To: The Contra Costa County Flood Control and Water Conservation District Board of Supervisors
From: Warren Lai, Public Works Director/Chief Engineer
Report Title: Rescind Board Action from April 28, 2026, Pertaining to an Interagency Agreement with Aquatic Science Center; and Approve and Authorize Execution of the Revised Interagency Agreement.
?Recommendation of the County Administrator ? Recommendation of Board Committee
RECOMMENDATIONS:
RESCIND Board action of April 28, 2026 (C.141), which approved execution of an Interagency Agreement with Aquatic Science Center (Agency); and APPROVE and AUTHORIZE the Chief Engineer, Contra Costa County Flood Control and Water Conservation District (Flood Control District) or designee, to execute the revised Interagency Agreement with the Agency, in an amount not to exceed $1,000,000, to synthesize historical maps, reports, photographs, written accounts, field observations, and botanical records to characterize the ecological, hydrologic, and geomorphic conditions of the Walnut Creek Watershed prior to major Euro-American modification. Additionally, a fully illustrated report and GIS database to support a landscape change analysis comparing historical habitat extent and distribution to present-day conditions will be provided. This interagency agreement is from June 23, 2026 through June 22, 2031, and covers portions of Walnut Creek, Concord, Pleasant Hill, Martinez, Lafayette, Moraga, Danville, San Ramon, and unincorporated County areas.
FISCAL IMPACT:
The Project is 100% funded by the Flood Control District Zone 3B funds. Project No. 7520-6B8290
BACKGROUND:
On April 28, 2026, the Board of Supervisors approved an Interagency Agreement with the Agency in an amount not to exceed $1,000,000, for the period of April 28, 2026 through April 27, 2029, to conduct a historical ecology study of the Walnut Creek Watershed that will reconstruct pre-development ecological and hydrological conditions and produce a technical report an...
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