in Contra Costa County. The Association wishes to express our concern that the sewage disposal facilities that serve our comity be expanded in an acceptable manner. The Association is separate and distinct fromthe Discovery Bay Property OwnersAssociation,Inc.which has also voiced concerns about this issue on behalf of it more than 3,004 members. Curr,we have three issues;(1)that the California Environmental Quality Act("CEQA") be fully complied with;(2)that the county avoid creating a public nuisance by expanding the facility; and (3')that no decisions be made until the Discovery:Bay Community Services District is fully operational next month. As you maybe aware,sincethe original sewage disposal facility was constructed,more homes have been built nearby. As a result,there is the distinct possibility that noxious and perhaps harmful particulates may affect adjacent residents. In addition, obnoxious and offensive odors may drift through the adjacent neighborhoods. In order to fully identify and adequately mitigate these problems, the Association: requests that you fully comply with:CEQA in a manner that includes a focused analysis of the potential for harmf l particulates and offensive odors to affect adjacent residents. The Association also requests that you make every effort to avoid creating a public nuisance by expanding the facilities in a manner that will adversely affect the immediately adjacent neighbors. Of the options developed to date, the Association believes that Alternative 4 would be the least intrusive means of expanding the system. Therefore,we request that you give every consideration to that option. Finally,the Discovery Day Community Services District is being formed to oversee water and wastewater issues for our comm. It will be My operational by Julyl, 1 098, and will represent the voice ofthe immediate community with respect to issues it has isd iction over. The Association feels strongly that a decision concerning the expansion of the sewage disposal facility should not he made without the participation of the Comnnmity Services District. Therefore,we request that you postpone any decisions concerning this matter until after My 1, 1008. The.Association does not oppose the expansion project. We realize there is a need to enlarge the system and that our members wdl directly benefit f om,this expansion. However,we are gravely concerned that the expansion be accomplished in an acceptable manner. Therefore,we intend to fully participate in the process, and to pursue all available avenues in the event our issues are not adequately addressed. Please add the Association to the mailing list so than we notified of all hearings that are scheduled on this matter. We Took forward to your continuing interest and support as our elected representatives. Sincerely, BOARD OF DIRECTORS DISCOVERY BAY COUNTRY CLUB RESIDENTIAL ASSOCIATION Lou Kirkpatrick,President 4aroFMce,4Tre-as#/ Virgil Koehne, Secretary 1855 Gateway Blvd,Suite 340 Concord,CA 9452() 925-687-1855 R vim x `may+{ .�^✓ '9f .^,'rq� 'T�r.'�` � � ...:'SST h h'� �•i a�Atom 1 b sa is ;00 ti 8# m a•aua # too 9• " o # f" ;£R 'as H : £ B£ a b § "",..,.,..,.,........,.....,................................................................................................................................................................�. .i::: ,::::::::::::::::::::::::::::::::::::::::::::::::;:::::;:;:;:;:;:::;:;:;:;:::;:;:;:;:;:;:;:;:;*;:;:;:;:;:;:;:; . - - . .........-........ .,.:�..,...-....-.....,--...-.-.........-....."",,--,--.-....e.:..-...:"......:.. .....---- ..- i:i:i:i:i:i:;:i:i:i:i:i:i:i:i:i:i:i:i:i:i:i:i:::i::.i.::::i:.:.:..i.:.:.:.:.:.:.:..:...i:::::::�:::::::i:::::::i:::::.:: -:::::::::::::� .., , - :, ........--...-. -..:�.:.-::,.--..--: .--- . ...:. ..:.""--'-...-...-.-..-.....:: .- .-. ....... ..,.,.. ..,::-.-.-- - ... .. ........ . ..... .. .... .. 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I I.",, ,',,I -,- ..." 111.111.1 11 I I I 11-1".''..,I I.",", 11'I,I I 1.1.1-1.1-1. �.. - - I I"I'':.".I'I,''.'l-, ''",.,.""..,1.11.1'I'll I ..'',".".",.'I,,..-11.1.1 1...1.1.., I I.. 1. 11 . . . . I I - . � I , ''I'll - - .1 I. ., I I I .11.1... ., -..,''. -.1-I- I., .1 I -1.111. I - . .- I I , . . � . I I , 11 . . I' ll . .. ",-, 1,11.1 ''I. I.. , I.,..........-... ...... .-I....... .... I.'',''''.... .,.,.,, '11, - I I I I I . 1.11 I I .I - .1,, I...I ".- ,1''. .'',...I -''-..'',I I .-I'll .1 I...I.... I .1111.111 , I , . . . '' ..''' ' . .I I I I'll , I , I.,.. 1. ''Ill.- .11 I., 11 .. ................11.1-1........-l'...'''.11 .11, '-..-,,-,-,. ........1.11 , 11, 111. ..., .11 . I I I . .. ,11.. ....''I''. ''' '. '', I 1.11.1 I .11 .1 ''..''', 11 ,.-.-,.,,-..,.,... .....''., 1.1.1-I.I.- - I . � I I 11 I I. . '', I ' ' . 11 ...- , , ., . '',.,.,..,.........''I'll'''',......................I.-...I-.11.11''..''...''I ..''I''.. ,I . , - . I , - ...11, -.1.1,I.- , , .11.I 11 .1 ..,''I.''. I..'' . .,1.11,I .... I......... . '' ''''''I ,.................-11.I I I I I I I . 111 , I 11 11,"I I. . . I .,..",,., 1.I 1, 11"I I- "..- I 111.1 I.,I I 11 -1.11.1 ...", .'..''..'..".."', , .'."'..".11.11, ,.,.,. ,1.11 1.1--l-I'll.,..".1.1.1"1.111...1.I 11"., 11 I..............- I, I 1. . 11 I . 1 . I'll ., I , ,. , . I .' '.. -......I ,- ., I .I'll, , -'' ''..''.1111.1, . I � ......... ......... ......._. _..._.. ... ........ ........ ....... ...._..... .. .................__.... ......... ......... ......... ....._... .............................. TABLE OF CONTENTS I. INTRODUCTION 1 2. FORMAT 2 3. NEED FOR PROJECT 2 4. PREVIOUS EIRs 6 S. ACRONYMS 7 6. PROJECT DESCRIPTION 7 7. PERMITS 18 8. CHECKLIST 19 I .....................................-....... ............ ....................................................................... . . .. .......... ..................................... TABLE OF CONTENTS List of Figures 1. Regional Setting Map 3 2. USGS Topographic Map 8 3. Aerial Photograph 9 4. Wastewater Facility Expansion Alternatives 11 5. Discovery Bay West Conveyance Plan Overview 13 6. Collection System Improvements Required Prior to Occupancy of I st and 251 st Unit 15 7. Collection System Improvements Required Prior to Occupancy of 651 stand 1,201 st Unit 16 8. Collection System Improvements Required Prior to Occupancy of 1,501st Dwelling Unit 17 9. Quaternary System Deposits Map 21 10. Subsurface Exploration Map, Lands South of Highway 4 23 11. Land Use Map,WWTP and Study Area Vicinity 30 12. Views A&B 35 13. Views C&D 36 14. General Plan Land Use 45 15. Zoning Map 47 16. Views E,F&G 54 Tables 1. Wastewater from Existing and Approved Projects 5 Appendices Appendix A: Chronic Toxicity Evaluation of Effluent from the Delta Diablo Wastewater Treatment Plan Appendix B: Geologic/Seismic Reference Materials Appendix C: Special Status Wildlife Habitat Assessment Delta Diablo Sanitation District Plant Expansion, Contra Costa County, California EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN 1. INTRODUCTION This Initial Study is an expanded impact analysis prepared for Sanitation District No 19(SD No. 19)(the Lead Agency)pursuant to the California Environmental Quality Act(CEQA)and related State EIR Guidelines (Section 15080)of the California Administrative Code. It is also intended to be used by other agencies having permit granting authority. On July 19, 1985 the County Board of Supervisors approved a service agreement between SD No. 19 and the Delta Diablo Sanitation District(DDSD)for the operation of water and wastewater facilities in the Discovery Bay area. More recently,a Joint Exercise of Powers Agreement clarified DDSD responsibilities with respect to capital improvement projects. They include performing' design of capital improvements, awarding contracts,administration and inspection, and approval/acceptance of capital projects. The purpose of this Expanded Initial Study is to: a) facilitate environmental assessment early in the design of the project; b) describe the environmental setting and identify project-related environmental effects; c) identify ways to mitigate significant adverse impacts to insignificant levels; d) explain project relationships to existing zoning and plans; e) provide a factual basis for determining whether a Negative Declaration is appropriate; and f) provide a level of impact assessment adequate to guide'full processing of the proposed action. g) quantify the magnitude of identified potential impacts; h) determine if the potential impact is significant, using criteria presented in the CEQA Guidelines,Appendix G;and i) specify mitigation measures to be incorporated into the project design. State EIR Guidelines provide that where a project is revised and/or impact mitigated in response to an Initial Study so that no significant environmental effects would occur, a Negative Declaration shall be prepared instead of an EIR A Negative Declaration is a statement written by the Lead Agency briefly describing the reasons why a proposed project will not have a significant effect on the environment,_and therefore does not require an EIR. To provide the lead agency with the option of a Negative Declaration, this attachment suggests a set of project revisions and refinements which, in response to identified potential impacts,would ensure that no significant environmental effects would occur as a result of the project. These suggestions are presented in Section 8 in the form of mitigation measures which SD No. 19 might 1 .... ................_. _.................. ........... DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STLMY AND SEVER CONVEYANCE MASTER PLAN APRIL 1998 choose to incorporate into the project. Incorporation of this mitigation into the project would be the basis for a Negative Declaration. This report is organized to address all potentially significant issues as required by CEQA Guidelines. Carollo Engineers were retained by DDSD to develop a facility plan for the Wastewater Treatment Plant(WWTP)expansion and to prepare a collection system master plan. The plans that were the subject of this Initial Study may be identified as follows: Carollo Engineers Carollo Engineers Delta Diablo Sanitation District Sewer Conveyance Master Plan Report Discovery Bay Wastewater April 1998 Treatment Plant Expansion Treatment Analysis April 1998 2. FORMAT CEQA does not prescribe a format for Initial Studies, but includes sample checklists in its Appendix H and I. Public agencies are free to devise their own format for an Initial Study. For this project we have used the checklist format of the Contra Costa County Community Development Department. 3. NEED FOR PROJECT Background The WWTP is located in the southeast corner of the Discovery Bay area, adjacent to and north of State Route 4 and approximately 25 miles east of Concord,California(see Figure 1). The WWTP is located one mile west of Old .River. Discovery Bay, Discovery Bay West, Centex (Albers), Byron 78, and other developments consist primarily of residential housing with supporting commercial and service establishments. Currently, no industrial components exist within the WWTP service area. The existing WWTP is owned by Contra Costa County Sanitation District 19 (SD No. 19) and is operated by the DDSD. In the mid-1990s, action was taken to annex Discovery Bay West to SD No. 19. As of July 1998, SD No. 19 will be dissolved and the Discovery Bay Community Services District will be created to provide sewer and water services to these developments. The sphere of influence for the Discovery Bay Community Services District includes Discovery Bay, Discovery Bay West (DBW), Centex (Albers), Byron 78, and the properties that are between DBW and Discovery Bay. The original design capacity of the facility was 1.2 million gallons per day(mgd). Modifications to the oxidation ditch in the late 1980s increased the plant capacity to 1.3 mgd. A design capacity 2 char adFd+J-•',,..+{ r g Ynd.mmF / �Y�., ::�r,; a,,,rJ, �.,•_ +fig. ...' it „`.? -� �.✓�� i..�a �j R'' mY F+awgdm�nt•• � � tY`d' " Wast sxcF rlilSaatt on ��� ,.. � .t\ �% �• N/4teeMJ /—....•l� �a { sand, rrtet �•,� �. . . ,\ '(aswd ,�. - 13 w Zh�} ,Fxa fir. .i. -. r( P ^•'�. j,,�1 ?�+ r t!tzl jA} � ',W�•kr. IN{"dddnswY.i A 3xyqyD✓?S`f qt-r.�tl �+s�"r,:ld Pack N..., +n, <qt �471 f"' r,\)/4*LCR4.an 1.�1f,n�I�R'i! 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Figure 1 Regional Setting Map Grapple' 0 1 M. 2 Miles 3 DISCOVERY BAY TREATMENT PLANT EXPANSION EKPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 of 1.3 mgd corresponds to 3,979 housing units, which includes the 3,600 housing units in;the original Discovery Bay development and 379 housing units from the Centex(Albers)development. Currently,sewage from homes in the Discovery Bay and the Centex development is treated at the SD No. 19 WWTP. The facility consists of a bar screen, a communitor, an oxidation ditch,two secondary clarifiers, an ultraviolet disinfection system and a sludge lagoon. The treated effluent is discharged to the Reclamation District 800 drainage canal and then pumped to Old River. Treatment Plant Flows and Loads A. Previous Design Criteria When the WWTP was originally designed,it was assumed that the occupancy factor would be 2.85 persons per dwelling unit(DU) and 115 gallons per capita per day(gpcpd). In addition, influent BOD5I and TSS2 concentrations of 180 mg/L and 210 mg/L, respectively, were assumed. Analyses of recent and historical flow data indicate that the flow assumptions are still valid, however the BODS and TSS concentrations have increased. B. Plant Flows Historically,the Discovery Bay development has consisted of vacation and retirement homes rather than permanent residences. However, the housing trends appear to be changing towards more permanent residences and less vacation homes. If the percent occupancy of homes is less than 100 percent,then the measured flow per DU(using all DUs)is lower than the actual value. It appears the flows per DU that have been documented are lower than the actual flows, due to the higher percentage of vacation homes and the resulting decrease in percent occupancy. Historically,the flow per DU, based on assuming 100 percent occupancy, has increased from 270 gallons per day/DU(gpd/DU)in 1988,to 303 gpd/DU in 1991, to 320 gpd/DU in 1997. It is reasonable to assume that the flow per DU will continue to increase until the existing homes are 100 percent occupied at which pint the flow/DU will stabilize. Based on flow projections, an average flow per DU of 330 gpd/DU, will be used to calculate the flows from the developments.3 This flow is consistent with previous design reports and is used for design purposes. 1 5-day,20°C biochemical oxygen demand. 2 Total suspended solids. 3 A peak factor of 3.0 and 3.1 was used to calculate the peak flows to the treatment plant as used in previous design reports. These values were based on Figure 2.4 of Metcalf&Eddy(2nd Edition). The two peaking factors used in Table 1 are based on the plant influent flow. As flow increases,the peaking factor decreases. The flows presented in the table will be used to size the various unit processes in the treatment plant. These flows will also be used to develop a phased construction plan. 4 EXPANDED INITIAL STUDY DISCOVERY BAY T RRATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN C. Plant Loads For the period of January 1995 through July 1997, the average monthly influent BOD5 concentration to the plant has been increasing over time from the original design criteria of 180 mg/L to 200 mg1L. The average influent TSS concentration has increased from the original design criteria of 210mg/L to 225 mg/L. The peak influent concentrations coincide with the peak flow months, resulting in, an even higher peak seasonal load. The new influent BOD5 and TSS concentrations are assumed to be representative of the current wastewater characteristics. These concentrations are typical of medium strength domestic wastewater.' D. Treatment Plant Capacity The total influent flows the plant from existing and approved(but not yet built)developments are presented in Table 1. The average daily flows include inflow/infiltration into the existing sewage collection system as assumed in previous reports. As the sewage collection is expanded to accommodate the additional growth,it is assumed that inflow/infiltration will increase at the same proportion. In addition,since this is not a combined sewer system(i.e'., collection ofstormwater as well as sanitary flow),no additional contribution of wet weather storm runoff'or lawn watering are included in the plant average daily flow. Assuming that the flow per DU does not change significantly through'the buildout of the development,'the buildout influent''average flow for the plant is projected to be approximately 2.03 mgd. The flows presented in the table were used to size the various unit processes in the treatment plant, and to develop a phased construction plan. In summary, the existing WWTP has a capacity of 1.3 mgd;with buildout of approved projects, a capacity of 2.03 mgd is required. Moreover, cumulative peak flows are projected to increase from 4.15 mgd to 6.09 mgd. Table 1 WASTEWATER FROM EXISTING AND APPROVED PROJECTS SANITATION DISTRICT NO. 19 1',qulvaicn#: No'Of Flow C'o nmerclat DU From Total Total Ct rrud CumuL fills *4 0i nU Plow: Co nrn Flow No.or Flovvteak mgd�?� . tg 3 tgnol EDUs Devfiiop _ ;{n gd) Cto ` .:F1owb Discovery Bay 3,600 1.19 19,800 60 3,660 1.21 1.21 3.1 3.75 Centex 379 0.13 0 0 379 0.13 1.34 3.1 4.15 Discovery Bay West 1,953 0.64, 18,150 55 2,008 0.66 2.0 3.0 6.0 Byron 78 0 0 28,050 85 85 0.03 2.03 3.0 6.09 Total 6017 1.96 66,000 200 6,132 2.03 2.03 1 3.0 6.09 ` Average Day Maximum Month. The flow equals the number of DUs multiplied by the flow per DU. t Based on a peak factor of 3.0 and 3.1. Source: Carollo Engineers(1998). 4 Metcalf&Eddy,Inc.,2nd Edition,wa�erl?ngincadng:T=at=ntJD.6pmLReust. (McGraw-Hill Book Company Publishers). Table 3-5 of this standard reference divides untreated wastewater into three categories: 'strong%'medium'and"weak'. The BOD and TSS concentrations received by the V*IWI''P fall into the medium strength category. 5 DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 4. PREVIOUS EIRs Discovery Bay West EIR The Final EIR was certified by the Contra Costa County Board of Supervisors on July 25, 1995.5 This EIRwas prepared for the General' Plan Amendment, Rezoning, Development Plan and associated subdivision for a 1,089-acre Discovery Bay West(DBW)planning area. The project description includes all annexations,sphere of influence amendments and other entitlements necessary to allow the land to be developed. This includes the annexation of the Discovery Bay West area into Sanitation District No. 19 and the construction of needed collection facilities, including force mains and pumping stations. In this DEIR, sewage collection and treatment is analyzed on pages 4.8-6 and 4.8-7, and pages 4.8-17 through 4.8-18. Specifically, the DEIR summarized a study by Carollo Engineers that recommended connections to and expansion of the existing Sanitation District No. 19 sewage treatment plant. Table 4.8-9 in the DEIR forecasted cumulative flaw at buildout of the Discovery Bay West(DBW)project,along with buildout of the Centex(Albers)and Byron 78 project. The DBW Draft EIR also forecasted cumulative peak wet weather flows. That EIR served as the environmental documentation for a development agreement between the Hofmann Company and DDSD to provide service to the site. Subsequently, DDSD retained Carollo Engineers to prepare a Sewer Conveyance Master Plan and a plan for expansion of the WWTP. In summary, the Discovery Bay West EIR analyzed the policy and jurisdictional aspects of providing wastewater service to the Discovery Bay West Planning Area:.,but at that time the engineering details of the collection and treatment system were not known. Los Vaqueros EIR The Los Vaqueros Draft Stage 2 EIR/EIS was issued in 1992 and certified as adequate by the Contra Costa Water District(CCWD)Board in November, 1992.6 The goal of this project are to improve the quality of water supplied to CCWD customers and minimize seasonal quality changes, providing consumers with the highest quality water practical. To meet these water quality and reliability objectives, CCWD proposed construction of a reservoir in the foothills of the Diablo Range, southwest of Byron. A part of this project involved constructing a water main along the Highway 4 corridor in the Discovery Bay area. Consequently, the geologic, biologic, archaeologic and other research int he Los Vaqueros EIR is generally applicable to any Sanitation District No. 19 facilities that are proposed along the Highway 4 corridor. This includes the 1.8-mile long force main/gravity sewer that is planned within or adjacent to the Highway 4 right-of-way, and any WWTP facilities sited within the 18.6-acre study area. 5 Contra Costa County,Final Environmental Impact Report,Discovery Bay West General Plan Amendment and Related Actions, County File No.4-93-EC,Rezoning 2963-RZ, Development Plan 3025-91, Subdivision 7686,SCH#93033031. s Contra Costa Water District,Final Stage 2 Environmental Impact Report/Environmental Impact Statement for the Los Vaqueros Project,SCH#91063072. 6 EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL I SOS AND SEWER CONVEYANCE MASTER PLAN S. ACRONYMS ADT average daily trips BAAQMD Bay Area Air Quality Management District BOD biochemical oxygen demand CCCSD Central Contra Costa Sanitation District CEQA California Environmental Quality Act CPT Cone Penetration Test CRSNBZ CoastRange-Sierra Nevada Border Zone DBW Discovery Bay West DR Delta Recreation and Resources DU dwelling unit ECCID East Contra Costa Irrigation District FM force main gpcpd gallons per capita per day gpdfDU gallons per day per dwelling unit ICE formerly John Carello Engineers;currently Carollo Engineers MG Mark Group,Inc, mgd million gallons per day msl mean sea level NPDES National Pollutant Discharge Elimination System PS pump station Qhpm Holocene peat and peaty muck RWQCB Regional Water Quality Control Board,Central Valley Region SOPA Society of Professional Archaeology SWPPP Storm Water Pollution Prevention Plan TSS total suspended solids W ultra violet WWTP Wastewater Treatment Plant 6. PROJECT DESCRIPTION Location The SD No. 19 service area is located in eastern Contra Costa County, approximately 2 miles northeast of the historic business district of Byron(see Figure 2). To enhancereadability,the lands in SD No. 19 are shaded,and the DBW project area is labeled. SD No. 19 is bounded on the south by State Route 4 and on the west by Bixler Road. Elevations within the District range from approximately+15 feet to -10 feet. At the date of the last updating of the'USGS map in the tate 1960s,only the northwest portion of the Discovery Bay project had been constructed. Wastewater collection facilities are required within the DBW project, a pressure main and pump station are required along a 1.8-mile long reach of Highway 4(extending from the existing WWTP westward); and wastewater treatment plant expansion is required. The expansion was planned to occur at the existing WWTP site,but expansion south of Highway 4 is also being evaluated. The existing WVVTP is situated in the southeast corner of the Discovery Bay project. Surrounding land uses include single-family residences and golf course to the west and north; open space land to the east; and State Route 4 to the south. Figure 3 presents a 1996 aerial photograph of the Discovery Bay area,which illustrates existing land uses in the area. It also shows the District's 7 3 $rear vIN , p :r asr rvr ww rwrii#ewY>D]{]TiYtl'ictii9nlP'.nii�tw'wYw„iY:i'is" aw awwww wrww aasrr -:::'. a � ! I 15 , r 1 { Viitfag+ ivi^� $ 01IR W a o D5 r a. i Cl j I Ta0ed real 1 ' A. e `ands Within ,k I I San aU6 l District# Vifiag s Iiiage �` f ;-"��., �•� r� .� �� '� ,.� 'ire f���f a Point of Timber Road ? y b ( �1V I is Vilfage4s� 04 )7 7 i � .... .....w . +, �• ; 1 I ' � ti '� zbf'i• Ekisting s : P. High way4 _....... Area.',, ♦,,� it = � s w•� i p � i Pumping Stef �t,+ �`; . x ' 'i Note:This project includes expansion of wastewater treatment facilities,which can occur at either the Existing WWTP site or ...-....-. south of Highway 4 in the Study Area �44 • "r A a Figure 2 US Geological Survey Source:USGS Quadrangle Maps: Graphic Scale: Topographic Map Clifton Court Forebay(1976) Woodward Island(1968) 0 1600' 3000' Brentwood(1978) 8 o W � `✓ �ups>s� � � ' M � N i �pp r r as r)" d aAOQSjQ s ........................................................... ................................................. ............................ ................... DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STEMY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 boundary and the location of the existing WWTP, as well as the location of a 18.6-acre "study area" on the south side of State Route 4. Note that the "study area" is a light-toned area that represents lands that are mowed and continue to be used for agriculture. It is a portion of a 72- acre parcel owned by the Hoffman Company that is being evaluated for placement of WWTP facilities. The east boundary of the WWTP and the west boundary of the"study area!'is a drainage canal. Reclamation District 800 circulates water through Discovery Bay waterways and golf course lakes which then discharge to the drainage canal. Discharge normally flows to the north but it can be shunted to the south Facilities—WWTP Carollo Engineers were retained by DDSD to evaluate wastewater treatment requirements for the proposed expansion of the Discovery Bay WVVTP and to develop a facility plan.7 Their report recommends an oxidation ditch process with a lagoon for sludge treatment;secondary clarifier and lift station;RAS/WAS pump station; increased ultra-violet(UV)capacity; and modified flow splitter box. Carollo Engineers provide four scenarios for placement of the WWTP facilities. Figure 4 presents dim of the layouts. Three of the four scenarios utilize a portion of a 72-acre site owned by the Hofmann Company. That site is located on the south side of Highway 4, immediately southeast of the portion of Discovery Bay that is utilized for a corporation yard and for the existing WWTP. Layout Number 1.-The existing WWTP site has space to accommodate the facilities recommended by Carollo Engineers. Historically, it was anticipated that expansion would occur at the existing WWTP site,and this is the preferred project of DDSD. Figure 4 shows the existing facilities with solid black lines and expansion facilities with a grayed line and the facilities shaded. The sludge lagoon would be segmented into two parts,separated by a baffle. Just east of the sludge lagoon is the site for the new clarifier, the clarifier lift station and RAS/WAS pump station. At the north end of the WWTP,a new oxidation ditch is shown, Lavout Number 2: In this scenario,the existing sludge lagoon at the WWTP is eliminated and a new sludge lagoon constructed on the south side of Highway 4. A new oxidation ditch is positioned in the southeast comer of the WWTP, in the eastern portion of the existing sludge lagoon site(see Figure 4). Pipelines would be extended under Highway 4 to link the sludge lagoon with the WWTP. Carollo Engineers,April 1998,Delia Diablo Sanitation District,Discovery Bay Wastewater Treatment Plant Expansion, Treatment Analysis. 14 �A o o /3 r 0 0 To kflQhwey 4l �$ z : 1,,eVee Hold To Old Weer77 /777777 id if. rxaerrNrrrr,. Od _ tl11ei .«.... _ ®.............. _..r.._ :__._.. Cra I� M s -n —r CD l� ° CA To Old lr a✓ cl tt] i llI n �l a 3; e.S� *tid DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1498 Lavout Number 3: In this scenario all of the new facilities required for the expansion are shown south of Highway 4, except for mains which connect the two sites (see Figure 4). This design is the least efficient to operate because it involves operation of a duplicate facility south of Highway 4. Layout Number 4: This scenario is similar to Layout Number 1, except that all wastewater treatment facilities would be south of Highway 4, in the study area. A graphic representation was not included in the report issued by Carollo Engineers so it could not be portrayed in the Expanded Initial Study. Nevertheless,it represents one of four options evaluated by DDSD. In this alternative the existing WWTP site could be made available for an alternative land use. This alternative has the advantage that it provides potential for an increased buffer zone around the WWTP, but it has the greatest economic costs. Sewer Conveyance Master Plan 1. Design Flows Carollo Engineers were retained by DDSD to develop a plan for integrating the DBW sewage i flows into the existing SD No. 19 sanitary sewer system. The results of their research is presented in their April 1998 report. The following discussion is intended to highlight and summarize key findings and not to supersede the report. Currently sewage within the Discovery Bay community is conveyed to the WWTP,located near the southeast comer of Discovery Bay, via a system of gravity sewers(GS),force mains(FM)and small pump stations(PS). For the purposes of sewer design, DDSD has adopted the Central Contra Costa Sanitary District (CCCSD)guidelines, including: a)design methods; b) minimum slopes of gravity sewers;and c) depth of flow in gravity sewers. Flows calculated using CCCSD's design methods were compared to flows measured at the WWTP. Based on measured flows, an average flow rate of 330 gpd per I DU was calculated. The peak flow rate is estimated from the average flow rate by multiplication of a peaking factor.$ i 2. Conveyance Within Discovery Bgy,West(DIM A preliminary overview of sewage conveyance within the DBW subdivision indicates that sewage could be conveyed within the DBW residential community with four pump stations and a series of gravity sewers and force mains,as shown in Figure 5. A large pump station at the southern end of the development(PS 1)would convey sewage from DBW and surrounding developments to the WWTP through the Discovery Bay sewer system. There are two alternatives for the location of PS 1. In the first alternative,PS 1 would be located within the southeast portion of Village I(see s A peaking factor of 3.0 was used for the main sewer tines in the existing Discovery Bay sewer system. Two different peaking factors were used for DBW, For initial flows from DBW,a peaking factor of 4.0 was used. To evaluate the sewer system when DBW is closer to buildout,the peaking factor was reduced to 3.0. In evaluating the contribution of the Centex units,a peaking factor of 4.0 was used. A peaking factor of$.0 was used in the analysis of the homes on Cherry Hills Drive. 12 DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1999 Layout Number 3: In this scenario all of the new facilities required for the expansion are shown south of Highway 4, except for mains which connect the two sites(see Figure 4). This design is the least efficient to operate because it involves operation of a duplicate facility south of Highway 4. Layout Number 4: This scenario is similar to Layout Number 1, except that all wastewater treatment facilities would be south of Highway 4,in the study area. A graphic representation was not included in the report issued by Carollo Engineers so it could not be portrayed in the Expanded Initial Study. Nevertheless,it represents one of four options evaluated by DDSD. In this alternative the existing WWTP site could be made available for an alternative land use. This alternative has the advantage that it provides potential for an increased buffer zone around the WWTP,but it has the greatest economic costs. Sewer Conveyance Master Plan 1. Design Flows Carollo Engineers were retained by DDSD to develop a plan for integrating the DBW sewage flows into the existing SD No. 19 sanitary sewer system. The results of their research is presented in their April 1998 report. The following discussion is intended to highlight and summarize key findings and not to supersede the report. Currently sewage within the Discovery Bay community is conveyed to the WWTP,located near the southeast corner of Discovery Bay, via a system of gravity sewers(CS), force mains(FM)and small pump stations(PS). For the purposes of sewer design,DDSD has adopted the Central Contra Costa Sanitary District (CCCSD)guidelines, including: a)design methods; b)minimum slopes of gravity sewers; and c) depth of flow in gravity sewers. Flows calculated using CCCSD's design methods were compared to flows measured at the WWTP. Based on measured flows, an average flaw rate of 330 gpd per DU was calculated. The peak flow rate is estimated from the average flow rate by multiplication of a peaking factor.' 2. Conveyance Within Discovery Bay West(DBW) A preliminary overview of sewage conveyance within the DBW subdivision indicates that sewage could be conveyed within the DBW residential community with four pump stations and a series of gravity sewers and force mains,as shown in Figure S. A large pump station at the southern end of the development(PS 1),.vould convey sewage from DBW and surrounding developments to the WWTP through the Discovery Bay sewer system. There are two alternatives for the location of PS 1. In the first alternative,PS 1 would be located within the southeast portion of Village I(see s A peaking factor of 3.0 was used for the main sewer lines in the existing Discovery Bay sewer system. Two different peaking factors were used for DBW. For initial flows from DBW,a peaking factor of 4.0 was used. To evaluate the sewer system when DBW is closer to buildout,the peaking factor was reduced to 3.0. In evaluating the contribution of the Centex units,a peaking factor of 4.0 was used. A peaking factor or 5.0 was used in the analysis of the homes an Cherry Hills Drive. 