FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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GISLER-RED HILL INTERCEPTOR REHABILITATION, PROJECT NO. 7-65
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Professional Design Services Agreement with CDM Smith to provide engineering services for Gisler-Red Hill Interceptor Rehabilitation, Project No. 7-65, for an amount not to exceed $1,754,000; and
B. Approve a contingency of $175,400 (10%).
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BACKGROUND
The Orange County Sanitation District (Sanitation District) owns and maintains regional conveyance facilities in the Cities of Costa Mesa and Irvine, including the 30 and 33-inch diameter Gisler-Red Hill Interceptor and the Baker Force Mains. The Gisler-Red Hill Interceptor runs approximately 15,000 feet from near Main Street Pump Station to College Avenue Pump Station near Harbor Blvd.; mostly just south of the 405 Freeway in the Cities of Costa Mesa and Irvine. The Baker Force Mains are two 42-inch diameter force mains running approximately 6,000 feet from Main Street Pump Station to Baker Street; mostly along Airway Avenue in the City of Costa Mesa. The facilities range in age from 30 to 55 years. The interceptor and force mains are not capacity deficient.
RELEVANT STANDARDS
* Achieve less than 2.1 sewer spills per 100 miles
* Protect Orange County Sanitation District assets
* California Government Code ?4526: Select the "best qualified firm" and "negotiate fair and equitable fees"
PROBLEM
Condition assessments completed in 2015 and 2017 on the Gisler-Red Hill Interceptor indicate corrosion in most of the manholes, as well as multiple cracks in the vitrified clay piping. The Baker Force Mains have corrosion and liner failures due to the corrosive gas migration from the wet wells.
PROPOSED SOLUTION
Award a Professional Design Services Agreement for Gisler-Red Hill Interceptor Rehabilitation, Project No. 7-65. The project w...
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