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HomeMy WebLinkAboutMINUTES - 07242001 - C.11 N n TO: 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: July 24, 2001 SUBJECT: APPROVE the Wildcat Creek Basin 2001 Silt Removal project and DETERMINE that the project is a California Environmental Quality Act(CEQA) Class 4g Categorical Exemption,Richmond area. CDD-CP #01-39, Project No. 7527-6D9704-01 Specific Request(s) or Recommendation(s) & Background & Justification I. RECOMMENDED ACTION: APPROVE the Wildcat Creek Basin 2001 Silt Removal project, and DETERMINE that the 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. Continued on Attachment: X SIGNATUR RECOMMENDATION OF COUNTY ADMINISTRATOR _RECOMMENDATION OF BOARD COMMITTEE —APPROVE —OTHER SIGNATURE(S): ACTION OF BOARD ON JULY 24 , 2001 APPROVED AS RECOMMENDED xx OTHER VOTE OF SUPERVISORS UNANIMOUS(ABSENT IV ) 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 LC:sd Supervisors on the date shown. G:\GrpData\SpDist\Board Orders\Environmen tal\Wildcat Creek Basin 2001 Silt Removal(07-24-0l).doc JULY 24 2001 Orig.Div: Public Works(Engineering Services Division) ATTESTED: Contact: Leigh Chavez (925) 13-2366 cc: Administrator-Attn: E. Kuevor JOHN SWEETEN Clerk of the Board of Supervisors and Auditor-Controller County Administrator Community Development—K. Piona Public Works: Accounting Maintenance-T.Jensen. Engineering Services -L. Chavez By , Deputy SUBJECT: APPROVE the Wildcat Creek Basin 2001 Silt Removal project,and DETERMINE that the project is a California Environmental Quality Act(CEQA)Class 4g Categorical Exemption,Richmond area. CDD-CP 401-39, Project No. 7527-6D9704-01 DATE: July 24, 2001 PAGE: 2 RECOMMENDED ACTION (continued): 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. II. FINANCIAL IMPACT: The estimated project cost is $100,000, funded by Flood Control Zone 7 (100%). III. REASONS FOR RECOMMENDATION/BACKGROUND: The purpose of the project is to remove the accumulated sediment from the Wildcat Creek Sedimentation Basin. The project consists of the removal of approximately 13,200 cubic yards of silt from the basin. The Wildcat Creek Basin was designed and constructed by the U.S. Army Corps of Engineers (USACE) specifically for the purpose of sediment collection and removal. Based on the amount of accumulated sediment,desilting of the basin is necessary since additional sediment will not be trapped,potentially leading to large quantities of sediment passing through the basin and being deposited on the downstream floodplain and Wildcat Creek Marsh this winter. In addition, the accumulated sediment is reducing the hydraulic capacity of Wildcat Creek at this location, and is threatening to cause flooding at a nearby school, homes, and local industries. The project has been determined to be in compliance with the General Plan and is exempt from CEQA. The project will consist of a minor alteration in the condition of land, water, and vegetation which does not involve the removal of any mature scenic trees. The project will not result in the removal of any scenic resource. IV. CONSEQUENCES OF NEGATIVE ACTION: Delay in approving the project will result in a delay construction and may jeopardize funding. OyTRA PUBLIC WORKS DEPARTMENT COSTA INITIAL STUDY COUNTY OF ENVIRONMENTAL SIGNIFICANCE PROJECT #7527-6139704-01 CP# 01-39 PROJECT NAME: Wildcat Creek Basin 2001 Silt Removal S PREPARED BY: Leigh Chavez DATE: 6/27/01 APPROVED BY: �� `�� DATE: 7/r0�O RECOMMENDATIONS: (X) Categorical Exemption (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 consists of desilting Wildcat Creek Sedimentation Basin in order to limit downstream sediment deposition and restore flood protection capabilities. Excavated material from the basin will be disposed of at an upland location. The project will consist of minor alteration in the condition of land, water, and vegetation which does not involve the removal of any mature scenic trees. What changes to the project would mitigate the identified impacts N/A USGS Quad Sheet Richmond Base Map Sheet# J-4 Parcel # N/A GENERAL CONSIDERATIONS: 1. Location: The project is located upstream of Giaramita Street in the west county area of Richmond (Figures 1-3). 