12 _.. _ DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 Figure 5). In the second alternative,PS 1 would be located in the northwest comer of Discovery Bay, on the site of Water Well Number 4. This location is indicated in Figure 6(top). It should be recognized that the locations of pump stations and other collection facilities shown in Figures 5 through 8 are approximate.The location of collection facilities within DBW will be refined when Final Subdivision Maps are prepared,to be consistent with the design of the residential project, while meeting the requirements of DDSD. 3. Conveyance Modifications Within Existing Discovery Bay The conveyance plan developed by Carollo Engineers utilizes as much of the existing Discovery Bay sewer system as possible. There are pipelines in Discovery Bay which have limited surplus capacity. Carollo has formulated a plan that calls for staged facilities improvements within the existing Discovery Bay community, as well as improvements within the DBW project. The following is a brief summary of planned collection system improvements within the existing Discovery Bay community and along the Highway 4 corridor, based on the collection system improvement proposed by Carollo Engineers. Figure 6(top)identifies collection system improvements required to occupancy of the first unit in DBW. They include the following: a) Demolish existing pump station (PS) "R" in the Newport Drive area of the existing Discovery Bay community, and construction of an 8-inch gravity sewer(GS)to a new pumping station PS-`°1". The purpose of this component of the project is to direct sewage from some Newport Drive DUs to PS "1" b) Construct a pipeline in the Newport Drive right-of-way that will',convey sewage from PS"1"to an existing 6-inch FM. C) Connect an existing 6-inch FM to an existing 8-inch FM. d) Temporarily disconnect an 8-inch FM in Clipper Drive and re-route an 8-inch FM from PS"T'to a new 14-inch FM that extends along the Highway 4 right-of--way and ultimately connects with PS"W"at the WWTP. Note that the 14-inch FM can extend to the WWTP or a GS can be used for part of the run. Figure 6 (bottom) identifies collection system improvements required prier to occupancy of the 251st DU. At this stage an existing 8-inch GS that conveys flows from Village Ito PS "1"is to be abandoned and replaced with an 18-inch GS. When the number of units reaches approximately 277, PS `°2"would be installed in DBW Village I (see Figure 5 for approximate location of this pump station). Figure 7 (top) indicates the collection system improvements required prior to occupancy of the 651 st DU in DBW. At this stage an existing 64nch FM that conveys flows from PS 1 is to be replaced with a 14-inch FM. 14 Sewage Collection Improvements Needed Prior to Occupancy of, Iras-�' {�,---�„GS 651st Unit in DBW Ps-1--vFM = Force Maim l GS =Gravity Sewer PS = Pumping Station hJ; Solid lines denote planned facilities, Greyed tines denote existing facilities REPLACE : 12”GS EXISTING 8"GS 8"FM .a.. W/14"FM £. HEADWORKS PRESTWICK DRIVE •.,, 8"as to J rrp sq ` io"Gs Psi w" t PS"illCLIPPER DRIVE 8--FM da �7 8"MO"GS 8"FM 8 FM y CHERRY HR.LS DRIVE ';, R.J. ........... .................. . . 14"FM� 18"GS , Sewage Collection improvements Needed Prior to Occupancy of 18"GSA';, -8"GS . 1201st Unit in. DB1ill. FM = Force Main GS =Gravity Sewer PS = Pumping Station Solid fines denote planned facilities, Greyed lines denote existing facilities 14'"FM 12"GS as HEADWORKS PRESTWICK t. „4 DRIVE it. 12"GS F WY/YP 10"GS Q MHWi /. : PS illS CLIPPER DRIVE r FM Ila a' .t� RFCCNNNECT, 8"/10"08 DISCONNECT FROM C W RRY HILL&DRIVE EXISTING SEWER 14"FM 18"as ✓ Figure 7 Collection System Improvements Required Prior to Occupancy of 651st Graphic Scale: and 1201st Dwelling Unit �,��"„! Source:CarolIo Engineers(1998) 0 500' 1000' 1500' 16 r EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 19." AND SEWER CONVEYANCE MASTER PLAN Sewage Collection Improvements Needed Prior to Occupancy of 18"GS-/ /- "GS 1501st Unit in DBW FM = Force Main .,...` GS =Gravity Sewer PS =Pumping Station Solid lines denote planned facilities, Greyed lines denote existing facilities 14"FM HEADWORKS PRESTWICK DRIVE p L4 r s� 8"GS m f2"GS MHW4W l WYRP t !._.... 10"GS PS.:'W" PSI.J. o CLIPPER DRIVE REPLACE EXISTING S.FM WITH 11"FM 8"!10"GS S"FM CHERRY HILLS DRIVE 1$"FM „,.. t8"Gs . Figure 8 Collection System Improvements Required Prior to Occupancy of 1501st Dwelling Unit Graphic Scale: Source:Carollo Engineers(1998) 0 500' 1000, 1500, Figure 7(bottom)shows the next phase of expansion of the collection system. Prior to occupancy of the 1,201st DU, the Master Plan calls for disconnecting from the existing sewer that conveys sewage from PS J to the 14-inch FM in the Highway 4 right-of-way and reconnecting an 8-inch FM in Clipper Hill Drive. The effect of these improvements is to allow the existing (pre-DBW) collection system to carry flows generated by the existing collection system, and to allow the DBW sewage flows to be directed to the 14-inch FM in Highway 4 right-of-way. Figure 8 indicates the collection system improvements required prior to occupancy of the 1,501st DU. At this stage an existing 8-inch FM is replaced with a 14-inch FM. 17 DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AM SEWER CONVEYANCE MASTER PLAN APRIL}998 7. PERMITS National Pollutant Discharge Elimination Permit The WVtWTP operates under permit orders issued by the California Regional Water Quality Control Board,Central Valley Region(RWQCB).The National pollutant Discharge Elimination System (NPDES) Permit No. CA0078590 establishes effluent requirements for waste discharge to Old River.Currently,the effluent quality must meet a limit of 20 milligrams per liter(mg/L)for BODS and 30 mg/L for TSS. The WWTP has consistently met discharge permit requirements since the completion of the 1987 upgrade project. Prior to startup,the expanded plant will need to procure a new NPDESpermit due to the increased discharge. In order to obtain a new permit, DDSD will need to submit an NPDES permit application to the RWQCB. The permitting process takes approximately six months to complete. Some water quality testing has been authorized by the District as an initial step in the permitting process.g In order to initiate final,design activities, the District will need to obtain draft permit limits from the RWQCB. Additional analyses are required to support the permit application. These analyses are required in order to demonstrate that the increase in plant discharge will not impact the water quality in the Reclamation District 800 canal or Old River. The required analyses, as documented in the Carollo letter, dated January 9, 1998,are as follows: 1. The WWTP effluent will need to be analyzed for the constituents listed in the proposed California Toxics Rule. 2. The DDSD will need to perform a three-species'chronic toxicity bioassay on the effluent in order to address toxicity issues. 3. The DDSD should perform a 96-hour bioassay utilizing fathead minnows (Larvae, 1 to 14 days old), to verify that the facility's bioassay results pass the new NPDES permit requirements. This test must comply with current EPA protocols. 4. In addition,based on the preceding analyses, the DDSD may need to test the background water quality in the drainage canal to determine the potential for degradation of its water quality. 9 DDSD authorized Pacific Eco-rusk Labs to perform the bioassay required for the NPDES permit.The results of this study are presented in Appendix A,along with a memorandum from DDSD that provides background information on water quality testing. 18 I'll,.......................I..................................................................I--........ ............................................................. ........... ............ ........................................................... . EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN Air Permit The facility has an existing air permit from the Bay Area Air Quality Management District (BAAQMD)for facility air en-tissions. The facility will have to obtain an authority to construct prior to beginning construction of the plant expansion. Upon completion of construction, the BAAQMD would issue a permit to operate the facility. CalTrans It is anticipated that the project will require construction of a force main/gravity sewer in the Highway 4 right-of-way prior to occupancy of the first unit in DBW. This will require permits from CalTrans. Additionally,if WWTP facilities are constructed on the south side of Highway 4, an encroachment easement/pipeline easement will be required from CalTrans. 8. CONTRA COSTA COUNTY ENVIRONMENTAL CHECKLIST FORM(INITIAL STUDY) 1. Background 1. Name of Proponent: Contra Costa County Sanitation District No. 19 2. Address and Phone Number of Proponent: Contra Costa County Sanitation District No. 19 c/o Delta Diablo Sanitation District 2500 Pittsburg-Antioch Highway Antioch, CA 94509 (925) 778-4040 3. Date Checklist Submitted: 21 April 1998 4. Name of Proposal: Discovery Bay Treatment Plant Expansion and Sewer Conveyance Master Plan Discovery Bay Area, Contra Costa County 5. Special Circumstances: Expansion of the District's existing WWTP and collection system is needed to serve lands that are currently within the District. 19 ................... DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAI.STUDY AND sEwER CONVEYANCE MASTER PLANAPRIL 2998 II. Environmental impacts Quad Sheet: Woodward Island/Clifton Court Forebay Date of Site Visit:'17 March 1998 S 1 1. Earth. Could the proposal resat in: a. Unstable earth conditions or in changes in geologic substructures? — X The eastern one flflh of Contra Costa County is situated on the west side of the Sart Joaquin Valley. The nearest bedrock outcrops to the site are approximately':3 miles to the southwest 1n general, the(.quaternary deposits in the eastern portion of the County consist of a combination of eolian dune and river delta deposits. The most recent mapping of Quaternary deposits in Contra Costa County is the mapping>of the US. Geological Survey(Kelley and Graymer, 1997). To enhance readability the USGS mapping has been enlarged to a scale of I``'=2,600'(see Rgure 9). This map indicates the site of the WWTP, along with 18.6- acre "study area"being evaluated for possible use of treatment plant facilities are within an area mapped as Holocene peat and peaty muck (Qhprn). These are water saturated peat and mud deposits in tidal wetlands that were deposited in response to the post.-Wisconsin rise in sea level. They are time equivalents of the Bay Mud, and they are found only in the eastern section of County. The unit consists in large part of the decomposed remains of roots and rhizome, particularly scirpus acutus(tole), Pharagmites australis (common reed),Distichlis spicuta("salt grass)and 7, pha slatifolia(cattail). The WWTP was constructed in the late 1960s. The grading of the WtVTP site was monitored by a geotechnical engineer to document that site preparation work was in accordance with the provisions of the geotechnical report. The plant area is sized to accommodate the treatment,l'aclities needed to serve all properties within Sanitation District No. 19, including the expansion that was triggered by approval ofDBW by the County Board of Supervisors, Conversely, the "study area"has not been graded. According to the USGS map, the sediments are at least in part organic and the water table is shallow. An evaluation offoundation conditions south of Highway 4 is provided by a reconnaissance-level geotechnical investigation performed by JH.' Kleinfelder&Associates(K'lelnfelder). The report may be identified as follows: S = Significant I = Insignificant 20 ... ,. � •' ti w � :.Jc° _' x.N� Yy r +k>.. moi• of Artificial Fill(Mapped only in Discovery Bay Area) _ �" ` r i t ••� • r'a '[ ©hpm Peat and peaty muck . (Holocene) `. -=°sNjx .IC :two'+ ,ST`4 s'tf°d+wX � _ rr ..ky„1: r � M,�°��+:;•vr x �i7 rfJ"t''�Id ;'�' Ohl Natural Levee deposits -� ' x,ate �� ,t fiy •; -� r , . ' (Holocene) - t�1a�.w i ia, y s;pr's E a s Y» #Filri °Zx4✓n r r=f 1• i, xs 2 r e:'r..� � � I w y � �/'t,�. s s`�,s y" ♦ t x r �`: �+ Ohb Basin deposits '�$` f.!✓' T,i x hr��k. .°^ . �,. r �=t F� -" 3'` .�, ;. .�w t*gT"'�: r'.�.+i.. esa.:.1xfir, (Holocene) "� �``�'':';aVF x.� JL4'. ;sFx .stY{s+ lr�y' +t `STJ x Qpaf Alluvial fan and fluvial deposits(Pleistocene) - :.,. SRI ^°�ir'w�ti•s+`r e 7JT +y'.• s :-c.�' .�.«,. ' br bedrock ri 1• y F '�1. .r/.,"s '4"&'i`-�.,w tL# lid =JtA �5-'°" 'e':� :Y' YX s, � < ✓r^ ,.•t",a a#r 3 �rt ., �' i� {e�Xy i �, Tt � yw� °Z'� z +. *•'li,a.,,+txsyr� z ��`rj,^,r �iiY " - + 03�t,t s .y-{!. wt .G��'i K ryr-�M.• �, .._'�y'71t4"t *°�� {. � •. � _ ;z °ew" d4* ti 7At7♦r#�i t.�Y� +' Rw �!r° ,.4 �r/ r., � ] (/ 1��.... : i � T�� e1Fr"e b• e`! r:`" `✓y�'„*rx ¢'�4 rt t=.f• 7 -.. r 'k. sa ,•+' t., t 'ti'-+... � t � r �• r,.f `r s'r i r >':�y._' rr .x tiP , �if.�+, r+ r*"!t FX F:,� +i� ��•'�y-..� �:.��.t i «',: r � h + t. �.t rr„r T } sJt y. t, ti �► � J �y, . z p, � 'i r, / "5 r �- � r St r t.- 'q•'`y �t -T,.� sR rr*.t�`.,,.°: � agy r,,, S ;�y. V _ ,, .,ice 3 _ `._ 1 J.�•l,tr� y,i i I;.t�10 yL�"1 Lt -. 5 t "�• - ..ria f /> : > fir *,> ^` 5f4.r 'tt n{ [¢! +.t s t + :. "# + t. y/�.,r a °z.. ` - S _> > t�} IW� '+"t.'J,l.•.P'r ,^. s; T rr,� .,.' 'r^^";... ......,r,.r ♦. °�t., r,,, 7 z •l--s 'r < t, it: ^` f ,vt_ -I 1 f Y. - l 6 - ` L K .,.,s t >3 XY r.L- i° ''� r i. s +•�s.. 4% ZI I. �,.:'J�! '-3�' !i r r ^tw" ro 1.�ti 1>:, N 4 )/fi µ-S f+.t Y +C' lyyj T1i •r l rr se 3 ° 'glr. iy L,. #, 'wyr"`'«.•.r-.• °".'y Y- '�✓ #r'T� 'lc•s.� � .y iii r :a � S n !� �lr�y. �''"@� )S _ zz �1 y ti�AYp i x T° d r ,t T f.ra r-�n t fit✓ a �t xr.�°MaS t o 7�'t x'r•3e d r . : + \ s . x„i J .-"r .- ,', `,q, <t ✓ y',r ..,{ Y'^?' fi 0rzr �y �.'>y' +,t r Mgy,+fe r•� .- t' rt.ca^r.t^ dt i, ;:sa` *' 1. x w� V VY■t A ,aa r` �.x -'� r;� iY ;str •ice py,.- F,. w-s°���* ✓. f F7` fr�'T t at Y� /y��.lyyy��` , t `��+�• a•" .c Zz'at+' ��• .°�."= i�>j'.' rt°° l ?�,.' vA>u �\/i�rLi��,. f A °1y.�,� ,/ ��..r h{i .'R� ' ')} ,tet• � ��!L J ~ 'M 43.Y�ti ly � f f t t hk Figure 9 Quaternary System Deposits Map Graphic Scale. Source:Helley&Graymer,1997 0 1500, 3000, 21 DISCOVERY BAY TREATbAENT PLANT EXPANSION. EXPANDED TNI1TFA1.STCTI7Y AND SEWER CONVEYANCE,MASTER PLAN APRIL 1998 S Reconnaissance Level Study Proposed Development South of Highway 4 Byron Tract, Contra Costa County Kleinfelder File#5-1437-21 (Report dated January 23, 1986) As previously noted, the Contra Costa Winter District constructed a pipeline across the study area that pumps surface waters of Old River to the Los Vaqueros Reservoir. The design work, or that pipeline included a geotechnical and geologic study of the pipeline corridor by the Mark Group,Inc. (MG). The report is titled as follows: GeologiclGeotechnical Investigation Old River Pipeline Project Contra Costa County, California (MG File# 90-1148006 8C, report dated Sept. 4, 1992) Figure 10 is a;Subsurface Exploration Map that shows the location of the.subsurface data points of both Klein,felder and the Mark Group, Inc. These reports have been reviewed for the Initial Study by Darwin Myers, CEG. Mr.Myers has concluded that these reports, taken together,provide an adequate basis for making preliminary conclusions about subsurface conditions in the study area. The principal findings of these investigations may be summarized as follows: • The "study area"is underlain by unconsolidated,moderately,to poorly sorted silt and clay rich in organic material. Locally the organic remains at the surface are peaty. However,peaty material is less than S feet thick, • The fine-grained sediments at the surface were deposited from standingfloodwaters thatperiodically inundate low interflluvial basin areas and locally form seasonal fresh-water marshes. The rules in such marsh areas locally resulted information of peaty much Levees and agricultural operations have disrupted this natural process. The agricultural soils developed on these deposits provided good to fair farming ifwell drained. • The potential geologic hazards and problems south of Highway 4 include expansive soils, low shear strength of saturated soils, high seasonal water content, and potential for liquefiable loose sand beds at depth: S = Significant I = Insignificant 22 tl0)f to X{"U M 0Od O� mo O ELu� XRT Cho y k� 2 cr 00 CL z 060,0 0 Z5 ,a�—.� -6 C� J N J�2 •� fy .� a k� c7 � M �R '� Es ib E s a�irn rn tw m� `myc X K� D-a) 03(M A , � ° 25m Qa air• v o zv ai o a. ami o a M.z OE tan) ami�3p o �wc o°c'c oc o.,. o (� C C y C--lU. C'Gp C 0 Q� :� ��Y tem (DM Ll T— N N T. 1 137 �-- s�• - .' v.�.+a,:>,.. � Cid ° f & Fa C3, mom ` qv' a. . w x V 6, jr s s� x rw I�'il i i {j 4 $g R�c 23 DiscovERY BAY TREATMENT PLANT EXPANWON EXPANDED IMTIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 S I • Soil conditions south ofHighway 4 are similar to those in adjacent portions of.Discovery Bay. Thus, the existing WWTP has subsurface conditions that erre similar to those at the study area. b. Disruptions,displacements,compaction or over-covering of the soil? --- X As Figure 2 indicates, the elevations of existing ground in the Sanitation District No. 19 range from +15 to-I0 feet(mean sea level datum). Similarly, the lands along the south side of the Highway 4 and the terrain within the "study area"is nearly level. Consequently, the amount ofgrading required to construct SD No. 19 facilities is not significant A design-level geotechnical report will be needed to provide standards and criteria to guide grading, drainage and foundation design. c. Change in topography or ground surface relief features? .._ X See response f.b. d. The destruction, covering or modification of any unique geologic or physical features? ._ X See response 1.b. e. Any increase in wind or water erosion of soils, either on or off'the site? X _. The grading for collection facilities was considered by the D}BW EIR, and earthwork within the existing WWTP is a controlled environment, where sediment can he trapped and prevented from exiting the site. Therefore, the primary area where potential for wind or water erosion to occur is limited to the facilities placed in the "study area"south of Highway 4. Erosion mid Sedimentation Impact. The earthwork necessary for construction of WWTP facilities in the study area possesses an erosion hazard. Earthwork will be required to create an cell-weather service road, as well as constructing wastewater treatment facilities. Figure 4 shows various scenarios for improvements south of Highway 4. The layout selected will affect the extent of the graded area. However, the worst case scenario is for disturbance of up to 9 acres of the 18.6-acre study area. Relocation of the sludge lagoon alone would require disturbance of an estimated 5 acres for the facility, including laydown areas, and 1 acre for the service road. S = Significant I - Insignificant 24 .................................................................................................................................. ........................................................................................... ....... ........................................................-.... . , EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAuN S Mitigation: For work areas south of Highway 4, the flat slopes and distance to the canal and Highway 4 ditch will mitigate some of the erosionlsedimentation problem, because this intervening agricultural field provides the opportunity to trap sediment. Additional mitigation measures are as follows: i. All grading, excavation and filling shall be conducted during the dry season (April 15 through October 15) only, and all areas of exposed soils shall be replanted to minimize erosion and subsequent sedimentation. After October 15th, only erosion control work shall be allowed ii. A sediment and soil erosion control plan shall be prepared prior to commencement of construction. The plan shall show the location of proposed temporary detention basins, silt fences and straw bales, along with revegetation of all graded areas. It shall also contain provisions for: 1) Performing maintenance during the winter rainy season, as necessary. 2) Regular inspections by the project engineer during the winter rainy season. 3) Spot inspections duringlimmediatelyfollowing severe storms. f. Changes in deposition or erosion of beach sands, or changes in siltation, deposition or erosion which may modify the channel of a river or stream or the bed of the ocean or any bay,inlet or lake? X There are no nearby stream channels. The collection facilities within the DB Wproject, and measures to control erosion were incorporated into the DBW EIR. Other pipelines will be installed in the existing Discovery Bay community. For the most part the mains are in street rights-of-way. This setting allows trenches to be opened, closed and repaved. The job is completed with street sweeping. Consequently, the risk of impacting a creek is nil. Construction of WWTP facilities in the existing WWTP site affords a controlled environment where risk of impacting a creek is nil. S = Significant I = Insignificant 25 ....................... DISCOVERY BAY TREATWNT PLANT EXPANSION EXPANDED INITIAL STUDY ANIS SEWER CONVEYANCE MAS'T'ER.PLAN APRIL 1998 S I With regard to the "study area"and mains in the Highway 4 right-of- way, ight--ofway, the ground is nearly level. It is anticipated that facilities would be set back 140,feet or mare from the drainage canal and Highway 4 roadside ditch. The intervening level agricultural field provides an opportunity to trap sediment. Moreover, the access road to any WWTP facilities south of Highway 4 would be rocked or paved to provide all-weather access and this would control erosion along the service road. Furthermore, NP.DES requirements would result in preparation of a.Storm Water Pollution Prevention Plan (SWPPP) if the disturbed area is over 5 acres. The SWPPP is intended to control short-term, construction-related erosion. Over the long term, the increased discharge from the WW.TP will not create a sedimentation problem in the Reclamation District 800 Canal, The NPDES permit requirements keep discharge of suspended solids to a less-than-significant level. g. Exposure of people or property to geologic hazard such as earthquakes, landslides, mudslides,,ground failure, or similar hazards? X There are no Alquist-Priolo Earthquake Fault Zones in the East County area, so the risk of surfacefault rupture is nil. However, there is a potential seismic source in the Byron area, but one which does not present a risk of surface fault rupture. Specifically, the Coast Range- Sierra Nevada Border Zone (CRSNBZ)approximately coincides with the west edge of the Sacramento.-San Joaquin Valley. This zone is generally considered to be a blind thrust,fault that has a relatively long recurrence interval and has the potential to generate earthquake orf magnitude 6.5±.. The most recent strong earthquake on this system was the 1983 Coalinga Earthquake (magnitude 6.7). Although this event did not result in surface fault rupture, it did trigger strong shaking and produced considerable damage (and injuries) in the epicentral area. The precise location of this tectonic zone is not accurately known for the segment that traverses Contra Costa County. :However difficult it may be to quantify this risk, there appears to be potential for strong groundshaking in the Byron area. Specific comments on geologic hazards are as follows: • Sur ace Fault Rupture. The potential for fault rupture on the site can be considered to be low because there are no Alquist-Priolo faults in the Byron area. S = Significant I = Insignificant 26 ................................................................................................................................- ..................................... EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S I • Groundshaking, Groundshaking is the predominant seismic hazard on the project site. According to Wakaboyashi and Smith (1994), the recurrence interval for a Coalinga-type event ranges from 200 to 2,000 years. Based on the attenuation relationship developed by Boore et al. (1993), a maximum probable magnitude of 6.7 on the CRSNBZ would produce peak ground accelerations of 0.42 g's in the Discovery Bay area. • Liquefaction Potential. The County General Plan includes a liquefaction potential map that divides the County into three categories: "'generally high". "moderate to low"and"generally low". When construction is proposed in the "generally high" category, a rigorous investigation is routinely required,- in the "moderate to low"category, geotechnical reports must address liquefaction but the scope ofthe investigation may be less comprehensive. The existing WWTP site, along with the study area is in "generally high"category. Liquefaction .impact:An earthquake on the Coast Range-Sierra Nevada Border Zone will produce the greatest earthquake effects in the Discovery Bay area. The DBWEIR describes these effects as Modified Mercalli intensities of VIII to IX and peak ground accelerations of tip to 0.42 g, depending on the magnitude of the earthquake and other earthquake parameters. The Kleinfelder and Mark Group investigations were not intended to evaluate liquefaction potential ofspectfrc building sites within the area south of Highway 4. Nevertheless, the data suggests that sediments within 15feet of the surface are clayey. Hence, these may be considered a non-liquefiable cap that will separate WWTP facilities from sandy silts and silty,fine-grained sands that may occur at depth. According to the Mark Group, settlement due to liquefaction is anticipated to rangefrom 0.3 to 3 inches for the CCWD pipeline, depending on subsurface conditions at specific locations. However, the details of subsurface conditions must be known for WWTP facilities in the study area to forecast settlement with any degree of certainty. S = Significant I = Insignificant 27 ........................ DISCOVERY BAY TREAT'MLNT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 S I Mitigation:Prior to installation of any ITP facilities south of Highway 4, the DDSD should authorize preparation of a preliminary geology, soil and foundation report c�,f'the area(s)' where facilities are planned. The report should evaluate geologic, seismic and geotechnical hazards and provide specific criteria to guide grading, drainage and foundation design. Improvement and grading plans shall carry out the recommendations of the approved pro jest. This report shall include evaluation of the potential for liquefaction,seismic settlement, and other types of seismically-induced ground failure by recognized methods appropriate to soil conditions discovered during subsurface exploration. 2. Air. Could the proposal result in: a. Substantial air emissions or deterioration of ambient air quality? X The proposed project will increase the capacity of the WJfTP`from 1 3 mgd to an estimated 2.03 mgd This represents a 60 percent increase in the capacity of the plant. The technology of the plant processes is not to be changed, however, not all o,f`the odor producing facilities will increase by this 60 percent factor, so it is reasonable to infer that the emissions will increase somewhat less than the overall capacity. The WWTP has an existing BAAQMD permit, and the plant expansion will also require permitting by BAAQMD. However, compliance with BAAQMD permit requirement does not imply that from time-to-time emissions will not be annoying to property owners on the periphery of the WWTP. According to BAAQMD records,public complaints were received on five occasions during the 7.5-year period August], 1990 through March 22, 1998. These were complaints about odors which were variously described as "rancid", "bad"and "sewage".1° In addition to these five occasions that BAAQMD received complaints, there undoubtedly were other occasions when neighboring property owners directly contacted DDSD(or when odors interfered with use of rear yard areas by neighboring property owners but no complaint was filed). 10 only one of the five complaints were confirmed by BAAQMD staff and found to be attributable to the WWTP. No violation notices were sent to DDSD. S = Significant I = Insignificant 28 ......................................................................................................... ....... ............................................................................ EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN - S As Figure 11 indicates, all or portions of three residential dwellings are within 400 feet of the WWTP jacilities and approximately 40 residential dwellings are located within 600 feet of the treatment facilities of the existing WWTP. While it is not known precisely which properties experience odor-related problems, the parcels within 600 feet are considered potential candidates. Odors Impact: Expansion of the treatment plant on the existing WWTP site will result in an increase in odors. The magnitude of this effect is difficult to quantify, but is estimated to be less than the 60 percent increase in emissions. Expansion of the WWTP on the existing site has potential to cause more frequent and more intense odor problems and to expand the number of lots that are impacted by odors. The tee, fairway and green for one of the golf course holes is within 600 feet of the WWTP facilities,'so the plant also has the potential to effect the quality of the recreational experience of persons using the golf course, as well as impacting 40 homeowners(or more). Odor increases cannot be trivialized or ignored. It is a cumulative environmental effect that is considered significant in the light of the existing odor problem. It should be noted that odors within treatment plants occur from several varied sources. Emissionsfrom headworks can tend to have a sharp, bitter, or rancid odor. These odors are generally localized and can be minimized by scrubbing the air within the headworks itsetf. The treatmentplant headworks was recently retrofitted with a scrubber unit which should minimize these emissions. Odors associated with sludge lagoon can vary from a fairly light "earthy"odor to the rancid "rotten egg"odors often identified with treatment plants or sewers. The main contributing factor to these odors is a lack of oxygen. When sludge is digested anaerobically (without oxygen), the result is often a hydrogen sulphide smell similar to that generally associated with tidal mudflats. These odors are often mitigated within treatment plants by maintaining a well mixed and aerated zone on top of the sludge lagoon. Until recently, the sludge lagoon at the treatment plant was nearly filled with sludge, making it difficult to maintain an aerated zone on top of the lagoon. In December 1997, 1.2 million gallons of sludge in the lagoon was removed This has resulted in an improved ability to develop an aerated zone, which should minimize the occurrence of the more offensive odors. Sludge lagoons are not generally covered due to the high cost of covering and scrubbing air from such large areas. S = Significant I = Insignificant 29 ..................... ......................... .......................... .............. •r. ♦� y y j # "o,rx f x : � t A.x sf 1 a D Key to Views (See Figures 12& 13) Figure 11 Land Use Map Graphic Scale. WWTP and Study Area Vicinity Source.Pacific Aerial Surveys-8/14/96 photo U 2011' 40 30 .................................................................................................................................— ............................................................... EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S- Odors fir-OM the aerated processes(such as the oxidation ditch) tend to be a moist, }`musty"or "earthy"odor. These processes are not as likely to become "upset"resulting in some of the more objectionable odors. These odors are not generally as objectionable to most people as the rotten egg odors(i.e., hydrogen sulphide): Oxidation ditches are also not generally covered due to the high cost of covering and scrubbing air from such large areas. In summary, mitigation at the headworks and sludge lagoons can minimize but not eliminate the emission of objectionable odors, while oxidation ditches are generally not mitigated. The worst odors are generally from the headworks (which has already been mitigated)and the sludge lagoon. Mitigation The expansion should be accomplished in,a manner that will not increase odor problems to nearby residential properties. 77 is objection cannot be accomplished by Layout#I which places all of the new facilities on the existing WWTP(see F7gure 4). Layouts#2, 43 and#4 are capable of mitigating odor impacts. Specifically,Layout #2 shows the Sludge Lagoon south of Highway 4, within the study area. (Figure 11 shows an oval near the center of the study area that represents a potential location for the Sludge Lagoon that is approximately 920feet from the nearestresidence in Discovery Bay.) b. The creation of objectionable odors? X See Response 2.a. c. Alteration of air movement,moisture, or temperature,or any change in climate,either locally or regionally? - X The project is too small to inj7uence the climate. 3. Water. Could the proposal result in: a. Changes in currents, or the course of direction of water movements, in either marine or freshwaters? X The study area is located on the, oor of the San Joaquin Valley,far from creek channels. Runofffrom the 18.6-acre study area drains to the east, toward Old River. The direction of drainage will not change. b. Changes in absorption rates, drainage patterns,or the rate and amount of surface runoff? X S = Significant I = Insignificant 31 da ........................................................ ........................................................ DISCOVERY BAY TREATMENT PLAINT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLANA APRIL 1998 S I The DBW EIR analyzed drainage effects of that development. The construction of WW7P facilities will not have a significant effect on absorption rates, drainage patterns, or the total volume ofrunoff:' c. Alterations to the course of flow or flood waters? X See Response 3.b. d. Change in amount of surface water in any water body? _ X Effluent exiting the WWTP is expected to increase by 60 percent. .however, it meets all current water quality requirements of the RWQCB, and is a small percentage of the surface waters carried by the Reclamation District 8010 canal. The canal water in turn is diluted by the waters of the Old River. A 1992 Technical Memorandum issued by CCWD"provides a summary of available information on the hydrology of the canal and mixing of canal waters with the surface waters of Old River. Briefly summarized, the canal has a pumped capacity of 50 cubic feet per second(cfs), and an annual average of 4,000 acre feet(approximately 3.6 mgd). Effluent quality of water exiting the WWTP is deemed to be superior to agricultural drainage water in terms of trihalomethane formation potential, a key indicator of the suitability of raw Delta surface water for drinking water purposes. Other findings of the CCWD memorandum are as follows • The lowest reported northern flow in Old River(from canal outfall toward Los Vaqueros intake)occurs during high water export situations, which occurs once each day. • tinder modeled conditions of Old River flow(0.S feet/second), adequate mixing in terms of raw water quality occurred within 1.20 feet of the canal outfall point. It should also be recognized that if the Reclamation District 800 canal discharge point is required to be relocated as a direct result of application of drinking water standards to CCWD's Old River facility, CCWD has agreed to accept financial responsibility for the relocation.12 !1 Technical Memorandum CCN 18642, from William Blackmer to John Gregg;Subj.:Agricultural and Wastewater Discharges to the Old River intake. 12 CCWD,August 18, 1993,Agenda Docket Form,Los Vaqueros Project-Permit Agreement with RD 800 for Construction of the Old River Facility and Pipeline. S = Significant I = Insignificant 32 ...__... ......_.. ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ........_............. _ ......... ......... ........ .. EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT ENPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S ] e. Discharge into surface waters,or in any alteration of surface water quality,including but not limited to temperature, dissolved oxygen or turbidity? X The effluent exiting the WWTP currently is discharged into the Reclamation District 800 canal, located just east of the WWTP site. Over the history of the plant, water quality testing has been performed Moreover, during 1998 biologic testing was performed, which involved monitoring survival of algae, crustaceans and minnows in effluent.r3 The discharge from the plant has consistently been found to meet or exceed water quality standards for this project. When the WWTP expansion is completed and DRW is built out, the volume of effluent will increase by approximately 60 percent. There is no evidence that degradation of water quality in the canal would result from the increased discharge.> The beneficial uses of the canal may be summarized as follows: For nearly 30 years Reclamation District 800 has circulated water through Discovery Bay waterways and lakes, which then discharges into the canal, Additionally, the canal. a)receives treated effluent from the WWTP; b)serves to control the elevation of the water table; and c) receives runofffrom the adjacent agricultural lands. It also has incidental, limited wildlife habitat value, and serves as visual open space. however, the canal is chiefly a hydraulic facility, and Reclamation District 800 has authority to dredge and clean the canal from the WWTP discharge to its outfall point into Old River. It is not used for active recreation (i.e., there is no documentation offishing or aquatic activities by the general public.) 13 In response to a request of the Central Valley Regional Water Quality Control Board,made December 2, 1997,DDSD undertook three species chronic toxicity bioassay on the effluent to address toxicity issues,using EPA testing protocols. The results of the water quality studies are presented in Appendix A. S = Significant I = Insignificant" 33 DISCOVERY BAY TREATMENT PLAINT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE:hIAS FRRPLAiY APRIL 1996 S � To provide further documentation of canal and its relationship to the existing WWTP and the study area,photographs documenting existing conditions erre presented in Figures 12 and 13 (see Figure 11 for a key to views). View A shows the reach of the`canal just east o,f`the WWTP. This view is looking north and shows the natural vegetation that is established on the west;facing embankment. on the left side of Photograph A is the service road that provides access to the WW P. The trees are maturewillows. and there is an understory of toles and annual'grasses. View B shows the outfall oftreated effluent into the canal. The water is clear, oxygenated, and the outfall appears healthy. Views C and D are photographs of the study area. View C indicates that the study area is crossed by a'high pressure pipeline that carries water from Old River to the new Los Vaqueros dam, operated by the Contra Costa Water District The pipeline is just south'of Highway 4, View D'is looping northeast across the study area from its southwest corner.' This view shows the canal in the foreground, with eroding banks that are 6 to 9 feet high(estimate). The vehicles in the background are traveling east on Highway 4- f Alteration of the direction or rate of flow of greundwaters? X The WWTP and the Sewer Conveyance Master Plan do not create'a demand for groundwater or alter its direction or rate of flow. The demand for groundwater was created by approval of the LBW project, and the EIRfor that project evaluated groundwater demand and the effect on the aquifer_ g. Change in the quantity of groundwaters, either through direct additions or withdrawals,or through interception of an aquifer by cuts or excavations? The soil within the 18.6-acre study area is clayey, resulting in a perched water table during the winter rainy season. Groundwater for Discovery Bay and DBW is produced from a deep aquifer within .Pleistocene fluvial deposits. The Sanitation District No. 19 improvements are expected to have no quantifiable effect on the elevation o,f`tete water table in the deep aquifer or on water quality. It should also be recognized that nearby agricultural operations utilize surface'waters for irrigation (not groundwater). S' Significant I - Insignificant 34 .... ........ ......... ......... ......... ......... ......... ......... ......... _...... ......... ......... ......... ......... ......... ......... ....._.. ......... ......... ......... . .__ r ; Qr q• b yy t^3 �S* Nig >c r y 3 Figure 12 View AView B Outfall of WWTP Reclamation District 800 effluent into Reclamation Views A&B Canal opposite WWTP District Canal See Figure I I for Key to Views Source:DDSD MINEb k. 35 11 ........ . ......... ......... ......... ........_...._........ ...........__.....__. ......... ......... ...__.... ........... ......... ......... ......... ............_.... . _ _. . .......__........_._..... ......_.. ......... i fy1 111 s x � I Y> II off . ci ,f 1 II �I LD I -st1 cts._ rr,,rr� u .�,.... . > Y" Nxgl z r00 bo. C)� ONOR i h Y ` I 11� x II I III it t� I I, C C .k ti W a , �r P { I I ; AN c h.v � Cyt, ' > ., I {` Y4 I 1119 I����I Dill #� I � k 3 i I I I 36 .11 .............I... .1111,................................................................................................................................................................................................................. . ......................................... ........................I..................... EXPANDED INITIAL STLMY DISCOVERY BAY TREATIVENTPLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S h. Substantial reduction in the amount of water otherwise available for public water supplies? X See response 3.g. L Exposure of people or property to water-related hazards such as flooding or tidal waves? - X The project will not affect flood hazards to residences in Discovery Bay, all ofwhich are in Zone B. Additionally, the existing WWTP and the study area are in Zone B, which is defined as aflood event that is rarer than the 100-yearflood In Zone B,flood factors'have not been determined by FEM4. The County does not require afloodplain permit for projects in Zone B. 4. Plant Life. Could the proposal result in: a. Change in the diversity of species,or number of any species of plants(including trees, shrubs, grass, crops,and aquatic plants)? X With regard to the collection system, the DBW Draft EIR evaluated the effect of that project on plants. Wetlandplants were identified in the eastern portion of the DB Wproject,and that area is to be retained as open space. The WWTP, along with collection facilities in the Discovery Bay development and collectionfacilities along Highway 4 are areas of urban and ruderal vegetation. The 72-acre parcel south ofHighway 4, including the 18.6-acre "study area"has been farmed to a variety of crops over the last several decades. The predominant crop has been corn; however, wheat, safflower, and milo have also been planted Overthelastfew years, the parcel has been left fallow This year it is anticipated by the property owners (New Discovery, Inc)that the parcel will be farmed to corn. The parcel has participated in the USDA.farm subsidy program for several years (farm #1607, Tract#60912). As such, it had to receive a determination that it was not a wetland This determination was completed by the USDA on 1119187. b. Reduction of the numbers of any unique,rare or endangered species of plants? X Because the study area is within a farmed agricultural field, the potential for sensitive plant species is considered nil. S> = Significant I Insignificant 37 ............... ...................................... _.... _. _ _. DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 2948 S I c. Introduction of new species of plants into an area,or in a barrier to the normal replenishment of existing species? X The proposed project does not have a landscape component. d. Reduction in acreage of any agricultural crop? _ X The 18.6-acre study area is underlain by non prime agricultural soils. As noted in 4.a., the study area has been utilized for corn,wheat, safflower, and mild. The loss of an estimated 6 acres of non-prime agricultural soilsisa minor, cumulative impact of the pending project. 5. Animal Life. Could the proposal result in: a. Change in diversity of species,or numbers of any species of animals(birds,land animals including reptiles,fish and shellfish, benthic organisms or insects)? X The B`W EIRprovided assessment of the wildlife habitat and wildlife in the DBW protect area. Wildlife in the existing Discovery Bay community and WWTP are those adopted to urban settings. The study area is a farmed agricultural field Construction of WWTP facilities within the study area is not expected to reduce the diversity of species or number of species. b. Reduction of the numbers of any unique,rare or endangered species of animals? X For the Initial Study a special-status Wildlife Habitat Assessment was performed by Biosearch Wildlife Surveys (BWS). This biotic wildlife study is presented in Appendix C.According to BWS, the only portion of the lands evaluated that have potential for impacts to endangered or threatened or special concern species is the "study area" The impacts and mitigation measures identified by BWS have been incorporated into the Initial,Study and are presented below.- San elow:San Joaquin Kit Fox Impact: The study area is at the edge of the range for the kit fox. The study area should be considered'occupied by San Joaquin kit fox habitat due to the proximity of recent sightings and presence of appropriate habitat. Assuming only the sludge lagoon is relocated to the study area, the WWTP project would result in loss of an estimated 6 acres(i.e., a sludge lagoon of an estimated 2.5 acres, with an additional 2.5-acre laydown area around the perimeter of the sludge lagoon and 1.11 acre for a maintenance access road). S = Significant I = Insignificant 38 __ ........................................................................................................................................................................................... ...........................................................................................-.................. ........... ................ EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S Mitigration To compensate for the loss of kit fox habitat, a habitat preservation area shall he established. The United States Fish and Wildlife Service (USFWS)shall be contacted to determine an appropriate compensation ratio. A habitat managementplant will be developed for the habitat preservation area to enhance habitat quality for the kit fox. Both the USFVS and California Department of Fish and Game(CDFG)will be consulted regarding the specifics of the habitat management plan, and whether a Biological Opinion or incidental take permit will be necessary. Additional or pre- construction surveys shall be performed(14 to 30)prior to construction. If potential dens are located within 100 feet of the project footprint they will be monitored for three consecutive days to ensure that they are notbeing used by kit fox. Dens that are not occupied can then be excavated,following VSFWS and CDFG approval. Results of the pre-construction surveys shall be submitted to USFTVS and CDFG within two weeks of completion. Throughout the construction period, all of the following measures are required.- a) exclusion fencing around the perimeter of the work area, b)all excavated holes and trenches greater than two feet deep shall be covered at night or provided with escape ramps; c)all pipes and culverts kept overnight shall be inspected prior to work the following day; d)food-related trash shall be disposed of in closed containers; e) firearms and pets shall not be allowed on the project site;fi use of rodenticides and herbicides shall be prohibited, g)an employee education program shall be presented tofieldpersonnel prior to initiation of construction; and h) injury to or death of kit fox shall be immediately reported to CDFG and USFW3. California Red-Legged Frog Ilmpact. The study area contains upland habitat that may provide potential foraging and sheltering habitat for the California red-legged frog. No breeding habitat is present within the study area. Mitigation: Wastewater treatment plant facilities(including layout areas) shall be set back a minimum of 300feetftom to the top-of-bank of the Reclamation District 800 canal. The project shall be constructed using methods that avoid discharge of sediment into canal. Giant Garter Snake IM The Reclamation District 800 canal at the west boundary of the study area provides marginal habitat for the giant garter snake. The study area is within the historic range of the species. S = Significant I = Insignificant ' 39 .............................. .............. .......... .. ........ . ......... ......... ...............__. ...... ...................._....... ......... .._...... ...__.... ......... ......... ......... ............. _. ..._...................................... DISCOVERY HAY TREATNMNT PLANT EXPANSION EXPANDED INITIAL STUDY AM SEWER CONVEYANCE MASTER PLAN APRIL 1998 S I Mitigation: The project shall be designed to avoid impacts to the canal. Wastewater treatment facilities shall be situated 300 feet behind the top-of-bank of the canal, and discharge of sediment into the canal shall be avoided Burrowing Owl IMM Burrowing owls are known from the vicinity of the study area, and potentialburrows were present. Construction of wastewater treatment facilities in the study area is anticipated to result in loss of an estimated<6 acres of burrowing awl habitat, if they are present CDFG guidelines consider the following activities to be impacts to burrowing owls: a)disturbance within 50 meters of an occupied burrow(75 meters during the nesting season); b)destruction of burrows; and c)destruction offoraging habitat within 100 meters of an occupied burrow. AAgotion:Prior to construction, a survey for burrowing owls and burrows shall be performed. TIIe study shall adhere to CDFG protocols and consist of an initial impact assessment, and if necessary, surveys on four days at dawn or dusk performed during the peak of breeding season (15 April- 15 July). A buffer zone of 500 feet around the perimeter of the site where WWTP facilities are planned will also be surveyed, where possible. If burrowing owls are discovered during the pre-construction survey, then passive relocation techniques will be carried out following approval by CDFG. However, occupied burrows will not be disturbed between I February and 31 August Raptors Impact: Development of wastewater treatment facilities in the study area would result in loss of potential foraging habitat for special- status raptors including peregrine falcon, Swainson's hawk, white- tailed kite, northern harrier, short-eared'owl, golden eagle, ferruginous hawk,prairie falcon and merlin. Breeding habitat is not available in the study are for any of these species. Mitigation: The loss of an estimated 6 acres of foraging habitat is not significant given the abundance of similar habitat in the region. In addition, the lands set aside in the San Joaquin kit fox mitigation would provide foraging habitat for the raptors listed above. Northern Harrier Im act: Northern harriers were observed in the study area by BWS on 7April, and nesting habitat is available in the study area. S = Significant I = Insignificant 40 _ ........ ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ....._.. _............................. . _.. ...................................... ...... . EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S I Mitigation: Surveys shall be performed three times during the breeding season within two hours of sunrise to determine if harriers are nesting. If nesting harriers are present, construction shall not commence/resume until the juveniles have fledged. Shorebird and Wading Bird Impact: The,construction of wastewater treatment facilities within a 6- acre portion of the study area could result in the loss offoraging habitat for special-status shorebirds, including mountain plover and longb fled curlew, and wading birds, including great blue heron, great egret and white-faced ibis Breeding habitat is not available an the project site for any of these species. Mitigation: The loss of approximately d acres offoraging habitat is not significant given the abundance of similar habitat in the region. In addition, the lands set aside for kit fox mitigation would provide foraging habitat,for the shorebirds and wading birds listed above. Special-Status Bat Species Impact: Development ofwastewater treatmentfacilities in the study area is expected to result in'loss cif an estimated 6 acres offoraging habitat,for pallid bat, Townsend's big-eared bat, western mastiff bat and five species ofMyotis. No roosting habitat is present on-site for any of these species. Mitigation: Loss of an estimated 6 acres offoraging habitat is not significant given the abundance of similar habitat in the vicinity. In addition, the lands set aside in the'kit fox mitigation would provide foraging habitat for bats listed above. Western Pond Turtle Impact:' Western pond turtles are present in the canal to the west of the study area. The species is generally restricted to aquatic habitats except during egg-laying. The potential site for'wastewater treatment facilities shown in Figure II provide low quality nesting sites for western pond turtle. Mitigation: The project footprint provides a 300 foot wide buffer between thefacilities and the east bank of the canal. This buffer provides potentia habitat for western pond turtle. Moreover, the erosion control measures incorporated into the project will avoid discharge ofsediment into the Reclamation District 804 canal. c. Introduction of new species of animals into an area, or result in a barrier to the migration or movement of animals? X S = Significant I = Insignificant 41 _....... ......... ......... ......... ....__... _ ....._. ......._. ........... ......... ......... ...._.... ......... ......... ......... _.._..__. _ _. ............_.. ......... ......... ......... DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE h(ASTER PLAN APRIL 1998 S The relatively small size of project and the limited presence of humans within the study area after the close of construction is not expected to significantly effect existing species. d. Deterioration of existing fish or wildlife habitat? X The 300 foot setback from the Reclamation District 800 canal, in combination with the kit fox mitigation measure,protect aquatic and terrestrial habitat. 6. Noise. Could the proposal result in: a. Increases in existing noise,levels? X _ There are no nearby sensitive receptors for construction work performed within DBW. The WWTP is enclosed on the west side by a sound barrier and wall, and the study area is bounded by agricultural lands and Highway 4, which are not sensitive receptors. There are sensitive receptors adjacent to work areas within the existing Discovery Ray community. There will be daytime noise during the construction period. Following construction, the noise levels will return to the existing level. Construction Noise and Other Construction-Related Effects ftac Figures 6, 7 and 8 identify specific areas where the Sewer Conveyance Master Plan show construction of mains and lift stations within Discovery Bay. This work involves sawing ref pavement; backhoes, dump trucks and flat bed trucks would be utilized to excavate trenches and haul construction materials; and noisy equipment is needed to backfill trenches and repave disturbed areas. These construction activities generate significant noise during the construction period They also generate vibrations, dust and can interfere with parking on the residential street, as well as conflicting with driveway access to private lots. These are significant construction-related effects. Mitigation:All of the following measures are required to mitigate' noise and associated construction-related problems in the existing Discovery Bay community. i. Noise generating construction activities, including such things as power generators, shall be limited to the hours of 8:00 AM to 5:00 PM,Monday through Friday, and shall be prohibited on weekends, as well as state and federal holidays. S = Significant I = Insignificant 42 _.... ...._..._ ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ............ ............. ... .......... ... ................................................................... ....... EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER C40NVEYANCE MASTER PLAN S I ii. DDSD shall require their contractors and subcontractors to fit all internal combustion engines with mufflers which are in good condition. hi. At least one week prior to commencement of grading, the applicant shall post the site and mail to the owners of property within 300 feet of work areas notice that construction work will commence. The notice shall includea list of contact persons with name, title,phone number and area of responsibility. The person responsible for maintaining the list shall be included. The list shall be kept current at all times and shall consist of persons with authority to indicate and implement corrective action in their area of responsibility. The names of individuals responsible for noise, dust and litter control, tree protection, construction traffic and vehicles, erosion control, and the 24-hour emergency number, shall be expressly identified in the notice. The notice shall be re- issued with each phase of construction activity. A copy of the notice shall be kept on file by DDSD, accompanied by a list of the names and addresses of the property owners noticed, and a map identifying the area noticed. , iv. The contractor shall submit a dust and litter control program for the review and approval of DDSD. Any violation of the approved program shall require an immediate work stoppage. Construction work shall not be allowed to resume until, if necessary, an appropriate construction bond has been posted. v. The contractor shall make a good faith effort to avoid interference with existing neighborhood traffic,f lows. This shall include provision for monitoring and controlling areas in which to park construction equipment and the commute vehicles of construction crews. vii. Transporting of heavy equipment and trucks shall'be limited to weekdays between the hours of 8 AM and 5 PM. vii. Within work areas along roads,for safety, one lane must be kept open. viii.The site shall be maintained in an orderly fashion. Following the cessation of construction activity, all construction debris shall be removed from the site. S = Significant I = Insignificant 43 ........................................................................................................ ........................................... ......................... DISCOVERY DAY TREAThffilTr PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 S I b. Exposure of people to severe noise levels? X See response 6 a 7. Light and Glare. Could the proposal produce new light or glare? X Lighting is not currently a part of the project, and the facilities at WWTP are low-rise, concealed by the existing concrete wall at the property line. Because reflective materials will not be used, glare is not a significant impact. It should be recognized that future design level studies may determine the need for lighting of wastwater treatment, acilities in the study area. In that case, DDSD indicates that its normal construction practice is to use low reflective lighting with shrouds. Possibly motion sensors or other automatic dimming devices would be specified. 8. Land Use. a. Could the proposal result in a substantial alteration of the present or planned land use of an area? X General Plan Land Use Designation: The WWTP is designated Public Semi-Public(PS); the "study area"is designated Delta Recreation and Resources(DR). Figure 14, General Plan Land Use, shows the adopted General Plan designations in the vicinity of Sanitation DistrictNo. 19. As the title implies, the 'Public and Semi-Public"designation includes properties owned by public governmental agencies such as wastewater treatment plants, libraries,fire stations, schools, etc. This designation is also applied to some public transportation corridors (freeways, highways, and BART), as well as privately-owned transportation and utility corridors such as railroads, PG&E lines, and pipelines. A wide variety ofpublic andprivate uses are allowed by this General Plan category. However, the construction ofprivate residences or private commercial uses, and the subdivision of land, are not considered compatible with this designation. S Significant I = Insignificant 44 .............................. ...... ..................... DR _ onwoM RVAc'e._ t Bixle `�., •:.errner .r,...::,.._. `.....__.:.,. — - - -- ,t T`' • ' , , ' SY. .. �.A(1UFDt/f�T `I gAi19- .. .. BM` 7!1 tsrsrcua 15 .14 ------------ - iyy• N r I : i Town tetian 7,;i7l+ a i , C - ,• t oxwoonf � .� � cr� is RpAp Y � �� t+d PR SN IDS j u I 1 i 2 A',., E y f JUA ...- { stun . I s r S Poiret of Timber Road 't'PARR � � OA d f f � L 8k 7 27 JY 1 VIIII , PR i Ail, _� Sting Z. OF . �Hi htrva, t ccs HIHway M 8>~' •.. : ,"'" Highway 3a. �, 5 i 1• �' C , T Study.- r as Y Areaz iY AC 1 :DR ;: " - -- t ->:w SINGLE FAMILY RESIDENTIAL(Units per net acre) COMMERCIAL AND INDUSTRIAL OPEN SPACE AND OTHER USES SM MEDIUM(3.0 to 4.9) CO COMMERCIAL OS OPEN SPACE SH HIGH(5.0 to 7.2) OF OFFICE PS PUBLICISEMI-PUBLIC CR COMMERCIAL RECREATION PR PARKS AND RECREATION MULTIPLE FAMILY RESIDENTIAL AL AGRICULTURAL LANDS AC AGRICULTURAL CORE ML LOW(7.3 to 11,9) DR DELTA RECREATION AND RESOURCES WA WATER Figure 14 General Plan Land Use Graphic Scale: Source:Contra Costa County General Plan:1995-2010 0 1500' 3000' 45 DISCOVERY HAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1999 S I The "Delta Recreation and Resources"category includes lowland areas in the Delta area of Contra Costa County. Much of the lands in this category are protected from inundation by levees, and includes areas with high water table, and areas that would be flooded in the event of levee failure. Additionally, lands within this designation include some areas of valuable wildlife habitat. General Plan policies discourage urban development of DR lands, and protection of resource values is encouraged. There are no General flan policies that would preclude'construction of pipelines or placement o,f` treatment plant facilities in lands designated DR. The Los Vaqueros pipeline, which connects the dam with Old River was constructed on lands designated DR and this pipeline passes through the 18:6-acre study area that is shown in Figure 14. It should also be recognized that the Public FacilitieslServices Element of the General Plan discusses the Delta Diablo Sanitation District and Sanitation District No. 19 on General Plan page 7-17. It notes that the WWTP is to be expanded, and that treated effluent is discharged into a reclamation drain and then into Old River. Sewer Service Goal and Policies erre presented on pages 7-23 through 7.26 The expansion of the plant is consistent with the policies presented in the adopted County General Plan. b. Will the proposal be consistent with existing zoning plans and either applicable land use controls? X The County Zoning Map ofDiscovery Discovery Bay and vicinity is presented in Figure 15 on a USES Topographic Base Map. To enhance` readabillty, the lands within Sanitation District No. 19 are shaded The County.Zoning Ordinance exempts wastewater treatment plant facilities and the collection system from land use permit requirements. Chapter 82 of the Zoning Ordinance contains two sections that specifically address the WWTP expansion and the sewer conveyance Master Plan. 82=2.010 Utilities and Pipelines. The use of land for rights-of-way for the construction, maintenance and repair ofpublic utilities and publicly-owned utilities and for privately-owned pipelines for the transportation of ail gas, water and other substances transportable by pipelines, is not regulated or restricted by Division 82 and 84.Accessory and appurtenant structures forming a part ofpublic utilities,publicly-owned utilities and pipelines are not regulated or restricted by Divisions 82 and 84, except for setback regulations. (Prior code§8120. Ord. 382) S = Significant I = Insignificant 46 . _ _ ... . ..._..... ......... _. ......... ......... _........ ......... ..........._. .... ......... ......... _ ................................................ ..... * ' : Bixt¢r ernar {` GttWOW . RMC`i• '\ �. + � � ...*.»»«ai6.»'rr�eas��siwreewma :.�a�«r.:_ar» »»»«.rw ..»:. :.».« 4�4I A4 15 y 1 °x c:�s�rc^ a'io •+ f Ilk- A-3- i r� A"'-40 0 tp R 'w 0 0 D T A O: #Sh,'ded AI Are Lands Wi# in it ation Yls# .:: ,. r m> Al,, u4 i tF -Point of Timber Road - )7 /y" Utin u , d. i A440 � ItV1l1ITP� x [ a EX ;07-7717711 7173 ;Highway 4>. ... 11 R IA C T i4-stu4p 34 Area \ .. PumpiN is" A4075 S 3 , g Agricultural _.. 3_ _. A-2 General Agricultural District A-40 Exclusive A ricultura#E3istric# � A-3 Heavy Agricultural District P-1 Planned Unit Development 15i A-4 Agricultural Preserve District i Figure 15 Zoning Map Graphic Scale: Source:Contra Costa County Zoning Map 0 1500' 3000' 47 DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRM 1598 S I 82-2.020 Water and Sewage R gurements. Water supply and sewage systems an"r facilities required for any use, construction, structure, or other development to be established under a permit issued pursuant to this title shall comply with Chapters 414-4 and 4203 G of this code and the health officers approval. (Gr. 81-56 J 4) These sections of the Ordinance Code indicate that facilities at the WWTP site and "study area"which are above;ground are subject to the setback requirements of the applicable zoning district Wastewater facilities are exempt from other provisions of the Zoning Ordinance. 9. Natural Resources. Could the proposal result in an increase in the rate of use of any natural resources? X The Safety Element of the General Plan identifies areas of known mineral resources. The only mineral resource identified in the Byron area is the outcrop belt of the Domengine Sandstone, which is more than 4 miles southwest of Discovery Bay. A study of mineral resources performed by the US Geological Survey(Bailey and Harden, 1975) identified no mineral resources on the site. 10. Risk of Upset. Could the proposal involve: a. A risk of an explosion or the release'of hazardous substances {including,but not limited to, oil,pesticides, chemicals or radiation}in the event of an accident or upset condition? X A properly operated and maintained wastewater treatment plant and collection system should not pose a significant risk of release of hazardous substances. The WWTP must be sized to prevent'release of raw(untreated)sewage into the Reclamation District 800 canal, and failure of a lift station (PS)should not be allowed to result in raw sewage backing up into the streets or residential dwellings. To prevent this from recurring, lift stations are monitored by remote sensors which signal attention to responsible personnel 24 hours per day,.who can take corrective action. According to District staff,failure ofa'lift station has never resulted in raw sewage in the street. S = Significant I r Insignificant 48 ...... 1.11 ......... ......... ......... .... ... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... .................................................................... .. .. .... EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S I The effluent exiting the plant is regulated by the RWQCB. DDSD is required to submit the results of water quality testing to the RWQCB to document compliance with applicable water quality standards. Water quality is a concern because of the proximity of the Contra Costa Water District's Los Vaqueros intake to the outfall point of the Reclamation District 800 canal into Old River. However, CCWD elected to place its Los Vaqueros intake on Old River just south of Highway 4, because Old River flow tends to be to the south(toward Clifton Court Forebay)due to pumping associated with that project. During pumping, the Contra Costa Water District's intake is "upstream"of the canal outfall into Old River. b. Possible interference with an emergency response plan or an emergency evacuation plan? X According to the County Office of Emergency Service, the proposed project does not conflict with their plans. 11. Population. Could the proposal atter the location, distribution, density, or growth rate of the human population of an area? _ X The project involves providing wastewater treatment plant and collection facilities intended to accommodate the DBW project. The change in the population of the Discovery Bay area that is anticipated was addressed,by the DBW EIR. 12. Housing. Could the proposal affect existing housing,or create a demand for additional housing? X .The facilities proposed are designed to serve the DBW project(1 953 dwelling units). 13. Transportation/Circulation. Could;the proposal result in: a. Generation of substantial additional vehicular movement? X There will be short-term construction-related traffic and increased traffic delays caused by construction of collection system facilities within or adjacent to roadways. Over the longterm, the DDSD staff will commute to and from work. Using the significant criteria of the Los Vaqueros EIR,14 these effects are not significant. 14 Significance criteria include any of the following: 1)traffic delays or detours of more than 1 week at any one location;2)detours of greater than 5 miles,or 3)traffic flow on roads that carry more than 15,000 average daily trips (ADT)per lane. S = Significant I = Insignificant 49 k, «....:,.,. ......... ......... ......... ......... ......-_. _ ....... ........ ......... .......... ........ ......... ......... ......... ......... ...__-.. _... .._........ ......... ......... ......... DISCOVERY BAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL,1998 S I b. Effects on existing parking facilities, or demand for new parking? — X There is adequate existing on-site parking for construction workers, and for the vehicles of the DDSD staff, c. Substantial impact upon existing transportation systems? — X Ransportation to acrd front the site is by private vehicle. There will be no impact on transportation systems. d. Alterations to present patterns of circulation or movement of people and/or goods? X The existing circulation pattern is adequate to meet the needs of the enlarged facility. Any facilities south of Highway 4 would require a service road for maintenance access. There is an existing canal roadlHighway 4 intersection that could be modified to accommodate the new service road. e. Alterations to waterborne,rail or air traffic? X See response 13.c, f. Increase in traffic hazards to motor vehicles, bicyclists or pedestrians? X The long-term trac associated with the proposed use is limited to the staff commute trips to work, and for the maintenance work of DDSD staff.' The volume of trips is low, and no bicycle or pedestrian trips to and from WWTP facilities are anticipated. If wastewaterjhcilitiesare constructed south of Highway 4, a new access will be required by the District. The location and other details of the access will need to be coordinated with CalTrans to ensure that traffic safety hazards are not created. 