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Home My WebLink AboutMINUTES - 10172000 - C4-C8 �i TO: BOARD OF SUPERVISORS, AS THE GOVERNING BODY OF THE CONTRA COSTA COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT FROM: MAURICE M. SHIU, CHIEF ENGINEER DATE: OCTOBER 17, 2000 SUBJECT: APPROVE AMENDMENT NUMBER 1 TO THE CONSULTING SERVICES AGREEMENT WITH VALI COOPER AND ASSOCIATES, INC. FOR THE SAN RAMON CREED — DROP STRUCTURE 3A PROJECT, ALAMO AREA. PROJECT NO. 7520-6691_59-00 pest tc eques s or Recommenaafionffl&Backgroundus t ica ton I. Recommended Action: APPROVE and AUTHORIZE the Chief Engineer to execute Amendment Number 1 to the Consulting Services Agreement with Vali Cooper and Associates, Inc. for the San Ramon Creek — Drop Structure 3A Project. II. Financial Impact: There will be no impact on the County General Fund. The $17,500.00 increase for this contract amendment shall be paid for by Federal Emergency Management Agency Funds (77%), State of California Funds(20%), and Flood Control Zone 36 Funds(5%). Continued on attachment: X yes SIGNATURE: RECOMMENDATION OF COUNTY ADMINISTRATOR RECOMMENDATION OF BOARD COMMITTEE APPROVE OTHER SIGNATURE (S): ACTION OF BOARD ON: _B , 2000 APPROVED AS RECOMMENDED OTHER VOTE OF SUPERVISORS NONE X UNANIMOUS (ABSENT } AYES: NOES: I hereby certify that this is a true and correct copy of an ABSENT: ABSTAIN: action taken and entered on the minutes of the Board of Supervisors on the date shown. Contact: Mike Carlson, (925)313-2321 Orig. Div.: PW(Constr) ATTESTED: OCTOBER 174- 2000 cc: County Administrator PHIL BATCHELOR, Clerk of the Board of Supervisors and Auditor-Controller County Administrator Public Works - Accounting, R. Gilchrist By Deputy - Construction, R. Bruno - Design Contractor KJ:kj g:\grpdata\const%bo\2©00\09-septemberk26-moor-csa-hUamend i.doc Board Date: October 17, 2000 Subject: APPROVE Amendment No. 1 to the Consulting Services Agreement with Vali Cooper and Associates, Inc. for the San Ramon Creek Drop Structure 3A Project, Project No. 7520-61391-59-00 Page: 2 of 2 III. Reasons for Recommendations and Background: On June 15, 2000 the Chief Engineer executed a Consulting Services Agreement in the amount of$15,000.00 with Vali Cooper and Associates, Inc. to provide construction engineering support for the San Ramon Creek r.. Drop Structure 3A Project. It has been mutually determined that additional support in the estimated amount of $17,500.00 is required in order to complete the project. This amendment to the original Agreement brings the contract total to $32,500.00. This amendment to the original Agreement brings the total value of the contract over the $25,000.00 limit for Consulting Services Agreements and thus calls for Board approval before the Chief Engineer may execute the contract. IV. Consequences of Negative Action: If this Amendment is not approved, another means of completing the construction engineering activities would need to be identified. e' X7TO: BOARD OF SUPERVISORS, AS GOVERNING BOARD OF CONTRA COSTA COUNTY AND CONTRA COSTA COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT FROM: MAURICE M. SHIU, CHIEF ENGINEER DATE: OCTOBER 17, 2000 SUBJECT: APPROVE the Drainage Area 52C Drainage Area Plan and Drainage Fee Amendment and DETERMINE the activity is exempt from the California Environmental Quality Act (CEQA), Brentwood area. Project No. 7571-6D8417 CDD-CP# 00-19. Specific Request(s) or Recommendation(s) & Bac groun ustl kation 1. RECOMMENDED ACTION: APPROVE the Project, and DETERMINE that the activity is not subject to the California Environmental Quality Act (CEQA) per General Rule of Applicability (Section 15061(b)(3). DIRECT the Director of Community Development to file a Notice of Exemption with the County Clerk. AUTHORIZE the Chief Engineer to arrange for payment of a $25 fee to Community Development for processing, and a $25 fee to the County Clerk for filing the Notice of Exemption. Continued on Attachment: X SIGNATUR—RECOMMENDATION OF COUNTY ADMINISTRA OR . _RECOMMENDATION OF BOARD COMMITTEE —APPROVE OTHER SIGNATURE(S): ACTION OF BOARD ON OCTOBER 17, 2000 APPROVED AS RECOMMENDED 15TREFZ VOTE OF SUPERVISORS UNANIMOUS (ABSENT NONE ) AYES: NOES: ABSENT: ABSTAIN: EC: G:\GrpData1EngSvc1ENVIRo\2000 projects\DA52C\DA 52C BO.doc I hereby cern that this is a true and Correct Co Or G:\GrpDatgpDist\Board Orders\2000\10 October\enviro 10-17- Y fY copy Of an 00b.doc action taken and entered on the minutes of the Board of Orig.Div: Public Works(Engineering Services Division) Supervisors on the date shown. Contact:Cece Sellgren phone: 31 3-2296 cc: Administrator-E.Kuevor OCTOBER 17 2000 Auditor-Controller ATTESTED: s Community Development--0.Foley PHIL BATCHELOR, Clerk of the Board of Supervisors and Public Works: Accounting County Administrator Flood Control,P.Detjens BY Deputy SUBJECT: APPROVE the Drainage Area 52C Drainage Area Plan and Drainage Fee Amendment and DETERMINE the activity is exempt from the California Environmental Quality Act (CEQA), Brentwood area. Project No. 7571-6138417 CDD-CP# 00-19. DATE: OCTOBER 17, 2000 PANE: 2 11. FINANCIAL IMPACT: The activity is funded by Drainage Area 52C Fees (100%). III. REASONS FOR RE OMMENDATIONIBACKGROUND: The purpose of the activity is to amend the drainage area plan to reflect recent changes in land use planning by the County and the City of Brentwood. The Contra Costa County Flood Control and Water Conservation District has been coordinating with the City of Brentwood to amend the current drainage plan boundary and fees for Drainage Area 52C that was adopted in 1982. The proposed amendment expands the boundary of the southeast portion of the current zone plan to incorporate the Garin Ranch project. The fee adjustment will reflect the area of impervious surface created by new development projects. Also added are approximately 80 acres south of Balfour Road, and approximately 80 acres at the northeast corner of the zone to incorporate the balance of the City's park and sewage treatment facility. The total area to be added to the drainage area is less than 300 acres. None of the Drainage Area lies within Agricultural Core Areas. Both the current plan and proposed amendment call for the drainage system to be primarily an underground storm drain network with four, distinct detention basins to meter the outflow of runoff into Marsh Creek. The proposed amendment will realign and relocate facilities to accommodate the runoff and proposed street network anticipated due to the Brentwood General Plan 1993-2010. Developers as a condition of approval for their projects have installed most of the facilities south of Chestnut Street. Other facilities will be installed as development and need arises. The City will address physical impacts of these facilities in their public review process. Upon completion of the proposed facilities, storm-water runoff will be impounded within the basins, and will flow into Marsh Creek during non-peak flow periods. It can be seen with certainty that there is no possibility that the activity may have a significant adverse effect on the environment. The activity has been determined to be in compliance with the General Plan of the City of Brentwood. IV. CONSEQUENCES OF NEGATIVE ACTION: Delay in approving the project will result in retention of present drainage area boundary, hindering of drainage area plan and loss of revenue from drainage area fees. Community Contra Dennis M.Barry,AICP Community Development Director Development Costa Department County County Administration Building 651 Pine Street 4th Floor,North Wing Martinez,California 94553-0095 (925)335-1215 April 28,2000 Phone: County File#CP 00-19 Attention:Earl Crosby —Engineering Services Dear Applicant: The Contra Costa County Community Development Department has completed an initial study of the environmental significance of the project represented by your pending application bearing County File Number P# 00-19. In conformance with Contra Costa County Guidelines for implementing the California Environmental Quality Act of 1970(CEQA),it has been detmiined that your project will not have a significant effect on the environment, Your project falls within the following category: (t✓) AN ENVIRONMENTAL IMPACT REPORT(EIR) IS NOT REQUIRED. (V) The project is categorically exempt(Class). { ) The CEQA requirements are accommodated by the EIR previously prepared for ( ) A statement that an EIR is not required(Negative Declaration of Environmental Significance has been filed by the Community Development Department(unless appealed). { ) Other:General Rule of Applicability(Section 15061(bX3). ( ) AN ENVIRONMENTAL IMPACT REPORT (EIR) IS REQUIRED. { ) The complexity of your project requires your submission of additional special reports or information(as outlined on the attached street)(whish will be outlined in a forthcoming letter). { ) A consultant will be hired to prepare the environmental impact report. This procedure is explained on the attached sheet. Preparation of the EIR cannot be started until the fee and additional information requested is received by the Community Development Department. If you have questions concerning this determination or desire additional information relative to environmental impact report regulations,please call(925)335-1213 and ask for Debbie Chamberlain. Sincerely yours Dennis M. Barry,AICP Community Development Director By: e Office Hours Monday-Frday:8:00 a.m.