FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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PLANT WATER PIPING REPLACEMENT AT SECONDARY CLARIFIERS 1-26 AT PLANT NO. 1, PROJECT NO. FE20-05
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Plant Water Piping Replacement at Secondary Clarifiers 1-26 at Plant No. 1, Project No. FE20-05;
B. Award a Construction Contract Agreement to T.E. Roberts, Inc. for Plant Water Piping Replacement at Secondary Clarifiers 1-26 at Plant No. 1, Project No. FE20-05, for a total amount not to exceed $1,375,313; and
C. Approve a contingency of $137,531 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) uses three different types of water in its operations: city water (potable water), reclaimed water (from OCWD), and OC San's secondary effluent (plant water). Plant water is the least expensive and is recycled within the plant after use. However, because it is the least treated, it is also the most corrosive of the three types of water.
Plant water is used in the treatment plants, particularly in secondary treatment areas for scum sprayers and wash-down purposes. Project No. FE20-05 involves replacing some of the piping in the Activated Sludge Facility No. 1 at Plant No. 1. Ensuring a consistent water supply is crucial for the smooth operation of the secondary treatment system.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* 24/7/365 treatment plant reliability
PROBLEM
OC San's Activated Sludge Facility No. 1 at Plant No. 1 has been in service since the 1970s. The metal plant water pipes have been subject to corrosion and leakage. These failures are mainly due to the more corrosive chemical composition of the plant water causing portions of the 1,600 feet of buried 6-inch ductile...
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