14. Public Services. Could the proposal have an effect upon,or result in, need for new or altered governmental services in any of the following areas: a. Fire protection? X The aboveground facilities are not structures,for human occupancy. Construction materials are chiefly concrete and steel.' b. Police protection? X There are no unusual law enforcement problems associated with the proposedexpansion of the WWTP and associated collection system. S = Significant I Insignificant 50 .......11.1..............I..............................................................................................................................I.......... ................................................................................................................. ....................... ............ EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S I c. Schools? X The proposed facility does not make demands on the public school system. d. Parks or other recreational facilities? The project does not effect the recreational needs of the general public or of Discovery Bay residents. e. Maintenance of public facilities,including roads? X Construction of the facilities needed to provide wastewater service to DBW implies a commitment of resources to maintain those facilities. f Other governmental services. X Expansion of the Sanitation District No. 19 treatment plant and collection system implies a commitment to staff those facilities. 15. Energy. Could the proposal result in: a. Use of substantial amounts of fuel or energy? X During 1996 and 1997, the wastewater treatment plant electrical energy consumption has averaged approximately 2,300 kilowatt hours/day(kWh/day). This energy consumption includes operation of PS Wat the treatment plant and operation of aerators in the sludge lagoon Operation of the remaining wastewater pumping stations results in an additional energy consumption of approximately 370 WhIday. Recent installation and operation ofa Ultra-Violet disinfection system in the fall of 1997 has led to an increase in energy usage of approximately 700 kWh1day. Since the sludge lagoon was recently partially emptied in NovemberlDecember 1997, the aerators at the sludge lagoon have not needed to be turned on, resulting in a decrease in associated energy cost of approximately 500 kWhlmo. The current Sanitation District No. 19 Wastewater Treatment Plant and Collection System energy usage is approximately 2,700 kWh1day. b. Substantial increase in demand upon existing sources of energy, or require the development of new sources of energy? X S = Significant I = Insignificant 51 .......... ......... ------------ _1111_. ......... ......... ......... ......... ...._. ... .. ....... ................_....... ...._... ......... ......... ......... ......... ......... ..............._.. _ _.111 . 1 .. ............. ......... . .......1 .._111... DISCOVERY BAY TREATI3 LENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 S A tiff percent increase in treatment capacity would be expected to result in an incrementally proportional increase in energy usage. It might be expected that the location of additional treatment plant facilities across Highway 4 at a location somewhat distant from the treatment plant may result in some additional energy usage for pump operation. Similarly, the service distance to the new developments may result in additional energy usage beyond the existing per unit amounts to accommodate the longer distances and the energy requirement associated with pumping sanitary sewage to the plant in this fiat area. Building a new treatment plant at a location more centrally located to the new development is not energetically or economically viable due to the relatively small size of the plant. Constructionenergy usage has not been precisely quantified. The above-mentioned increases in energy usages have been analyzed in the preparation of the Discovery Bay );vest EII, and are not significant relative to this project. 16. Utilities. Could the proposal result in a need for new systems, or substantial alterations to utilities: X If the study area is used to accommodate wastewater treatment facilities, utility service would need to be extended across Highway 4. For example, the sludge lagoon would require two pipelines,along with electrical service. Such extensions would require an easement from CalTrans, but would not be a significant impact. 17. Human Health. Could the proposal result in. a. Creation of any health hazard or potential health hazard (excluding mental health)? X A properly operated wastewater treatment plant that complies with the requirements ofregulatory`regulatory agencies will not create hazards to human health. It should also be recognized that the i3 WTP is an existing facility that has been continuously in operation for more than 30 years. During that period of time there is no evidence that it has been responsible for health-related problems. b. Exposure of people to potential health hazards? X No changes in the existing DDSD operation are proposed that would create health hazards. 18. Aesthetics. Could the proposal result in the obstruction of any scenic vista or view open to the public, or will the proposal result in the creation of an aesthetically offensive site open to public view? X S Significant I == Insignificant 52 ............................................................................................................................. ................................................................................................... EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S The segment of State Route 4 that passes south of Sanitation District No. 19 is designated a scenic route by the Transportation Element of the Contra Costa County General Plan. The lands in this portion of the County are nearly level. The residential lots in the Discovery Bay area were largely concealed by a masonry sound barrier wall. The WWTPfacilities are open to viewfrom>the scenic corridor, but are set back more than 0.5 miles from the road. The 18.6-acre study area is lower in elevation than Highway 4, and facilities would be located as much as 340 feet(or more)from the road, so they will not obstruct scenic views and views of the facilities themselves would be softened by distance.. According to CEQ-4, views inside a project can be a significant impact. With regard to Sanitation District No. 19, aboveground facilities consist offour lift stations in DB W(located PS-1 through PS- 4 in Figure 5). Figure 16, View E shows the aesthetics of lift station that was recently constructed by DDSD. In this case, some structures not directly related to the lift station can be seen in View E. The extraneous structures are as follows: • Lift Station "R"is located on the west side of Newport Drive. To protect the facility from being damaged by an out-of- control vehicle,five bollards have been installed that are approximately 32 inches in height. 0 Behind the lift station is a guard rail that is associated with the road embankment(i.e. traffic safety feature). & The tall vertical structure is a street light standard. 0 In the background are PG&E high voltage electrical lines. In summary, the lift station includes an aboveground storage cabinet, vent, metal frame to which is attached a telemetry device (which resembles a TV antenna). In the Discovery Bay project these facilities were installed in the front yard area of residential lots. They are not aesthetically compatible with residential neighborhoods. Moreover, there can be odor problems because thesefacilities require venting and they are adjacent to front doors and windows; and there are noises associated with the operation of the mechanical equipment. S = Significant I = Insignificant 53 .................................... --------------- ........................ ............ ......... ......... ......... ......_........._. ........ .......__... ......... ......... ......... ._....... ......... ......... ...._._.. _ _ _...... _......... ......... ......... ......... ......... ......... ........... Looking Pumping W,y+.��estfoat m ra Z . t, tk P S z '�' , v a E , i .1 # Figure 16 Views E, E & G Source:Darwin Myers Associates 54 ............................................................................................................................................................... ........................................................................................................................ ............................ EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN Visual Quality impact. The construction of lift stations on residential lots creates land use compatibility, visual compatibility, odor and noise problems. Cumulatively, these effects are a significant impact Figure 16, Views F and G, illustrates alternative sites for lift stations. View F is looking across Newport Drivel at existing water well No. 4. Carollo Engineers has suggested that PS "I"could be constructed within the howularies of this DDSD site. View G is,looking southeast within the Centex project. Lift station PS "S"is enclosed by a wood wall that is 6jeet high. This facility is located on the;edge of neighborhoodpark, Below-ground lift stations can serve to minimize aesthetic impacts and, according to DDSD staff, they will be used when feasible, but they do not completely mitigate the identified impacts. Mitigation Within Discovery Bay West, lift stations should be sited outside of residential lots. Potential locations include the parkland areas adjacent to the proposed real estate lakes or along the Bixler Roadfrontage ofDB W. For parkland sites, a landscape and irrigation plan is required to screen the site. The plan shall be submitted, or review and approval of the County Zoning Administrator, who is charged with responsibilityfor:review and approval.of the landscape plans for the parkland area in the DBWdevelopment. the plan shall respond to the;ollowing: i. Be prepared by a licensed landscape architect and shall be certified to be in compliance with the County Water Conservation Ordinance. 11. California native, drought-tolerant plants shall be used as much as possible. All trees shall be a minimum of 25 gallons, and all shrubs shall be a minimum of gallon sizes. iii. Provisions shall be made to guarantee long-term maintenance of the plant materials and irrigation system. iv. Provision shall be made for fencing the lift station, where necessary. 19. Recreation. Could the proposal result in an impact upon the quality or quantity of existing recreational opportunities? X S = Significant I = Insignificant 55 ............... ........... ........... _...... . ....................._... ......_...... .....................__.. ......... ......... ......... ......... ......... ......... ......... _. .. ..-_..... ......... ......... ......... ......... ......_ .......... DISCOVERY BAY TREAT MMT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER ICONVEYANCP,MASTER PLAN APRIL 1998 S I The Discovery Bay Country Club is just west of the existing WWTP. Since the facilities of Sanitation District No. 19 do not make demands on recreational facilities, it is clear that the project does not have a significant impact on recreational opportunities. Nevertheless, the WWTP'expansion project, because of increased odors, could have a minor adverse effect on the enjoyment of go ei rs using the portion of the course hole that is just west of the treatment plant. (See Figure l l for the location of this golf course hole.) 20. Cultural Resources. a. Could the proposal result in the alteration of or the destruction of a prehistoric or historic archaeological site? X The DBW"EI.R evaluated the archaeologic sensitivity of that property, and the existing Discovery Bay area was previously graded. The only area where some potential,for archaeologic resources exists is in the "study area". The Stage 2 Final EIRIEIS for the.dos Vaqueros project (SCH#_91063072)contains a Cultural Resources chapter that evaluates the Old River pipeline corridor, which bisects the 18.6-rscre study area. It indicates that there are no structures dating prior to 1945 or other structures eligible for listing on the National.Register of Historic Places. There are no known archaeologic sites within the study area but there is some potential for buried sites. Archaeology Im act. Buried archaeologic sites may be present within the study area. Such resources, if they exist, could be adversely affected by ground-disturbing activities associated with construction of'WWTP facilities in the study area. Mitigation: Thefollowing'measures are required to mitigate archaeological impacts: I. Prior to construction in the study area, an archaeologist shall perform a i to 2-hour f eld seminar for the prime contractor, construction supervisor and construction inspectors, to provide insight into the types of cultural resources that may be present. The documentation shall include notes in the DDSD file identifying the archaeologist by name and qualifications; date of field seminar; time of day1duration of seminar; identify all attendees by name, title and firm; and include an agenda for the field seminar. S — Significant I = Insignificant 56 ...... - ......... ......... ......... ......... ......... ......... ......... ......... ......... .. ...... . ......... ......... ......... ......... ......... ......... .......... ... _... ......... ........ .................... . EXPANDED INITIAL,STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN S I ii. Should archaeological materials be uncovered during grading, trenching or other on-site excavation(s), earthwork within 30 yards of these materials shall,be stopped until a professional archaeologist who is certified by the Society of Professional Archaeology(SOPA)has had an opportunity to evaluate the,significance of the f nd and suggest appropriate mitigation(s), if deemed necessary. iii. In the event of discovery'or recognitionof any human remains on the site, there shall be no further excavation or disturbance of the site or any nearby area reasonably suspected to overlie adjacent remains until the coroner of Contra Costa county has been contracted,per Section 7050.5 of the California Health and Safety Code. iv. Following a significant find appropriate mitigation of the cultural resources may include monitoring offurther' construction andlor systematic excavation of the resources. Any artifacts or samples'collected as part of the initial discovery, monitoring or mitigation phases shall be properly conserved, catalogued, analyzed, evaluated'and curated along with associated documentation in a professional manner consistent with current archaeological standards. b. Could the proposal result in adverse physical or aesthetic effects to a prehistoric or historic building, structure,or object? _ X See response 20.a. C. Does the proposal have the potential'to cause a physical change which would affect unique ethnic cultural values? X See response 20.a. d. Will the proposal restrict existing religious or sacred uses within the potential impact area?'' _ X See response 20.a. S = Significant I = Insignificant` 57 _....... ......... ......... ......... ......__. ....... ......... . ......... ......... ......... ......... ......... ......... ......... .._...... ... __ .... _........ ......... ......... ......... DISCOVERY HAY TREM ENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE LWTER PLAN APRIL 1998 S I 21. Mandatory Findings of Significance. a. Does the project have the potential to degrade the quality of the environment, substantially reduce the habitat of a'fish or wildlife species,cause a fish or wildlife population to drop below self-sustaining levels,threaten to eliminate a plant or animal community,reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the,major periods of California history or prehistory? X The Initial Study has identified mitigation measures to reduce these impacts to less-than-significant and the project proponent has agreed to incorporate the mitigation measures into the project. b. Does the project have the potential to achieve short.-term to the disadvantage of long-term environmental goals? (A short- term impacton the environment is one which occurs in a relatively brief, definitive period of time while long-term impacts will endure well into the future.) X See response 21.a. C. Does the project have potential impacts which are individually limited, but cumulatively considerable? (A project may impact on two or more separate resources where the impact on each resource is relatively small, but where the effect of the total of these impacts on the environment is significant.) X The DRW EIR considered the cumulative impacts associated with the DBW project. The WWTP Expansion and Collection System Master Plan are a relatively small component of the cumulative impacts of that project. d. Does the project have environmental effects which could cause substantial adverse effects on human beings, either directly or indirectly? X See response 21.a. S = Significant I = Insignificant 58 _-------------------------------__-_____- � EXPANDED INITIAL STUDY DISCOVERY BAY TREATIVIENT PLANT EXPANSION APRIL 1998 ANDSEWER CONVEYANCE MASTER PLAN Ill. Discussion of Environmental Evaluation Based on the foregoing review,the project will not result in any potentially significant environmental impacts. x IV. Determination On the basis of this initial evaluation: I find that the proposed project COULD NOT have a significant effect on the environment,and a MITIGATED NEGATIVE DECLARATION will be prepared. x I find that although the proposed project could have a significant effect on the environment,there will not be a significant effect in this case because the mitigation measures described on an attached sheet have been added to the project. A NEGATIVE DECLARATION WILL BE PREPARED. I find the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT IS REQUIRED. DATE DARWIN MYERS,ENVIRONMEVTAL PLANNER 59 � _........ ......... ......... ......... ....._......._._. ..... .........__.......__. ......... ......... _....... ......... ......... ......... ......._. _ __... _. _...... ....._...... ......... ......... ......... APPENDIX A CHRONIC TOXICITY EVALUATION OF EFFLUENT FROM THE DELTA DIABLO WASTEWATER TREATMENT PLAN Chronic Toxicity In March 1998,Delta Diablo Sanitation District hired pacific Eco-Risk Laboratories to perform chronic toxicity evaluations of Discovery Bay effluent. These evaluations consisted of performing the U.S. EPA's freshwater three species short terra chronic toxicity tests: • 96 hour algal growth test with the green alga Seienastrum capricornutum,,: • three-brood(7 day)survival and reproduction test with the crustacean Ceriodaphnia dubia; y 7 day survival and growth test:with larval fathead minnows(Pimephales promelas)" The tests were conducted in conformance to guidelines established by the EPA manual"Short-Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving'Waters to Freshwater Organisms: (EPA/600/4-91/002} The results indicated that the Discover} Bay effluent was not toxic to the,green algae or the fathead minnows,however, there was toxicity observed with Ceriodaphnia at the 100%effluent treatment with respect to reproduction. uz }oval _ eo_wth_ _ Reproduction_ Or anism _ 1tiCl C LtJEC._ 0.NOEC LOEC- r -' OEC -Lk�EC - Selenastru ,dal h (j ht�i}� ' a a #r s i , ', `; ,KI t 'C) t ? � rf I(3f1,�o >lt}flla �4�137K�(�{i{I '�,j��1 Ca riCtN tttftUM-.-U2 effluent effluent Ceriodaphnia 100% >14g0'la f`+ �#' :� �',�•, ,:,. 100%dublu effluent effluentI " �` ' K; fluett effluent Pinaephales 1(?Q°lo >100% 10011/0 >1000/� sig t�f �!'� �� ,T �ol ' romelas_ effluent effluent effluent effluent Ek" t w°x ',> , '. " 3 NTOEC-No Observed Effect Concentration LOEC-Lowest Observed Effect Concentration .Priority.Pollutants Discovery Bay effluent was tested for priority pollutants in January and March of 1998. All of the EPA 608,624 and 625 pollutants were below the detection limits, For the metals,only copper and zinc,were above the detection limits,at 4.432 and 0.427 mg/,respectively. Pollutant Result rn /L EPA 608_ _ . w ..__.___a..._......_._.._ � Not detected at or above repo tines lurut� EPA :Tot detected at or above reporting limit EPA 62S Not detected at or abave re-pc�rtin�lirrut Metals(all,except those listed below) _ Not detected at or above re�ortin�limit Cof?mr __ ..._._.�.. .._W.. µv0....._.__....-.. _._.._ 0.012 4.4.27 -__---_�........�..,.__..._._.. __. ......... ......... ......... ......... ........._.. . _........ ......... ......... ......... ......... ......... ......... .........._.._. __. _.. _......... ........ ......... ......... ......... ......... .................................. Chronic Toxicity Evaluation of Effluent from the Delta-Diable wastewater Treatment Plant {Samples Collected March 9-13, 1998} Prepared For Delta.-Diablo Sanitary District 2500 Pittsburg-Antioch Hwy: Antioch,CA 94509 Prepared by Pacific Eco-Risk Labs, 827 Arnold Drive,Suite 100 Martinez, CA 94553 March, 1998 ..................................................................................................................................................................................- ....................................................................................................................... ........................... Pacific Eco-Risk Labs Environmental Consulting Table of Contents Page 1 . INTRODUCTION .................................................... ................ I 2 . CHRONIC TOXICITY TEST PROCEDURES ................ ................... 1 2.1 Receipt and Handling of Samples .............................I.....I.................. .............1 1 2.2 Test Organisms ..................................................................I...................... 17 23 Toxicity Test Procedures .............................................................................. 2 2.3.1 Algal Growth Toxicity Test with Selenastrum capricornutum ........................ 2.3.2 Survival and Reproduction Toxicity Test with Ceriodaphnia dubia ...................... 3 2.3.3 Survival and Growth Toxicity Test with Larval Fathead Minnows ...................... 4 3 . RESULTS .................................................................... .................5 3.1 Delta-Diablo Effluent Toxicity to Selenastrum capricornutum ..........................................5 3.2 Delta-Diablo Effluent Toxicity to Ceriodaphnia dubia ................................................... .................................... 3.3 Delta-Diablo Effluent Toxicity to Larval Fathead Minnows ......... 4. SUMMARY AND CONCLUSIONS ............................................. .. 13 Appendices A-F Raw Data & Summary of<Statistics ............ _. . _ _...._... ......... ..- . ........_............__.. ......... ......... ......... ......... ......... ......... ....._.. . __..... _.. . .......... ........ ......... ......... ......... ......... ................................. Pacific Eco-Risk Laboratories 1.0 INTRODUCTION In compliance with their NPDES biomonitoring requirements, the Delta-Diablo Sanitary District has contracted Pacific Eco-Risk laboratories to perforin chronic toxicity evaluations of effluent produced by the Delta-Diablo Wastewater Treatment Plant(DDWTP). These chronic toxicity evaluations consist of performing the.U.S. EPA's freshwater"three species" short terra chronic toxicity tests: •96 hr algal growth test with the green alga Selerrastrum capricvmutwrt.; • three-brood (7 day)survival and reproduction test with the crustacean Ceriodaphnia dubia • 7 day survival and growth test with larval fathead minnows (Pimepholes promelas) This suite of freshwater chronic toxicity tests were conducted on final effluent samples collected on March 9, 11, and 13, 1998. This report describes the performance and results of these'effluent tests: 2.0 CHRONIC TOXICITY TEST PROCEDURES The methods used in conducting these tests followed the guidelines established by the EPA manual "Short- Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater' Organisms" (EPA/600/4-91/002). 2.1 RECEIPT AND HANDLING OF THE EFFLUENT SAMPLES On March 9, 11, and 13 1998,grab samples of final effluent were collected by Delta-Diablo staff into appropriately-cleaned polyethylene cubitair ers. These samples were relinquished,under chain of custody, and transported by Pacific Eco-Risk staff to the laboratory in Martinez. Upon receipt at the testing laboratory,an aliquot of each sample was removed for analysis of initial water quality characteristics(Table 1). An additional aliquot was removed for use in setting up and/or maintaining the toxicity tests,with the remainder of the samples being stored at 4°C until needed. Table 1.Initial water quality characteristics of the Delta-Diablo Final Effluent Satttple Temp. pH D.O. Alkalinity Hardness Salinity Conductivity Total Matte (`C) (m,B/L) (mS/L) (mg/L) (ppt) (mS/cin), Ammonia> (mg/L N) 3/9198 19.1 8.04 7.8' 360 229 1.1 2.06 0.59 3/11/98 8.4 8.00 7:4 380 221 1.0' 2.01 c0.1 3113/98 12.7 8.04 8.8 362 241 0.9 2,19 0.22 1 .. ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ....._.. ......... ......... ......... ......... ......... ......... ._....._ .......................... Pacific Eco-Risk Laboratories 2.2 TEST ORGANISMS The Selenastrum capricomunmi and Ceriodaphnia dubia used in these tests were obtained from in-house laboratory cultures of these organisms.The larval fathead minnows were obtained from a commercial supplier (Aquatic Biosystems, Ft. Collins, CO). 2.3 TOXICITY TESTING PROCEDURES 2.3.1 Algal Growth Vests with the Green Alga Selenastrum capricornutum The short-term chronic algal toxicity test consists of a 96 hr bioassay in which the green alga Setenast:unz capricomutum is exposed to a dilution series of effluent concentrations and the effects on cellular growth determined.The specific'procedures used in this test are described below. The Selenastrum bioassays were conducted on the Delta-Diablo effluent sample collected on March 9, 1998. Effluent was pre-filtered(41.45 urn,using sterile filters)before use in these algal tests.The Control/dilution water for this test consisted of reverse-osmosis, de-ionized water.Aliquots of the Control/dilution water and the pre-filtered effluents were spiked with nutrients as per EPA guidelines.The nutrient-amended waters were then 0.45 um-filtered through sterile filters.The filtered,nutrient-amended waters were then used to prepare; test solutions at effluent concentrations of 6.25%, 12.5%, 25%, 50%, and 100/,r,. There were four replicates at each of the test treatments,each consisting;of a 250 mL glass erlenmeyer flask containing 100 mL of experimental media. Each flask was inoculated to an initial cell density of 10,0xW cells/mL of S. capricomuturn from a culture in log growth phase.These flasks were loosely capped and randomly positioned within a temperature-controlled water bath at 25°C,under continuous illumination (approximately 60 uE/m2ls)from cool-white fluorescent bulbs.Each day,the flasks were gently shaken in the morning and in the afternoon and re-positioned within the water bath. After a 96 hr exposure period,the flasks were removed from the water bath and the algal cell density in each was determined by spectrophotometric analysis of the cell density.The resulting call density at each treats-lent was analyzed and statistically compared to the Control treatment to determine any growth impairment,or toxicity,caused by the effluent(statistical analyses were performed using the ToxCalc statistical package). 2.3.1.1. Reference Toxicant Testing with Selenastrumcapricornuturri - Reference toxicant tests are performed monthly to document that the"in-house"culture of Selenastrum is,responding to toxicant stress in a typical fashion.The reference toxicant test was performed in an identical fashion as was the effluent toxicity test,except that zinc (as ZnC12)in de-ionized water was used in the place of the effluent. The zinc was tested at concentrations of 10, 2.5, 5, 10,and 20 ugfL.The test response data were then compared to the ongoing database of response data from previous reference toxicant tests performed in this lab.The Selenastrum ccapricornutum monthly reference toxicant test reported here was performed on March 5, 1998, and indicated that the organisms were responding to toxicant stress in a typical fashion. 2 . _.. ......... ......... ......... ......... ... ....................__..... ......... ......... ......... ......... ......... ......... .............. ... ......................... ......... ......... ......... ......... ..................... Pacific Ecce-Ride Laboratories 2,3,.2 Survival and Reproduction Toxicity Test with Ceriodaphnia dubia The short-term chronic Ceriodaphnia test consists of exposing individual females to the effluent at a dilution series for the length of time it takes for the Control treatment females to produce three;broods (typically.Severn days),after which effects on survival and reproduction are evaluated.The specific procedures used in this teNt are described below. The Control/dilution water for this test consisted of a mixture of commercial springy;waters (80% CaliStoga:20% Evian). The Control/dilution water and the effluent samples were used to prepare daily test solutions at effluent concentrations of 6.251©, 12.5%®, 25%,50%'0, and 100%.There were 10 replicates for the: Control and each effluent treatment,each replicate consisting of 15 mL of test soludon in a'30 mL plastic';cup. The test solution for each,cup came from a 200 mL aliquot of each effluent treatment to which the alga Selenastrum capricornutt m and Yeast-Cerophyll-Trout Food(YCT)had been added for food.The"new" water qualities (pH, D.U.,conductivity) were measured on these 200 mL aliquots prior to use in the test. Neonate Ceriodaphnia (<24 firs old),obtained from in-house laboratory cultures,were used to start this ".three-brood"test, which was initiated by allocating one neonate Ceriodaphnia into each of the replicate;cups. The cups containing the Control and effluent treatments were placed in a foam board which floated in a temperature-controlled water bath sous to maintain the water temperature in each replicate cup of 25°C,under fluorescent lighting on a 16L:8D photoperiod Each day of the test,fresh test solutions and a"new" set of replicate cups was prepared,as before. The'foam boards containing the Ceriodaphnia exposure cups were removed from the water bath and then each replicate cup was examined, with surviving `original' individual organisms being transferred to the corresponding new cup.The number of neonate offspring produced by each original organism was determined and then water qualities were measured for the old media from each treatment. The test board,now carrying Ceriodaphnia in fresh media, was placed back into the water bath. After six days of exposure,it was determined that 60% of the Control treatment Ceriodaphnia had produced their third brood of offspring,,and the test was terminated. This test produced two types of endpoint data: percent survival and number of offspring per surviving female.The data for each effluent treatment were analyzed and statistically compared to the Control treatment to determine any'reduction in survival or fecundity caused by the effluent(statistical analyses were performed using the ToxCalc statistical package). 2.3,2.1 Reference Toxicant Testing with Ceriodaphnia dubia - Monthly reference toxicant tests are performed to document that the"in-house" culture of Ceriodaphnia is responding to toxicant stress in a typical fashion.The reference toxicant test was performed in an identical fashion as was the effluent toxicity test,except that a'solution of copper(as CuSO4)was used in the place of the effluent. The copper was tested at concentrations of 8, 16, 32, 64,and 128 ug/L.The test response data were then compared to the;ongoing, database of response data from,previous reference toxicant tests performed in this lab.The reference toxicant test reported here was initiated on March 10, 1998,and indicated that the organisms were responding to toxicant stress in a typical fashion. 3 _.. _........ ......... ......... ......... ......... ........_... ......... .......... . . ......... ......... .._...... ._....... ......... ......... ......... ......... ......_..... . _... _._..... ......... ......... Pacific Eco-tisk Laboratories 2.3.3 Survival and Growth Toxicity Test with Larval Fathead Minnows The short-term chronic fathead minnow test consists of exposing larval fish to the effluent at a dilution series for seven days,after which effects on survival and growth are evaluated. The specific procedures used in this test are described below. The Control/dilution water for this test consisted of synthetic EPA moderately hard water.The Control/dilution water and the effluent were used to prepare daily test solutions at effluent concentrations of 6.25%, 12.5%, 25%r, 50%, and 100%.There were four replicates for the Control and each effluent treatment, each replicate consisting of 400 mL of test media in a 600 mL glass beaker. "'`dew"water dualities (pH;D.Q.,conductivity) were'measured on these media prior to use in the test. Larval fathead minnows(<24 hrs old), obtained from a commercial supplier,were used to start this test,' which was initiated by randomly allocating 10 fish into each of the replicates.These replicate beakers were placed in a temperature-controlled water bath to maintain the water temperature in each replicate at 25"C,under fluorescent lighting on a 16L:8D photoperiod. These test fish were fed brine shrimp nauplii twice daily. Each day of the test, fresh test solutions were prepared for each treatment and water qualities were determined, as before.The beakers containing the fathead minnows were removed frorn the water bath and each replicate was examined,with any dead animals,uneaten food,wastes,and other detritus being removed. The number of live fish in each replicate was determined and then approximately 80% of tate test media in each beaker was replaced with fresh media. "Old!'water qualities(temperature,pH, and D.O.)were measured on the old test water collected from one randomly selected replicate at each treatment.The test beakers were then placed back into the water bath: After seven days exposure, the number of live fish in each replicate beaker was recorded.Then, the fish from each replicate were carefully euthanized in methanol,rinsed in de-ionized water, and transferred to a pre-dried and pre-tarred drying pan. These fish were then dried at 100'C for 24hrs and re-weighed to determine the mean weight per individual fish. For this test, there were two types of data: percent survival of the fathead minnows, and the mean weight of the fish within each replicate.The dataa for each effluent treatment were analyzed and compared to the Control treatment to determine whether or not any statistically significant differences were observed (statistical analyses were performed'using,'the ToxCalc statistical package). 