FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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VFD REPLACEMENTS AT SEAL BEACH PUMP STATION, PROJECT NO. FE19-13
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for VFD Replacements at Seal Beach Pump Station, Project No. FE19-13;
B. Award a Construction Contract to Energy Management Corporation for VFD Replacements at Seal Beach Pump Station, Project No. FE19-13, for an amount not to exceed $138,650; and
C. Approve a contingency of $27,730 (20%).
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BACKGROUND
The Orange County Sanitation District (OC San) owns and operates the Seal Beach Pump Station which was built in 1972 and is near the end of its useful life. The pump station replacement is currently in design with completion scheduled for 2026.
The pump station consists of eight 100- to 200-horsepower pumps. The output of the four 200-horsepower pumps can be varied using variable frequency drives (VFDs).
RELEVANT STANDARDS
* Achieve less than 2.1 sewer spills per 100 miles
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
PROBLEM
Two of the existing 200-horsepower pumps have VFDs that were installed in 1991 are at the end of their useful service life. Replacement parts and manufacturer support services are no longer available. These VFDs are critical for the operational capacity of the pump station and their replacement cannot wait for completion of Seal Beach Pump Station Replacement, Project No. 3-67.
PROPOSED SOLUTION
Award the construction contract for VFD Replacements at Seal Beach Pump Station, Project No. FE19-13, to replace two existing 200-horsepower VFDs to maintain operation and reliability until completion of the new pump station.
A higher-than-usual contingency is requested because if unforeseen problems arise during replacement of...
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