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Home My WebLink AboutMINUTES - 06052007 - C.21 c. z1 TO: BOARD OF SUPERVISORS Contra FROM: MAURICE M. SHIU, PUBLIC WORKS DIRECTOR o u s Costa L l DATE: June 05' 2007 County S>a'cburi`c't SUBJECT: DETERMINE that the Pine Creek Detention Basin Culvert Desilt is a California Environmental Quality Act Class 4g Categorical Exemption; APPROVE the project and AUTHORIZE the Public Works Director, or designee, to advertise the project, Walnut Creek area. (Flood Control Zone 3B Funds) (District III) [CDD-CP# 07-10] Project No. 7520-6139355 SPECIFIC REQUEST(S) OR RECOMMENDATION(S) &BACKGROUND AND JUSTIFICATION RECOMMENDED ACTION: DETERMINE that the Pine Creek Detention Basin Culvert Desilt project is a California Environmental Quality Act (CEQA) Class 4g Categorical Exemption, and DIRECT the Director of Community Development to file a Notice of Exemption with the County Clerk, and AUTHORIZE the Public Works Director to arrange for payment of a $25 fee to Community Development for processing, and a$50 fee to the County Clerk for filing the Notice of Exemption, and APPROVE the project, and AUTHORIZE the Public Works Director, or designee, to advertise the project. �JContinued on Attachment: ❑ SIGNATURE: [RECOMMENDATION OF COUNTY ADMINISTRATOR ❑ RECOMMENDATION OF BOARD COMMITTEE [[]APPROVE ❑ OTHER SIGNATURE(S): ACTION OF BOR ON ✓Gti �'� v �. �C�"� APPROVED AS COMMENDED OTHER ❑ VVE OF SUPERVISORS UNANIMOUS(ABSENT »y ) I hereby certify that this is a true and correct copy of an action AYES: NOES: taken and entered on the minutes of the Board of Supervisors on ABSENT: ABSTAIN: the date shown. NA:sj 2 G:\EngSvc\ENVIRO\BO\2007\(06-05707)CEQA-Pine Creek Detention Basin.doc ATTESTED: ✓0 d s 7 Orig.Div:Public Works(Environmental Section) JOHN CULLEN,CLERK OF THE BOARD OF SUPERVISORS Contact: Ngozi Ajawara,(313-2311) AND COUNTY ADMINISTRATOR cc: Administrator—Attu. E.Kuevor Auditor-Controller J.Ring-Reaves,Community Development J.Wong,Maintenance By Deputy C. Sellgren,Environmental Accounting SUBJECT: DETERMINE that the Pine Creek Detention Basin Culvert Desilt is a California Environmental Quality Act Class 4g Categorical Exemption; APPROVE the project and AUTHORIZE the Public Works Director or designee to advertise the project, Walnut Creek area. (Flood Control Zone 3B Funds) (District III) [CP# 07-10] Project No. 7520-6B9355 DATE: June 05, 2007 PAGE: 2 of 2 FISCAL IMPACT: There is no impact to the County General Fund. The estimated project cost is $53,000.00 and is funded by Flood Control Zone 3B. REASONS FOR RECOMMENDATIONS AND BACKGROUND: The purpose of this project is to desilt the Pine Creek box culvert between the Pine Creek Detention Basin and Pine Creek. Pine Creek Detention Basin box culvert is approximately half full of silt. The Division of Safety of Dams met with Contra Costa County on October 11, 2006 and has requested that the box be desilted. As time passes, more sediment builds up at the bottom of the culvert causing increasing difficulties for the maintenance of the culvert. The desiltation will allow a higher flow within the culvert and cleaner flow from the Detention Basin to Pine Creek. The project will desilt an 8 ft. x 8 ft. box culvert that spans approximately 250 ft. in length from the basin to the mouth of Pine Creek. The trash rack located on the southern end will need to be desilted so that the flows will transition smoothly into the box culvert. The creek bed upstream and downstream of the box culvert will also be desilted to remove the silt and debris that has accumulated over time and to conform the stream channel to upstream and downstream reaches. Sediment from approximately 150 feet upstream and 150 feet downstream of the culvert,including 100 feet from a tributary will be scooped out. Approximately 1220 cubic yards of silt will be removed from the project site. The impacted area(including the culvert) will be 0.1 acre. Dewatering is not anticipated since the creek is typically dry during the summer months. Although not anticipated, trimming and/or removal of existing trees may be necessary for the construction of this project. Right-of-way utilities may be needed and utilities may need to be relocated. The project will not result in the removal of any scenic resource. CONSEQUENCES OF NEGATIVE ACTION: Delay in