2.3.3.1 Reference Toxicant 'Testing with Fathead Minnows - In order to document that;the; fish used in these tests were responding to toxic stress in atypical fashion,a reference toxicant test was performed concurrently with the effluent test.The reference toxicant test was performed in an identical fashion as tht; effluent test except that a solution of copper(as CuSO4)was used instead of effluent. The response of these fathead minnows to copper was evaluated at test concentrations of 6.25, 12.5,25, 50, and 100 ug/L. The test response data were then;compared to the ongoing database of response data from previous reference toxicant tests performed in this lab.The reference toxicant test indicated that the organisms were responding to toxicant stress in a typical fashion. 4 ........ ...__...... .. ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ....._. ............... ......... ..._........................ .. Pacific Eco-Rask Laboratories 3.0 RESULTS The results of the toxicity evaluations conducted on Delta-Diablo final effluent samples are presented below. Results of the reference toxicant tests are also presented below. 3.1 DELTA-DIABLO EFFLUENT TOXICITY TO Selenastrum cupricvrnutum 3.1.1 Effluent Toxicity to 5elenastrum capricornutum The results of this test are summarized below in Table 2. Briefly,there was a;mean final algal cell density of 301,000 cells/mL at the Control treatment, and not less than 330,250 cells/mL at any of the effluent treatments,none of which were significantly less than the Control.The resulting NOEC (No Observed Effect Concentration) was 100%effluent while the LOEC (Lowest Observed Effect Concentration)was >100% effluent. The IC25 was>100% effluent. The raw data sheets and the summary of statistical analyses for this test are presented in Appendix A. Table 2.Effects of Delta-Diablo effluent on growthof Selenastrum capricornutum. Effluent Algal Population Density(cells/mL x 106) i Treatment Rep A Rep B Rep C Rep D Mean (cellstinL x los) Control 0.302 0.320 0.279 0.303 0.301 6.25% 0.410 I 0.303 0.290 0,318 I 0.330 12.5% 0.554 0.517 0.587 0.566 0.556, 25°/0 0.802 0.709 0.736 0.779 0.757' 50% 1.152 1.349 1.495 1.316 1.328 100% 1.441 0.9$0 1.214 1.3.56 1,243 No Observable Effect Concentration(NOEC)= 100%n effluent Lowest Observable Effect Concentration(LOEC)=>100%n effluent 1015 > 100% effluent ICzs > 1009tr!effluent IC40 > 100% effluent IC50 > 100% effluent TU(100/1025)=< 1.4 5 _._. ......... ......... ......... ......... ...... ._. ..............._._._..... ......... ......... ......... ......... ......... ......... ......... _.. .._..... ......... ......... ......... ......... ... ..._......... ........... Pacific Eco-:Risk laboratories 3.1.1 Reference Toxicant Testing with 5elenastrum capricornutum The results of the monthly reference toxicant test perforated for 5elenastrurn are summarized below in Tahle :3. Briefly,there was'a mean final algal cell density of 603,250 cells/mL at the Control treatment,and not less than 603,250 cells/mL at any of the test treatments up through 5.0 ug/L Zn. At 10 ug/L Zn, algal ceU density decreased to 526,250 cells/mL, which was significantly less than the Control.The resulting IC25 was 12.4 ug/L. The results of this test are consistent with the historical reference toxicant performance of the laboratory culture of this alga,indicating that the algae used in the effluent test were responding to toxicant stress in a typical fashion: The raw data sheets and the summary of statistical analyses for this test are presented in Appendix B. Table 3. Reference toxicant testing.Effects of zinc on growth of Sedenastrum,capr cornutum.. Zinc Algal Population'Density(cells/mL x 106) Mean Treatment (Cells/mL x lob) Rep A Rep B Rep C Rep D Control 0:645 0.556 0.624 €3..581 4.603 1 ug/L 0.647 0.651 0.663 0.619 0.645 2.5 ug/L 0.611 0.603 0.631 0.649 0.624 5 ug/L 0.645 0.635 0.664 0.625 0.642 10 ug/L* 0.547 0.501 0.537 0,520 0,526* 20 ug/L * 0.342 0,275 0.307 0.2713 0,301* ........... IC25- 12.4 ug/L * - Significantly less than the Control treatment at p <0.05. 6 Pacific Eco-Risk Laboratories 3.2 DELTA-DIABLO EFFLUENT TOXICITY TO Ceriodaphnia dubia. The%survival and the reproduction results of this test are both summarized below in Table 4. Brialy, there was 100%survival at the Control treatment and at all of the effluent concentrations. The resulting NQEC was 100% effluent and the LOEC was> 100%effluent.The EC25 (the effluent concentration at which 5M; of the organisms were"affected",or dead)was also>10017*effluent. The Control treatment females>produced an average of 27.4 offspring during the test. Ceriodaphnia fecundity was not less than 23.4 offspring per female at any of the effluent treatments up through 50%effluent,not-u; of which were significantly less than the Control. At 100% effluent, the mean reproduction was 17.9 offspring per female,;which was significantly less than the Control.The N3EC was at 50170 effluent and the LOEC was 100% effluent. The IC25 was 78.6% effluent. The raw data sheets and the summary of statistical analyses for this test are presented in Appendix C. Fable 4. Effects of Delta-Diablo final effluent on survival and reproduction of Ceriodaphnia dubia. Treatment Survival Reproduction %} I (#neonates/female) Control 100 27.4 6.25 100 2 ,4 12.5% 100 27.1 25% 100 25.7 50% 100 24.1 100% 100 17.9. . ........... ....................... ... ..... ......... ....... No Observable Effect Concentration(NOEC)= 100% effluent 50% effluent Lowest Observable Effect Concentration(LOEQ > 100% effluent 1 1€0%effluent EC15lIC15 >100%effluent 56.5% efiluent EC25/IC25 >100% effluent 78.6%effluent EC401IC40 >100%effluent >100e1'D effluent EC501IC50 >100%effluent >100% effluent TU (100fEC25)— < 1.0 , , �Y r way TU (1001IC25) � S k�2 y j? n �f r.,,!,:. 1.3 5 £? r } Significantly less than the Control treatment at p<0.05. 7 ......... ......... ......... .._..... . ... _ _.. ........... ......... ......... ......... ......... ......... ......... ......... ......... ....... .......... ........ ......... ......... . ........ ......... _ _ ...._ ......_.........__... Pacific Eco-Risk Laboratories 3.2.1 Reference Toxicant Testing with Ceriodaphnia dubia The results of this reference toxicant test are summarized below in Table 5. Briefly,thea was 100% survival at the Control,and not less that 90% at any of the copper treatments up through the 32 ug/L treatment.There was complete mortality at both the 64 and 128 ug/L concentrations. The estimated EC50 value was 42.2 ug/L Cu. As for reproduction,there was a mean of 28.O neonates per female at the Control treatment,and not less than 27.0 offspring per female at copper concentrations up through 16 ug/L.The reproduction NOEC was 16 ug/L and the LOEC was 32 ug/L.The calculated 1C25 value was 28 ug/L Cu. The raw data sheets and the summary of statistical analyses for this test are presented in Appendix D. Table 5.Reference toxicant testing:Effects of copper on survival and reproduction of Cet odaphnia dubia Copper Treatment(ug/L) Survival' I Reproduction (Iv) (#neonates/female) Control 100 28.0 8 ugf L 100 27.9 16 uglL. 90 27.0 32 ug/L* 100 _ 19.0 64 ug/L * 0 128 ug/L 0 * 0 No Observable Effect Concentration(NOEC) - 32 ug/L 16 ug/L Lowest Observable Effect Concentration(LOEC) 64 uglL 32 ug/L EC50- 42.2 u IC2528 ug/L significantly less than the Control treatment at p<0.05. 8 ......... ......... ......... ......... ......... ......... .......................... ......... ......... ......... ._....... ......... ......... ......... ......... ................. ......... . ........ ......... Pacific IEco-Risk Laboratories Table 7. Effects of Delta-Diablo effluent on growth of Fathead Minnows Effluent Mean Fish Dry Weight(mg) Treatment Rep A Rep B step C Rep D Overall Meari Control 0.715 0.632 4.658 0,697 0.676 6.25% 0.856 0.664 0.918 (1,810 0.787 12.5% 0.845 0.852 0.777 0.777 0.813 25% 0.683 0.730 0.718 0.766 0.724 50% 0.791 0.879 0.695 0,7111 43.771 100% 0.861 0.851 0.832 0.878 0.856 No Observable Effect Concentration(NOEC)= 1(X)%effluent Lowest Observable Effect Concentration(LOEC)->100%effluent IC15 > 140%eftluent IC25 > 100%effluent IC40 > 100%effluent IC50 > I(X)%€ffluent TU (1001IC25) G 1.4 10 Pacific Ecru-Risk Laboratories 3.3.1 Reference Toxicant Testing with Fathead Minnows The fish survival results of this test are summarized below in Table 8. Briefly, there was 97.5% survival at the Control treatment, and not less than 85%survival at capper treatments up through 25 ug/L. At 50 ug/L Cu. the survival of the fish dropped to 47.5%which was significantly less than the Control. The survival NOEC was 25 ug/L and the LOEC was 50 ug/L,the calculated EC50 value was 49 ug/L. The fish growth results of this test are summarized below in Table 9. Briefly, the mean fish weight at the Control treatment was 0.682 mg per fish. At the 12.5 ug/L Cu treatment, the mean fish weight was reduced to 0.423 mg, which was significantly less than the Control.The NOEC was 6.25 ug/L and the LOW was 12.5 ug/L; the estimated IC25 was 9.4 ug/L Cu. These ref tox test results are consistent with recent performance of similar ref Lox tests, indicating that these fish were responding in a typical fashion.The raw data sheets and the summary of statistical analyses for this test are pt-esented in Appendix F. Table 8.Reference toxicant testing: Effects of copper on survival of Fathead Minnows. Copper Survival(Clc) TreatmentRepA Rep B Rep C Rep'D 'Mean c/o survival Control 90 100 100 100 ( 97.5 _61.25 ug/L ! 100 100 100, 80 { 95 12.5 ug/L 100 _ 90_ _ 100 70_ 90 25 ug/L, 70 140 80 90 H5 50 ue/L* 80 1 30 60 20 47.5 100 ug/L * 1 20 0 0 10 _ 7.5* No Observable Effect Concentration(NOEC)= 25 ug/L Lowest Observable Effect Concentration(LOEC) 50 ug/L EC50=49 ug/L * Significantly less than the Control treatment at p<0.05. 11 ......... ......... ......... ......... ......... ...........1.111_... _ _ ........................_. ......... ......... ......... ......... ......... ......... ......... ......... ............_.. _..... .__...._. ......... . ........ ......... Pacific Eco-Risk Laboratories Table 9. Ref Tox testing: Effects of upper on growth of Fathead Minnows. Copper Mean Fish Weight(mg) Treatment Rep,A Rep B Rep C Rep D Mean Weight(mg) Control 0.4780.755 0.711 0.774 0.682 6.25 ug/L 0.686 0.671 0.552 0.498 0.602 12.5 ug/L * 0.519 0.480 0.322 0.370 0.423 * 25 us1L* 0.336 0.365 0.404 0.283 0.347 * 50 ug/L 0.254 0.233 0.175 0.165 0.207 100 ug/L 0.200 - 0,140 0.170 No Observable Effect Concentration(NOEL)-61.25 ug/L Lowest Observable Effect Concentration'(LOEC) = 12.5 ug/L IC25'=9.4 ug/l, Significantly less than the Control treatment at p e 0.05. 12 Chronic Toxicity In March 1998,Delta Diablo Sanitation District hired Pacific Eco-Risk Laboratories to perform chronic toxicity evaluations of Discovery Bay effluent. These evaluations consisted of performing the U.S.EPA's freshwater three species short term chronic toxicitytests: 96 hour algal growth test with the green alga Selenasirum capricosrnutum; = three-brood(7 day)survival and reproduction test with the crustacean Ceriodaphnia dubla; 7 day survival and growth test with larval fathead minnows(Pitnephales promelas) The tests were conducted in conformance to guidelines,established by the EPA manual"Short-Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms; (EPA7600l4-911002). The results indicated that the Discovery Bay effluent was not toxic to the green algae or the fathead minnows,however,there was toxicity observed with Ceriodaphnia at the 100%effluent treatment with respect to reproduction. µSurvival _ Growth _ Reraducttulzw _ f)r anism NOEC LOEC �NOEC �LOEC NOEL �LOEC Nay !] ti 11'�} ,i, 010011/0 �351101, ;, Selenastrunr �] ,, �� 1001b %' �yy 1 �? � 1 � keffluenteftlucnt �..nfuxn #., s tS , t� Ceriodaphnia 100% >100fin �j ,, � 50°!0 100% dubia effluent efiluent iH (t� �(�(���j({' �� effluentx{ effluent d....,.... _... a ._. .aa+Slwr « eI.:Y � ]� MW:/`� 1111111; r elaales efflluent efflu nt effluent effluent af; tr,� n r,:*# ��� r: NOEC-'No Observed Effect Concentration _ LOEC-Lowest Observed Effect Concentration Priority Pollutants Discovery Bay effluent was tested for priority pollutants in January and March of 1998. All of the EPA 608,624 and 525 pollutants were below the detection limits. For the metals,only copper and zinc,were above the detection limits,at 0.032 and 0.027 mg1L respectively. Pollutant Result m 1L _... __...... ....__._._r.._.._..... ._.._....._...._......_..__......._.._...._.._.._._..__ .....__.._...,_.. __._ .._....___w .__�._.e regortrng Iuxat...__w._.._ EPA 608 Not detected at or above _- EPA 624 Not detected at or abore rcpomtin ____.....__...,....._.__.._._�....._.,._..._.__ _.._..._......._.... ..........._ ._.. EPA 525 l _.__loot detected at or above rting limit Metals(allexcept those listed below �,_..__...._,~ __.. _.._. Not detected at or above rep limit _ . °1?p..;._.. ___..___....._..... ..._____ ..,..._W._._..._.. .___.. 4,032 Ziac 0.027 Routine Monitoring and Reporting The discharge from the plant has consistently been found to meet or exceed the water quality standards set forth by the regional Water Quality Control Board. DateFlow BOD { TSS TDS Cond Sett PH j Temp. Coli Med L m fL ! m 'L umho/cm in!/L i?c. _ a1iPY1l00 Jan 97 1.111 4.9 1 6.2 1349 16020.0 7.3 16.2 3.2 Feb 97 0,963 1 7.4 7A 1297 1718 0.0 7.1 16.3 2.9 Mar 97 0,989 4.4 6.5 1 00- 1522 0.0 7.0 18.3 fi 2.7 A Sr:97 _µ 0.972 ' 3.79.7 1299 1420 0.0 7.2 18.7 w4� 0.0 M� Mai 97 1 005 2.9_ 418 1291 1373 0.0 � 7_,3� 22.0 0.4 Jun 97 0.999 3.8 3 2 132 1340 _ _7.3 22.3 µ 1.1 Jul 97 1021..w. w. .._.._ 3 6 _1279 129£} _ 0.0 _ ?_2 23.7 0.7_. Au 97 1.042 2.6 5 2 4 z 1257 _ 1330 0.0 7.2 -24,3,-.. 0,0 Sep 97 _ i.015 4.6 ._..__ ? n 125_1 15:50 0.0 7.3 __ X23:9 _0.9 Oct 4.3� I_ _9.1 1300 2224_ 0.0 7.4 21.5 0.2 Nov 97 1 093 29 0F-T5 11.1 rr 1300 2220 0 Q -7".'5" 211.0 0.5 Dec 97 1.053 7.8 ...J_ _1300 2060 0.0 7.6 16.7_ 1.4 Jan 98 1,061 _4 S 7 6 i300 2380 0 } 7.9 16.8 14.9 Feb 98 1.185 6.5... 8.4 13_04 2030 0.0 7.8 16.8 2.6 Mar 98 1.019 7.8_ # �10.9V _ 1300� 2220� 0.0 _7.6_ v 18.1 30.4 Avg 1.035 1 6.4 6.9 1346 1626 0.0 3.3 20.1 4.1 L00/BOOCj 9�II?I �,uI �i�-Q QQ 99TL 90L OT5$i 6b:1+T 96/9T/bo APPENDIX GEOLOGIC 1 SEISMIC REFERENCE MATERIALS _..__... ............ ......... ......... ......... ......... ......... ......... ......... ......... ............... ... ...... ......... ......... . ........ .......... EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION APRIL 19N AND SEWER CONVEYANCE MASTER PLAN APPENDIX 8 Introduction Darwin Myers Associates,reviewgeologists for Contra Costa County,reviewed two geologic reports for lands south of Highway 4 in the Discovery Bay area. The purpose of the review was to access`existing subsurface-data that is relevant to geologic conditions within the 18.6- acre study area. The study are is a property being evaluated by the District for possible use as a site for wastewater treatment facilities. Kleinfelder Report - A preliminary evaluation of foundation conditions south of Highway'4 is provided by a reconnaissance-level geotechnical'investigation performed by J.H.Meinfelder& Associates (Kleinfelder). The report may be identified as follows: Reconnaissance Level Study Proposed Development South of Highway 4 Byron Tract, Contra Costa County Kleinfelder File# 5-1437-21 (Report dated January 23 1986)' The report, which was prepared'for the developer of the Discovery Bay community, was intended to generally characterize foundation conditions. It did not examine potential geologic and seismic hazards in detail: The scope of'Meinfelder's field`exploration work consisted of lagging 31 test pits and six borings: The backhoe test pits were excavated on December 12 1985, to depths varying from 5 to 7.5 feet. The test borings were drilled using truck-mounted continuous flight equipment on December 18 and 20, 1985, to depths varying from approximately 30 to 40 feet. The purpose of the study was to evaluate soil and groundwater conditions for residential development,'but the data gathered is relevant to assessing suitability I of the study area for wastewater treatment facilities. Figure 10 in the Initial Study shows the location of geologic points of observation south of the existing Discovery Bay community. The test pits nearest the study area are labeled B-29 and -30 The logs of these test pits indicate as follows: Test Pit 29(B-23) Test Pit 30 EB-30 0-2 ft Black organic clay/peat 0-1 ft Fill (Black organic silty clay) 2-3 ft Dark gray organic silty 1-3.5 ft Black organic clay and peat 3-6 ft Cray silty clay with rust 3.5-4 ft Gray-mottled'(iron- stains(iron staining?) stained),'silty clay B-1 ... .... . ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ........ ......... ......... ......... ......... ............ ... . ........ ........ .._. DISCOVERY BAY TREATMENT PLANT EXPANSION MMANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1498 APPENDIX B The primary findings of the Meinfelder report are that the occurrence of peaty soils is limited to the upper 5 feet of test pits and borings. In B-29, organic-rich sediments are 3 feet thick; in B-30 organic-rich sediments are up to 3.5 feet thick. Kleinfelder, who were the geotechnical engineers for the Discovery Bay, considered the geologic and soil conditions in that development to be similar to those encountered south of Highway 4. Mark Group Report The Contra Costa Water District constructed a pipeline across the study area that pumps surface waters of Old River to the Los Vaqueros Reservoir. The design work for that pipeline included a geotechnical and geologic study of the pipeline corridor,by the Mark Croup, Inc. (IVIG). The report is titled as follows: Geologic/Geotechnical Investigation Old River Pipeline Project Contra Costa County, California (MG File#90-1148006.SC, report dated Sept. 4, 1992) The scope of the MG report included a thorough review of the geologic and seismic setting of the pipeline route, and flight-auger borings, Cone Penetration Test (CPT) borings, and vane shear tests. Their borings, which were spaced at 1,000 feet+intervals, are shown in Figure 10. Several borings logged by MG are in the immediate vicinity of the study area. Some of the findings of this investigation are as follows: • In the vicinity of the study arm boring.logs indicate peaty material to depths of 2 to 3 feet. The peaty silt is generally loose, dry and has low plasticity. Underlying the peaty material are varying thicknesses of silty and sandy clays, clayey and sandy silts, and miner silty sand layers. The soil profile is characterized by soft clays/loose sands- silts below the peaty material. With increasing depth of<clays become medium stiff, and the sands-silts become dense. Clays and silts are more continuous than the sand lenses. • Due to potential for liquefaction in several areas and the discontinuous nature of sand bodies in the,subsurface, MG estimates settlements caused by liquefaction to range from 0.3 to 3 inches. They also indicate that additional CPT borings and/or rotary borings to evaluation liquefaction potential at specific sites, where more precise estimates of settlement are needed. • A primary product of the MG investigation is a soil profile that attempts to correlate sedimentary units from boring to boring. In the area of RB-2 (which is located in the study area),MG shows no sands were penetrated to the total depth of the baring(51.5 feet). However, several sand lenses that were 2 to 4 feet in thickness were confirmed in borings RB-1 and'RB-4(see Appendix A for the Mark Group profile). B-2 _ _1111.. ......... ......... ......... ......... ......... ........ . 11.11. .. ........__.. ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... . . ._...._.. _........ . ........ ......... EXPANDED INITIAL sn my DISMVERY BAY TREATMENT PLANT EXPANSION APRIL 1998 AND SEWER CONVEYANCE MASTER PLAN APPENDIX B • At the time of the MG investigation, the water table was at a depth of 2 to 7.5 feet below the surface. • According to the MG report, in the near surface shear wave velocities are approximately 400 ft/sec. Velocities rather systematically increasewith depth to approximately 1,200 ft/sec at a depth of 100 feet. A primary product of the MG investigation was an interpretive cross-section that presents interpretation of subsurface conditions along the pipeline corridor. A reduced-scale copy of that section is enclosed for reference purposes(see Figure B1). B-3 .. ...... .... .. .... ....... ... ............................ . . ... ......... .. . ...... . _...._.... DISCOVERY HAY TREATMENT PLANT EXPANSION EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN APRIL 1998 APPENDIX B B-4 ------------------------- Y. wwt {• `�MyrA i it h 4Y 1 w .L 8 ny - yy Z�a'� 4r �w + .Y LA p \1 +: y C.. 4 , 4 OL `ti's \ .e y M g31 ♦ � ev 4-1 C w ie 2 IE 4 " s ebb ; 4 # { APPENDIX C SPECIAL STATUS WILDLIFE HABITAT ASSESSMENT DELTA DIABLO SANITATION DISTRICT PLANT EXPANSION, CONTRA COSTA COUNTY,CALIFORNIA ......... ......... ......... ._....... .._ .................._..._. ....._... ......... ......... ......... ......... ......... ......... ......... ......... _........ . ........ ......... Special-status Wildlife Habitat Assessment, Delta-Diablo Sanitation District Treatment Plant Expansion, Contra Costa County, California Prepared for: Darwin Myers Associates 1308Pine Street;, Martinez, CA 94553 Prepared by: Biasearch Wildlife Surveys P.O. Box 8043 Santa Cruz, CA 95061 20 April 1998 Special-status Wildlife Habitat Assessment, Delta-Diablo Sanitation District Treatment Plant Expansion, Contra Costa County, California INTRODUCTION This document provides a special-status wildlife habitat assessment to assist in the preparation of an Expanded initial Study for a proposed construction project near the Delta-Diablo Water Treatment Plant in southeast Contra Costa County, California. On 31 March and 7 April 1999, reconnaissance-level surveys were performed to characterize wildlife habitats and identify, potential special-status vertebrate species that could be affected by construction of the facility and associated pipeline. Potential impacts resulting from the proposed project are discussed and measures to mitigate impacts are provided. Construction of the facility will affect approximately 6 acres, while the area covered by this assessment covers 18.6 acres. No focused wildlife surveys were conducted as part of this study. EXISTING CONDITIONS The 18-6 acre study area is located in eastern Contra Costa County immediately south of Highway 4 and west of the San Joaquin County line. The site is flat and situated at 10 feet below sea level. The entire site has been used for agricultural purposes in the past, although it appears to have been fallow for some time. The habitats onsite are ruderal and annual grassland. Grasses are dense throughout most of the site and average approximately 12-15 inches in height. Reclamation District 800 Canal is situated along the western edge of the site. This carnal supports freshwater marsh vegetation along its edges and is several feet deep in places. A small drainage canal that parallels Highway 4 is present along the northern edge of the site. A proposed pipeline route runs along the north side of Highway 4 between the roadway and the Discovery Bay subdivision for approximately 1.8 miles. The entire pipeline corridor has been graded and is highly disturbed. The habitat along the pipeline route is either ruderal or has been landscaped. Lands south of the pipeline route, across Highway 4, are currently being used to grow agricultural crops. Adjacent lands to the north and west are currently in row crop production. The Discovery Bay subdivision is situated immediately northwest of the study area. Delta-Diablo Sanitation Plant Expansion 1 Biosearch Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 3 " titt.r 6".++.-:t+anr;rF»yr;t '"" i� .r• ". '' ' <1BP.b.. .. 4 * S`�y Nfseii xta W f �l�ii4lNj %. ,S:' i t '.,. f M 1 yr tit wy £t3 a j.� ♦"'!h:��r ,wwa CE3w. mon r:. ..:..;� e.uw fi.� �,� •$.`� � +,. �•rna ��. k t.% vi rd"" t5�r� Csectew c.,,�•i....� 6.w>.�-- Ys.,r dyryy��'� �,` - _USIF *41 rc <. lk #5+L. f .uNW ",wlM _ SwY 1t Bound 06 d/ 4" '!-; •�s gfi'y. �+�„�. l$11>a4 'YS ffi sonl 3u�a1,ion[ . C �l 7•xa1aY a tR'Y+kM�H i District, `f s Vidd }s L Fn' { t ��� 4 Are ( Reek *yyrrra„ ewwvw» � .y�d t"""` 6y+aolbt J { ryyV ;' Stt )t .;� .•` Some, AUC* f ,r.• are +A,.. LmYww 3 tan+Y tf"5 •`"� nrxvr xr. �S. ',,Qttiffrl * -. firrAy t'{ grlirrrf `. (Woo A,a Sim;k+rptw > IZ a a ,i #� ps•`f,• { •a,S. 7uw+waCmrt -*.wa �. ,14 �" �""\ d: •i •' son. u• ,� w, ,`F �� M>i $o tj ,a # �a,«.a,'c., yes x< x.,Y • .. ...;. IV ig`�F... � �: ww,uw `'�'"b.y... a`M'wrrc S �•aw w#t..: �'�`.; ,d a�, J r� y •trwtw. 'Y Y. k Figure � Regional Setting Map Graphic Scale: 0 1M. 2 Miles E' at; .r . LIO to a r l r/4i/d�o) . sis yr ra' �•� C � y tea ' E ��fFI k st k �' x � �'�i�• 2i I .�- �� ar afi x a Rx V '44, �I fK ..rr.�.rrr.�.rxxr..wrr�w:.a;:st;.:w+cu utttt.:ofnctttttay.,,wr..wxt.:awr.�.rr...y ".xsssuutoctttttttN r.N.n:?:•:•",• ......... ......... :.:rr tp:t ......... ......... ......... ......... ......... ......... ........ . 111.1 ................._.... ......... ............ ....... ....... ......... ......... ......... ......... ..............._. . _._. ........ _........ ......... ......... ......... METHODS A reconnaissance-level survey was conducted on 31 March '1998 by wildlife biologists David Laabs and ]Mark Allaback. 'A ground survey was performed on 7 April 1998 by David Laabs. The entire study area was carefully'inspected. Transects were spaced 100 feet apart. The berm of"the canal located along the west edge of the site was walked.' A portion of the pipeline route was walked. Since this route was between the read and a line of houses and supported no native habitats, most of the 1'.8-mile pipeline route was driven. All vertebrates observed or detected by sign were recorded (Appendix 1). Wildlife habitats were characterized and unique habitat features were identified: Results of previous wildlife surveys conducted in the vicinity of the project site were reviewed to generate a list of special-status wildlife that may inhabit the site. Several monitoring reports from a nearby wetland mitigation area and a constraaints analysis for the Byron Planning Area were reviewed''(Stromberg 1994a, 1994b, 1995, 1995; In Prep.). Three documents prepared by California Department of Fish and Game regarding Species of Special Concern were also used as reference material (Remsen 1978; Williams 1986; Jennings and:Bayes 1990. Special-status wildlife species'include those listed as Threatened and Endangered by the U. S. Fish and Wildlife Service (50 CFR. 17.11), those listed as Proposed (species for which a proposed rule to list as endangered or threatened has been published) and Candidate(species for which the Service has sufficient information to list as endangered or threatened, but for which listing is precluded, formerly Category 1 species) (I.USFWS 1996), those listed as Threatened or Endangered by the California Fish and Game Commission (CDFG 1996), and those listed as Species of Special Concern ;.by the California Department of Fish and Game (CDFG 1998).' In 1996, USFWS` discontinued its Category 2 designation. However, the USFWS remains concerned with these species and may evaluate certain species from the list as more information becomes available. 'A number of species receive federal protection under the Migratory Bird Treaty Act (as listed in 50 CFR. § 10.13). In addition, the Fish & Game Code of California provides protection for birds-of-prey and their nests (§ 3503.5), "fully protected birds" (§,3511), non-game birds (§ 3800), "fully protected mammals (§ 4700), "fully protected reptiles and amphibians (§ 5050)and "fully protected fish" (§ 5515). Based on a literature review and the habitats present in the project area, a list of special- status wildlife species with the potential to inhabit the study area was prepared (Table 1). Nomenclature conforms to AOU (1983, plus supplements) for birds, Jennings (1983) for reptiles and amphibians; and Jones, el al. (1982) for mammals. Special-status invertebrates were not included as part of this assessment. Delta-Diablo Sanitation Plant Expansion 4 Biosearch'Wildlife Surveys' Special-status Wildlife Habitat Assessment 20 April 1998 RESULTS Numerous special-status wildlife species are known from the region(Table l). All>special- status;wildlife species known to inhabit the area or those that have historically been present in southeast Contra Costa County were considered for inclusion in Table 1. After a review of locality records, it was determined that the project site is outside the current range of Alameda whpsnake (Masticophis lateralis euryxanthus). Moreover, no appropriate habitat for Alameda whipsnake is present >onsite. The study area is also outside the current breeding range of least bittern (Ixvbrychus exit s), white-faced ibis (Pl'egadis chihi), long-billed curlew (Numenius;americana) and California least tern (Sterna antillarum browni). Amphibians. The California red-legged ;frog (Rana aurora draytonii), a Federally Threatened species, is known from several locations in the Brushy Creek and Kellogg Creek watersheds (Stromberg 1994b). The closest record appears to be along Brushy Creek where it crosses Armstrong Road, located approximately 4 miles to the southwest (Biosearch Wildlife Surveys 1996). Introduced bullfrogs (Rana catesbeiana), which appear to reduce habitat quality for red-legged frog, are also present in the area. The irrigation canal along the west and north borders of the study area contains marginal habitat for red-legged frog. If red-legged frogs inhabit the canal, they could>forage on the project site. There is no breeding habitat onsite for California% tiger salamander (Ambystoma calij'nrniense), a Federal Candidate species and CDFG Species of Special Concern. The nearest known population appears to be at ',Byron Hot Springs located approximately 4 miles southwest (Stromberg 1994b). The canals adjacent to the site do not provide suitable breeding habitat. The only potential breeding sites in the vicinity are golf course pontis at Discovery Bay. There are relatively few small mammal burrows on the site, although scattered, ground squirrel burrows are present. .However, given the lack of breeding sites in the vicinity, California tiger salamanders are not expected to inhabit the study area. The western spadefoot toad (Scaphiopus hammondii) requires vernal pools or seasonal ponds for breeding. There is no suitable breeding;habitat for this in the study area. The only potential breeding site in the vicinity are at golf course pond ponds at Discovery Bay. Reptiles. The western pond turtle (Clemmys marmoraia), a CDFGr Species of Special Concern, was observed in the drainage canal along i the west edge of the site. The;species likely forages and shelters in the canal and uses it as a movement corridor. Western pond turtles nest in friable soils adjacent to aquatic habitats, sometimes considerable distances from water. The study area may represent suitable nesting habitat for western pond turtles. Birds. The California black rail (Laterallus jamaicensis coturniculus), a State-threatened species, is known from several localities along the Old River and Middle River east and Delta-Diablo Sanitation Plant Expansion 3 Bioseareh Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 ....... ......... ......... ......... ......... .._._._.. _ ....._........ ......... ......... ......... ........ ......... ......... ......... ......... _. ... .......... ........ ......... ......... ......... ......... ..._ ......... ......... northeast of the project site. Although this species can inhabit perennial freshwater marsh habitat, it is found most<often in large expanses of tidally-influenced'wetlands. California black rail is therefore not expected on-site or in the canals bordering the study area, which only supports narrow, fragmented bands of vegetation. Burrowing owl (Athene cunicularia), a CDFG Species of Special Concern, is known from the area. No potential cover-sites for'burrowing owl were present on the study during the site visit on 7 April 1998. However, scattered California ground squirrel (Spec aphil s beecheyi)'_holes, which are frequently used by burrowing owls, were present in patches. The site should be considered foraging habitat for burrowing owl. Additional surveys are required to determine the status of burrowing owls on the study area. Northern harrier (Circus cyuneus) was observed foraging and roosting on the site. The species has nested;;at Byron Airport, and the site contains potential breeding habitat in the tall grass. Focused surveys are required to determine whether this species is present. Several avian species listed in Table 1 require specific micro-habitats for nesting that are not present on-site. Nesting habitat is not present for peregrine falcon (Falco peregrinus), sharp-shinned hawk (Accipiter'striatus), Swainson's hawk (Buten swainsoni), gnat blue heron (Ardea herodias), great egret (Arden alba), white-tailed kite (E'lanus leucur us), golden eagle (Aquila chrysaetos), and long-eared owl'(Asia otos). However, foraging habitat for all of these species is present. Two small trees along the canal to the west of the site could be used by raptors for nesting. There were no nests in these trees during the site visit, although surveys during the peak nesting period are needed to determine the nesting status of raptors on the study area. Three raptor species, ferruginous hawk (Buten regalis),-prairie falcon (Falco mexicanus) and merlin(Falco columbarius), could occupy the study area during the winter months. Mammals. The site is near the northeastern edge of the range of the San Joaquin kit fox (Vulpes acrolis mutica), a Federally Endangered and State-threatened species. Kit fox have been observed on several occasions near the town of Byron. In 1987, two adult kit fox were seen with pups about one mile south of Byron Airport(Palmisano,>pers. comm.). In 1988, a natal den was observed approximately three miles west of Byron (Janes & Stokes 1390). Individual kit fox have been reported near the town of Byron in 1991 and 1993 (Dell 1994). Recent sightings in Round Valley, at the Black Diamond Mine Regional Park, and near the new Vasco Road and Los 'Vaqueros Reservoir area indicate that the species continues to persist in the northern portion of its range (Bell 1992; Getz, Pers. comm.). Currently, there are no potential San Joaquin kit fox dens onsite. However, kit fox forage in a variety of habitats, including those present on-site. The project site is within the range of Townnsend's big-eared bat, mastiff bat, pallid bast, small-footed myotis, long-eared myotis, fringed myotis,' long-legged' myotic and Yuma myosis. No roosting habitat for any of these bat species exists on the site. The study area provides potential foraging habitat for several of these bat species. Delta-Diablo Sanitation Plant Expansion 6 Biosearch Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 Table 1. Special.:-Status Vertebrates vAth the Potential to Inhabit the Delta-Diablo Water Treatment Plan Expansion Study Site in Contra Costa County. Common Name Status Habitat Potential to Inhabit Scientific Mame State/Federal Affinities the Project Area Amphlblaxs California tiger salamander CSC/FC Breed in temporary and semi-permanent ponds-, Low Ambystoma cal fornienm use borrows in grass!"oak savanna Western spadefoot CSC,CP/FSC Breed in temporary pools;aestivate Low Scaphopus hammodii underground in open habitats California red-legged frog CSC,CP/FTBreed in slow creela.ponds and marshes with Moderate Rana aurora draytornll emergent vegetation;use uplands during wet months Reptiles Western pond turtle CSC,CP/FSC Permanent ponds,creeks and rivers;nest Observed in Clemmys marmorata in uplands 400in or more from water canal to west California horned lizard CSC,CP/FSC Grassland,Chaparral;salthnsh and Low Phrynasoma coronatum frontale open riparian areas with sandy soils San Joaquin whipsnake CSC,CP/FSC Dry,open grassland or saltbusr scrub; Low Masticophis flagellum ruddoakt use mammal burrows for refuge Giant garter snake ST,P/Ff Freshwater marshes,streams,canals,irrigated Low Thamnophis gigas rice fields;retreats to willow,cattail,tole vegetation Birds Great blue heron(rookery) SS/- Builds stick nest in dead and live trees Foraging habitat Ardea heradtas often colonial only Great egret(rookery) SS/_ New in large trees;will nest in colonies Foraging habitat Ardea alba with great blue heron only Golden eagle CSC,CFP/- Nest in large trees and cliffs;' Foraging habitat Aguila chrysaetos forage in variety of open habitats only Ferruginous hawk(wintering) CSC/FSC Forage in grasslands during the Moderate Buteo regalis winter;nests outside California SwainsoiA hawk(nesting) ST/- Nest in large trees in riparian woodland; Foraging habitat Buteo swainsonii forage in grassland,cropland only Northern harrier(nesting) CSC/- Nest in marshes,nearby open habitats,usually on observed;nesting Circus cyanms the ground;forage mostly in grasslands habitat present White-tailed kite(nesting) CFP/- Nest in trees;forage in open habitats including Foraging habitat Elanus leucurus agricultural fields;roost colonially at night only Merlin(wintering) CSC/- Winter in grassland,savanna, LOW Falco columbarius woodland;nest outside+California Prairie falcon(nesting) CSC/- Nest in cliffs;forage in Foraging habitat Falco rnexicanus open habitats only American peregrine falcon(nesting) SE,CFP,SS/FE Nest in cliffs,on bridges or buildings; Foraging habitat Falco peregrinus anatum forage in variety of habitats only Western least bittern CSC/FSC Fresh water or brackish marsh;nest on ground Law Ixobrychus exilts hesperis or a mound in cattails,bulrush or tall grass California black rail ST,CFP/FSC Freshwater,brackish and salt marsh,especially Low Rallus famatcensis coturniculus pickleweed;prefer vegetation<3 feet high Greater sandhill crane(nesting&wintering) ST,CFP/- Nag in northeast CA in wet areas near marshes;winter Low Grus canadensis tabi'da in Central Valley in grassland,cropland and wetlands Western snowy plover(nesting,inland) CSC/- Nest along rivers,estuaries,sometimes Low Charadrius alexandrinus nivosus levees and salt ponds;either single or colonial Mountain plover(wintering) CSC/FC Winter in flat grasslands; Low Charadrius montamu nest outside California Short-eared owl(nesting) CSC/- Nest on ground in wet meadows,marshes; Low Asio flammeus forage in open habitats Burrowing owl' CSC/FSC Nest in grasslands,open scrub with suitable Low; Athene cunicularia burrows;can become tolerant to humans California horned lark CSC/- Nest in grasslands that Low Erimophila alpestris actia are short and not dense Loggerhead shrike CSCIFSC Nest in trees and shrubs;forages in open Moderate Lanius ludovicianus habitats;regularly uses took-out perches Tricolored blackbird(nesting) CSC/FSC Nest in colonies in fresh-water marshes Fomginghabitat Agelaius tricolor or dense brambles;forage in grasslands only Delta-Diable Sanitation Plant Expansion 7 Biosearch Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 . ..._... ......... ......... ......... ......... .......1.1.11 ...... ......... ......... ........ ........ ......... ......... ......... ............._........ . . .1.111_... .......... ........ ......... ......... . ........ ......... .1.111. ................. y Table 1 (continued). Special-Status Vertebrates with the Potential to Inhabit the Delta- Diablo elta;D ablo Water Treatment Plan Expansion Study Site in Centra Costa County. Common Name Status Habitat Potential to Inhabit Scientific Name State/Federal Affinities the Project Area mammals Pallid bat CSG- Roots in caves,trees and buildings; Low Antrozous pallidus forages in variety of habitats' Townser0s Western big-eared bat CSC/FSC Roosts in caves;,forages in Low, Corynorhinus townsent*i townsendit variety of habitats small-footed myotic -/FSC, Grassland,oak and pine woodland; IoW Myons cdliolabrum roosts in mine and trees Lang-eared myotis -/FSC Forest habitats;roosts in hollow trees,rock LOW Myosis evotis outcrops,caves and buildings Fringed myotis -/FSC Coniferous and deciduous forests to desert , LOW Myons thysonodes scrub;roosts in caves,trees rock crevices Long-legged myotic -/FSC Variety of habitats;roosts in hallow trees, > LOW Myotis Volans rock crevices,buildings. Yuma myotis(=San Joaquin myotic) CSC/FSG Variety of habitats at lower elevations; LOW Myoris yumanensis roosts in buildings,trees and rock outcrops Western mastiff bat CSC/FSC Roosts in rock crevices,occasionally Low Eumops perosis buildings;forages in open habitats San.Joaquin kit fox ST/FE Grassland,scrub and oak LOW lrulpes macrosis rnutica savanna Status Codes: Status- State SE State-listed as Endangered render California Endangered Species Act(CESA) ST State-listed as Threatened under CESA SCE State candidate for listing as Endangered SCT Stair candidate for listing as Threatened DFG CSC Califbrnia Special Concern species designated by the Department of Fish and Game(DFG) CFP Fully Protected Species under the Fish and Game Code of California Cls Protected species under the California Code of Federal regulations CDF SS Sensitive Species according to the Caii€orn is Department of Forestry and Fire Protection Status Federal FE Federally-listed as Endangered under Federal Endangered Species Act(ESA) FT Federally-listed as Threatened under ESA FPE Federally proposed for listing as Endangered under ESA FC Federal candidate species(former Category l candidates) FSC Federal Special Concern species(former Category 2 candidates) Delta-Diablo Sanitation Plant Expansion 8 Biosearch.Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 IMPACTSAND MITIGATION Impact 1: Impacts to San Joaquin kit fox_, The study area is at the edge of the range for the species. Without additional surveys, it should be considered occupied San Joaquin kit fox habitat due to the proximity of recent sightings and presence of suitable habitat. Development of the project would result in the loss of 6 acres of foraging habitat for the San Joaquin kit fox. The project could result in impacts to kit fox dens if any are created prior to construction, although there were no potential dens in the project footprint on 7 April 1998. Mitigation 1. Mitigation for loss of San Joaquin kit fox habitat Both USFWS and CDFG will be consulted to determine the specific measures appropriate for this project, and whether a Biological Opinion (under Section 7 of the Endangered Species Act), or incidental take permit (under Section 10 of the Act) will be necessary. To compensate for loss of potential San Joaquin kit fax habitat, a habitat preservation area will be established. USFWS will be contacted to determine an appropriate compensation ratio. A habitat management plan will be developed for the habitat preservation area to enhance habitat quality for the kit fox. In order to protect individual kit fox during construction, standard recommendations provided by the USFWS will be followed (USFWS' 1997x). A pre construction survey to identify potential kit fox dens will be completed between 14 and 30 days prior to construction. If any potential dens are located within 100 feet of the project footprint, they will be monitored for three consecutive days to ensure that they are not being used by kit fox, and then excavated fallowing USFWS and CDFG approval. Results of pre- construction surveys will be submitted to USFWS and CDFG within two weeks of completion. Exclusion fencing''(t-posts and nylon'rope) will he erected around the work area to eliminate' direct impacts to surrounding areas. All excavated holes and trenches greater than two feet deep will be covered at night or provided with escape ramps. All pipes and culverts kept overnight on the project site will be inspected prior to work the following day. All food-related trash will be disposed of in closed containers. No firearms or pets will be allowed on the project site. The use of rodenticides and herbicides will be prohibited. An employee education program will be presented to all construction personnel prior to the initiation of work. Any injury to, or death of, a kit fox will be immediately reported to CDFG and USFWS. The above measures will reduce impacts to San Joaquin kit fox to less-than-significant levels. Impact 2; Potential Impacts to California red-legged frog habitat The study area contains upland habitat that may provide potential foraging and sheltering habitat for the California red-legged frog. No breeding habitat is present within the Delta-Diablo Sanitation Plant Expansion 9 Biosearch`Wildlife Surveys Special-status Wildlife Habitat Assessmentpl1998 project area. The Reclamation District canal along the western border of the parcel and the smaller drainage canal along the northern edge provide marginal habitat for the species. Mitigation 2: Mitigation for potential impacts to California red-legged frog habitat The project footprint will be designed to provide a 300-foot buffer between the facility and the canal to avoid potential foraging habitat for red-legged frogs that may inhabit the Reclamation District canal. The project will be constructed using methods that avoid any discharge of sediment into the canal. A pre-construction survey will be carried out within 30 days of construction to ensure that red legged frogs do not inhabit the canal. The survey will be performed according to current protocol that involves two day and two night surveys(USFWS 1997b). The above measures will reduce potential impacts to the red-leggedfrog to a less-than- significant level. Impact 3: Potential Impacts to Giant Garter Snake The Reclamation District canal at the west'boundary of the study area provides'suitable habitat for the giant garter snake. The study area is within historic range of the species, although there are no recent sightings in the vicinity. This species is highly aquatic and is not expected to occupy the remainder of the study area. Mitigation;3: Mitigation for Giant Garter Snake The project will be designed to avoid any impacts to the canal. The project site will be situated'300 feet from the canal and sediment will be controlled. These measures will reduce potential impacts to a less-than-significant level. Impact 4: Impacts to Burrowing Owl Although no burrowing owls or sign was observed during the 7 April> 1998>field visit, the species is known from the vicinity of the study area, and potential burrows were present. The project could result in the loss of b acres of burrowing owl habitat,if they are present. CDFG considers the following activities to be impacts to burrowing owl: disturbance within 50 meters of an occupied burrow(75 meters during the nesting season), destruction of burrows, and destruction of foraging habitat within 100 meters of an occupied burrow.' Mitigation 4: Mitigation for loss of burrowing`owl habitat Prior to construction, a'survey'for burrowing owls and burrows will be performed. The study will follow current CDFG protocol (CDFG 1995) and consist of an initial impact assessment,;and if necessary, surveys on four days at dawn or dusk performed during the peak of breeding season (15 April - 15 July). A buffer zone of 500 feet will also be Delta-Diablo Sanitation Plant Expansion 10 Biosearch Wildlife Surveys Special-status'%ildlife Habitat Assessment 20 April 1998 surveyed, where possible. If burrowing owls are discovered during the pre-construction survey, then passive relocation techniques<will be carried out following; approval ;by CDFG. However, occupied burrows will not be disturbed during the nesting season (1 February-31 August). The above measures will reduce impacts to burrowing owls to a less-than-significant level. Impact 5: Impacts to raptor foraging habitat Development of the project would result in the loss of potential 'foraging habitat for special-status raptors including peregrine falcon, Swanson's hawk; white-tailed kite, northern harrier, short-eared owl, golden eagle, ferruginous hawk,' prairie falcon and merlin. Breeding habitat is not available on the project site for any of these species. The trees to the west of the project site along the canal will be surveyed during the spring to ensure that no raptors are breeding there. Mitigation 5: Mitigation for loss of raptor foraging habitat The loss of 6 acres of foraging habitat is not significant given the abundance of similar habitat in the region. In addition, the lands set aside in Mitigation 1 would provide foraging habitat for the raptors listed above. Impact 6. Impacts to northern harrier nesting habitat Northern harriers were observed several times in the study area during the 7 April field visit. The fallow field provides suitable nesting habitat for the species, which nests on the ground in dense vegetation. Foraging habitat for northern harrier is also available in the study area. Mitigation 6. Mitigation for loss of northern harrier nesting habitat Surveys will be conducted to determine if northern harriers are nesting on the site. Surveys will be conducted three times during the peak breeding season (May — July) within two hours of sunrise. The 6-acre impact area and a 500 foot buffer will be surveyed. If nesting harriers are present, construction will be delayed until after juveniles have fledged. The above measures will reduce impacts to less-than-significant level Impact 7: Impacts to shorebird and wading bird foraging habitat, Development of the project could result in the lass of foraging habitat for special-status shorebirds including mountain plover and long-billed curlew and wading birds including great blue heron, great egret and white-faced ibis. 'Breeding habitat is not available on the project site for any of these species. Delta-Diablo Sanitation Plant Expansion 11 Biosearch Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 __....... ......... ......... ......... ......... ......... _...... .... ........_ ......... ......... ......... ......... ......... ......... ......... ......... ......... .._...... _.._. .......__. ........ ......... ........... ....... ......... Mitigation 7: Mitigation for loss of shorebird and wading bird foraging habitat The lass of 6 acres of foraging habitat is not significant given the abundance of similar habitat in the region. In addition, the lands set aside in Mitigation 1 would provide foraging habitat for the shorebirds and wading birds listed above. Impact S: Impacts to foraging habitat for special-status bats Development of the project will result in the loss of potential»foraging habitat for pallid bat, Townsend's big-eared bat, western mastiffbat, small-footed myotis, long-eared myotis, fringed myotis, long-legged myotis and 'Yuma myotis. No roosting habitat is present on-site for any of these species. Mitigation 8: Mitigation for loss of special-status bat foraging habitat Loss of 6 acres of potential Foraging habitat is not significant given the abundance of similar habitat in the vicinity. In addition, the lands set aside in:Mitigation l would provide foraging habitat for bats listed above. Impact 9 Impacts to western pond turtle Western pond turtles are present in the Reclamation District canal' to the west of the project site. The species is generally restricted to aquatic habitats except during egg- laying. The project footprint provides low quality nesting habitat for western pond turtle. Mitigation 9: Mitigation for western pond turtle The project'footprint will be designed to provide'a 300-foot buffer between the facility and the canal to provide potential nesting habitat for western pond turtles that inhabit the canal. The project will be constructed using methods that avoid any discharge of sediment into the Reclamation District canal. These'actions will reduce impacts to western pond turtle such that they are less-than-significant. Delta-Diablo Sanitation Plant Expansion 12 $iosearch Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 Citations American Ornithologist's Union (AOU). 1983. Checklist of North American birds. 6th Edition(plus Supplements), American t~3rnithologisVs Union, Washington, D.C. Bell, H. M. 1992. San Joaquin kit fox survey and management options for East Bay Regional Park District's Black Diamond Mines Regional Preserve and Round Valley Regional Park. Dated 28 October 1992. Bell,, H. M. 1994. Analysis of Habitat Characteristics of San Joaquin Kit Fox in its Northern Range. M. S. Thesis, California State University, Hayward. California Department of Fish and Came (CDFG). 1998. ;Special Animals. Natural Heritage Division,Natural Diversity Data Base.Dated March 1998. California Department of Fish and Game. 1995. Staff Report on Burrowing Owl Mitigation. Sacramento, CA. California Department of Fish and Game (CDFC). 1996. Endangered and threatened animals of California. Natural Heritage Division, Natural Diversity Data Base. January. Getz„Virginia. Wildlife Biologist. Janes and Stokes Associates, Inc. Sacramento, CA. 1994 and 1996 telephone conversations Jennings, M.R. 1983. An annotated checklist of the amphibians and reptiles of California. California Department of Fish and Game 69(3). 151-171. Jennings , M.R and M.P. Hayes. 1994. Amphibian and reptile species of special concern in California. California Department of Fish and Game Contract # 8023. Jones, J.K., D.C. Carter, H.H. Genoways,R.S. Hoffmann, and D.W. Rice, 1982. Revised checklist of North American mammals north of Mexico. Occasional Papers>of the Museum, Texas Tech University 80: 1-22. Jones and Stokes. 1990. Environmental impact report: Vasco Road and utility relocation project. Draft. (SCH # 89032123.) (JSA 87-031.} Sacramento, CA. Prepared for James M. Montgomery,Consulting Engineers, Inc., Walnut Creek, CA. Palmisano, T. Unit Biologist. California Department of Fish and Game. 1 May 1991 - telephone conversation. Remson, J. V., Jr. 1978. Bird species of special concern in California. Wildlife Management Branch Administrative Report No. 78-1. Delta-Diablo Sanitation Plant Expansion 13 Biosearch Wildlife Surveys Special-status Wildlife Habitat Assessment 20 April 1998 Stromberg, L.P. 1994a. Results of 1993-94 wetland monitoring surveys,;Byron Airport, Contra Costa County, California. San Rafael, CA. Prepared for Manager of Airports, Buchanan and Byron Airports, Concord, CA. 1994b. Biological constraints analysis, Byron planning area, Contra Costa County, California. San Rafael, CA. Prepared for Comprehensive Planning Community Development Department, Martinez, CA. . 1995. Results of 1994-95 wetland monitoring surveys, Byron Airport and Boy's Ranch, Contra Costa County, California. San Rafael, CA. Prepared for Manager of Airports, Buchanan and Byron Airports, Concord, CA. . 1996. Results of 1995-96 wetland monitoring surveys, Byron Airport and Boy's Ranch, Contra Costa County, California. San Rafael, CA. Prepared for Manager of Airports, Buchanan and Byron Airports, Concord, CA. . In prep. Results of 1996-97 wetland monitoring surveys, Byron Airport and Boy's Ranch, Contra Costa County, California. San Rafael, CA. Prepared for Manager of Airports, Buchanan and Byron Airports, Concord, CA. U.S. Fish and Wildlife Service (USFWS). 1996. Endangered and Threatened Plant and Animal Taxa; Proposed Rule. 50 CFR part 17: 7595-7613. February 28, 1996. United States Fish and Wildlife Service (USFWS). 1997a. Standardized recommendations for protection of the San Joaquin kit fox prior to or during ground disturbance. Sacramento, CA. Dated April 1997. United States Fish and Wildlife Service (USFWS). 1997b. U.S. Fish and Wildlife Service Guidance on Site Assessment and Field Surveys for California red-legged frogs. February 18, 1997. Williams, D.F. 1986. Mammalian species of special concern in California. California Department of Fish and Game. 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MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN INTRODUCTION The mitigation measures identified in the Expanded Initial Study would be subject to effective monitoring through the County's normal procedure for processing of applications for planning approvals and construction permits. However,to satisfy the California Public Resources Code, Section 21081.6,a documented record of implementation is required. The purpose of the mitigation monitoring plan is to identify each mitigation;the department(section,or staff position)responsible for enforcement;and the point in the planning/building process where enforcement should occur. This document identifies twelve(12)impacts that require mitigation monitoring. These impacts include: 1)erosion and sedimentation;2)liquefaction; 3)Odors; 4) San Joaquin kit fox; 5)California red-legged frog; 6)giant garter snake; 7)burrowing owl; 8) raptors,shorebird and wading bird, and special status bats; 9)Northern harrier; 10)western pond turtle; 11)construction noise and other construction-related effects; and 12)visual quality. As mitigation measures are implemented,the individual/agency charged with determining compliance signs and dates the monitoring plan. This record of enforcement of the mitigations would be retained in the project file. Although the County is responsible for ensuring that mitigation measures are implemented,they may retain,a consultant to perform specific monitoring-related tasks. This plan has been prepared for adoption at a Public Hearing held before the Contra Costa County Board of Supervisors on June 2, 1998. When cited it should be referred to as follows: Mitigation Monitoring Plan Discovery Bay Treatment Plan Expansion and Sewer Conveyance Master Plan On July 1, 1998 the Contra Costa County Sanitation District No. 19 is scheduled to be dissolved and responsibility for management of the delivery of water and sanitary sewer service in the Sanitation District No. 19 service area is to be transferred to the Discovery Bay Community Services District. Overall responsibility for implementation of the mitigation monitoring plan will rest with the Community Services District after that agency is created. However, it may assign responsibility for determining compliance with specific mitigation measures to representatives of the Delta Diablo Sanitation District or it may assign responsibility to a qualified independent consultant. The mitigation monitoring plan can be kept on the files of the Community Services District or the document can be kept for the CSD in the files of the Delta Diablo Sanitation District. 1 DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN EROSION AND SEDIMENTATION Impact#1: The earthwork necessary for construction of WWTP' facilities in the study area possesses an erosion hazard. Earthwork will be required to create an all-weather service road,as well as constructing wastewater treatment facilities. Figure 4 of the Expanded Initial Study shows various scenarios for improvements south of Highway 4. The layout selected will affect the extent of the graded area. However,the worst case scenario is for disturbance of up to 9 acres of the 18.6-acre study area. Relocation of the sludge lagoon alone would require disturbance of an estimated 5 acres for the facility,including laydown areas,and 1 acre for the service road. Mitigation Measure: For work areas south of Highway 4, the flat slopes and distance to the canal and Highway 4 ditch will mitigate some of the erosionlsedimentation problem, because this intervening agricultural field provides the opportunity to trap sediment. Additional mitigation measures are as follows: i. All grading, excavation and filling shall be conducted during the dry season (April 15 through October 15) only, and all areas of exposed soils shall be replanted to minimize erosion and subsequent sedimentation. After October 15th, only erosion control work shall be allowed. ii. A sediment and soil erosion control plan shall be prepared prior to commencement of construction. The plan shall show the location of proposed temporary detention basins, silt fences and straw bales, along with revegetation of all graded areas. It shall also contain provisions for: 1) Performing maintenance during the winter rainy season, as necessary. 2) Regular inspections by the project engineer during the winter rainy season. 3) Spot inspections during/immediately following severe storms. Implementing Party: Community Services District Timing: Prior to construction and after each major storm during the winter rainy season. Monitoring Actions: Verify that all earthwork is performed during the dry season(April 15 through October 15)only,and only erosion control work performed after October 15th. Other monitoring actions are as follows: ' Wastewater Treatment Plant. 2 MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN • Refer the erosion control plan construction activity SWPPPI, if required,to the Regional Water Quality Control Board,County Building Inspection Department/Grading Section and Flood Control District for technical review and comment prior to start-up of construction. Verify that the erosion control plan is refined in response to the comments. • Document the plant materials(seeds used in the erosion control plan),areas seeded,timing of seeding,application procedures. Non-invasive seed species acceptable to the wildlife biologist for the project shall be utilized. • Document regular inspections by the project engineer during the winter rainy season, spot inspections during/following severe storms. • Document maintenance activities during the winter rainy season as necessary. • Document provisions for bonding erosion control work in the construction contract. Standards for Success: Compliance with the standards/recommendations of the Regional Water Quality Control Board and local NPDES program. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. MCJNI f(!It'S NAM SIGNATURE DA E C(3MMEN.TSiN()TES i 2 SWPP Storm Water Pollution Prevention Plan. 3 DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN LIQUEFACTION impact#2: An earthquake on the Coast Range-Sierra Nevada Border Zone will produce the greatest earthquake effects in the Discovery Bay area. The DBW EIR describes these effects as Modified Mercalli intensities of VIII to IX and peak ground accelerations of up to 0.42 g,depending on the magnitude of the earthquake and other earthquake parameters. The Kleinfelder and Mark Group investigations were not intended to evaluate liquefaction potential of specific building sites within the area south of Highway 4. Nevertheless,the data suggests that sediments within 15 feet of the surface are clayey. Hence,these may be considered a non- liquefiable cap that will separate WWTP facilities from sandy silts and silty,fine-grained sands that may occur at depth. According to the Mark Group,settlement due to liquefaction is anticipated to range from 0.3 to 3 inches for the CCWD pipeline,depending on subsurface conditions at specific locations. However,the details of subsurface conditions must be known for WWTP facilities in the study area to forecast settlement with any degree of certainty. Mitigation Measure: Prior to installation of any WWTP facilities south of Highway 4, the DDSD should authorize preparation of a preliminary geology, soil and foundation report of the areas) where facilities are planned. The report should evaluate geologic, seismic and geotechnical hazards and provide specific criteria to guide grading, drainage and foundation design. Improvement and grading plans shall carry out the recommendations of the approved project. This report shall include evaluation of the potential for liquefaction, seismic settlement, and other types of seismically-induced ground failure by recognized methods appropriate to soil conditions discovered during subsurface exploration. Implementing Party: Community Services District Timin : Prior to Final Design Work for planned wastewater treatment facilities south of Highway 4. Monitoring Actions: The monitor shall provide documentation of a broad-scoped geotechnical investigation that includes 40-foot deep borings, laboratory testing and engineering analysis. The report shall analyze liquefaction potential and provide specific standards and criteria to guide grading, drainage and foundation design. The subsurface exploration program shall utilize CPT borings for at least some of the subsurface work in planned construction areas south of Highway 4. Include evidence of technical review and approval of the geotechnical report by a geotechnical engineer or engineering geologist retained by DDSD. 4 ................. -__............................................................................................................. _ .............................................. MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN Standards for Success: Compliance with the standards/recommendations of Special Publication#117 of the California Division of Mines& Geology for the methodology used in liquefaction analysis. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. MON�'tQR!S1V'AME STGNATUtt ... CCI IMEN SfN©TES i j 5 DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN ODORS Impact #3: Expansion of the treatment plant on the existing WWTP site will result in an increase in odors. The magnitude of this effect is difficult to quantify, but is estimated to be less than the 60 percent increase in emissions. Expansion of the WWTP on the existing site has potential to cause more frequent and more intense odor problems and to expand the number of lots that are impacted by odors. The tee, fairway and green for one of the golf course holes is within 600 feet of the WWTP facilities, so the plant also has the potential to effect the quality of the recreational experience of persons using the golf course,as well as impacting 40 homeowners(or more). Odor increases cannot be trivialized or ignored. It is a cumulative environmental effect that is considered significant in the light of the existing odor problem. It should be noted that odors within treatment plants occur from several varied sources. Emissions from headworks can tend to have a sharp, bitter,or rancid odor. These odors are generally localized and can be minimized by scrubbing the air within the headworks itself. The treatment plant headworks was recently retrofitted with a scrubber unit which should minimize these emissions. Odors associated with sludge lagoon can vary from a fairly light"earthy" odor to the rancid "rotten egg" odors often identified with treatment plants or sewers. The main contributing factor to these odors is a lack of oxygen. When sludge is digested anaerobically (without oxygen),the result is often a hydrogen sulphide smell similar to that generally associated with tidal mud flats. These odors are often mitigated within treatment plants by maintaining a well mixed and aerated zone on top of the sludge lagoon. Until recently,the sludge lagoon at the treatment plant was nearly filled with sludge, making it difficult to maintain an aerated zone on top of the lagoon. In December 1997, 1.2 million gallons of sludge in the lagoon was removed. This has resulted in an improved ability to develop an aerated zone,which should minimize the occurrence of the more offensive odors. Sludge lagoons are not generally covered due to the high cost of covering and scrubbing air from such large areas. Odors from the aerated processes(such as the oxidation ditch)tend to be a moist, "musty" or"earthy" odor. These processes are not as likely to become "upset" resulting in some of the more objectionable odors. These odors are not generally as objectionable to most people as the rotten egg odors (i.e., hydrogen sulphide). Oxidation ditches are also not generally 6 .............. ......... ....._.........111.1 ............................................._....... ..........__.. _... _ _ _ _ ..._....... ..__.... _........ _ _ . MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN covered due to the high cast of covering and scrubbing air from such large areas. In summary, mitigation at the headworks and sludge lagoons can minimize but not eliminate the emission of objectionable©dors,while oxidation ditches are generally not mitigated. The worst odors are generally from the headworks (which has already been mitigated) and the sludge lagoon. Mitigation Measure: The expansion should be accomplished in a manner that will not increase odor to nearby residential properties. This objection cannot be accomplished by the preferred project(i.e., Layout 41), which places all of the new facilities on the existing wastewater treatment plant. Layouts 92, #3 and#4 are capable of mitigating odor impacts. Implementing Party. Board of Supervisors/Community Services District Timing: During the project approval process and prior to Final Design Work for planned wastewater treatment expansion. Monitoring Actions. Verifying that as a minimum the sludge lagoon is relocated south of Highway 4. Alternatively, an environmental impact report shall be required. Standards for Success: No net increase in odors from the exiting wastewater treatment plant property, and the facilities south of State Route 4 at least 900 feet from the nearest residence in the Discovery Bay community. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. 'M0N1T0R'S N,AiME SIGNATURE DATE COMMENTSINC7TES i 1 7 ........................... ...... .................................................. ................................. .............. DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN ..............------- ................................. _........ ......._. ..... ............ ....... ._. . ..._. ........ .. ......... . ......_. _.