FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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SECONDARY TREATMENT VFD REPLACEMENTS AT PLANT NO. 2 AND VFD REPLACEMENTS AT PLANT NO. 1, PROJECT NOS. FE19-08 AND FR1-0011
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Receive and file Bid Tabulation and Recommendation for Secondary Treatment VFD Replacements at Plant No. 2 and VFD Replacements at Plant No. 1, Project Nos. FE19-08 and FR1-0011;
B. Award a Construction Contract Agreement to Big Sky Electric, Inc. for Secondary Treatment VFD Replacements at Plant No. 2 and VFD Replacements at Plant No. 1, Project Nos. FE19-08 and FR1-0011, for an amount not to exceed $3,424,300; and
C. Approve a contingency of $342,430 (10%).
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BACKGROUND
Orange County Sanitation District (OC San) operates multiple pump stations and treatment facilities at Plant No. 1 and Plant No. 2 that are critical to wastewater treatment operations and regulatory compliance. These facilities use pumps equipped with variable frequency drives (VFDs) to control pump speed in response to changing flow and process conditions and to support reliable and efficient operations.
At Plant No. 1, the City Water Pump Station, Trickling Filter Pump Station, and Return Activated Sludge (RAS) Pump Station support key treatment and utility functions. The City Water Pump Station provides potable water to the Plant, the Trickling Filter Pump Station conveys primary effluent to the trickling filters for treatment, and the RAS Pump Station returns process flow to the front of the Activated Sludge Facility No. 1. These pump stations include a total of six VFDs: two at the City Water Pump Station, three at the Trickling Filter Pump Station, and one at the RAS Pump Station.
At Plant No. 2, the Activated Sludge Facility includes fourteen pumps ranging from 50 to 300 horsepower, equipped with VFDs to control...
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