FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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TRUCK LOADING BASEMENT DRAIN MODIFICATIONS AT PLANT NO. 1, PROJECT NO. FE18-16
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Truck Loading Basement Drain Modifications at Plant No. 1, Project No. FE18-16;
B. Award a Construction Contract to Metha Mechanical Company, Inc. for Truck Loading Basement Drain Modifications at Plant No. 1, Project No. FE18-16, for an amount not to exceed $162,500; and
C. Approve a contingency of $16,250 (10%).
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BACKGROUND
Biosolids are dewatered solids produced as a byproduct of wastewater treatment. The Orange County Sanitation District (OC San) recently completed a project to add centrifuges to reduce the water content of biosolids, thereby saving offsite hauling costs. The dewatered biosolids are routed through an existing truck loading station. Any biosolids that are deposited on the floor during maintenance of the truck loading station are returned to the treatment system through floor drains.
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
Performing maintenance on the truck loading facility results in biosolids falling on the floor. The existing drains were not designed for the thicker biosolids produced by the centrifuges. In addition, the new transfer pumps installed with the centrifuges are larger than the original pumps, so the pump bases have unavoidably blocked some of the drains. As a result, removing the resulting material can often take longer than the actual maintenance activity.
PROPOSED SOLUTION
Award a Construction Contract for Truck Loading Basement Drain Modifications at Plant No, 1, Project No. FE18-16. This project e...
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