-5:00 p.m. Office is closed the 1 st, 3rd&5th Fridays of each month CONTRA COSTA COUNTY COMMUNITY DEVELOPMENT DEPARTMENT ESI Pine Street, N. Wing - 4th Floor Martinez, CA 94SS3 Telephone: 33S-1210 Fax: 335-1222 TO: Development Engineer/Architect DATE: FROM: Patrick Roche, Advance Planning SUBJECT: MANDATORY REFERRAL FOR GENERAL PLAN CONFORMANCE Community Development staff has reviewed the attached project, CP ata- to determine if mandatory referral for General Plan Conformance, as required by Section 65402 of the Government Code, is necessary. The project needs no further mandatory referral clearance from County staff subject to the following actions: ( } This project has been determined to be exempt from 65402 review. ( } This project has been determined to be exempt from 65402 review in accordance with the Board of Supervisors Resolution 81/522 because the project involves a road alignment project of a minor nature.. {�3 The project site is located within the City ofand should be referred to the City for 65402 review. ( ) The project site is located within the City of Our Department does not review projects for General Plan.Conformance (refer to Government Code Section 65402) that are located within a City. t } Community Development staff makes the following attached recommendation which should be incorporated into the staff report on this matter. The project needs mandatory referral and County staff will process this project in the following manner: ( } 65402 review is required. Community Development staff will carry this matter before the appropriate Planning Commission. { } 65402 review must be withheld until completion of an Environmental Impact Report on this project. ( } Other procedures. CWP.mr4gpo.99 1-61. Recaweo -- - -`1N ---- SEP 2 7 ENVIRO T� OMENTA September 25, 2030)0) Ms. Cece Sellgren Contra Costa County Flood Control & Water Conservation District 255 Glacier Drive Martinez, CA 94553-4597 Via FAX: (925)313-2333 Subject: #CP (303-19 -- Drainage Area 52C-Amend Drainage Area Plan Dear Ms. Sellgren: The City has reviewed the proposed amendment to the Drainage Area Plan to expand the boundary of Drainage Area 52C. We have determined that this activity will help improve Brentwood storm drainage facilities and will facilitate infrastructure improvements needed to protect the health and safety within Brentwood. Consequently this activity is consistent with the City's General Plan. If you have any questions about this letter or require additional information, please contact me at (925) 516-5150. Sincerely, —~ Winston Rhodes, AICP Senior Planner cc: Chron File Mike Leana, Chief of Planning Teresa Wooten, Senior Engineer wr:1i ettere\oountytCCCO FCDA62CLTR City bait-708 Third Street, Brentwood,California 94513-1396 Phone:(925)516-5400 Fax:(925)515-5401 Public Works-151 Sycamore Avenue,Brentwood,California 94513-1396 Phone:(925)516-5498 Fax:(925)515-5497 Community Development- 104 Oak Street,Brentwood,California 94513-1396 Phone:(925)515-5405 Fax:(925)516-5407 DETERMINATION THAT AN ACTIVITY IS EXEMPT FROM THE CALIFORNIA ENVIRONMENTAL QUALITY ACT (CEQA) FILE NO.:7571-6D8417 CP NO.: 00-19 ACTIVITY NAME: Drainage Area 52C-Amend Drainage Area Plan DATE: Monday, April 17, 2000 PREPARED BY: Earl Crosby This activity is not subject to the California Environmental Quality Act(CEQA) pursuant to Article 5, Section 15061 (b) (3) of the CEQA Guidelines. It can be seen with certainty that there is no possibility that the activity may have a significant adverse effect on the environment. DESCRIPTION OF THE ACTIVITY: To provide basic drainage infrastructure for the eastern portion of Brentwood, the Contra Costa County Flood Control and Water Conservation District has been coordinating efforts with the City of Brentwood to amend the current drainage plan boundary and fees for Drainage Area 52C that was adopted in 1982 (Figure 1,2). The proposed amendment expands the boundary of the southeast portion of the current zone plan to incorporate the Garin Ranch project(Figure 2). The fee adjustment will reflect the area of impervious surface created by new development projects. Also added are approximately 80 acres south of Balfour Road, and approximately 80 acres at the northeast comer of the zone to incorporate the balance of the City's park and sewage treatment facility. The total area to be added to the drainage area is less than 300 acres. None of the Drainage Area lies within Agricultural Core Areas (Figure 2). Both the current plan and proposed amendment call for the drainage system to be primarily an underground storm drain network with four, distinct detention basins to meter the outflow of runoff into Marsh Creek channel. The proposed amendment will realign, relocate facilities to accommodate the runoff and proposed street network anticipated due to the Brentwood General Plan 1993-2010. Developers as a condition of approval for their projects have installed most of the facilities south of Chestnut Street. Other facilities will be installed as development and need arises. The developers will address physical impacts of these facilities. Upon completion of the proposed facilities, storm-water runoff will be impounded within the basins, and will flow into Marsh Creek during non-peak flow periods. LOCATION: Drainage Area 52CjIp located in the east county area of Brentwood (Figure 1,2) REVIEWED BY: DATE: Cece Sellgren Environmental Planner APPROVED Y: DATE: fttM6uivelopment Department G:\GrpData\EngSvc\ENVIRO\2000projects\CEQAonlylDeterm. Exempt\CEQA Determin. DA52C.doc (Form Revised 2/97) 5 C> � ` C t ° to lot r� �.ftm■144,+/,4,t W[i11,,,,,.. � l • � ��M� 44/iHi - -• „ 7{t�+tlatti"� • S { r 2KlN�ir{A{tilj�!>j4 � - ;roma 1 � •� 1 t 4444}144.4y ''t i,Y4iif14itY4r44tti ..� Nt{N144ttta ��rri � 4; ipigusit as �1ti�.� w S4p1fiNRt4- 1r' f r1��9�►".� y�I\a"4rrt /f!f •*.�E`4 f�r*r err ,.r44{44 fo ,'; +.. `� „ ,rea ..+n4� l4irfr►'i �M..� f�/6 ♦%f1kj��i/.�r"�t�i ^' i it:l; �.:'..i...:-,...- #':' " af% - �" + �M4�i�^"i�i+ty� �� ♦fs,,� %",�'�sf.f�i,:'e f''`�41il�4'.■r � ;,4anti44r►, t #1 i s • .f +tt 444 '' 44441 �� »itt(t� ��, *. j / �✓ I!F t444/ :IN! 4alK.. t4 r",`t�•�I':1kl ♦� //'r�* /f/�i ..+ +r«.. 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SHIU, PUBLIC WORKS DIRECTOR DATE: OCTOBER 17, 2000 SUBJECT: ACCEPT THE PETITION AND ADOPT THE RESOLUTION SETTING THE HEARING FOR THE FORMATION OF THE WENDT RANCH GEOLOGIC HAZARD ABATEMENT DISTRICT, SUBDIVISION 8002, DANVILLE AREA. (WO 6X5082) SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION I. Recommended Action: 1. ACCEPT the Petition for the formation of the Wendt Ranch Geologic Hazard Abatement District (GHAD), and, 2. ADOPT the Resolution SETTING the hearing date on the proposed formation of the Wendt Ranch GHAD on Tuesday, December 5, 2000 at 9:30 a.m. in Room 107 of the Board of Supervisors' Chambers, 651 Pine Street,Martinez, California, as the time and place for a public hearing to consider oral and written objections or comments concerning the Wendt Ranch GRAD. II. Financial Impact: There will be no impact to the General Fund. All costs will be covered with revenue generated through parcel assessments for the GHAD. Continued on Attachment:X SIGNATURE: Of, 6delof 'J _RECOMMENDATION OF COUNTY ADMINISTRATOR RECOMMENDATION OF BOARD COMMITTEE ®„APPROVE OTHER SIGNATURE(S): ACTION OF BOARD ON APPROVED AS RECOMMENDED OTHER VOTE OF SUPER. ORS UNANIMO ABSENT 1 AYES: NOES: ABSENT: STAIN: SEW G:1GrpD \SpDu"ord Ordw\2000kWcrdt RmKhlF 10-17-oo.doc Or G.-T-VData\SPDist Soad Orders12000110 OctoberiSD 10- .doc Orig.Div. Public Works(Special Districts) Contact: Skip Hpperly(313-2253) cc: Auditor-Controller Corruntnity Deroloprneat County A&ninistrator Cantil Cowl PW Acoo4mdng Duet Curtin,McCutdusi,Doyle,Brawn A Hoarsen 1333 N.California Blvd,WahKd CYsdt,CA 94594 Bill Gray,Gray&Associates,1820 Bonanea Street,W.C.CA 94594 Chris Tfu6bri4P,Shapell htdwrtriao,P.O.Cox 361169,Milpitas.CA 93035 SUBJECT: ACCEPT THE PETITION AND ADOPT THE RESOLUTION SETTING THE HEARING FOR THE FORMATION OF THE WENDT RANCH GEOLOGIC HAZARD ABATEMENT DISTRICT, SUBDIVISION 8002,DANVILLE AREA DATE: OCTOBER 17, 2000 PAGE: -2- 111. Reasons for Recommendation and Back round: The Conditions of Approval for Subdivision 8002 require that a GHAD be formed in order to mitigate the potential for soil movement in this development. The District boundaries and the subdivision boundaries are the same. All of the subdivision parcels are currently owned by one individual,who is petitioning the Board to form the Wendt Ranch GHAD. Wendt Ranch is a 167-acre development comprised of 272 residential units along the south side of Camino Tassajara Road near Blackhawk Drive. The purpose of the GHAD is to mitigate or abate landslide and erosion hazards that could directly affect properties included in the GHAD. The Plan of Control describes the work contemplated for this district, including maintenance,monitoring, and funding. Funding for the GHAD will be based on a parcel assessment from each improved lot in the subdivision. Parcel assessments will be collected annually and used for maintenance.Unexpended funds will augment the reserve for the following year. It is anticipated that the Board of Supervisors will assume the responsibilities as the Board of Directors of the GHAD. IV. Conse ...quences of NegyaAive Action The project will not be able to proceed because no building permits may be issued without a GHAD being formed. PETITION FOR FORMATION OF THE WENDT RANCH GEOLOGIC HAZARD ABATEMENT DISTRICT PURSUANT TO DIVISION 17 (commencing with Section 26500) OF THE PUBLIC RESOURCES CODE OF THE STATE OF CALIFORNIA TO: Clerk of the Board of Supervisors of Contra Costa County: The undersigned owner of land within the boundaries of the district proposed in this petition hereby requests that the Board of Supervisors initiate proceedings to form a Geologic Hazard Abatement District("GHAD")pursuant to the provisions of Division 17 of the Public Resources Code, Sections 26500 et seq. Said owner owns all the land to be included within the GHAD boundaries. (a) This petition is made pursuant to Division 17 of the Public Resources Code with particular reference to Article 3 (commencing with Section 26550) and Article 4 (commencing with Section 26561). (b) Opposite the signature of the petitioner is an indication of the lot, tract and map number or other legal description sufficient to identify the signature of the petitioner as that of the owner of land within the territory to be included within the proposed CHAD. (c) Opposite the signature of the petitioner is an indication of the date on which the petitioner signed this petition. (d) The following documents are attached to this petition and are incorporated herein by reference as if set forth in full in the petition: 1. As Exhibit A, a map of the boundaries of the territory to be included within the proposed GHAD; 2. As Exhibit B, a legal description of the boundaries of the territory to be included within the proposed CHAD; and 3012N33A/72272-00" 1 1-55- 3. 