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C. 11

To:	Contra Costa County Flood Control District Board of Supervisors
From:	Brian M. Balbas, Public Works Director/Chief Engineer
Date:	May 9, 2023

Contra

Costa

County

Subject:

Contract with GEI Consultants, Inc., Brentwood area. Project No. 7521-6D8495

APPROVE	OTHER
RECOMMENDATION OF CNTY ADMINISTRATOR	RECOMMENDATION OF BOARD COMMITTEE

Action of Board On: 05/09/2023

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
Ken Carlson, District IV Supervisor
Federal D. Glover, District V Supervisor

Contact:	Gus Amirzehni, (925) 313-2128
cc:	Allison Knapp, Deputy Chief Engineer Tim Jensen, Flood Control Gus Amirzehni, Flood Control Michael Taylor, Flood Control Catherine Windham, Flood Control

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 9, 2023
Monica Nino, County Administrator

BY:	, Deputy

RECOMMENDATION(S):

Acting as the governing body of the Contra Costa County Flood Control and Water Conservation District (Flood Control District), APPROVE and AUTHORIZE the Chief Engineer, or designee, to execute a contract with GEI Consultants, Inc., in an amount not to exceed $929,843 to provide project management expertise in support of the Marsh Creek Reservoir Restoration and Total Mercury Reduction Project (Project) for the period of April 30, 2023 through April 30, 2026, Brentwood area.

FISCAL IMPACT:

This contract is funded by 41% Flood Control District Zone 1 Funds and 59% State Grant Funds (Proposition 1 Ecosystem Restoration and Water Quality Grant Program provided by Delta Conservancy).

BACKGROUND:

The Flood Control District owns and manages the Marsh Creek Reservoir. The Marsh Creek dam and reservoir located approximately four miles southwest of the City of Brentwood in Contra Costa County were constructed in 1962 with the single purpose to provide flood protection to the downstream communities of Brentwood and Oakley. Over the 60-year life of the reservoir, contaminated sediment accumulation has diminished reservoir capacity and degraded water quality. Water and sediment entering the reservoir are contaminated with mercury originating from an upstream abandoned mercury mine at the base of Mount Diablo. Due to current configuration of the reservoir and sedimentation, the reservoir wet pool becomes cut off from Marsh Creek and is subject to periodic dry down. As a result, the aquatic biota previously supported in the reservoir have perished. Additionally, cattle grazing along Marsh Creek has negatively impacted riparian habitat preventing natural recruitment and resulting in aging and deteriorating riparian trees.

The Project will restore reservoir capacity, restore and increase ecosystem functions and values, increase reservoir and habitat resilience to climate change, reduce mercury output to downstream Sacramento-San Joaquin Delta habitats, and improve aesthetic value and recreation opportunities in conjunction with existing planning efforts by East Bay Regional Park District and California State Parks.

On August 11, 2022, the Flood Control District issued a Request for Qualification (RFQ) for the design, permitting, and California Environmental Quality Act (CEQA) services for the Project. Through this competitive process, GEI Consultants, Inc., was determined to be the most qualified consultant team to provide the requested services. This contract will engage GEI Consultants, Inc., to provide the services needed to complete the design, permitting, and CEQA services for the Project. More specifically, this contract includes preparing CEQA documentation, regulatory permit applications, construction plans, specifications, and an engineer’s cost estimate for the Project.

CONSEQUENCE OF NEGATIVE ACTION:

Without the approval of this contract by the Board of Supervisors, the Flood Control District will not be able to obtain services to complete the Project. Additionally, the Flood Control District will not be able to benefit from the $550,000 in additional state and local grant funding awarded to them for this contract.