FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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BAY BRIDGE PUMP STATION FORCE MAIN ISOLATION VALVE REPLACEMENT, PROJECT NO. FRC-0013
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
Ratify approval of a contingency increase of $52,118 (18%) to the Emergency Repair Service Contract with Charles King Company for Bay Bridge Pump Station Force Main Isolation Valve Replacement, Project No. FRC-0013, for a total contingency of $196,911 (68%).
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BACKGROUND
The Orange County Sanitation District (OC San) owns and operates pump stations and a force main network along Pacific Coast Highway in Newport Beach. The Bay Bridge Pump Station, Rocky Point Pump Station, and the Lido Pump Station all pump into, and pressurize, this two-pipe force main system. Each pump station has an isolation valve to each force main pipe to allow separation of the internal pump station systems from the other pump stations. This is necessary to isolate suction and discharge headers and common flow elements to be maintained or repaired. These pump station force main isolation valves are also necessary to install temporary bypass pumping systems at the individual pump stations and to stop flow to either force main pipe if it were compromised in some way.
The Bay Bridge Pump Station was originally constructed in 1965 and is near the end of its useful life. Bay Bridge Pump Station Replacement, Project No. 5-67, is in design and is scheduled to replace the pump station by 2027.
The pump isolation valves at the Bay Bridge Pump Station were in urgent need of replacement. Replacement could not wait until the new pump station is completed. In November 2020, the Board awarded a contract for Bay Bridge Pump Station Valve Replacement, Project No. FRC-0002, to replace the valves within the pump station. The work requires bypass pumping which depends on the two force main isolation valves.
In the course of ...
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