3. As Exhibit C, a Plan of Control prepared by an engineering geologist certified pursuant to Section 7822 of the Business and Professions Code which describes the specific geologic hazards to be addressed by the CHAD and the plan for their prevention, mitigation, abatement and/or control. SIGNATURE ADDRESS DATE Assessor's Parcel No. ej4. 206- 030006 !r¢. hristian Truebridge, Assistant Secretary, Shapell Industries, Inc. 3012W33.1/72272-0044 2 EXHIBIT A r M } �'Nt j S arm; ; e . ■ � � �� ; ■ e ;■■ - - $ - �� ■ * � e � $ � ■ � - • � ■ < � � � � ■ � � e - . � . ■ , \2 - ; . ■ � � e� � e � * . - � ' ■ - � ■ $ � � e � ® ~ � ® � # � . ' � � � � . ■ e � ■ � ; e ; � ■ - � , ■ � . - ■2■ � < e . . e~ $ $ _ , @ . • ■ e . - $ � ;,.■ . . � . ■ � ■ � 2 - e . � . e � � 2 • $ - - e . $ . • � ? e . e � . � - e � < ; ■ ■ : * � ■ ■ ■ . ^ t - � � f - ■ e er . . e • - r , � - � � � ; ■-. . - . �■ � � $ ; < . . . . 2 - - $ 2 • �■ � - ®$ e � ; . � . � - • e ... . . � ��. ... e � � � . ■ � t ■ ■ , -- ■ � . ,. , � $ , . , $, , � § e � � e � ■ � � e � ; ■ � ■ f � ■ � e . � � - � � e - . f . ; . § e « ■ � � � e - ■ e � � '� . � � ■ e �$ ■ - * - � ; $ $ � ° ■ . � § ■ - . ■- � � - � • ' � . • , ■ - ■' � ; . > » � . . . . - � e ? � .e � ■ � \ ; $ � e . � • e ? � � ■ � � � e ° ■ t- � . ■ e - © ■, . � < , � � e � e � e � ■ . � . . / $ » � ■ ? e � � � . e ^ . � < . e ` ? � . t- ' ■ � , , ■ � . � 2 . � � � , . � _ . . ■ . . . . � .e 2 � • ■ . $ . e , . ■ � . � � . • t� :e - ■■' a . t � : � . .; « �' � . � � e � � � � . e < � � ■ ? e . � . e � � � � � e $ . �\ . . � ■ , . � ■ ■ . . � � e , . e . . � . - . a - � < ., � , , . . � . . . . . . - � e � . . l : e - • - ? . . . e e - * - . � . � - � . | | -■ $ � ; � � -:® . ;ee � $ < „ � , , J � . � . \| . . . . ■ . . ■ . . $ : - . - . . < - . ■ °e . � ■ ' ■ � ° � . ■� 2 .- a e � , - , < � ■ $ ® . . : . ; � �. t ■ e � ,- e � - � - � . � ' < . , . $ . • ■ � $ - � e $■'■$ ■- . ■ �� . .- e �� e �� e � e -� � $ � � • ■ « . e � . � . � � ■ . � � � ■ : # . � . e - |'`■ � - ■■ e � - e ■ , � � � � 4. y_ , ..■, ■ ■ �■■� . ■ . . ~ VVV EXHIBIT C PLAN OF CONTROL FOR WENDT RANCH GEOLOGIC HAZARD ABBATEM[ENT DIST UCT (GLAD) SUBMITTED TO SHAPELL INDUSTRIES OF NORTHERN CALIFORNIA PREPARED BY ENGEO INCORPORATED PROJECT NO.4063.5.050.01 JUNE 2612000 COPYRIGHT 0 2000 BY ENGEO INCORPORATED. THIS DOCUMENT MAY NOT BE REPRADT JCED IN WHOLE OR IN PART BY ANY MEANS WHATSOEVER. NOR MAY IT BE QUOTED OR EXCERPTED 'WITHOUT THIS EXPRESS WRITTEN CONSENT OF ENGEO INCORPORATED. ENGEO GEOTECI KICAL AND ENVIRONMENTAL CONSULTANTS I N C O R P 0 R A T E D MATERIALS TESTING Project No. 4063.5.050.01 June 26, 2000 Mr. Chris Truebridge Shapell Industries of Northern California P.O.Box 361169 Milpitas, CA 95035 Subject: Wendt Ranch CHAD Contra Costa County, California PLAN OF CONTROL FOR WENDT RANCH Dear Mr.Truebridge: The Wendt Ranch Plan of Control has been prepared and is being submitted in conjunction with an Engineer's Report and a petition filed by Shapell Industries of Northern California to form the Wendt Ranch Geologic Hazard Abatement District(GHAD). Very truly yours, ENGEO INCORPORATED Prepared by: Reviewed by: Xric H 11 Uri Eliahu <Thf64odoreayham CEG 2063 eh/tpb/jd:poc 2401 Crow Canyon Road •Suite 200•San Ramon,CA 9450-1545• (925)838-1600• Fax(925)838-7425 www.engeo.com • E-mail:engstaff@engeo.com EAGav INCORPORATED TABLE OF CONTENTS Letter of Transmittal Page J. Authority and Scope.......................................................................................................1 PropertyIdentification........................................................................................... 1 H. Background .....................................................................................................................2 III. Site Geology.....................................................................................................................4 GeologicUnits ......................................................................................................4 Landslides.............................................................................................................5 IV. Slope Instability...............................................................................................................6 V. Slope Stability Considerations........................................................................................8 VI. Criteria for GE AU Responsibility...............................................................................11 1. Isolated or Remote Slope Instability..............................................................11 2. Single Property.............................................................................................. 11 3. Geologic Hazards Resulting From Negligence Of Property Owner............... 11 4. Property Not Accepted.................................................................................. 12 VII. Acceptance.....................................................................................................................13 1. Activation of Assessment..............................................................................13 2. Responsibility for GHAD Activities.............................................................. 13 VIII. Fendt Ranch Open Space flan of Control.................................................................14 IIIA. Priority of GIIAAU Expenditures..................................................................................15 Geotechnical Techniques for Mitigation of Landslide and Erosion Hazards.......15 K Biotechnical Recommendations for Prevention and Mitigation of Existing or Potential Erosion Ilazards............................................................................................13 M. Maintenance and Monitoring Schedule.......................................................................18 SELECTED REFERENCES LIST OF FIGURES 4063.5.050.01 June 26, 2000 F. INCORPORATED I. Authority and Scope The Wendt Ranch Geologic Hazard Abatement District ("GHAD" or "District") is proposed to be formed under authority of the California Public Resources Code (Division 17, commencing with Section 26500). Formation of the CHAD is necessary to satisfy Conditions of Approval 18, 26 and 162 of Contra Costa County Board of Supervisors Approval of Subdivision and Final Development Plan SD968002 and DP963004 on December 17, 1996. Development of a Plan of Control prepared by a State Certified Engineering Geologist is a requirement for formation of a GRAB. Pursuant to Section 26509, this Plan of Control was prepared by an engineering geologist certified pursuant to Section 7822 of the Business and Professions Code and describes in detail the geologic hazards,their location,and who is affected by them. It also provides a plan for the prevention, mitigation, abatement, or control thereof. As used in this Plan of Control, and as provided in Section 26507, "geologic hazard" means an actual or threatened landslide, land subsidence, soil erosion, earthquake, fault movement, or any other natural or unnatural movement of land or earth. ErQpprty Identification The proposed GRAD boundary is shown on Figure 1. 4063.5.050.01 June 26, 2000 EAGEO INCORPORATED Background The site is located to the south of Camino Tassajara Road, near Blackhawk Drive in unincorporated Contra Costa County, east of Danville. The irregularly-shaped parcel is about 164.8 acres in area. One branch of the Alamo Creek traverses the site in a northeast to southwest direction, and another borders the western site boundary. The subject site typically consists of a relatively-level area, with minor knolls in the northwest portion of the property and ridges and hillslopes in the southeastern half. Elevations range from a low of about 628 feet above mean sea level (msl) at the southwest comer to a high of about 915 feet above insl at the southern end. Currently, it is anticipated that title for the majority of the open space will pass to the CHAD. Ownership of the detention basin may pass to the Contra Costa County Flood Control and Water Conservation District. As the open space within and immediately adjacent to subdivision tracts is an amenity that benefits all of the property owners within those subdivisions, the funding of the maintenance of the open space should be shared by all current and future property owners within recorded subdivision tracts in the GHAD's boundaries. Oversight of the actual physical maintenance responsibility for parcels of open space will pass to the CHAD. Maintenance shall be consistent with the Governing Documents of the Wendt Ranch Open Space Maintenance Plan. The CHAD will mitigate or abate landslide or erosion hazards that could directly affect improved, developed, and accepted properties (as defined in Section V11) within the Wendt Ranch Site, in accordance with Section V1 The CHAD m assume other peripherally-related open-space responsibilities, such as erosion control, mowing, trail maintenance, and selected other maintenance associated with open space. 4063.5.050.01 June 26, 2000 2 ,r EEO INCORPORATED Maintenance, repair and replacement of creels improvements (including vegetation control and armoring of channels) and desalting of detention basins is the responsibility of the Contra Costa County Flood Control and Water Conservation District. Consistent with the Governing Documents of the Wendt Ranch Open Space Maintenance Plan, the CHAD shall have the right to approve any construction, maintenance or repair in the open space which the CHAD determines has the potential to impact geologic stability. 