2. Project Description: The project consists"of the removal of approximately 13,200 cubic yards of silt from the Wildcat Creek Sedimentation Basin. The Wildcat Creek Basin was designed and constructed by the U.S. Army Corps of Engineers (USACE). specifically for the purpose of sediment collection and removal. Based on the amount of accumulated sediment,desilting of the basin is necessary since additional sediment will not be trapped, potentially leading to large quantities of sediment passing through the basin and beingdeposited on the downstream floodplain and Wildcat Creek Marsh this winter. In addition,the accumulated sediment is reducing the hydraulic capacity of Wildcat Creek at this location, and is threatening to cause flooding at a nearby school, homes, and local industries. In order to minimize impacts to surrounding environmentally sensitive areas,the project has been designed including several Best Management Practices (BMPs). These BMPs consist of fencing off several adjacent areas including the mature riparian corridor that defines the southern border of the project,the channel downstream of the basin weir that defines the western boundary of the project, and the riparian area north of the basin (with the exception of the established access _ ramps). Additional BMPs include installation of a straw bale sediment trap downstream of the worksite to ensure that no sediment is transported downstream as a result of the project, daily trash removal from the construction site to ensure the area is maintained in a clean condition,and fueling and maintenance of equipment at designated areas outside of the basin area. In order to minimize impact to adjacent riparian vegetation, access to the basin will be accomplished via the two existing access ramps and an additional temporary ramp from the eastern gate. Based on the requirements of the USACE Operations and Maintenance Manual prepared for the project,the basin has been desilted frequently(most recently in 1998)to maintain the design capacity. Therefore, a mature wetland/riparian system has not developed within the basin itself. Vegetation to be removed within the basin as a result of the desilt consists of immature riparian and wetland vegetation dominated by cattails and willow seedlings. The sediment removed from the channel will be disposed of either by off-haul to an acceptable upland disposal site chosen by the contractor or on the existing stockpile at the District property north of the basin. Following completion of the desilt, all disturbed slopes will be seeded with a mix including native grasses prior to winter rains. There is a known population of rainbow trout in Wildcat Creek; however, the population does not exhibit anadromous behavior (i.e., the population out-migrates but does not return to Wildcat Creek) and, therefore, cannot be classified as the listed species of steelhead (pers. comm. P. Alexander, East Bay Regional Parks District Fisheries Biologist, 6/18/01). In addition, according to Mr. Alexander, no other listed anadromous fish species occur within Wildcat Creek. 3. Does it appear that any feature of the project will generate significant public concern? [ ] yes [X] no [ ] maybe (Nature of concern): 4. Will the project require approval or permits by other than a County agency? [X] yes 0 no Agency Name(s) California Department of Fish and Game, Regional Water Quality Control Board, US Army Corps of Engineers 5. Is the project within the Sphere of Influence of any city? Yes, the City of Richmond GAengserv\enviro\2001 projects\W ildcatBasin\CEQAIS ._;`g; �``-"�r�:j�► tib`` �Pi:: • IMt i t �®®RR � �.. V• F^.r.a.i^<t.� D. \ i•�,t?t�• "��'����' �7 :� � �`iY�`�' x'13.. t. 4 80 2-9 ME M it W "OONt, •• � � `✓\..'\® .•,\,\fir t/��'�.r ei �'" ®�'�•�E,za \\\ �� ©r. �.► Ulm l ��. ►: ` Via" '�,'�! N wills EMU UMS TTY 'MIX AllI., 4 j "'�.�17:1; •e•'-.�: rpeoME�l tt '• �'® oil ::� 1 , •�:, r; Sr: 1 a"0-q�: W All. ww 01. *!P ' z i■�e; �>r ;fir. �r �� ril9i+ L�:csLiilE��:��LUL©��PL711oLLi , LLU tr3�i L.L0 �'r�•�ac�l.;: ���uci� :i;yy: IIL`.+•1— fitall) it etrt r im Mai LJ !�i► L� { ! Lam' �11i� a,��.ii -�� m- r'" .,,.'. 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O " 6t„ "x �o .",iY^io^—R sT. �s•so i 1710" T0«t 100 T[CT.pM s^A G r �� /� •x" � z p^o'^ �R g •� � o �9��R *Co..t� • o s[.v.ct won C. y SpB i xp o t _ r , 1 �A' N ca.ot en t..p sTo Rt 1401tc Tip _ T \\ it••CONI 1 py INt IS zj � aaa z ��, a'• tri isT• ,.po <. Q Y� &D-Y S m „ sr Y m -� o ex. F• \off 1b t.' F��II ••�y m y?`� o V t� jl tCD ~ n m c ` ,r= co co 3 h �a . N O � � p,, t '�1 ' non•- o' - ; 2fp _ x N Q t m s �+ m tD S{ ,�;`o © •0. f{!1`�3r ( J' .