Agenda

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C. 9

To:	Board of Supervisors
From:	Brian M. Balbas, Public Works Director/Chief Engineer
Date:	May 17, 2022

Contra

Costa

County

Subject:

APPROVE the Walnut & Grayson Creeks Desilting Project and take related actions under CEQA, Concord, Pacheco, Pleasant Hill, and Vine Hill areas.

APPROVE	OTHER
RECOMMENDATION OF CNTY ADMINISTRATOR	RECOMMENDATION OF BOARD COMMITTEE

Action of Board On: 05/17/2022

APPROVED AS RECOMMENDED

OTHER

Clerks Notes:

VOTE OF SUPERVISORS

AYE:

John Gioia, District I Supervisor
Candace Andersen, District II Supervisor
Diane Burgis, District III Supervisor
Karen Mitchoff, District IV Supervisor
Federal D. Glover, District V Supervisor

Contact:

Alex Nattkemper, 925.313.2364

I hereby certify that this is a true and correct copy of an action taken and entered on the minutes of the Board of Supervisors on the date shown.
ATTESTED: May 17, 2022
Monica Nino, County Administrator

BY:	, Deputy

RECOMMENDATION(S):

APPROVE the Walnut & Grayson Creeks Desilting Project (Project) and AUTHORIZE the Chief Engineer, or designee, to advertise the Project, Concord, Pacheco, Pleasant Hill, and Vine Hill areas. [Project No. WO#8334] DCD-CP#21-29 (Districts IV and V), and


FIND, on the basis of the whole record, including the proposed Initial Study/Mitigated Negative Declaration and any comments received and staff responses thereto, that there is no substantial evidence the Project may have significant effect on the environment, and that the Mitigated Negative Declaration reflects the independent judgment and analysis of the lead agency, Contra Costa County (County).

RECOMMENDATION(S): (CONT'D)

ADOPT the Mitigated Negative Declaration and Mitigation and Monitoring Reporting Program for the Project.

SPECIFY that the Contra Costa County Public Works Director is the custodian of the documents and other material that constitute the record of proceedings upon which the Board’s decision is based, and that the record of proceedings is located at 255 Glacier Drive, Martinez, CA.

DIRECT the Director of Conservation and Development, or designee, to file a Notice of Determination with the County Clerk, and,

AUTHORIZE the Chief Engineer, or designee, to arrange for payment of $2,548.00 for California Department of Fish and Wildlife fees, a $50 fee to the County Clerk for filing the Notice of Determination, and a $25 fee to Department of Conservation and Development for processing.

FISCAL IMPACT:

Estimated Project cost: $11,910,000. (100% Zone 3B Funds)

BACKGROUND:

The purpose of this Project is to remove sediment from Walnut and Grayson Creeks that has accumulated since the last desilt operation in 2006. This work is part of periodic maintenance of these channels as required by the U.S. Army Corps of Engineers. The proposed desilt locations are as follows: Grayson Creek from Chilpancingo Parkway to Imhoff Drive; and Walnut Creek from approximately 1,200 feet downstream of Diamond Boulevard to approximately 1,300 feet downstream of Concord Avenue. A total of about 172,300 cubic yards of sediment will be removed. Work is anticipated to occur from April to October for two consecutive years, starting in 2023.

CONSEQUENCE OF NEGATIVE ACTION:

Delay in approving the project may result in a delay of design, construction, and may jeopardize funding, in addition to an increased risk of flooding and property damage.