4063.5.050.01 Jane 26, 2000 3 Emu INCORPORATED M. Site Geology Geologic Units The geologic units mapped on the site include bedrock and surficial deposits consisting of colluvium, alluvium and landslides which are described below. Bedrock at the subject site is mapped by Dibblee (1980) as nonmarine sedimentary rock (Tps). This bedrock is described as consisting of late Miocene to Pliocene age (8.5 to 2.5 million years) claystone, and siltstone interbedded with sandstone, pebble conglomerate, and volcanic tuff (Davenport, 1986). According to studies of these rocks by Issacson (1990), the depositional environment for these sedimentary rocks is believed to have been meandering and braided streams. Bedrock at the site strikes to the west to northwest with dips measured from 70 to 88 degrees to the northeast. One tuffaceous unit was mapped across the north-south trending ridge by Dibblee (1980). Ifighly-sheared and weak bedrock is known to occur in this area. Such conditions may result in a lower than normal stability of slopes. The flat-lying portion of the subject property is underlain by Quaternary age alluvial terrace deposits. These soils consist of unconsolidated gravel, sand, silt and clay. Incised into the terrace deposits are the existing stream channels that contain more recent alluvial deposits, similar to the terrace deposits,but currently subject to reworking by the modern streams. Mantling the bedrock and filling swales are colluvial deposits, which include landslides. These sediments are derived from weathering of the underlying bedrock and consist mostly of clay to silty clay. This material generally is expansive and has low strength. Where colluvium is located 4063.5.050.01 June 26, 2000 4 ENr-u INCORPORATED on sloping ground, it is characteristically unstable. Within swales, the colluvial deposits tend to be relatively thicker and may be subject to flow or slip downslope. Landslides Landslides were previously mapped on the site by Nilsen (1975) and Davenport(1986). ENGEO (1991, 1992, 1993, 1996) undertook more specific aerial photograph interpretations with field reconnaissance to map the site landslides. These landslides consist of active and inactive earthflows and larger slumpflow complexes. No debris flows were mapped on the site in an ENGEM (1992) debris flow study, and the potential for future debris flows is considered low. The most significant landslide activity on the property is located in the southern portion of the site, where much of the north-facing hillside is mantled by large active earthflows and slump flows. The relative landslide susceptibility map prepared by Davenport (1986) indicates that most of the hillside area of the site is classified as `generally' to `most susceptible' to landsliding. 4063.5.050.01 June 26, 2000 5 CAII EGO INCORPORATCD IV. Slope Instability Earth stability is the GHAD's prime geotechnical concern at this site. This is not unique to this project, but is of importance for hillside projects in the San Francisco Bay Area. This section describes several types of slope instability which are within the GHAD's responsibility, subject to the provisions of Section VI. Landslides are a common geologic phenomenon and are part of the process of mass wasting. Weathered or fractured bedrock and soil are transported downslope over geologic time as a result of gravitational and hydrostatic forces. Landslides and earth movement in this bedrock formation are typically rotational slumps and earthflows. Depth of movement is typically about 10 to 30 feet below the ground surface. Earthflows are confined to the upper 3-to 5-foot-thick clayey soil mantle. In the winter rainy season, these earthflows, can move at a rate of several feet per day. A landslide is a deposit of soil and/or bedrock moving downward from its original position under the influence of gravity. Landslides include a variety of morphologies and are further defined by type of materials, wetness, and mode of movement. They can consist of mass movements of earth materials that are primarily intact and occur along discrete shear surfaces. These surfaces (shear or slip planes) can be rotational (conchoidal or concave), such as for earth slumps, or planar, as for translational earth slide or bedrock block glides. Most landslides are truly "complex landslides", sliding, falling and flowing with more than one type of movement and/or material. Falls are an abrupt free-fall of earth materials off cliffs, steep cuts, or steep stream banks while earthfioM are mass movements of earth materials in which the type of movement is one of flowing. When composed of soil finer than gravel size, the flowing material is commonly called a mudflow. A debris flow/debris avalanche is composed of natural earth materials, artificial fill, 4063.5.050.01 June 26, 2000 6 EEO INCORPORATED and/or organic debris which flow downslope, with speed. Most of the material is transported away from the area of initial ground failure. Soil creep is the slow, often imperceptible, deformation of slope materials under low stress levels, which normally affects the shallow portion of the slopes, but can be deep seated where a weak zone of soil or bedrock exists. It results from gravitational and seepage forces, and may be indicative of conditions favorable for landsliding. Creep can be caused by wetting and drying of clays, by solution and crystallization of salts, by the growth of roots, by burrowing animals and by down slope movement of saturated ground. _Colluvium refers to the mantle of loose soil and weathered bedrock debris that progresses down hillsides by creep. The District shall also be concerned with erosion and sedimentation in open space or affecting developed lots or improvements, subject to the provisions of Section H. Erosion is defined as the process by which earth materials are loosened and removed by running water on the ground surface or in the subsurface. Sedimentation is the depositing or settling of soil or rock particles from a state of suspension in a liquid. Hilly terrain open space either in a natural condition or particularly on excavated slopes can be subject to erosion. Landslide deposits which are sometimes in a loosened condition are particularly prone to erosion. Earth flow-, debris flow- and mud flow-type landslides typically have an area of deposition or accumulation (sedimentation area) at their base. Graded slopes in the District, particularly those in,excess of 20 feet in vertical height or those not sufficiently vegetated, can be subject to erosion and therefore a source of transported sediment. Creek banks can be oversteepened by natural processes such as stream cutting and erosion, which can cause the banks to slump. The slumped material can then be transported downstream. Additionally, this can lead to destabilization of areas above the creek banks. In flood stage, streams such as Alamo Creek can erode even vegetated stream banks. 4063-5.050-01 June 26, 2000 7 ESM INCORPORATED V. Slope Stability Considem Ions Wendt Ranch consists of open,rolling, grass-covered hills with scattered trees. Two branches of the Alamo Creek are located on or adjacent to the subject property. In general, the northwestern half of the site is topographically subdued,while steeper hills are situated in the southeastern half of the site. In the past, the property has been used for cattle grazing. The majority of the natural hillslopes in Wendt Manch are in a marginally stable to unstable condition. However, some of the mapped landslides are located in areas of proposed development. In general, mitigating measures for land instability include avoiding large landslide areas when placing structures, or stabilizing the landslides by removing the unstable soil to bedrock, constructing engineered keyways, and recompacting the soil as drained engineered fill. mother technique is to provide drained toe-of-slope buttress fills with debris benches of sufficient width to intercept the potential landslide debris. Debris benches may be constructed as a preventive measure on selected perimeter cut slopes surrounding the development area. GHAI3 will maintain the debris benches and the hillslopes extending uphill from the benches. Generally, development of this site will be concentrated in the low-lying valley areas or on the southeastern ridgeline. The low-lying valleys will be filled to establish finish grades that are substantially higher than original elevations. Fill materials for grading will be generated from cuts on the surrounding hill slopes. This grading concept provides pad elevations above flood levels while, at the same time, improving the stability of the surrounding natural slopes through the use of buttress fulls and flatter slope gradients. Known active landslides which will be adversely affected by the proposed grading or which constitute a threat to the proposed development will either be completely removed and replaced as subdrained engineered fills, or buttressed with drained,engineered fills. 4063.5.050.01 June 26, 2000 8 EAGE-v INCORPORATED The cuts will be viewed by the project geologist during grading to provide mitigation schemes for unsuspected slope conditions which could decrease the slope stability. Such conditions include unfavorable bedrock attitudes and seepage conditions. A geology map will be prepared by the project geologist for use by the GHAD. In repaired or buttressed landslide areas, the landslide debris will be overexcavated to firm undisturbed materials below the landslide plane as determined by the Geotechnical Engineer or Engineering Geologist at the time of grading. In the case of the complete removal of a landslide, systems of surface and subsurface drains will be installed to collect the subsurface waters which may have initially caused the landslide. The configuration of each subdrainage system will be tailored to the individual landslide at the time of grading. The Geotechnical Engineer and/or the Engineering Geologist will determine the location and depths of subdrains at that time. A Licensed Land Surveyor will record the location and elevation of subdrains and outlets. Each landslide subexcavation then will be reconstructed to final grade by keying and benching below the landslide plan with a compacted drained engineered fill. Landslides that will not be completely removed either will be stabilized in place or are situated outside of the proposed development areas. Buttress fills will be constructed at the toes of major cut slopes near the base of known landslide areas. These fills consist of drained-engineered keyways, excavated to firm bedrock, with an overlying engineered fill. Debris benches will generally be constructed with concrete-lined ditches discharging into approved outlets. It is important to note that to preserve the natural topography, wildlife habitat, and vegetation of the site, stabilization of landslide masses is currently planned only for landslides that directly threaten the proposed improvements. Slope instability in open-space parcels which does not have the potential to affect directly the CHAD-accepted hornesites, roadways, or other improvements will not be repaired,as provided in Section VI. 4063.5.050.01 June 26, 2000 9 EAGa INCORPORATED Creek bank erosion that does not directly threaten site improvements, as provided in Section VI, will not be repaired, and the creeks will be allowed to mature naturally. 