•" -t o. � ^4 "t2 .) � ; x x i '°•; �.- ^a ((�� L - R 0 � LAI to r f w 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:(510)313-2296 Contact Person: Leigh Chavez-Public Works Dept. Project Description,Common Name(if any)and Location:Wildcat Creek Basin 2001 Silt Removal,County File#CP 01- 39. Project Description:The project consists of the removal of approximately 13,200 cubic yards of silt from the Wildcat Creek Sedimentation Basin. The Wildcat Creek Basin was designed and constructed by the U.S.Army Corps of Engineers (USACE)specifically for the purpose of sediment collection and removal. Based on the amount of accumulated sediment, desilting of the basin is necessary since additional sediment will not be trapped,potentially leading to large quantities of sediment passing through the basin and being deposited on the downstream floodplain and Wildcat Creek Marsh this winter.In addition,the accumulated sediment is reducing the hydraulic capacity of Wildcat Creek at this location,and is threatening to cause flooding at a nearby school,homes,and local industries.In order to minimize impacts to surrounding environmentally sensitive areas,the project has been designed including several Best Management Practices(BMPs). These BMPs consist of fencing off several adjacent areas including the mature riparian corridor that defines the southern border of the project,the channel downstream of the basin weir that defines the western boundary of the project,and the riparian area north of the basin(with the exception of the established access ramps). Additional BMPs include installation of a straw bale sediment trap downstream of the worksite to ensure that no sediment is transported downstream as a result of the project,daily trash removal from the construction site to ensure the area is maintained in a clean condition,and fueling and maintenance of equipment at designated areas outside of the basin area. In order to minimize impact to adjacent riparian vegetation,access to the basin will be accomplished via the two existing access ramps and an additional temporary ramp from the eastern gate. Based on the requirements of the USACE Operations and Maintenance Manual prepared for the project,the basin has been desilted frequently(most recently in 1998)to maintain the design capacity. Therefore,a mature wetland/riparian system has not developed within the basin itself. Vegetation to be removed within the basin as a result of the desilt consists of immature riparian and wetland vegetation dominated by cattails and willow seedlings. The sediment removed from the channel will be disposed of either by off-haul to an acceptable upland disposal site chosen by the contractor or on the existing stockpile at the District.property north of the basin. Following completion of the desilt,all disturbed slopes will be seeded with a mix including native grasses prior to winter rains. There is a known population of rainbow trout in Wildcat Creek; however,the population does not exhibit anadromous behavior(i.e.,the population out-migrates but does not return to Wildcat Creek)and,therefore,cannot be classified as the listed species of steelhead(pers.comm.P.Alexander,East Bay Regional Parks District Fisheries Biologist,6/18/01). In addition,according to Mr.Alexander,no other listed anadromous fish species occur within Wildcat Creek. Project location:The project is located upstream of Giaramita Street in the west County area of Richmond. This project is exempt from CEQA as a: i Ministerial Project(Sec.15268) _ Other Statutory Exemption,Section Declared Emergency(Sec.15269(a)) _ General Rule of Applicability(Section 15061(b)(3) Emergency Project(Sec.15269(b)or(c)) X Categorical Exemption, Class 4q for the following reason(s): The project consists of desilting Wildcat Creek Sedimentation Basin in order to limit the downstream sediment deposition and restore flood protection capabilities. Excavated materials from the basin will be disposed of at an upland location. The project will consist of minor alteration in the condition of land,water,and vegetation which does not involve the removal of any mature scenic trees. 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: County Public Works Department 255 Glacier Drive Martinez,CA 94553 Attn: Leigh Chavez County Clerk Fee$50 Due G:\design\enviro\2001 Projects\WildcatBasin\NOE