To: Board of Supervisors
From: Warren Lai, Public Works Director/Chief Engineer
Report Title: APPROVE the San Pablo Dam Road - Storm Drain and Pavement Repair Project and take related actions under CEQA, Orinda area.
☒Recommendation of the County Administrator ☐ Recommendation of Board Committee
RECOMMENDATIONS:
APPROVE the San Pablo Dam Road - Storm Drain and Pavement Repair Project (Project) and AUTHORIZE the Public Works Director, or designee, to advertise the Project, Orinda area. [Project No. 0672-6U6265] DCD-CP# 23-19 (District 1), 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 (MND) reflects the independent judgment and analysis of the lead agency, Contra Costa County (County).
ADOPT the MND and Mitigation and Monitoring Reporting Program (MMRP) 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 (DCD), or designee, to file a Notice of Determination (NOD) with the County Clerk, and,
AUTHORIZE the Public Works Director, or designee, to arrange for payment of $3,043.75 for California Department of Fish and Wildlife fees, and a $50 fee to the County Clerk for filing the NOD.
FISCAL IMPACT:
Estimated Project cost: $7,700,000. 82% Federal Emergency Relief Program, 18% Local Road Funds.
BACKGROUND:
The purpose of the project is to replace the damaged storm drain system under San Pablo Dam Road located 1.2 miles west of Wildcat Canyon Road using trenchless pipe replacement methods, including pipe ramming and jack and bore. Two proposed 66-inch steel casing pipes will be rammed through two existing 72-inch corrugated metal pipes which will be used to guide the casings upstream to downstream. An additional 48-inch culvert will be jacked and bored through the embankment to maintain existing hydrologic and hydraulic conditions. An existing 36-inch overflow pipe will be abandoned in place by capping and backfilling. Additionally, the project will repair the damaged roadway embankment by reconstructing the concrete headwall and flume, grouting of the compromised soil beneath the roadway, and roadway rehabilitation.
CONSEQUENCE OF NEGATIVE ACTION:
Delay in approving the project may result in a delay of design, construction, and may jeopardize funding.