4063.5.050.01 June 26, 2000 10 EA EO INCORPORATED VI. Criteria for GHAD Responsibility In forming the GHAD and establishing the assessment levels and budgets for the District, it is important to define clearly the limits of the GHAD's responsibilities. The GHAD will accept responsibility for property as described in Section VII of this Plan of Control. However, the intent of this Plan of Control is not to extend the GHAD's responsibilities to every potential situation of slope instability; rather, the following are exclusions from CHAD responsibility: 1. Isolated or Remote Slope Instability The GHAD shall not have responsibility to monitor, abate, mitigate or control slope instability that does not involve damage to or pose a significant threat to damage site improvements. 2. Single ,Property The CHAD will not prevent, mitigate, abate or control geologic hazards which are limited in area to a single parcel of property unless the geologic hazard has damaged, or poses a significant threat of damage to site improvements located on other property within the CHAD boundaries. As used herein, the term "site improvements" means buildings, roads, sidewalks, utilities, improved trails, swimming pools, tennis courts,gazebos, cabanas, geologic stabilization features, or similar improvements. This exclusion does not apply to geologic hazards existing on open-space property owned by any homeowner's associations within Wendt Ranch. 3. Geologic Hazards Resulting From Negligence Of Property Owner The GHAD may, in the general manager's sole discretion, decline to prevent, mitigate, abate or control geologic hazards which occurred or resulted from any negligence of the homeowner and/or the homeowner's contractors, agents or employees in developing, investigating, grading, 4063.5.050.01 June 26, 2000 11 EAGEO INCORPORATED constructing, maintaining or performing or not performing any post-development work on the subject property. 4. Propert Not t Accepted The GHAD shall not have responsibility to repair damaged site improvements, which are situated on a parcel of real property, which the GHAD has not accepted in accordance with Section VII, below. The GHAD, however, may monitor, abate, mitigate or control slope instability on a parcel of real property which (1) the GHAD has not accepted in accordance with Section VUbelow, and (2) that is not excluded from GHAD responsibility by paragraphs 1 and 2; provided, however, that GHAD responsibility on such parcel shall be limited to the extent necessary to address damage or a significant threat to damage site improvements which are within a parcel of real property which the GHAD has accepted in accordance with Section VII, below. 4063.5.,050.01 June 26, 2000 12 EAGEO INCORPORATED VIL Acceptance 1. Activation of Assessment An annual assessment shall be promptly aut 'ized on all residential parcels in the GHAD. The assessment shall be levied by the GRAD on each individual residential parcel beginning the first fiscal year following issuance of a building permit for that parcel. 2 Responsibility for GRAD Activities The party that, on the date each Final Map within the boundaries of the CHAD is approved by Conte. Costa County, owns the developable parcels shown on that Final Map shall have the responsibility to perform all the activities of the CHAD on property within that Final Map. Such responsibility shall automatically transfer to the CHAD at 9.010 a.m. on the day exactly four years after the first residential building permit is issued by Contra Costa County, or two years after the completion of the initial mass, grading (as defined by the County-approved grading plans), whichever is later. This turn-over date may be extended at the sole discretion of the project developer provided that the assessments shall continue to be levied during the extension period and that notice of such extension is delivered to the District Manager at least 30 days prior to the turn-over date. The petitioners for formation of the CHAD intend that the approximately four year period between the levying of the CHAD assessment and the GHAD becoming responsible to perform activities on property within each Final Map will allow the District to accumulate reserve funds without incurring significant expenses. 4063.5.050.01 June 26, 2000 13 ESI G O INCORPORATED VM. 'Wendt Ranch Open Space Plan of Control The GHAD shall be responsible for oversight of the maintenance of geologic stabilization features (e.g. ditches, benches, walls, etc.) in the common open space and the unimproved areas including the hillside slopes extending uphill from debris benches and outside of the private lot boundaries. The GHAD's maintenance responsibilities include prevention, abatement, vegetation control, and control of landslide and erosion hazards within the subdivision open space and hillsides, as provided in Section Vl. General maintenance of the surface drainage improvements in the open space and on the hillsides, such as the concrete V--ditches, will be the GHAD's responsibility. The CHAD is also responsible for general maintenance of the storm drain inlets and outlets in open space and creek corridors and subdrain outlets. Potential geologic hazards such as landslides and slope erosion within the open space, including the unimproved hillsides, shall be the responsibility of the GRAD. Clearing of fire breaks and maintenance of the open space (other than hazard abatement) will be approved by the GRAD (as described in the Governing Documents of the Wendt Ranch Open Space Maintenance Plan) and funded by the GRAD Parcel Tax. General creek bank maintenance shall be the responsibility of Contra Costa County Flood Control and Water Conservation District. The GHAD's creek maintenance duties will include only the repair of substantial bank failures that directly damage or threaten actual site improvements (including buildings, utilities, and roads). Such creek bank improvements, including armoring of channels with rock or other materials, will be undertaken by the GRAD as necessary, and only to abate actual or threatened impact to site improvements. 4063.5.050.01 June 26,2000 14 EEO INCORPORATED DL Priority of GHAD Expenditures Emergency response and scheduled repair expenditures by the CHAD are to be prioritized by the General Manager, utilizing his discretion,based upon available funds and the approved operating budget. When available funds are not sufficient to undertake all of the identified remedial and preventative stabilization measures, the expenditures are to be prioritized as follows in descending order of priority: A. Prevention, mitigation, abatement or control of geologic hazards that have either damaged or pose a significant threat of damage to residences, critical underground utilities or paved streets. B. Prevention, mitigation, abatement or control of geologic hazards which have either damaged or pose a significant threat of damage to ancillary structures, including but not limited to the detention basin, pool cabanas or restroom buildings. C. Prevention, mitigation, abatement or control of geologic hazards which have either damaged or pose a significant threat of damage to open space amenities. D. Prevention, mitigation, abatement or control of geologic hazards existing entirely on open-space property and which have neither damaged nor pose a significant threat of damage to any site improvements. E. Prevention,.mitigation, abatement or control of geologic hazards which have either damaged or pose a significant threat of damage limited to loss of landscaping or other similar non-essential amenities. Q -d Er s azar cotmimical Technigues for MitigaLtion of Landslide an ion H ds The techniques which may be employed by the CHAD to prevent, mitigate, abate, or control geologic hazards include,but are not limited to,the following. 4063.5.050.01 June 26, 2000 15 EEO INCORPORATED A. Removal of the unstable earth mass. B. Stabilization (either partial or total) of the landslide by removal and replacement with compacted, drained fill. C. Construction of structures to retain or divert landslide material or sediment. D. Construction of erosion control devices such as gabions, riprap, geotextiles, or lined ditches. E. Placement of drained engineered buttress fill. F. Placement of subsurface drainage devices; (e.g. underdrains,or horizontal drilled drains). G. Slope correction (e.g. gradient change, biotechnical stabilization, slope trimming or contouring). H. Construction of additional surface ditches and/or detention basins, silt fences, sediment traps, or backfill or erosion channels. Potential landslide and erosion hazards can be mitigated best by controlling soil saturation and water runoff and by maintaining the surface and subsurface drainage system. Maintenance shall be provided for lined surface drainage ditches and drainage terraces including debris benches or drop inlets. Maintenance of the open space, including the clearing of fire trails, will be approved by the GHAD (as described in the Governing Documents of the Wendt Ranch Open Space Maintenance Plan). The CHAD will fund routine maintenance of the open space. The CHAD also shall monitor the use of the open space by other entities such as Contra Costa County Flood Control and Water Conservation District. 