approving the project will result in a delay of design and construction and may jeopardize funding. Contra PUBLIC WORKS DEPARTMENT Costa INITIAL STUDY OF Countv ENVIRONMENTAL SIGNIFICANCE PROJECT# 7520-6B-935 CP# 07-10 PROJECT NAME: Pine Creek Detention Basin Desilt PREPARED BY: Ngozi jawara/?'z7D DATE: March 14, 2007 APPROVED BY: + DATE: P07 RECOMMENDATIONS: ® Categorical Exemption (Sec. 15304-Class 4g) ❑ Negative Declaration ❑ Environmental Impact Report Required ❑ Conditional Negative Declaration The project will not have a significant effect on the environment. The recommendation is based on the. following: The project will consist of minor alteration in the condition of land,water and vegetation,which will not involve removal of mature scenic trees or riparian habitats. What changes to the project would mitigate the identified impacts: N/A USGS Quad Sheet: Walnut Creek Base Map Sheet#: N-15& N-1 6 Parcel#: N/A GENERAL CONSIDERATIONS: 1. Location: The project is located between Pine Creek Detention Basin and Pine Creek near the.end of Trails End Drive in Walnut Creek. (Figs. 1-4) 2. Project Description: The purpose of this project is to desilt Pine Creek box culvert.between the Pine Creek Detention Basin and Pine Creek.Pine Creek Detention Basin box culverthas approximately four feet ofsilt.The Division of Safety Dams met with Contra Costa County-on October 11,2006 and has requested that the box be desilted.As time passes,more sediment builds up at the bottom of the culvert causing increasing difficulties for the maintenance of the culvert. The desiltation will allow a higher flow within the culvert and cleaner flow from the Basin to Pine Creek. The project will desilt an 8ftx8tt box culvert that spans approximately 250ft in length from the basin to the mouth of Pine Creek.The trash rack located on the southern end will need to be desilted so that the flows will transition smoothly into the box culvert. The creek bed upstream and downstream of the box culvert will be desilted to remove the silt and debris that has accumulated over time. Sediment from approximately, 150 feet upstream and 150 feet downstream of the culvert, including 100 feet from the overflow area will be scooped out. Approximately, a total of 1220 CY of silt will be removed from the project site. The impacted area(including the culvert) will be 0.1 acre. Dewatering is not anticipated since the creek is typically dry during the summer months. Although not anticipated, trimming and/or removal of existing trees may be necessary for the construction of this project. Right-of-way utilities may be needed and utilities may need to be relocated. 3. Does it appear that any feature of the project will generate significant public concern? [—] yes ®no ❑maybe (Nature of concern): 4. Will the project require approval or permits by other than a County agency? ®yes ❑ no Agency Name(s): California Department of Fish and Game, U.S. Army Corps of Engineers, Regional Water Quality Control Board, U.S. Army Corps of Engineers 5. Is the project within the Sphere of Influence of any city? Walnut Creek G:\EngSvc\ENV1R0\Flood ControlTine Creek Detention Basin Desilt\CEQA\Initial Study(CE).doc Updated 11/2/04 CALIFORNIA ENVIRONMENTAL QUALITY ACT Notice of Exemption Contra Costa County Community Development Department 651 Pine Street, 4th Floor-North Wing, McBrien Administration Building Martinez, CA 94553-0095 Telephone: (925) 313-2311 Contact Person: Ngozi Ajawara, Planner I, Public Works Dept. Project Title, Description, Common Name (if any) and Location: Project No. 7589-6D8492 CP # - Project Description: The purpose of this project is to collect soil from the basin site by DeSilva Gates Construction to use as a fill material on another site. This will assist the District by making progress towards excavating the ultimate basin configuration and provide the contractor with a local borrow site.The proposed work will include only removal of soil material from the basin. The bottom of the interim basin is currently at elevation 96 and the elevation will be held constant so that the basin will continue to drain through the existing primary spillway. Although no work will be conducted in or near the creek, a wildlife survey will be conducted to make sure environmental sensitive areas at the basin site will not be impacted. Project