__. ._._.............. ..... .................................................................... MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION ANIS SEWER CONVEYANCE MASTER PLAN SAN JOAQUIN KIT FOX Impact#4s The study area is at the edge of the range for the kit fox. The study area should be considered occupied by San Joaquin kit fox habitat due to the proximity of recent sightings and presence of appropriate habitat. Assuming only the sludge lagoon is relocated to the study area,the WVVTP project would result in loss of an estimated 6 acres(i.e.,'a sludge lagoon of an estimated 2.5 acres,with an additional 2.5-acre laydown area around the perimeter of the sludge lagoon and 1.0 acre for a maintenance access road). Mitigation Measure: To compensate for the loss of kit fox habitat, a habitat preservation area shall be established. The United States Fish and Wildlife Service (USFWS)shall be contacted to determine an appropriate compensation ratio. A habitat management plant will be developed for the habitat preservation area to enhance habitat quality for the kit fox. Both the USFWS and California Department of Fish and Game (CDFG) will be consulted regarding the specifics of the habitat management plan, and whether a Biological Opinion or incidental take permit will be necessary. Additional or pre-construction surveys shall be performed(14 to 30)prior to construction. If potential dens are located within 100 feet of the project footprint they will be monitored for three consecutive days to ensure that they are not being used by kit fox. Dens that are not occupied can then be excavated,following USFWS and CDFG approval. Results of the pre-construction surveys shall be submitted to USFWS and CDFG within two weeks of completion. Throughout the construction period, all of the following measures are required.' a)exclusion fencing around the perimeter of the work area; b) all excavated holes and trenches greater than two feet deep shall be covered at night or provided with escape ramps; c)all pipes and culverts kept overnight shall be inspected prior to work the following day; d)food-related trash shall be disposed of in closed containers; e)firearms and pets shall not be allowed on the project site;f) use of rodenticides and herbicides shall be prohibited;g)an employee education program shall be presented to field personnel prior to initiation of construction; and h) injury to or death of a kit fox shall be immediately reported to CDFG and USFWS. Im 1p ementing Party: Community Services District Timing: Prior to Final Design Work for planned wastewater treatment facilities south of Highway 4, consultations with regulatory agencies should commence. The habitat preservation area should be established prior to the completion of construction of the WVtWTP expansion, along with a habitat management plan. Monitoring Actions: Verify establishment of a habitat preservation area of suitable size to mitigate loss of an estimated six acres of habitat. Include a U.S. Geological Survey Topographic Map and detail map showing the preservation area. The habitat management plan 9 DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN -- ----------- -- - shall be attached to the mitigation monitoring report. The monitor shall also attach field notes of the biologist performing the pre-construction survey to the monitoring plan. Those notes shall identify the biologist by name and qualifications; date(s) of site visit; time of day/duration of site visit; methodology used and photographs of any significant features. Should evidence of foxes/dens be identified, specific measures to protect foxes shall be provided. The monitor shall also provide documentation of a 1-hour training session for the prime contractor and key field personnel. The documentation shall include date of the training seminar, duration, identify all attendees and their firm; and include an agenda for the seminar. Standards for Success: Compliance with the standards/recommendations of the U.S. Wildlife Service and the Department of Fish and Game. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. i MONITOR'S NAME SIGNATUREDATE COMMENT&NOTES 10 -..................................................... MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN CALIFORNIA RED-LEGGED FROG Impact #5: The study area contains upland habitat that may provide potential foraging and sheltering habitat for the California red-legged frog. No breeding habitat is present within the study area. Mitigation Measure: Wastewater treatment plant facilities(including layout areas) shallbe set back a minimum of 300 feet from to the top-of-bank of the Declamation District 800 canal. The project shall be constructed using methods that avoid discharge of sediment into canal. Implementing Party: Community Services District Tier ' g: Prior to approval of Final Development Plans. Monitoring Actions: The monitor shall verify that final plans provide a 300-foot setback for all permanent and construction-related activities from the canal,and that best management practices are employed to keep construction-related sediment from being discharged into the canal. Standards for Success: Compliance with the standards/protocols of the U.S. Fish and Wildlife Service and the Department of Fish and Game. Monitoring_Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. Mt3NIT012'S 1VAA4E STGNATC ItI� LiAT COMMENTS/N©TES , 1l ........................................... .............................. .............. DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN GIANT GARTER SNAKE Impact #6: The Reclamation District 800 canal at the west boundary of the study area provides marginal habitat for the giant garter snake. The study area is within the historic range of the species. Mitigation Measure: The project shall be designed to avoid impacts to the canal. Wastewater treatment facilities shall be situated 300 feet behind the top-of-bank of the canal, and discharge of sediment into the canal shall be avoided Implementing Party: Community Services District Timing: Prior to approval of Final Development Plans. Monitoring Actions: The monitor shall verify that final plans provide a 300-foot setback from the canal,and that best management practices are employed to keep construction-related sediment from being discharged into the canal. Standards for Success: Compliance with the stand ards/protocols of the U.S. Fish and Wildlife Service and the Department of Fish and Game. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. MONITOR'S NAME . SIGNATURE DATE COMMENTS/NOTES 12 X.X I............ ........ ....................... _.... ............_........... ...._._.._. ......... ......... _ ....................... .... _....._........ .................................. ......__...._. MITIGATION MONITORING PLAN DISCOVERY HAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN BURROWINGOWL Impact##7: Burrowing owls are known from the vicinity of the study area, and potential burrows were present. Construction of wastewater treatment facilities in the study area is anticipated to result in Ioss of an estimated 6 acres of burrowing owl habitat, if they are present. CDFG guidelines consider the following activities to be impacts to burrowing owls: a) disturbance within 50 meters of an occupied burrow(75 meters during the nesting season); b)destruction of burrows; and c)destruction of foraging habitat within 100 meters of an occupied burrow. Mitigation Measure: Prior to construction, a survey for burrowing owls and burrows shall be performed. The study shall adhere to CDFG protocols and consist of an initial impact assessment, and if necessary, surveys on four days at dawn or dusk performed during the peak of breeding season (1 S April- 15 July)! A buffer zone of 500 feet around the perimeter of the site where WWTP facilities are planned will also be surveyed, where possible. If burrowing owls are discovered during the pre-construction survey, then passive relocation techniques will be carried out following approval by CDFG. However, occupied burrows will not be disturbed between I February and 31 August. Implementing Party: Community Services District TiminiY: Pre-construction field surveys to be performed south of Highway 4 approximately 10 to 30 days prior to commencement of construction. Monitoring Actions: The monitor shall attach the field notes of the biologist performing the pre-construction survey to the monitoring plan. Those notes shall identify the biologist by name and qualifications; date(s) of site visit; time of day/duration of site visit; methodology used and photographs of any significant features. Should evidence of owls/burrows be identified, specific measures to protect owls shall be provided by the wildlife biologist and the monitor shall provide documentation that those recommendations are implemented. Standards for Success: Compliance with the standards/protocols of the U.S. Fish and Wildlife Service and the Department of Fish and Game. 13 DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN Monitoring record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. MONITOR'S NAME:.::: SIGNATURI; DATE COMMENTS1t1T01rIaS s E E I 1 E 14 MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN RAPTORS, SHOREBIRD AND WADING BIRD, SPECIAL STATUS BATS Impact#8: Development of wastewater treatment facilities in the study area would result in loss of potential foraging habitat for special-status raptors including peregrine falcon,Swainson's hawk,white-tailed kite, northern harrier,short-eared owl,golden eagle,ferruginous hawk,prairie falcon and merlin. Breeding habitat is not available in the study are for any of these species. The construction of wastewater treatment facilities within a 6-acre portion of the study area could result in the loss of foraging habitat for special-status shorebirds, including mountain plover and longbilled curlew; and wading birds, including great blue heron,great egret and white-faced ibis. Breeding habitat is not available on the project site for any of these species. Development of wastewater treatment facilities in the study area is expected to result in loss of an estimated 6 acres of foraging habitat for pallid bat,Townsend's big-eared bat,western mastiff bat and five species of Myotis. No roosting habitat is present on-site for any of these species. Mitigation Measure: The loss of an estimated 6 acres of foraging'habitat is not significant given the abundance of similar habitat in the region. In addition, the lands set aside in the San Joaquin kit fox mitigation would provide foraging habitat for the raptors and other species listed above. Implementing Party: Community Services District Timm : Prior to completion of construction. Monitoring Actions: Verify establishment of a habitat preservation area of suitable size to mitigate the loss of an estimated six acres(or more)of habitat. Include a U.S.Geological Survey Topographic Map and a detail map showing the kit fox preservation area,along with the habitat management plan. Standards for Success: Compliance with the standards/recommendations of the U.S. Wildlife Service and the Department of Fish and Game. 15 .................................. ..................................... ............ DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. MONITORIS:NAME : SIGNATURE:::: ...DATE COMMENTS/NOTES 16 ............................... MITIGATION MONITORING PLAN DISCOVERY HAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN NORTHERN HARRIER Impact#9: Northern harriers were observed in the study area by BWS' on 7 April, and nesting habitat is available in the study area. Mitigation Measure: Surveys shall be performedthree times during the breeding season within two hours of sunrise to determine if harriers are nesting. If nesting harriers are present, construction shall not commencelresume until the juveniles have fledged Implementing Partvt Community Services District Ti in : Prior to commencement of construction, and at dates selected by the wildlife biologist. Monitoring Actions: The monitor shall attach the field notes of the biologist performing the preconstruction survey to the monitoring plan. These notes shall identify the biologist by name and qualifications; dates of the site visit, time of date/duration of each visit, map showing the area surveyed; methodology used and photographs of any significant features. Should evidence of nesting Norther Harriers be identified, the monitor shall document the date that fledging occurs and verify that construction has not commenced/resumed prior to that date. Standards for Success: Construction activities that comply with the recommendations of the wildlife biologist'. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. ME3NI16R'S NAME > SIGNA7FU E DATE: COMMENTS S" a SWS=Biosearch Wildlife Surveys,consulting wildlife biologists. 17 ........... ........ ........... DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN WESTERN POND TURTLE Impact #10: Western pond turtles are present in the canal to the west of the study area. The species is generally restricted to aquatic habitats except during egg- laying. The potential site for wastewater treatment facilities, as shown in Figure 11 of the Expanded Initial Study, provides low quality nesting sites for western pond turtle. Mitigation Measure: The project footprint provides a 300 foot wide buffer between the facilities and the east bank of the canal. This buffer provides potential habitat for western pond turtle. Moreover, the erosion control measures incorporated into the project will avoid discharge of sediment into the Reclamation District 800 canal. Impiementing-Par&: Community Services District Timin : Prior to Final Design and during initial phases of construction. Monitoring Actigns: Verify that the design of wastewater treatment facilities south of Highway 4 are setback from the canal and will not encroach on the 300-foot wide buffer. The only exception to this general standard is for the service road and associated pipeline(s). The road and pipeline alignment are controlled by requirements of CalTrans. Any road or pipeline encroachments into the 300-foot wide buffer shall be kept to a practical minimue and shall be subject to review by the wildlife biologist. Any recommendations of the wildlife biologist shall be incorporated into the Final Design. Prior to the start-up of construction. survey stakes, construction fencing, and signage will be established at the east edge of the buffer to prevent inadvertent access by construction workers and equipment. Standards for Success: Construction activities that comply with the recommendations of the wildlife biologist. The location of the intersection of the service road with State Route 4 would be subject to consultation with CalTrans to assure that potential traffic safety problems are avoided/minimized. The monitoring action recognizes that the location selected may encroach into the buffer zone, 18 MITIGATION MONITORING PLAN DISCOVERY SAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN MonitoringRecord: Steps to implement the monitoring actions are to be signed off and dated by the monitor. Iti�UNITUR`S NA.NIIE' SIGNATURE DATE COMM>aNTatNUTIaS: E 19 DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN CONSTRUCTION NOISE AND OTHER CONSTRUCTION-RELATED EFFECTS Impact#11: Figures b,7 and 8 of the Expanded Initial Study identify specific areas where the Sewer Conveyance Master Plan show construction of mains and lift stations within Discovery Bay.This work involves sawing of pavement; backhoes,dump trucks and flat bed trucks would be utilized to excavate trenches and haul construction materials; and noisy equipment is needed to backfill trenches and repave disturbed areas. These construction activities generate significant noise during the construction period. They also generate vibrations,dust and can interfere with parking on the residential street,as well as conflicting with driveway access to private lots. These are significant construction-related effects. Mitigation Measure: All of the following measures are required to mitigate noise and associated construction-related problems in the existing Discovery Bay community. i. Noise generating construction activities, including such things as power generators, shall be limited to the hours of 8:00 AM to 5:00 PM, Monday through Friday, and shall be prohibited on weekends, as well as state and federal holidays. i"i. DDSD shall require their contractors and subcontractors to fit all internal combustion engines with mufflers which are in good condition. iii. At least one week prior to commencement of grading, the applicant shall post the site and mad to the owners of property within 300 feet of work areas notice that construction work will commence. The notice shall include a list of contact persons with name, title,phone number and area of responsibility. The person responsible for maintaining the list shall be included. The list shall be kept current at all times and shall consist of persons with authority to indicate and implement corrective action in their area of responsibility. The names of individuals responsible for noise, dust and litter control, tree protection, construction traffic and vehicles, erosion control, and the .24-hour emergency number, shall be expressly identified in the notice. The notice shall be re-issued with each phase of construction activity. A copy of the notice shall be kept on file by DDSD, accompanied by a list of the names and addresses of the property owners noticed, and a map identifying the area noticed. iv. The contractor shall submit a dust and litter control program for the review and approval of DDSD. Any violation of the approved program shall require an 20 MITIGATION MONITORING PLAN DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN immediate work stoppage. Construction work shall not be allowed to resume until, if necessary, an appropriate construction bond has been posted. v. The contractor shall make a good-faith effort to avoid interference with existing neighborhood traffic flows. This shall include provision for monitoring and controlling areas in which to park construction equipment and the commute vehicles of construction crews. vi. Transporting of heavy equipment and trucks shall be limited to weekdays between the hours of 8 AM and 5 PM. vii. Within work areas along roads,for safety, one lane must be kept open. viii.The site shall be maintained in an orderly fashion. Following the cessation of construction activity, all construction debris shall be removed from the site. ImWementing Party: Community Services District Tom; Prior to mailing of construction documents to potential contractors, during review of submittal of the contractor, and during monitoring of compliance during all construction phases. Moriitering .Arttons: The following monitoring actions correspond to the eight components of the mitigation measure. i. Plans and construction documents to specify the hours of noise generating activities within and adjacent to the existing Discovery Bay community. The contract shall specify that the job can be shut down to resolve noise-related and construction-related problems at the contractors expense. ii. The construction contract shall provide for removing equipment and internal combustion engines from the job, if mufflers are not in good condition. iii. Attach the notice sent to neighbors, along with a copy of the distribution list, to the mitigation monitoring plan. Renotice for each new construction phase. (The report of Carollo Engineers currently identifies five construction phases.) iv. Verify submittal of the dust and litter program prepared by the contractor and attach it to the mitigation monitoring plan. V. The construction contract should require the contractor to address how parking of commute vehicles of employees, parking of construction vehicles and storage of construction materials will be handled. It should also identify any detour routes and 21 DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PIAN AND SEWER CONVEYANCE MASTER PLAN explain other traffic control measures (e.g., flagging of traffic through active construction areas). vi. For occasions where trucks arrive before 8 am (or after 5 pm), the contractor should identify a location where trucks can safely stand-by that is outside of residential areas. Verify that the job can be shut down to resolve construction-related problems at the contractors expense. vii. The contractor can be allowed to detour through traffic, but one lane must be kept open for local traffic and emergency vehicle access. The monitor shall verify language to this effect in the contract and make random inspections of traffic flow through residential streets during construction. viii. Verify that the construction contract provides for inspection at the end of each phase of work. Final payments to the contractor shall be withheld until it is verified that the site has been properly closed and all construction debris removed. Standards for Success: Compliance with the normal construction standards of the Delta Diablo Sanitation.District/County Public Works DepartmentlCalTrans. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. MOIVITOTt'S NAME SIGNATURE DATE: COMMENTS/NOTES 22 MITIGATION MONITORING PLAN DISCOVERY DAY TREATMENT PLANT EXPANSION AND SEWER CONVEYANCE MASTER PLAN VISUAL QUALITY Impact#112: The construction of lift stations on residential lots creates land use compatibility,visual compatibility,odor and noise problems. Cumulatively,these effects are a significant impact. Figure 16 of the Expanded Initial Study,Views F and G, illustrates alternative sites for lift stations. View F is looking across Newport Drive at existing water well No. 4. Carollo Engineers has suggested that PS "i" could be constructed within the boundaries of this DDSD site. View G is looking southeast within the Centex project. Lift station PS"S" is enclosed by a wood wall that is 6 feet high. This facility is located on the edge of a neighborhood park. Below-ground lift stations can serve to minimize aesthetic impacts and, according to DDSD staff,they will be used when feasible, but they do not completely mitigate the identified impacts. Mitigation Measure: Within Discovery Bay West, lift stations should be sited outside of residential lots. Potential locations include the parkland areas adjacent to the proposed real estate lakes or along the Bixler Road frontage of DBW For parkland sites, a landscape and irrigation plan is required to screen the site. The plan shall be submitted for review and approval of the County Zoning Administrator, who is charged with responsibility for review and approval o,f the landscape plans for the parkland area in the DBW development. The plan shall respond to the following: i. Be prepared by a licensed landscape architect and shall be certified to be in compliance with the County Water Conservation Ordinance. ii. California native, drought-tolerant plants shall be used as much as possible. All trees shall be a minimum of 25 gallons, and all shrubs shall be'a minimum of 5 gallon sizes. iii. Provisions shall be made to guarantee long-term maintenance of the plant materials and irrigation system. iv. Provision shall be made for fencing the lift station, where necessary. p e ;tenting Party: Contra Costa County Community Development Department Timing:: D7uring review of final subdivision maps, prior to issuance of construction permits, and during buildout of each phase of Discovery Bay West. Monitoring Actions: The project proponent shall submit a plan that provides evidence of a design which responds to the mitigation measure, for review by the County Zoning Administrator. The monitor shall attach the plan for lift stations, including landscaping and any fencing, to the mitigation monitoring plan. The monitor shall also verify that construction, 23 .............I................1.11..........I.............''I'll'...,...........-.1-..................................... DISCOVERY BAY TREATMENT PLANT EXPANSION MITIGATION MONITORING PLAN AND SEWER CONVEYANCE MASTER PLAN along with provision for long-term maintenance of landscape plants, is implemented during the project approval and development process. Standards for Success: Lift stations that are all located outside of private residential lots, and lift stations landscaped and fenced as needed to screenviews of the facility and provide any needed security. Monitoring Record: Steps to implement the monitoring actions are to be signed off and dated by the monitor. 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I"I 11.11.I 111. 11.11 I..I I .I., I 1-11. ''I ...'' I I I � I I .l . I.., ''I I I-- I ., I'll I 11 1. I - , , ' ' .1., ''I �11....... ,-, ''.- 1. , I.- ... ''. ''. ..-I. ,.1. I . I I ,I . I I I 1, '' . . . '. 11 ,.'' .. '. - 1. 11 I 11 I 11.1 I 11 1. 11 ''I''.I '---- I-- ..''. ..,.- I I'll I..'', � �I I I . 1111 . I- - 11 -11111 --l-1- - l '.. -I. ....... I..''. - I -.1.... I... ..I. .. 1''... I .1 11 I - I . '' . ''. 1 . . . 1 . I I 1. 11 I I . 1. 1 11 CORRESPONDENCE ON EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION AND SEWER.CONVEYANCE MASTER.PLAN As of May 26, 1998 the County had received seven comment letters on the Expanded Initial Study. The letters, which are enclosed, were submitted by the following organizations and individuals: 1. Discovery Bay Property Owners Association,Inc. (dated May 4, 1998) 2. John H. Low, 2771 Cherry Hills Dr.,Discovery(dated May 5, 1998) 3. Gary J. Hess,Discovery Bay(dated May 11, 1998;Hess Letter#1) 4. Gary J. Hess,Discovery Bay(Hess Letter 42) 5. Gary J. Hess, Discovery Bay(Hess Letter#3) 6. Gary J. Hess, Discovery Bay(Hess Letter#4) 7. Reclamation District 800 BACKGROUND The correspondence identifies issues and concerns of those commenting on the project. They also address the consultation process with the community and discuss the Expanded Initial Study. The following discussion is limited to providing comments which pertain directly to the adequacy of the Expanded Initial Study, RESPONSE TO LETTERS 1. Discovery Bay Property Owners Association,Inc. The comment recommends a full EIR for the project to analyze: a) odors that would come with expansion; and b)a need to determine what harmful ingredients, if any, are in the air. In response to Comment a), the Expanded Initial Study has identified odors as a significant impact and a mitigation measure has been proposed to prevent odors from increasing. With regard to Comment b), the wastewater treatment plant has a permit from the Bay Area Air Quality Management District(BAAQMD). Records of the BAAQMD indicate that the wastewater treatment plant is in compliance with permit requirements. There are odors associated with all treatment plants in Contra Costa County. Whenever sensitive uses(e.g.,golf courses and residence) are constructed adjacent to treatment plants, land use compatibility problems!result. There is no scientific evidence that the odors equate to health-related problems. Specifically,the State Health Department and the County Health Services Department have responsibilities for protection of public health. Neither agency has identified health problems associated with gaseous emissions from wastewater treatment plants. 1 _ ......... ......... ......... ......... ......... .......11.1.1............................................. ......... ......... ......._. . ....... . DISCOVERY BAY TREATMENT PLANT EXPANSION CORRESPONDENCE ON EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN MAY 1998 It should be recognized that gaseous emissions from wastewater facilities have been subject to measurement,modeling and scientific/engineering analysis of the physical-chemical processes!-'An evolving body of knowledge exists on sources of odors and strategies to control odors. These studies have not confirmed significant health-related problems. It therefore appears speculative to infer that expansion of the Discovery Bay WWTP poses a public health problem. According to CEQA, Section 15145, once an agency finds that a particular effect is too speculative for evaluation, discussion of that effect should be terminated by the lead agency. 2. John H. Low The thrust of Mr. Low's comments are that odors and perceived health problems associated with the plant have increased over the years, and that increasing the plant will significantly aggravate an existing serious problem. Mr. Low also notes other problems confronting Discovery Bay property owners—a lack of sufficient water wells and deficiencies of Highway 4 to carry existing traffic. In response,the Expanded Initial Study shares Mr.Low's view that any increase in odors constitutes a significant impact(see Expanded Initial Study, p. 40): Odor increases cannot be trivialized or ignored It is a cumulative environmental effect that is considered significant in the light of the existing odor problem. Implementation of mitigation measures identified in the Expanded Initial Study will reduce the potential for project-related impacts to a less than significant level. With regard to the other issues raised by Mr. Low,the responsibility of the Expanded Initial Study is to analyze the potential impacts of the proposed project. It is not charged with responsibility for analyses of existing problems, and it is not the responsibility of the project to solve existing problems. The major policy decision for expanding the capacity of the WWTP occurred in July, 1995 when the Final EIR for Discovery Bay West was certified by the Board of Supervisors. This action immediately preceded approval of the Discovery Bay West General Plan Amendment, Rezoning and associated Development Plan. 3. Gary J.Hess(Letter#1) Mr.Hess raised a number of concerns regarding the design of the planned facilities. Those questions are answered below. The questions and associated responses provide clarifying information, but they do not change the assessment of environmental impacts presented in the Expanded Initial Study. ' Dawson, D.S.and W.L. Beyerlein, 1996, "Gaseous Emissions from Wastewater Facilities" in Water Environment Research, Vol. 68,No.4, p. 510-515. z USEPA, 1981.potential Health Effects from Viable Emissions and Toxins Associated with Wastewater Treatment Plants and Land Application Sites, Project Summary, EPA-6001SI-81-006, April. 2 CORRESPONDENCE ON EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION MAY 1998 AND SEWER CONVEYANCE MASTER PLAN For convenience and clarity the comments of Mr.Hess are assigned a Raman numeral,and a point- by-point response is presented below: i. The comment addresses the noticing of informational meetings,and not the adequacy of the Expanded Initial Study. ii. The rating system of Metcalf&Eddy,Inc. is discussed,on page 5 of the Expanders Initial Study.The three-fold classification is based on BOY and TSS'concentrations. Increasing plant capacity does not imply any change in these concentrations. iii. The comment cites the criteria designed to size plant facilities. These criteria are presented in the report issued by Carollo Engineers titled: Delta Diablo Sanitation District Discovery Bay Wastewater Treatment Plant Expansion Treatment Analysis (report dated April 1998) The commenter will find technical data that was the basis of the design in that report. iv. When the Discovery Bay West EIR was prepared the volume of wastewater was calculated for the Discovery Bay West {DBW} project and cumulative flows at buildout of the Discovery Bay West project, along with buildout of the Centex (Albers) and Byron 78 projects. These projected flows,in combination with flows from the existing Discovery Bay community,necessitate expansion of the Discovery Say Wastewater Treatment flan. At the time that the DBW EIR was prepared and certified,the details of the sizing and location of pipes, lift stations and associated treatment plant facilities had .not been designed. (Nevertheless, the need for these facilities was identified by the DBW EIR. Subsequent to certification of the EIR,the 1,089-acre Discovery Bay West project area was annexed into Contra Costa County,Sanitation District No. 19. The Expanded Initial.Study analyzed the potential for environmental impacts associated with the construction project and the incremental impact associated with operation of the expanded facilities. The DBW EIR analyzed collection and treatment system improvements on a level appropriate for the planning approvals being requested at that time. V. The northeast edge of the new oxidation ditch will be 285 feet from the fence that separates the treatment plant from Cherry Hills Drive.The northwest edge of the oxidation ditch will be approximately 50 feet to the fence. The closest property will be approximately 270 feet from the nearest treatment unit,which is the new oxidation ditch. Under layouts 2, 3 and 3 Five-day,20'C biochemical.oxygen demand. ° Total suspended solids. 3 11 ........ ......... ......... ......... ......... ......... ... ._.._.............. ......... ......... .......... ....... DISCOVERY BAY TREATMENT PLANT EXPANSION CORRESPONDENCE ON EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN MAY 1998 4, the treatment facilities will not be located closer to the existing residences than the existing condition. Vi. The comment incorrectly assumes that the sludge lagoon will change substantially in size. The Expanded Initial Study shows a minor modification to the existing lagoon consisting of an interior baffle. Vii. Carollo Engineers prepared the report under the terms of its contract with the Delta Diablo Sanitation District. Copies of this report have been provided to Contra Costa County Public Works Department and were made available to the public on request at the document review locations identified on the Notice of Public Review and Intent to Adopt a proposed Mitigated Negative Declaration. viii. The facilities are designed only to serve lands within S.D.No. 19(see Figure 2 for a map of the Iands in the District). The lot yield that was the basis for the design is presented in Table I (see page 5 of the Expanded Initial Study). The Expanded Initial Study analyzed the potential impacts associated with the expansion of the WWTP and associated conveyance system. These infrastructure facilities are needed to serve the Discovery Bay West project, which was previously approved. ix. Project proponents are subject to payment of applicable fees. The fees are paid to the District,and not a developer. X. Some preliminary consultations have occurred to discuss issues of concern and expectations of the Regional Water Quality Control Board. xi. The first step in the expansion process was to complete preliminary design work and perform necessary CEQA-required assessments. The next step is to obtain approval from the Directors of S.D.No. 19. They have responsibility for adopting the Mitigated Negative Declaration or requesting additional environmental documentation; and for authorizing DDSD to proceed with permitting and final design work for a specific expansion project. xii. Discovery Bay West is projected to generate a total flow of 0.66 mgd at buildout. The total flow at buildout of all lands that are within the boundaries of SD No. 19 is 2.03 mgd. Table 1 of the Expanded Initial Study indicates peak cumulative flows will be 6.09 mgd. Of this total,Discovery Bay West contributes 1.85 mgd.Thus,the Discovery Bay West project will contribute approximately 30 percent of the cumulative peak flow carried by the plant after expansion. The hypothesis that emissions from the WWTP will be linearly related to plant capacity isnot correct. Moreover,for Layouts 2, 3 and 4, plant facilities are sited south of Highway 4, at a location farther from sensitive receptors. xiii. The number of complaints reported to BAAQMD were reported in the Expanded Initial Study. The Expanded Initial Study also refers to "other occasions" as the times when property owners may have noticed an odor but did not file a complaint with BAAQMD. The 4 CORRESPONDENCE ON EXPANDED INITIAL STUDY DISCOVERY HAY TREATMENT PLANT EXPANSION MAY 1998 AND SEWER CONVEYANCE MASTER PLAN comments of Mr. Hess at the May 6th Discovery Bay MAC meeting may have misled the audience. Specifically, Mr. Hess claimed to have documentation of odor complaints associated with the wastewater treatment plant. However,the supporting documentation that was provided was titled "water complaints xiv. The Federal Environmental Protection Agency published research on the potential health effects associated with wastewater treatment plants and land application sites(Majeti and Clark, 1981). Specifically, the study focused on the potential for airborne pathogens and toxins to affect workers at wastewater treatment plants (and populations living in the vicinity). The resulting epidemiological studies did not document any correlation between exposure of the workers and incidence of disease. No adverse health effects were confirmed. xv. The Expanded Initial Study does not mention the need to use special breathing apparatus and protective gear when treating an enclosed facility. xvi. See responses to the second comment of John H. Low. xvii. The District selected its preferred plan at the time that Carollo Engineers were retained to perform the preliminary,design study. However,the District authorized its consultant to examine a broad range of options. The preferred alternative looks at the efficient operation of the wastewater treatment plant, safety of plant employees,as well as the opportunity to mitigate impacts of the plant expansion. The four layouts referenced by Mr. Hess will be considered by the Board of Supervisors. xviii. The comment provides data on the number of children that have been diagnosed as autistic in Discovery Bay, suggesting a potential link to the treatment plant. The comment is acknowledged,but association of autism and the treatment plant is speculative,and CEQA Section 15145 indicates that environmental documents need not engage in speculation. 