FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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SUNFLOWER AND RED HILL INTERCEPTOR REPAIRS, PROJECT NO. 7-66
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Sunflower and Red Hill Interceptor Repairs, Project No. 7-66;
B. Award a Construction Contract to Charles King Company for Sunflower and Red Hill Interceptor Repairs, Project No. 7-66, for an amount not to exceed $4,777,000; and
C. Approve a contingency of $477,700 (10%).
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BACKGROUND
Sunflower Interceptor Reach 3 and Red Hill Interceptor Reaches 4 and 5 consists of one gravity trunk sewer over approximately 6,000 linear feet located in city streets and easements within the Cities of Irvine and Costa Mesa and bordering the City of Santa Ana. The sewers were constructed in 1971, consist of reinforced concrete pipes varying in sizes from 27 inches to 84 inches, and run along Red Hill Avenue, Main Street, and Sunflower Avenue. To protect the concrete from corrosive sewer gas, a polyvinyl chloride (PVC) liner was installed in the upper 270 degrees of the pipe. The bottom 90 degrees was expected to be fully submerged and thus not subject to corrosion.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8 by awarding a construction contract to lowest responsive, responsible bidder
* Protect OC San assets
* Achieve less than 2.1 sewer spills per 100 miles
PROBLEM
In 2015, inspections related to the Orange County Sanitation District (OC San) Asset Management Program showed that PVC lining had failed at multiple locations. Lower than expected flows were also shown to have resulted in corrosion of the unlined concrete in the bottom 90 degrees of the pipe.
PROPOSED SOLUTION
Award a Construction Contract for the Sunflower and Red Hill Interceptor Repairs, Project No. 7-66. The work will repair PVC liner fai...
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