4063.5.050.01 June 26, 2000 16 EAGE0 INCORPORATED X Biotechnical Recommendations for Prevention and Mitigation of EAsting or Potential Erosion Hazards Fill slopes on this project may be expected to be as erodible as the cut slopes in bedrock. Therefore, maintenance of vegetative cover following grading is especially important on all slopes. Vegetation provides a protective role on soil and exposed rock. It absorbs the impact of raindrops, reduces the velocity of runoff, and retards erosion. In many instances, adequate erosion protection for slopes can be accomplished solely with carefully selected and placed biological elements (plants) without the use of structures (e.g. brush layering and willow waddling). In other areas, biotechnical slope protection may involve the use of mechanical elements or structures in combination with.biological elements to provide erosion control and help prevent small scale slope Mures., Locally, crib walls, welded-wire walls, gabion walls, rock walls, riprap, and reinforced earth walls used in combination with carefully selected and planted vegetation can provide high quality slope protection. The vegetation may be planted on the slope above a low retaining structure or toe wall, or the interstices of the structure can be planted. 4063.5.050.01 June 26, 2000 17 EAGM INCORPORATED XI. Maintenance and Monitoring Schedule The site inspections should be undertaken a minimum of three times per year. The CHAD budget should provide for four or more inspections in years of heavy rainfall. The inspections should take place in October,prior to the first significant rainfall;mid-winter as necessary during heavy rainfall years; and in early April at the end of the rainy season. The frequency of the inspections should increase depending upon the intensity and recurrence of rainfall. Site inspections should increase sufficiently to provide for mitigation of potential hazards. Figure 2 is the draft Geologic Map and Testing and Observation Report that will be finalized when the as-built drawings are available. The CHAD Manager shall keep these reports on file in the records of the CHAD. • The engineer and/or geologist retained by the District should carry out an inspection of lined surface ditches at least twice a year. One inspection should be in the fall prior to the onset of winter rains. The inspection shall check for sedimentation and cracking or shifting of the concrete lined ditches. Repairs and maintenance as needed should be undertaken including removal of excess silt or sediment in ditches and patching or replacement of cracked or broken ditches,prior to the beginning of the next rainy season. • Subsurface drain outlets and horizontal drilled drain outlets, if any, should be checked. Water flowing from these outlets should be measured and recorded during each inspection. The inspections should take place at least twice annually, preferably in the fall and spring. Any suspicious interruption lin flow should signal a need to unplug or clean by flushing the affected drain. • Piezometers to measure ground-water levels, or instruments such as inclinometers or tiltmeters measuring potential slope instability should be monitored quarterly,if installed. • Settlement monitoring devices should be measured annually and tracked. In the event of anomalous readings or excessive settlement,the monitoring frequency should be increased to once per quarter. 4063.5.050.01 June 26, 2000 18 EAGEO INCORPORATED • Inlets, outfalls or trash racks, if used, must be kept free of debris and spillways maintained. It is anticipated that initially at least once every two (2) years, cleanup of vegetation and removal of silt would be in order. Attention should be given to plantings or other obstructions which may interfere with access by power equipment. • The creek corridors should be inspected at least twice a year. One inspection should be in the fall prior to the onset of winter rains. A second inspection should be undertaken during the rainy season to monitor potential creek bank failures which could imminently threaten or damage site improvements. The maintenance program should include the monitoring of the subdrain outfalls from the mass grading operations which outlet to the creek in a number of locations along the creek bank. • An annual inspection shall be made by the engineer and/or engineering geologist to assess the effectiveness of the preventive maintenance program and to make recommendations as to which landslide or erosion measures should be undertaken in the next fiscal year. Any appropriate site-specific study of landslide or erosion conditions shall be determined at that time. Consultants, if necessary, will be retained to undertake the needed studies. An annual inspection report to the CHAD shall be prepared by the District Engineer and/or engineering geologist. 4063.5.050.01 June 26, 2000 19 EEO INCORPORATED SELECTED REFERENCES Association of Bay Area Governments (ABAG), 1981, Manual of Standards for Erosion and Sediment Control Measures. Axelrod, D. I., 1944a, The Back Hawk Ranch Flora, in Pliocene Floras of California and Oregon, R. W. Chaney, ed. Carnegie, Inst. Washington Publication No. 553: 91-1011, 2 pis. Axelrod, D. I., 1944b,The Pliocene Sequence in Central California. Ibid.: 207-224, 1 Fig., 1 tab. Blake, T. F., 1994, EQFAULT, A Computer Program for the Deterministic Prediction of Peak Horizontal Acceleration from Digitized California Faults. Bonilla, M. G., 1982, Evaluation of Potential Surface Faulting and Other Tectonic Deformation, USGS Open-File Report 82-732. Borcherdt, R. D., J. F. Gibbs, and R. Lajoie, 1975, Prediction of Maximum Earthquake Intensity in the Southern San Francisco Bay region, California, for larger Earthquakes on the San Andreas and Hayward Faults, USGS MF 709. Brabb, E. E., H. S. Sonneman, and J. R. Switzer, Jr., 1971, Preliminary Geologic Map of the Mount Diablo-Byron Area, Contra.Costa,Alameda and San Joaquin Counties, California: U.S. Geol. Survey Basic Data Contr. 28, scale 1:62500. Brabb, E. E., H. S. Sonneman, and J. R. Switzer, Jr., 1974, California ail and Gas Fields, 1974, Vol. II, South Central Coastal and Offshore California: Cal. Div. Oil and Gas, Report.n, Tr. 12. California Division of Mines and Geology, January 1, 1982, State of California Special Studies Zone,Diablo 7-Y7' Quadrangle. Clark, M. M., 1980, Ground Rupture and Seismic Shaking as Separate Hazards of Active Faults (A Study of Active Faulting in the Ojai Valley, Southern California), in Proceedings of the Eighteenth Annual Engineering Geology and Soils Engineering Symposium. Contra Costa County, 1975, Seismic Safety Element, Technical Background Report. Crane, Ron and Craig Lyon, 1995, Geology of the Mount Diablo Region Field Trip Guidebook: Northern California Geological Society, Diablo 7-Ys' Quadrangle, Scale 1:24,000. 4063.5.050.01 June 26, 2000 EAGEO INCORPORATED SELECTED REFERENCES (Continued) Darrow, R. L., 1976, Mount Diablo Segment of the Mg anon Channel: in: Reith Drummond, ea., Pac. Secs. A.A.P.G.-S.E.G.S.E.P.M. Joint Annual Field Trip San Francisco, April 24, 1976, p. 2533. Davenport, C. W., 1986, Landslide Hazards in Parts of the Diablo and Dublin 7-V2 Quadrangles, Contra Costa County, California, CDMG Open-File Report 86-7 SF. Dibblee, T. W. Jr., 1980, Preliminary Geologic Map of the Diablo Quadrangle, Alameda and Contra Costa Counties, California, USGS Open File Report 80-546. ENGEO Inc., 1991, Preliminary Geologic Mapping, TVPOA Property, Contra Costa County, California; Project No. 3294-W1. ENGEO Inc., 1992, Debris Flow Hazard Characterization, TVPOA Planning Area, Tassajara Valley, Contra Costa County, California; Project No. N2-3293-W3. ENGEO Inc., 1993, Preliminary Geotechnical Field Exploration, TVPOA Planning Area, Tassajara Valley, Contra Costa County, California; Project No. 3284-W4. ENGEO Inc., 1996, Geotechnical and Geological Assessment, Wendt Ranch, Subdivision 8002, Contra Costa County, California; Project No. 4063-W1. ENGEO Inc., 1996, Geotechnical Exploration, Wendt Ranch, Subdivision 8002, Contra Costa County, California; Project No.4063-W1,October 15, 1996. Federal Emergency Management Agency, 1987, National Flood Insurance Program, Flood Insurance Rate Map(FIRM), Panel Number 060025 0475B. Graham, S. A., C. Gavigan, C. McCloy, M. Hitzman, R. Ward, and R. Turner, 1983, Basin Evolution during the change from convergent to Transform Continental Margin: An Example from the Neogene of Central California, in Field Trip Guidebook, Pacific Section SEPM, May 1983. Gaymer, R. W., D. L. Jones and E. E. Brabb, 1994, Preliminary Geologic Map Emphasizing Bedrock Formations in Contra Costa County, California, Open-File Report 94-622. Hart, 1981,Fault Evaluation Report 110, Diablo Quadrangle, C.D.M.G. unpublished report. Helley, E. J., and D. G. Herd, 1977, Faults with Quaternary Displacement, Northwestern San Francisco Bay Region, California,USGS MF 818. 