4. Gar.J.mess(Letter#2) Mr. Hess questions the long range planning efforts of the County for delivery of water and wastewater services, especially in the East County area... The letter also questions the approval of the proposed expansion of the Discovery Bay Wastewater Treatment Plant(WWTP). In response, the long range planning of the County is included in General Plan goals and policies,contained in the Public Facilities/Public Services Element. The attached General Plan goals and policies are from that General Plan Element(see goals and policies on following page). The comments of Mr. Hess address the planning process and not the adequacy of the Expanded Initial Study. Nevertheless, it should be noted that the subject before the Board of Supervisors, in their capacity as Directors of S.D.No. 19, is not whether to expand the Discovery Bay WWTP, but is the Expanded Initial Study adequate, and provide authorization for the Delta Diablo Sanitation 5 _... _..... ....... .. ......... ......... ......... ......... ......... ......... ......._. ...._.__. __......_...._... ........... _ ......... _...._.. DISCOVERY BAY TREATMENT PLANT EXPANSION CORRESPONDENCE ON EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN MAY 1998 District to proceed with final design and permitting of one of the layouts analyzed by the Expanded Initial Study. (The policy-related issues associated with delivery of wastewater services to Discovery Bay West were addressed at the time of approval of the DB West General Plan Amendment,Rezoning and associated Development Plan,in 1995. Subsequently,the 1,089-acre DB West site was annexed into Sanitation District No. 19. The DB West EIR established the wastewater flows to be generated by DB West at buildout of that project; and it discusses the design of the existing Discovery Bay WWTP on page 4.8-6 and 4.8-7. The impact/mitigation associated with the demand for wastewater treatment is presented on page 4.8-17 through 4.8-18, including Tables 4.8-8 and 4.8-9. The mitigation measure calls for annexation of the DB West project to Sanitation District No. 19 and for expansion of the WWTP to provide the necessary capacity to treat the increased flows.) 5. Gary J.Hess(Letter#3) Mr. Hess suggests that the Initial Study was remiss in not contacting Discovery Bay residents about health-related problems. He goes on to suggest a possible relationship between the number of children diagnosed with autism and the WWTP, but no evidence linking the treatment plant with autism (or other health problems) is provided. Additionally, Mr. Hess requests a focused Environmental Impact Report as a mechanism to test for airborne pathogens, bacterial emissions or toxic emissions from the oxidation ditch,clarificrs and sludge lagoon,and he supports an alternative that would relocate the entire WWTP to the south side of Highway 4. In response,the CEQA thresholds of significance for health hazards are contained in Appendix G (v). According to this section of CEQA,a significant impact is one which"creates a potential health hazard or involves the use, production or disposal of materials which pose a hazard to people or animals or plant populations in the area affected". The EPA, State Health Department and County Health Services Department have various standards and regulations that are intended to protect public health. These agencies have not documented a public health hazard associated with airborne pathogens at wastewater treatment plants. Consequently there are no adopted sampling protocols or standards for the chain of custody or for concentration of pathogens. Thus air sampling in the residential neighborhood west of the Discovery Bay WWTP could conceivably generate scientific data, but the translation of the data into an impact could not be based on objective standards. It should also be recognized that there are no standards for the buffer zone needed for wastewater treatment plants. The largest WWTP in Contra Costa County is the Central Contra Costa Sanitation District plant. This facility has a capacity of 35 mgd and is approximately 1,000 feet from the nearest residences. The Rodeo Sanitation District is responsible for collection and treatment of wastewater in Rodeo. The plant has a design capacity of1.14 mgd,and serves approximately 3,000 residential and commercial customers. That plant is approximately 800 feet from the nearest residential lot. Because that facility is located on the edge of San Pablo Bay, odors are rarely a problem because of the prevailing winds. 6 CORRESPONDENCE ON EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION MAY 1999 AND SEWER CONVEYANCE MASTED PLAN Contra: Costa County General Flan: 1995-2010 SEWER'SERVICE GOALS 7-K To provide sewer collection, treatment and disposal facilities adequate to meet the current and projected needs of existing and future residents. 7-L To provide wastewater treattnertt fat preserva,and to the extent feasible,enhances water quality and the natural environment. 7-X To develop wastewater reclamation as a supplement to imported surface water supplies. 7-ld. To assure that new development pays the costs related to tate need for increased sewer system capacity. SEWER SERVICE POLICIES 7-29. Sewer treatment facilities shall be required to operate in compliance with waste discharge requirements established by the California Regional Water Quality Control Board. Development that would result in the violation of waste discharge requirements shall not be approved. 7-30. Sewer service agencies shall be encouraged to establish service boundaries and develop treatment facilities to meet fixture service needs based on the growth policies contained in the County and cities' General plans. 7-31. urian doveU p pent Aiall be encouraged within the sewer Spheres of Influence adopted by the Local Agency Formation Commission. Expansion into new areas within the Urban Limit line but beyond the Spheres of Inthtenoe Aould be restricted to thou areas where urban development'can meet growth management standards included in this General plan. 7-32. Development of rural residerim,or other uses,that will be served by septic tank and ieachfields,shall be discouraged in areas with high groundwater levels or soils with poor percolation characteristics. 7-33. At the project approval stage, the County shall require new development to demonstrate that wastewater treatment capacity can be provided. The County shall determine whether(I)capacity exists within the wastewater treatment systent if a development project is built within a set period of i time,or(2)capacity will be provided by a funded program or outer mechanism.. This finding will be based on inkrinittion furnished or mule available to the County from consultations with the appropriate water agency,the applicant,or other sources. 7.34. For Retire sewer facilities that may be rem, appropriate land areas in the County shall be designated consistent with other policies in the General plan. 7.35. OPPWtimities for using reclaimed wastewater shall be identified and developed in cooperation with sewer service and water service agencies. 7-36. Ilcsteficial uses of treated wastewater including marsh enhancement and agricultural irrigation shall be encouraged.Such wastewater reclamation conte shall be incorporated into resource management prW grama and land use planting. 737. no need for sewer system improvements shall be reduced by requiring new development to incorpgrate water conservation measures which reduce flows into the sanitary sewer system. DISCOVERY BAY TREATMENT PLANT EXPANSION CORRESPONDENCE ON EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN MAY 1998 6. Gary J.Hess{Letter#4} This letter paraphrases the Expanded Initial Study,and goes on to recommend Layout#4 as the best solution to problems associated with the existing WWTP. In response, the task of the Expanded Initial Study was to identify impacts and mitigation measures associated with the expansion of the Discovery Bay WWTP. Mr.Hess is recommending a solution that is intended to mitigate an existing problem. Mitigation of existing problems isnot the responsibility of the project. Consequently, CEQA cannot be used to justify relocation of the entire WWTP to a new site. 7. Reclamation District 800 The comment from the District addresses the need for a formal agreement with Reclamation District 800. It does not comment on the adequacy of the Expanded Initial Study. 8 H E C E+Ii Y E D MAY c] 1938 °. A ° P. C3. Box 666 • Byrom CA 94514 • (510)634-?583 • FAX 1510)634-5532 May 4, 1998 Supervisor Joe Canciamiila District '; 335 East Leland Road,Suite 1,0 Pittsburg, CA 94353 Dear supervisor Canc;iamilla: The Association represents more than 1,500 properties and their owners in Discovery Bay. It has come to our attention that the sewer plant in Discovery Bay is being cniarged from 1.3 million gallons Per day (MGD) to 2.3 IMOD. Several of our residents who are members of our .Association are concerned about the smell increasing when they play golf. It ii very noticeable on the 15" tee we are told. our fiduciary responsibility requires that we address the need for a full Stvironmcintal Impact Report for several seasons. first is to eliminate the impact of the odor that would come with the ex=sion. If this impact is not eliminated. the duality of,golf will diminish by smelling the offensive oder from this'-plant. Secondly,;a need to determine what t az=ut snarediems if any are in the air which they brcatbc. If they can smell :the air being emitted from the sewer, it is obvious they are breathing the airborne substance being emitted from the sewer treatment process. again, it is our fiduciary tesponsibilicy to be prudent and determine what harmful chemical substances, if any, are being emitted'frorn this plant. We trust you concur with determining if in fact there are any harmful substances present for our members to breathc. It is our position that thmse environmental issues do impact our community and need to be tnitigatet*: Thank you for considering our request for a full E2. Very tnily yours, D.B.P.O.A. lack Albrecht Secretary JAJvl TOTAL P.02 kECEIVEO SY DELTA MA]lC:..... MAY 6 May 51 1998 4 SAt�1TAtt3i DISC t' '< County Board of Supervisors C/o Delta Diablo Sanitation District 2500 Pittsburg - Antioch Hwy. Antioch, CA 94509 Expansion RE. proposed Discovery Bay Treatment Plant Dear County Supervisors. nt P ro o5ed You of my strong opposition to the Cant. This is to inform Discovery Bay wastewater treatme expansion of I have personally As a seven year resident of Discovery Bay, As past president and 1 witnessed the Severe increase in noxious odors from the existing plant- - club Residential existing water treatment P Country Taints boardmember of the Discovery Bay ation, i also received numerous resident comp Associ serious pr regarding this very y that the County u r Board has alw� a It within The H�� w" . , ;wastewater treatmer L would a:.lOW Populated res 7 a few hundred feet of aareaw lling to consider a 5'0% eXP neighborhood, Now Y location, will due to its inappropriate of a ; a.cility that, who in health threat to our children and ioper, w oven s To assist a pose a realAnd _for what. ��,-�•: _ Bay residents , the past has shown little regard for making a prof it, to build anotinter st30 homes. you that Discovery Bay, already faces a number roblems that neither you nor . The lack Need � remind Y to resolve. of serious community P inadequacy of developer have been ableof°waternwellsland the inaadequacy of a sufficient number traffic are just t wo Highway 4 to handle existing „ars of service, overnment senior manager with 27 Ye issues As a retired g you must first resolve existiThat ng yet I strongly believe that Y rowth. before you allow furtherofficials,expansion or need to ensure that As our electedas strong to be done' our constituents is equally your representation of Y developers. as your support of wealthy aohn H. Low 2771 Cherry Hills Dr. Discovery Bay, CR 94514 ay- 11-98 02 :23P Gary ,]. Haas NICs-� 3�t3�i3U r+.ua Hess Letter 1 Response to Expanding of the Discovery Bay Sewer Plant ;Nark De Maio, Delta Diablo Sanitation District,2500 Pittsburg- Antioch Highway, Antioch, Ca. 94509 These are issues l addressed,were addressed and will be addressed to the 'Discovery' Bay MAC on May 6 and 26, 1998. First Issue. in your"Notice of Public Review and Intent to Adopt a Proposed Mitigated i Negative Declaration", why did you omit the presentation to the MAC on May 6, and the First Public Hearing at the Board of Supervisors meeting on May'19, 1998 ? ' In the "Expanded Initial Study"for the Discovery Bay Treatment Plant an page 5 paragraph C. "Plant Load", the current biochemical oxygen demand (BOD) and Total 1 suspended solids (TSS)concentrations are rated as"medium strength'"" 'What are the minimum BOD and TSS levels that are considered "strong',? At the Peak Factor of 3.0 or the cumulative Peak Flow of 6.49, would the mating change to"Strong„'The BPA has this plant listed as"major” Page 5 Paragraph D. How can the plant process the peak flow that is projected to be(3) 111 three times the plants daily processing capability? 2.43 (rngd) to 6.09 (mgd) Page 6a Previous BIRs. Please explain haw"the Discovery Bay West ECR analyzed the IV policy and jurisdictional aspects of providing wastewater service to the Discovery Bay West Planning Area, but at that time the engineering details of the collection and treatment system were not known. Page I I Layout No. 1. How close does the Northeast Cerner of the oxidation ditch come V to the fence and road? This seriously impacts the homes that are 42 feet from the Fence/Wall. Page l 1 Layout No. 1, How dose will the sludge lagoon N4. 1 came to the current A maintenance facilities/budding. Will the capacity of the sludge lagoon double" Where is this impact addressed in the report? doubling the sludge and during peak periods tripling the sludge will have a serious odor impact on those houses nearest the lagoon` Vii P e 12 Sewer Conveyance Mastter Plan. This plan was presented by Carollo Engineers ern April 1998, but to wham? What public entities received this report's ,.. Page 12 Paragraph 2. " A large pump station; would convey sewage to DB West and Viii It surrounding developments to the WWTP through Discovery Bay sewer system". a. To what ether developments does this statement refer? b. How many additional Dwelling Units(DU) will these developments entail? _ _..... ..-_..... ......... __. _..... ...._.._. _ _.. ......... ....._... ......... ......... ..........__._.. ...................... ._......... ...... ........ .......... _ _ _ .. ...... - lI -98 02: 23P Gary J. Hess 15 .0-51;a--U48U !X c Could the developers of DBWest charge these developers for "sewer hook-up" and thereby recover some of their costs? Page 18 #7 Permits X In what stage of applying for a new NPDES permit to RWQCB is Delta Diablo SD?' Page 18 Has DDSD obtained the authorization to begin construction of the plant expansion?. If not, when will they apply and obtain this permit ? Page 28 #2, How does the 60% increase of the plant capacity correlate with Table I on X! page 5, where Peak Factors are 3.0 and cumulative Peak Flow is 6.09? How can you mitigate the ambient air quality that is 2 to 6 times greater than the current levels?? Page 28 #2 How can you mitigate the"substantial air emissions and deterioration of X!! a'mb'ient air quality„ when you do not report the number of local complaints?? The report alludes to "undoubtedly other occasions"'that affected the local residents. The number of local complaints were 125 in 1993, 180 in 1994, 106 in 1995, 109 through October of 1996. Please explain why researchers were biased in their research and did not deal with local complaints regarding the "ambient air quality"!r t Page 28 42 Air Now can you mitigate the "substantial air emissions" when no comprehensive test has ever X!!i been administer to determine the airborne pathogens, biological emissions or toxic emissions from the oxidation ditch, clarifiers and sludge lagoon? Page 29 "Odors.." "Expansion of the treatment plant on the existing WWTP site will result in an increase in odors". "Expansion -- has potential to cause more frequent and more intense odor Xjy problems and to expand the number of tots that are impacted by odors." Sludge lagoons and oxidation ditches" are not generally covered (enclosed with a roof, walisetc.)due to the high cost and scrubbing air from such large areas:" a. Why is special breathing apparatus and protective gear needed when treating the enclosed facilities?' b. If the emissions from the sludge lagoon and oxidation ditch are"not harmful" to the XV health of humans, why the special near? c. Why have no comprehensive air quality tests been performed to determine the airborne pathogens, chemical emissions, biological emissions and toxic emissions that may come from the sludge lagoon and/or oxidation ditch? Page 31 Mitigation: "The expansion should be accomplished in a manner that will not increase odor problems X Y! to nearby residential properties. This objection cannot be accomoplished by Layout # 1 which places all of the new facilities on the existing WWTP. How can Management of Delta Diablo Sanatation District support a plan that cannot and will not mitigate an .. .................................................................................................................................................................................................................................... ... . ......... .......... ......_... ........._... ........ ....... ......... ......... ......... .........._................ ........... :may- 11 -98 02 : 24P Gary J. Hess 1510_513-0480 P.03 - increase of odor problems '?? Three of the four plans say they will not increase odor to X V 11 local residents. Why not select one of those three?? Page 52, item 17 , Human Health a. could the proposal result in creation of any health hazard or potential health hazard? Your response--"During the last 30 years there is no evidence that it(the plant) has been reponsible for health-related problems. b. Exposure or people to potential health hazards? Your response -- "no changes in the existing D'DSD opertion are proposed that would create health hazards" Who have you checked with to determine that in over 30 years there has been no evidence of health related problems? Hospitals,Local Doctors, local residents?? X V 1'l t Are you aware there are at least'7 children who have been diagnosed as autistic who were born in DB but who's elder siblings are not autistic,who were born outside of DB??The national ratio is 2 austic child to I5,0t7t3. Why is DB's ration 7 to 2000 children. That includes birth throught high school. What the community has in common is water and the air we breath. Prove by testing the air coming from the plant that there are no harmful emissons that cause neurological damage and we will steep better at night.This is your fiduciary responsibility to act in a reasonable and prudent manner to protect our children. CC. Supervisor Joe Canciamilla Lynne C, Leach Richard K. Rainey Ellen 0. Tauscher ..........................................................................................................................................................................................I............ May-19-98 03: 20P Gary 0. Hass 1510-5I3-0460 P.02 Mr. Joe Candarnilla Hess Letter #2 Super%lsor 5th District 315 East Leland Rd. Suite 100 Pittsburg, Ca. 94565 Fax 925-427-8142 I read with great interest the comments of your colleague, Mark DeSauWar, in the Contra Costa Times this morning. He said, "I think it is in the county's best interest that right now we call time-out on development and, with the input of developers, take a good, hard, serious look at what is left of Contra Costa County and what realistically our citizens would like to see here.". I totally agree. Time out is needed.'Where is the appropriate and necessary regional planning for wastewater services in the Far East Contra Costa County7 Why is there no long range planning for sewage disposal for the unincorporated area of the fix eastern portion of Contra Costa County?What waste water treatment plant is going to serve Cowell Ranch Development? What about the growth near Bron Airport and other future dzvelopment. Where is the regional planning that involves Brentwood which is the fastest growing community in the state of California? A"Phase 11 East County Water Supply Management Study"was completed in Sept 1996, You were a Governing Board Representative, It was a good study as far as it went. Why wasn't a study authorized to deal with the sewer treatment part of "water management'' for Eastern Conlra Costa County including Discovery Bay and surrounding areas? How can you and DDSD Staff approve expanding the sewer plant in Discovery Bay without regional planning? Short sighted, quick fixes will not satisfy the residents of Discovery Bay and the surrounding areas. Complete the regional planning, share the results with the local residents, then choose your solution. CC: Gayle B. Ulikema Mark De Saulnier Jim Rogers Donna Gerber ........... .................. ...... .. .... ......... . ............ Mr.Joe Canclamilla Hess Letter #3 Snpenisor 5th District 315 Bast Leland Rd. Suite 100 Pittsburg, Ca. 94565 Pax 925-427-8142 The Initial Study to expand the sewer plant in Discovery Bay claims"Ifiere is no evidence that it(sewer plant)has been responsible for health-related problems Why didn't they ash;the local residents for their input? Why are there''7 children,born in the Country Club area, between the ages of 2 l/2 and 7 yearsof age who have been professionally diagnosed as"Autistic"?None of their older siblings, who were<born outside of Discovery Bay, are autistic. The national averages for Autism is i to 7500 children, why does Discovery Bay have 7`children in a population of 700 to 900 children between the ages of 2.7 who have been professionally diagnosed as"'Autistie'? The residents of Discovery Bey are entitled to a"focused"Environmental Impact Report. The current odor and"substantial air emissions'from the sewer plant is acknowledged'in the Initial Study. What is not addressed is the need''for a comprehensive test of the airborne pathogens,bacterial emissions or toxic emissions from the oxidation ditch, clarifiers and sludge lagoon.Who is afraid of what the tests may find?They studied for 7 days the environment of the"Fathead Minnows". Are they more important than our children? Test the air Aith a"Focused EIR"and eliminate the doubt that currently exists. Better yet, move the entire plant across highway 94 and remove the problem.' CC: Gavle B. U ikerna Mark Dc Saulnier Jinn Rogers Donna Gerber +'�, •r .-.+t•r r. _ ^n/+ nr+r r nn . nrn�y r.tt!T 09/AT./4'O Mr. Joe Canclaniilla Supervisor Sth District 315 East Leland Rd. Suite 100 Pittsburg,Ca. 94565 Hess Letter 4 Fax 925-427-6142 The Initial Study for the expansion of the sewer plant in Discovery Bay acknowledges that'"The expansion should be accomplished in a manner that will not increase odor problems to nearby residential properties. This objection cannot be accomplished by Layout 91 which places all of the new facilities on the existing Waste Water Treatment Plant". The author of the Initial Study(Darwin Myers)rejects this plan as a solution because the"ambient air quality"will be jeopardize. Why has management staff of Delta Diablo Sanitation District, which is paid by the resident's of Discovery Bay, chosen this layout No.I as the"preferred project"solution?This solution would cost each Discovery Bay West dwelling unit$1,296.00 compared to $3,096,00, which is the cost to hook-up to Delta Diablo Sanitation District.What developer or supervisor is putting pressure on DDSD to select the least expensive solution at the expense of increasing the odor for local residents?This position by DDSD is not defendable from the position of cost at the expense of the"ambient air quality '. How can DDSD select a.plan that does not mitigate the increased odors to local resident?Layout#4, which moves the entire plant across highway#4, is the beat solution at only a cost of 53,600 per dwelling unit. CC: Gavle B. I:likema Mark De Saulnier Jim Rogers Donna Gerber ego fn 9STL 9OL OTSQ 9£:9T 96/6T/90 __ ............................................................................................................................................. May-22-98 13: 39 520 634-2089 P.01 RECLAMATION DISTRICT NO. 800 P.O. Sox 262•Discoveiy Bay, California 9A514 PHONE FAX (510)634-2351 (514)63#-20 ii May 22. 1998 Mark De Main Delta Diablo Sanitation District 2500 Pittsburg-Antioch Highway Antioch,CA 94509 Re: Expanded Initial Study Discovery Bay Treatment plant Expansion and Seger Conveyance Master Plan Dear Mr.De Maio, The construction of the proposed wastewater treatment plant will occur within the boundaries of Reclamation District No 900 Byron Tract(Reclamation District). In fact,the majority of the lands encompassed by Sanitation District No. 19(DSDD)are within the Reclamation District. Therefore,we feel it is important that we clarify certain fttndamentat fame that should be incorporated into the subject document. Initially,it trust be understood that there is no ofliciai agreement amongst the pasties,the Reclamation District and DDSD,for the current practice of discharging the treatment plant's effluent into the District's main drainage canal. Secondly,there is no executed agreement amongst the patties to accept waters from outside the Reclamation District for purposes of pumping them into Old River once discharged into the District's drainage canal. Finally,it must be noted that the existing plant,along with the proposed expansion,are all located within "Zone B"as set forth by the federal Emergency Management agency(FEMA)on the Federal Insurance Rate Maps(i IRWS). The wastewater treatment plant improvements are constructed below sea level and therefore they are protected against flooding by the District's levees. The Base Flood elevation set forth on the FIRM's for this area is+8.0'(U5GS Datum). We anticipate the above information will be incorporated into the subject document and addressed accordingly. If you have any questions,please contact the undersigned or the District's Engineer Christopher H. Neudeck at (209)946-0268 Kjeldsen,Sinnock and Neudeck,Inc. Sincerely,f Jeffrey D. District Manager 1tiC/Pecat m"U w cower cxpmsioa CC: Trustee John Stovall,ESQ. Christopher H. Neudeck,Engineer. .:;;::::::: ::::::::::::::::::::::::::::::;;:::;;;:;;;;;;;;;;:.;:.;;:.;:.;:.;:.;:.;:.;:.;:.;:.;:.;::::.;.:.;;.::.........ii:::::::::.;.;.;::.;.;::.;.:::::::::::::..............................:::::::................. ... :..:.:.. .. :::.;....:::.. .._: :..:: .......I... 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''....,.......................",""..,..,.......,..,.....I.......I.. . .. - ..:O... ,.." - .. .. .. .....:... ::, -, . . --v - .....— ... 11...........—.........I......—........... ..: .:.-,-:�.4 .. : : ....:..,.....,.": ;...... - ,.,."" - I- .-. .. .. :: ::::::....: : :.. .. j. .. ::; .....: . ... . ..: ... . . .. . .:. . .::: . . . . . ...... ....:: .. ;::; . : :.:... . ..:.. ... CORRESPONDENCE ON EXPANDED INITIAL STUDY DISCOVERY BAY TREATMENT PLANT EXPANSION MAY 1998 AND SEWER CONVEYANCE MASTER PLAN DISCOVERY BAY MAC MEETINGS On May 6th and 26th the Discovery Bay MAC held public meetings in the Discovery Bay community. These meetings provided the Delta Diablo Sanitation District(DDSD)the opportunity to provide background information on the need for expansion of the wastewater treatment plant, review the various layouts analyzed by the District,and discuss environmental review of the project. It also allowed the District to explain the public hearing process and to answer questions posed by interested residents of Discovery Bay. The speakers were requested to submit their comment in writing. Nevertheless,DDSD staff took notes, and the following is a capsule summary of public comments. May 6th Meeting I. procedural Issues Some speakers questioned the CEQA process and expressed a desire to have the project review and approval process delayed until the Community Services District (CSD) is established. The appropriateness of a Mitigated Negative Declaration was questioned, and one resident asked what measures are being implemented to reduce the impacts to a less-than-significant level. R& ponse. The questions on the review and approval process is a policy and jurisdictional issue. Action on the expansion could be delayed until the CSD is established, but delay would put pressure on a newly established District to act on a major project. Annexation of Discovery Bay West occurred while County Sanitation District No. 19 was the District that had responsibility for policy and operational issues. For these reasons, it could be considered logical for the Directors of Sanitation District No. 19 to act on the pending project because it represents the conclusion of a planning process than commenced in the mid 1990's with the approval of the Discovery Bay West project. The mitigation measure identified to reduce impacts to a less-than-significant level are presented in both the Expanded Initial Study and the Mitigation Monitoring Plan. 2. Qene1al Some speakers supported a regional approach to wastewater treatment in the East County Response. See response to Gary J. Hess(Letter#2). 3. Odors and Contaminant Ex op sure Many speakers commented that the potential for airborne volatile compounds and pathogens are potentially significant impacts. The speakers viewed an EIR as an appropriate vehicle for analysis DISCOVERY BAY TREATMENT PLANT EXPANSION CORRESPONDENCE ON EXPANDED INITIAL STUDY AND SEWER CONVEYANCE MASTER PLAN MAY 1998 and evaluation of this effect. They also stated that existing odor controls are inadequate, and reported that there is a record of more than 100 complaints/year. Rgsl2onse. See response to letters received from the Discovery Bay Property Owners Association, Inc.,John H. Low and Gary J.Hess(especially Hess Letters#I and#3). 4. Facility Siting/Process Sizing Considerations Several speakers questioned whether an adequate number of alternatives were evaluated, including locations other than those evaluated,and unit processes other than those proposed. The thrust of the comment was that there is a need to look at the ultimate buildout of East county and selecting a treatment process and plant site(s)to efficiently serve that urban area. Reponse. The Delta Diablo Sanitation District analyzed the expansion of the wastewater treatment plant to accommodate flows generated by approved(but not yet built)projects that are within the District. The comments of the speakers appear to suggest analyzing the development potential of lands outside the Sanitation District No. 19 boundary. Currently, lands west of Sanitation District No. 19 are designated"Agricultural Core"by the County General Plan;lands to the south,east,north and west of the District's boundary are outside the urban limit line.The type of long range land use planning called for by the speakers is normally not the function of a sanitation district. 5. Sneaker Cards Speaker cards were submitted by three persons. Those cards are presented on the following page. May 26th Meeting A spirited meeting was held by the Discovery Bay MAC on the Expanded Initial Study and Expansion of the WWTP. Many of the issues raised mirrored comments received at the May 6th meeting.Briefly summarized,the views of these persons attending the meeting are as follows: a)the existing plant was considered a nuisance (and potential health hazard); b) delay in the approval process so that the CSD would have authority over the expansion;c)the audience generally opposes expansion of the plant on the existing wastewater treatment plant facility site; and d)they believe preparation of an EIR is essential for the project. Response: No new CEQA issues were raised at the Discovery Bay MAC meeting. The issues raised pertain chiefly to odors and air quality. The responses to the written comments address these issues. ............................................................................................................................................................................................................................................................................................................................ daoit/9E 12.12 '�';'d Y0 rtle rias DbBb-ACNlit166aih1} phot 1111;w 4114 sem, w P.a/3 osv,,i,,Q, } MFN"tFORM TO 73 iris'NG DATE !6 •,[. r,l��. top IC covpAso: mac"gk &c j2,.g ge-,,JV, C�Auz-`" Vn O-maf,rW.rRFfY �'rrg o R 19,44 rl rte c> rw,n&aA z F_Js`4&=hh, Am thole MY what aoeaa of ift0rat Yon wrooki liko to ow by"D.$M A C-in do fikwo? Do you haw saw fat impmvon t of D.B.M.A.C.awarmas? 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Dbao"tj B"MWuic*W Adsift"CwA"di*P.O.am m•ateo-y ear;CASM14•cstO 6344132 ................................. ............I............... DISCOVERY BAY TREATMENT PLANT EXPANSION MAY 1998 AND SEWER CONVEYANCE MASTER PLAN Speaker List for the 26 May "Town Hall Meeting" held by the DISCOVERY' BAY' MAC • A� vlc rQ a.2 L. �7 6' 7,7 517-rF)?F/St( f2, 1-3- Cr/, r . 4,4 � 14 Ll 7� ......... .......... ......... ........ ..........