City_of_Napa_Public_Works_Department_Summary_Report_and_Cost_Estimate_Conn_Dam_Spillway_Modification_Study_Mar_1,_1968.pdf

This is a historical summary report and cost estimate prepared by the City of Napa Public Works Department dated March 1, 1968, related to a current Request for Qualifications issued by the City of Napa for comprehensive engineering consulting services on the Conn Dam Stability Assessment, Spillway Improvements, and Feasibility Alternatives Study. The City seeks qualified multidisciplinary engineering consulting firms specializing in dams to provide professional engineering, geotechnical, environmental, hydraulic, structural, dam safety, and economic evaluation services. The project is structured in three phases: Phase One requires a geotechnical data report to be submitted to the California Division of Safety of Dams (DSOD) by December 31, 2028; Phase Two involves assessment of the dam's stability including deformation estimates under static and seismic conditions; and Phase Three develops a feasibility alternatives analysis report addressing identified deficiencies including known spillway deficiencies. The City intends to utilize a Qualifications-Based Selection (QBS) process consistent with federal procurement requirements, including 2 CFR Part 200 and the Brooks Act principles.

The project anticipates federal funding as part of design and construction costs, with the City of Napa having been included by project name in the 2022 Water Resources Development Act (WRDA) and is pursuing federally authorized flood risk reduction studies through the U.S. Army Corps of Engineers (USACE). The selected consultant will provide technical support to ensure regulatory compliance with DSOD, advance federal flood risk reduction initiatives, evaluate long-term improvements for water supply reliability, and prepare the technical foundation for future environmental review, design, permitting, and construction activities.