FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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TRICKING FILTER MEDIA REPLACEMENT AT PLANT NO. 1, PROJECT NO. P1-142
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Trickling Filter Media Replacement at Plant No. 1, Project No. P1-142;
B. Award a Construction Contract Agreement to GSE Construction Company, Inc. for Trickling Filter Media Replacement at Plant No. 1, Project No. P1-142, for a total amount not to exceed $21,565,292; and
C. Approve a contingency of $2,156,529 (10%).
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BACKGROUND
Trickling Filter Nos. 1 and 2 at Plant No. 1 are part of Orange County Sanitation District's (OC San's) secondary treatment processes. This stage of the treatment uses naturally occurring microorganisms to break down and remove most of the organic material remaining in the wastewater after solids have been removed in primary treatment. These two filters were originally built in 2006 by Project No. P1-76, Trickling Filter Rehabilitation and New Clarifiers Plant No. 1.
Each trickling filter is a large circular structure that stands 30 feet tall and measures 166 feet in diameter. Inside, they contain over 800,000 cubic feet of specially designed plastic media. The media creates a large surface area that supports the growth of beneficial microorganisms. As wastewater flows over a 20-foot-tall bed of this honeycombed media, these microorganisms grow on the surface and feed on the organic pollutants, helping to clean the water. On average, each of the trickling filters treat about 10 million gallons of wastewater per day, with the ability to handle approximately 30 million gallons a day during peak wet weather conditions.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* Ensure the public's money i...
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