Location: The project is located near the intersection of Fairview and Sand Creek Road in the City of Brentwood. This project is exempt from CEQA as a: ❑ Ministerial Project(Sec. 15268) ❑X Categorical Exemption, Class 442 ❑ Declared Emergency(Sec. 15269(a)) ❑ Other Statutory Exemption, Section ❑ Emergency Project (Sec. 15269(b) or(c)) ❑ General Rule of Applicability[Section 15061 (b) (3)J For the following reason(s): The project consists of construction and location of limited small new structures, including street improvements of reasonable length to serve such construction,pursuant to section 15303 of CEQA. The project will not result in the removal of any scenic resource. Date: , ? By. Community Development Department Representative AFFIDAVIT OF FILING AND POSTING I declare that on - I received and posted this notice as required by California Public Resources Code Section 21152(c). Said notice will remain posted for 30 days from the filing date. Signature Title Applicant: Department of Fish and Game Fees Due Public Works Department ❑ EIR-$2,500 Total Due: $ 255 Glacier Drive ❑Neg.Dec. -$1,800 Total Paid $ Martinez, CA 94553 ❑ DeMinimis Findings-$0 Attn:Ngozi Aiawara ® County Clerk-$50 Receipt#: Environmental Section ® Community Development Dept.-$25 G:\EngSvc\ENVIRO\Flood Control\Pine Creek Detention Basin Desilt\CEQA\NOE.doc Updated July 21,2006 CALIFORNIA ENVIRONMENTAL QUALITY ACT Notice of Exemption Contra Costa County Community Development Department 651 Pine Street, 4th Floor-North Wing, McBrien Administration Building Martinez, CA 94553-0095 Telephone: (925) 313-2311 Contact Person: Ngozi Ajawara, Planner I, Public Works Dept. Project Title, Description, Common Name (if any) and Location: Project No. 7589-6D8492 CP#- Project Description: The purpose of this project is to collect soil from the basin site by DeSilva Gates Construction to use as a fill material on another site. This will assist the District by making progress towards excavating the ultimate basin configuration and provide the contractor with a local borrow site.The proposed work will include only removal of soil material from the basin. The bottom of the interim basin is currently at elevation 96 and the elevation will be held constant so that the basin will continue to drain through the existing primary spillway. Although no work will be conducted in or near the creek, a wildlife survey will be conducted to make sure environmental sensitive areas at the basin site will not be impacted. Project Location: The project is located near the intersection of Fairview and Sand Creek Road in the City of Brentwood. This project is exempt from CEQA as a: ❑ Ministerial Project(Sec. 15268) Categorical Exemption, Class 4g ❑ Declared Emergency,(Sec., 15269(a)) ❑ Other Statutory Exemption, Section ❑ Emergency Project(Sec. 15269(b)or(c)) ❑ General Rule of Applicability[Section 15061 (b) (3)J For the following reason(s): The project consists of construction and location of limited small new structures, including street improvements of reasonable length to serve such construction,pursuant to section 15303 of CEQA. The project will not result in the removal of any scenic resource. Date: By: Community Development Department Representative AFFIDAVIT OF FILING AND POSTING I declare that on I received and posted this notice as required by California Public Resources Code Section 21152(c). Said notice will remain posted for 30 days from the filing date. Si nature Title Applicant: ' Department of Fish and Game Fees Due Public,Works Department ❑ EIR-$2,500 Total Due: $. 255 Glacier Drive ❑Neg.Dec. -$1,800 Total Paid $ Martinez;CA 94553 ❑DeMinimis Findings-$0 Attn:Ngozi Aiawara ® County Clerk-$50 Receipt#: Environmental Section ® Community Development Dept.-$25 G:\EngSvc\ENVIRO\Flood Control\Pine Creek Detention Basin Desilt\CEQA\NOE.doc Updated July 21,2006 r d P 4 e . a a .r g 3 l a t) G Ul J cad � 4_ Ai— W y 66 O N u. r I' �o "W � �0. W � M� O M 0.1 N Mtn o • t' � d �`i i Z u, 1 a a c�tl W W ca 0_ S c �: � .7 *,`Y'�y•n�r`ry�"r.".� ""�4"°'"„ f f,,,.r, to �y}+.r '•t -f [.r �[,�� 1i`�{�"k.,a� :'y art � �} $ � } � .,,y �gy�f v+��: 't uj � 'a' ♦ V WO a 'fyv ' �3�, 1•. a'a. ` y �'x�79t i.�• 'L°a�' y!'i•. as'� elln��+,� rr4 ? ?' 6 tij Y 'i t,{`', M LL P-912'kM� rt InY'1'[�k' 't:..,. 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