FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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EPSA MOTOR COOLING IMPROVEMENTS AT PLANT NO. 2, PROJECT NO. FE19-06
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for EPSA Motor Cooling Improvements at Plant No. 2, Project No. FE19-06;
B. Award a Construction Contract to Mehta Mechanical Company Inc. dba MMC Inc. for EPSA Motor Cooling Improvements at Plant No. 2, Project No. FE19-06, for a total amount not to exceed $854,000; and
C. Approve a contingency of $85,400 (10%).
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BACKGROUND
Treated wastewater from Orange County Sanitation District (OC San) Plant Nos. 1 and 2 that cannot be reclaimed is pumped to the ocean through a five-mile-long outfall pipe. This pumping is accomplished by eight 120-million gallon per day pumps. The Ocean Outfall Booster Pump Station has five 2600-horsepower pumps, and the Effluent Pump Station Annex (EPSA) has three 3000-horsepower pumps. EPSA was completed in 2004 to supplement the capacity of the existing five outfall pumps.
Prior to widespread water conservation and reclamation through the Groundwater Replenishment System, outfall flows averaged around 240 million gallons per day. Now, discharges to the ocean average 88 million gallons per day, with minimum hourly flow rates dropping as low as 50 million gallons per day.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* Maintain a proactive asset management program
PROBLEM
At current low, night-time flow rates, an EPSA pump typically operates between 40% and 60% of full speed. The motor's air-cooling fans are driven by the motor shaft and provide insufficient air flow below 65% motor speed causing the motors to overheat. This limits the EPSA pumps availability to be rotated into service with the...
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