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Project Administration Bureau
525 Golden Gate Avenue, 8th Floor
San Francisco, CA 94102
T 415.554.4306
F 415.554.3225
TTY 415.554.3488
TO: Commissioner Newsha Ajami, President
Commissioner Sophie Maxwell, Vice President
Commissioner Tim Paulson
Commissioner Tony Rivera
Commissioner Kate Stacy
THRU: Dennis J. Herrera, General Manager
FROM: Ivy Fine, Deputy Assistant General Manager,
Project Administration Bureau, Infrastructure Division
Stephen Robinson, Assistant General Manager, Infrastructure Division
DATE: January 12, 2023
SUBJECT: Contract Advertisement Report: January 24, 2023
CONSTRUCTION:
Contract Number and Title:
DB-135 O'Shaughnessy Dam New Bulkhead
System
Estimated Cost:
$ 10,000,000
Program:
Hetchy Capital Improvement Program
Estimated Date of Advertisement:
January 2023
Description of Contract Work:
The O’Shaughnessy Dam is a 344 feet high concrete dam, located 140 miles east of San Francisco and 60 miles east of Sonora in Yosemite National Park, Tuolumne County. The purpose of this project is to provide a bulkhead system to be installed in the upstream inlets to twelve existing gate and valve outlets. The proposed bulkheads will be located in Hetch Hetchy Reservoir between 160 feet and 300 feet deep. The contract work will be performed using the Progressive-Design-Build (PDB) method. The scope of work includes design of bulkheads for each of the twelve outlets; development and preparation of the installation procedure; pre- construction planning; preparation of project cost; fabrication and delivery of the bulkhead; and installation of the bulkheads. Installation of the bulkhead will include underwater construction by divers to remove and clean rust and tubercles, and repair of upstream sealing surface at each inlet and initial test installation and removal of the bulkhead systems.
Project Manager:
Jimmy Leong
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