4063.5.050.41 June 26, 2000 E GEO INCORPORATED SELECTED REFERENCES (Continued) Herd, E. G., 1977, Geologic Map of the Las Positas, Greenville and Verona Faults, Eastern Alameda County, California. U.S.Geology Survey Open-File Report 77-689, 25 p. Herd, E. G., 1978, Map of Quaternary Faulting Along the Northern Calaveras Fault Zone: Las Trampas Ridge, Diablo Dublin, Niles and La Costa 71/2-minute Quadrangles, California, Sheet 1 USGS Open-File Report 78-307. Idriss, I. M., 1993, Procedures for Selecting Earthquake Ground Motions at Rock Sites, National Institute of Standards and Technology, NIST GCR 93-625,7pp. International Conference of Building Officials, 1994,Uniform Building Code. Isaacson, K. A., 1990, Late Tertiary Sedimentation in the Northern Livermore Basin, California; Unpublished Masters Thesis,San Jose State University. Lawson, A. C., 1914, Description of the San Francisco District: U.S. Geol. Survey Atlas, Folio 193,24 p., scale 1:62500. Limerinos, J. T., J. S. Lee, and P. E. Lugo, 1975, Flood Prone Areas in the San Francisco Bay Region, USGS Open-File Report(Water Resources Invest 37-73). Majmundar, H. H., 1996, Landslide Hazards in the Las Trampas Ridge Quadrangle and Parts of the Diablo Quadrangle, Alameda and Contra Costa Counties, California, California Division of Mines and Geology OFR 95-15. Nilsen, T. H., and S. H. Clarke, Sedimentation and Tectonics in the Early Tertiary Continental Borderland of Central California: U.S.Geol. Survey Prof.Paper 925, 64 p. Nilsen, T. H., 1975, Preliminary Photointerpretation Map of Landslide and Other Surficial Deposits of the Diablo 7%' Quadrangle, Alameda and Contra Costa Counties,California; USGS Open File Map 75-277-14. Pacific Aerial Surveys, October 1, 1991, Aerial Photographs,Tassajara Valley 1-3 and 1-4. Pampeyan, E. H., 1963, Geology and Mineral Deposits of Mount Diablo, Contra Costa County, California. California Division of Mines and Geology Special Report 80, 31 p., 5 pls. Richey, K. A., 1938, Osteoborus Diabloensis, a new dog from the Black Hawk Ranch fauna, Mount Diablo, California. The Cordon, 24: 303.308, 1 Figure. 4063.5.050.01 June 26,2000 E GO INCORPORATED SELECTED REFERENCES (Continued) Richey, K. A., 1948. Lower Pliocene Horses from Black Hawk Ranch, Mount Diablo, California. Ibid., 28: 144, 3 pls., 13 figs. Rogers, J. D., 1986, Landslide Processes of the East Bay Hills and San Francisco Bay Region, California, AEG Field Trip Guidebook, 29h Annual Meeting. Ruggeri-Jensen-Azar&Associates, Wendt Ranch, Key Map, dated March 26, 1996. Sarna-Wojicki, A. M., 1976, Correlation of late Cenozoic Tuffs, in the Central Coast Ranges of California by Means of Trace— and Minor—Element Chemistry: U.S. Geologic Survey Professional Paper 972, 30 p. Saul, R. B., 1967, The Calaveras Fault Zone in Contra Costa County, California, California Division of Mines and Geology Mineral Information Service, Volume 20,Number 3. Savage, E. E., B. A. Ogle, and R. S. Creeiy, 1951, Subdivision of Vertebrate-Bearing Non- Marine Pliocene Rocks in West Central Contra Costa County, California. Geologic Society America Bulletin, V.62. Savage, E. E., B. A. Ogle, and R. S. Creeiy, 1955, Nonmarine Lower Pliocene Sediments in California, A Geochronologic-Biostratigraphic Classification. Ibid., 31. 1-26, 13 figures. Savage, E. E., B. A. Ogle, and R. S. Creely, 1982, Stratigraphy of Upper Tertiary, Nonmarine Rocks of Central Contra Costa Basin, California, in SEPM-Cenozoic Nonmarine Deposits of California and Arizona. State of California, Department of Conservation, 1987, Erosion and Sediment Control Handbook, EPA 440/3-78-003. Taff, J. A., 1935, Geology of Mount Diablo and Vicinity: Geol. Soc. America Bull. v. 46, p. 1029-1100,map. USDA, 1977, Soil Survey of Contra Costa County, California; U.S. Department of Agriculture, Soil Conservation Services. Varnes, D.J., 1978, Slope Movement Types and Processes, in Landslides, Analysis and Control, Special Report 176,Transportation Research Board. 4063.5.050.01 June 26, 2000 FNGE0 INCORPORATED SELECTED REFERENCES (Continued) Wagner, J. R., 1978, Late Cenozoic History of the Coast Ranges East of San Francisco Bay, Unpublished Ph.D., U.C. Berkeley. Wentworth, C.M., S. Ellen, V. A. Frizzell, Jr., and J. Schlocker, Map of Hillside Materials and Descriptions of their Engineering Character, San Mateo County, California, USGS Miscellaneous Investigation Series Maps I-1275-D. Wesnousky, 1986, Earthquakes, Quaternary Faults, and Seismic Hazard in California, Journal of Geophysical Research,Vol. 91 No.B 12. 4463.5.050.01 June 26, 2000 __ _ __ �'�°=� sx.Sr L F I TJ R. EAG EV INCORPORATED LIST OF FIGURES Figure 1 Grading Plan and GHAD Boundary Figure 2 Geology Map 4063.5.050.01 ,June 26, 2000 00 � 1 { � Glc eou.uviUM { Q01 ALLUVJUK f' Ot LANDSLtDE f { Tpi GREEN VALLEY/TASSAJARA CROUPIt Qd { Qd If t �l !Y t t :f / ol oell BASE AIAP SO OCC. dk ASSOCU ra bgn'R C SC ALB I: 000 tiEA'L043Y M kP PMDJ t tw.:40633AS"l Imunt"0 WEND L'XANM.SI.TBDrMION 3002 OAM MAY 2000 Geologic Hazard Abatement Districts (GHAD s) Policies & Procedures related to Formation Section 25550 et seq. of the Public Resources Code provides procedures for formation of Geologic Hazard Abatement Districts (GHAD). Requests for formation of a GHAD may be initiated as follows: 1. Developer Initiated (generally undeveloped property). A developer and/or the owner of a property that is proposed for development may petition the Board to form a Geologic Hazard Abatement District in order that in the future the subdivided parcels can receive geologic hazard abatement services. 2. Property Owner Initiated(generally developed property). A property owner (or group of property owners)may petition the Board to form a district in order that the existing subdivided property can receive geologic hazard abatement services. 3. Board of Directors Initiated. The Board of Supervisors can,by Resolution, initiate proceedings to form a GHAD. Procedure. In order that formation requests may be received,processed, reviewed and acted upon in a uniform and timely manner,the Board hereby adopts the following general policy with respect to the formation of GHADs: 1. Formation proceedings shall be initiated either by a Resolution adopted by the Board, or by a petition signed by owners representing not less than 10%of the property proposed to be within the boundaries of the new GHAD. The signature(s) on the petition shall be dated and include information sufficient to identify the signature(s) as that of the owner(s)of land within the area of the proposed GHAD. 2. Except when waived in writing by the General Manager or approved by the Board of Directors, and not otherwise required by state law,the following information shall be submitted to the Board of Directors by the applicant along with any petition for formation of a GHAD: a. A statement that the petition is made pursuant to Division 17 of the California Public Resources Code. b. A detailed map of the area showing property boundaries,proposed development areas, areas proposed to be maintained as open space and assessor's parcel numbers. The area proposed for inclusion in the GHAD shall be clearly identified. A plat map and legal description of the area shall be provided in a form acceptable to the General Manager. c. The applicant will supply copies of any and all existing geotechnical and/or engineering reports, of which the applicant is aware,prepared in Wiedemann Ranch GHAD page 1 of 3 Annexation Policy conjunction with any current or prior development proposals on the property. d. A proposed Plan of Control,within the meaning of Public Resources Code § 26509, prepared by a certified engineering geologist describing in detail the specific geologic hazard(s)within the boundaries of the proposed GHAD which the owners are requesting that the GHAD prevent,mitigate, abate or control and providing a plan therefore. e. If the proposed Plan of Control identifies facilities or activities that the applicant proposes that the GRAD be responsible for installing and/or maintaining(drainage facilities; flood control detention or retention basins; retaining walls; open space or other facilities (or activities)); etc, the applicant shall provide detailed drawings of said facilities, including engineering plans and/or other documentation as may be appropriate. f. An analysis of annual expenses anticipated to be incurred by the GRAD in preventing,mitigating, abating or controlling said geologic hazard(s) within the area of the proposed GHAD. g. A report prepared by a certified public accountant, or other professional possessing similar qualifications, to determine the financial situation of the proposed CHAD, including recommended funding methodology and reserve accounts. This report shall include recommendations as to how CHAD operations should be funded including bonds and/or annual assessments,which the GHAD will need to receive in order to provide the services identified in the proposed Plan of Control. h. A report prepared by a certified public accountant, or other professional possessing similar qualifications,to determine the level of financial contribution that the owners of the property should be required to pay into a GRAD reserve fund. At a minimum,the calculation of the amount of contribution to the reserve account shall consider the following: i. The geographical size of the area proposed to be included in the GHAD; and ii. An estimate or projection of the financial resources that the GHAD will require to respond to potential conditions and anticipated damage-in the area in the future due to the geologic hazard(s) identified in the proposed Plan of Control. i. If applicable, copies of the conditions of approval for the project from the approving agency, indicating the requirement to form a GHAD. The applicant shall provide copies of the approved tentative map and/or site plans as well as grading and site improvement plans and documentation of any required environmental mitigations that might impact the GHAD's ability to prevent,mitigate, abate or control the specific geologic hazard(s) identified in the proposed Plan of Control. The applicant shall provide copies of any state and/or federal agency permit requirements that might Wiedemann Ranch CHAD page Z of S Annexation Policy ell � impact the GHAD's ability to prevent,mitigate, abate or control the geologic hazard(s)identified in the proposed Plan of Control. j. A right-of-entry to allow GHAD personnel to inspect the property prior to formation and a statement and/or description of procedures under which GHAD personnel will have access to individual properties for the purpose of investigating, evaluating,preventing,mitigating,abating and/or controlling the geologic hazard(s) identified in the proposed Plan of Control once the GHAD is formed. k. Such compensatory fees as may be required applicable to the filing, processing and hearing of the petition and any financing for the services to be provided to the area proposed to be included in the boundaries of the GAHD. 3. Upon receipt of the petition and accompanying information,the Board Clerk shall place it on the agenda for the first regular Board meeting following the Clerk's determination that the petition substantially complies with the requirements of Public Resources Code §§ 26551 and 26552 as well as the requirements set forth in paragraphs 2. a. though k. above. To make this determination,the Clerk may refer the petition to the Public Works Director for review, evaluation and recommendation. 