To: The Contra Costa County Flood Control and Water Conservation District Board of Supervisors
From: Warren Lai, Public Works Director/Chief Engineer
Report Title: Approve Amended Agreement with the Central Contra Costa Sanitary District for the Grayson and Walnut Creeks Levee Improvement Project. Project No. 7520-6B8348
?Recommendation of the County Administrator ? Recommendation of Board Committee
RECOMMENDATIONS:
APPROVE and AUTHORIZE the Chief Engineer, Contra Costa County Flood Control and Water Conservation District (FC District), or designee, to execute an amended agreement (Agreement) with the Central Contra Costa Sanitary District (CCCSD) for implementation of the Grayson and Walnut Creeks Levee Improvement Project (Project), Martinez area.
FISCAL IMPACT:
The total estimated cost of the Project is approximately $14 million. This includes costs for preparing design and construction documents, obtaining permits, preparing California Environmental Quality Act (CEQA) documents, construction contracting, and related project management and administration. The terms of the Agreement provide for mutual cost sharing with the CCCSD. The FC District's share will be funded through Flood Control Zone 3B funds.
BACKGROUND:
The FC District and CCCSD are jointly implementing the Project along Walnut Creek and Grayson Creek to protect the CCCSD treatment plant from riverine flooding. An agreement for the Project was approved by the Board on December 8, 2020. Since that time, several changes to the project scope and budget have occurred, requiring revisions to the original agreement. The attached amended Agreement is proposed to accommodate the updated project and outlines the work efforts and total expenditures (past and anticipated) for the mutual cost-sharing arrangement.
The Project is designed to reduce flood risk to CCCSD's wastewater treatment plant in Martinez. The CCCSD and the FC District previously collaborated in 2007 to implement the Walnut Creek Interim ...
Click here for full text