4. The Public Works Director's review, evaluation and recommendation shall do the following: a. Evaluate the petition to determine if is substantially in the form required by Public Resources Code §§ 26551, 26552, 26553 and 26555, and b. Evaluate the proposed Plan of Control to determine if it complies with the requirements of Public Resources Code §§ 26509 and 26553, and c. Evaluate the reports and materials submitted in compliance with paragraphs 2. a. though k. above to determine if they are complete and sufficient, and d. Present his findings and recommendations to the Clerk of the Board. 5. If the Clerk determines that the petition does not comply with the law and/or the requirements set forth herein, the Clerk must give written notice to the landowner whose signature appears first on the petition. A supplemental petition curing the defects may be submitted to the Clerk within 10 days of the date of the mailed notice. 6. Upon the Clerk's presentation of a sufficient petition and the applicant's compliance with the requirements set forth herein, the Board shall adopt a resolution setting a public hearing on the petition and direct the Clerk to give notice. The Clerk must notice the public hearing at least 20 days before the hearing date. Notices must be mailed first-class,postage prepaid,to each owner of real property to be included in the proposed GHAD and include: a. The time,date and place of the public hearing; a brief description of the purpose of the hearing; the location where the Plan of Control can be Wiedemann Ranch CHAD page 3 of 5 Annexation Policy reviewed or duplicated; the address where objections to the proposed formation can be mailed or delivered up to and including the time of the hearing. b. A copy of the petition. 7. At any time up to the time of the hearing, any owner(s) of real property in the area to be included in the proposed GHAT)may make a written objection to the proposed formation. The objection must be signed by the property owner(s) and contain a description of the owner(s) land by lot,tract and map number. If the person who signs the objection is not shown on the assessment role last equalized by the County as the owner(s) of the subject real property,the written objection shall be accompanied by evidence sufficient to indicate that the person is the owner of the property. 8. The Board shall open the public hearing on the date and at the time noticed by the Clerk. During the hearing,the Board shall be presented with any written objections. a. The Board may adjourn the hearing but not to exceed 60 days from the date first noticed. b. If owners of more than 50% of the assessed valuation of the land to be included in the proposed CHAD object to formation of the CHAD,the Board shall close the hearing and terminate the proceedings. 9. When considering the proposal to form a new GHAD and the adoption of resolution of approval,the Board may review some or all of the following factors and items. a. Whether the petitioner has complied with all of the requirements of the Public Resources Code Sections 26550 et. seq. and 26561 et. seq. and the requirements set forth herein. b. Whether the GRAD has sufficient administrative personnel and technical support necessary to assume the proposed GRAD responsibilities within the proposed GRAD and whether any administrative and/or support costs resulting from the formation of the GRAD will borne by the property owners within the boundaries of the proposed GRAD. c. Whether sufficient fees and/or assessments necessary to prevent,mitigate, abate or control the specific geologic hazard(s)identified in the proposed Plan of Control and to administer operation of the GHAD consistent with the Plan of Control can be legally levied on properties within the boundaries of the area to be included in the proposed CHAD. d. Whether the proposed or recommended financial contributions, from the developer and/or property owner(s), to the reserve fund of the existing CHAD are reasonable and sufficient to support the proposed GRAD operations. 10. At the same time as the Board conducts the public hearing to consider whether the proposal to form a GHAD should be approved,the Board may also conduct a Wiedemann Ranch GRAD page 4 of 5 Annexation Policy public hearing to consider the levying of special benefit assessments or other methods of financing the additional expenses anticipated to be incurred by the GHAD in providing services to prevent, mitigate, abate,or control geologic hazards within the area proposed to be annexed as defined in the Plan of Control. If special benefit assessments are proposed, the notice and public hearing shall comply with the Right to Vote on Taxes Act(Cal. Const., art. XIII, § 4) and implementing statutes. 11. Pursuant to section 26581, an annexation shall not become final until the Contra Costa Board of Supervisors, as the body that ordered formation of the Wiedemann Ranch GRAD, adopts a resolution approving the annexation. 12. If desired, the Board may provide that the annexation shall not become final until the special benefit assessments or other method of financing the services to be provided to the annexed area have been duly approved, as required by law. In addition,the Board may apply to the annexation any other conditions that the Board deems necessary or desirable. Wiedemann Ranch GHATS page 5 of 5 Annexation Policy ell TO: BOARD OF SUPERVISORS, as the Governing Body of the Contra Costa County Flood Control and Water Conservation District FROM: MAURICE M. SHIU, CHIEF ENGINEER DATE: OCTOBER 17, 2000 SUBJECT: SAN RAMON CREED.- 1456 Paseo Nogales Road,Alamo Project No.: 7520-6B8562 I. Recommended Action: A. APPROVE and ACCEPT the Amendment to Rental Agreement between John and Laura Huie and Contra Costa County Flood Control and Water Conservation District. B. AUTHORIZE the Chief Engineer to execute said Amendment to Rental Agreement on behalf of the District. II. Financial Impact: None. III. Reasons for Recommendations and Background: John and Laura Huie have been occupying the property since June of 1999. At that time, the District intended to sell the property within 3 to 6 months;however due to zoning requirements,the District was not been able to sell the property at a public auction within the time frame previously set. Therefore, it is necessary for the District to amend the Rental Agreement. The District plans to sell the property within 5 to 8 months. IV. Consequences of Negative Action: The property will be vacant and could become an attractive nuisance. The District would suffer a financial loss if the property were to be vandalized. Continued on Attachment: SIGNATURE: RECOMMENDATION OF COUNTY ADMINIS RAT _RECOMMENDATION OF BOARD COMM T APPROVE OTHER SIGNATURE(S): ACTION OF BOARD ON (}CIDBER 17; 200YPROVED AS RECOMMENDED_OTHER VOTE OF SUPERVISORS I hereby certify that this is a true and correct X UNANIMOUS(ABSENT NONE ) copy of an action taken and entered on the A'Y'ES: NOES: minutes of the Board of Supervisors on the ABSENT: ABSTAIN: date shown. LO:G1, OCTOBER 17 2000 G:1GrpData\RealFrop\2600-FileslHOs&RES1Bt)17huie.doc ATTESTED: � Orig.Div: Public Works(R/P) PHIL BATCHELOR, Clerk of the Board of Contact: L Lucy Owens(313-2229) Supervisors and County Administrator cc: County Administrator P.W.Accounting By Deputy fr TO: BOARD OF SUPERVISORS, CONTRA COSTA COUNTY FROM: MAURICE M. SHIU,PUBLIC WORKS DIRECTOR DATE: October 17, 2000 SUBJECT: Execute an agreement with the U.S. Environmental Protection Agency for a CALFED grant for the Knightsen Water Quality and Drainage Improvement Project,Knightsen area. SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION I. Recommended Action: AUTHORIZE the Public Works Director to execute an agreement with the U.S. Environmental Protection Agency for a CALFED grant for the Knightsen Water Quality and Drainage Improvement Project, in the amount of$100,000, Knightsen area. IL Financial 1mgact: There is no financial impact to the County. The grant is 100 percent funded by CALFED with no local match. Continued on Attachment:_ SIGNATURE: TMUMM]KNEINHUN UIr UOUNTY A' NITNISTRATUR RECOMMENDATION OF BOARD COMMITTEE APPROVE —OTHER SIGNATURE(S); TION OF BOARD ON OMBER 17, 20 PROVED AS RECOMMENDED-X—OTHER VOJE OF SUPERVISORS I hereby certify that this is a true and correct UNANIMOUS(ABSENT NONE Copy of an action taken and entered on the minutes of AYES:—NOES:- the Board of Supervisors on the ABSENT:—ABSTAIN: date shown. GAftD"\FldC"drninistr&don\Bo&rd Orders\20W DO\10/1 7/00.doc Orig.Div: Public Works Flood Control coutoct: YL Emish(313-2233) ATTESTED: OCIOBER 17, 2000 CAO County Counsel PHIL BATCHELOR, Clerk of the Board PW Accounting S.Cmicrell,KTAC of Supervisors and County Administrator By 24!�� A�; "W, Deputy SUBJECT: Execute an agreement with the U.S. Environmental Protection Agency for a CALFED grant for the Knightsen Water Quality and Drainage Improvement Project, Knightsen area. DATE: October 17, 2000 PAGE 2 Ill. Reasons for_Recommendations and Background: The grant has two components and will fund two separate processes in the Knightsen area. First, a community services district will be established to act as a mechanism to maintain future drainage improvements,in the town of Knightsen,that will be constructed to alleviate historic flooding problems in the area. Second, a feasibility study will be conducted for a regional bio-filter facility to accept storm runoff and treat it prior to discharging it back into the Delta. IV. Consequences of Mega-t--t eAction: If the agreement is not executed, the County will not receive the grant money.