FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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PRIMARY SEDIMENTATION BASIN G DOME POST REPAIR AT PLANT NO. 2
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GENERAL MANAGER'S RECOMMENDATION
recommendation
RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Services Contract to J.R. Filanc Construction Company, Inc. to provide Primary Sedimentation Basin G Dome Post Repair at Plant No. 2, Specification No. S-2023-1385BD, for a total amount not to exceed $248,600; and
B. Approve a contingency of $24,860 (10%).
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BACKGROUND
Primary Clarifiers, or Primary Sedimentation Basins, are used to reduce suspended solids to the secondary treatment process. Four Primary Sedimentation Basins (D, E, F & G) provide primary treatment for non-reclaimable flows at Plant No. 2, and segregates the reclaimable flow provided to the Ground Water Replenishment System (GWRS). These circular Primary Sedimentation Basins had aluminum geodesic dome installed in the 1980's to prevent foul odor from escaping. Currently, Primary Sedimentation Basin G is unavailable due to unsafe conditions from heavily corroded dome supports. The project will replace the corroded aluminum dome support posts and structural elements, and repair the baffle in Primary Sedimentation Basin G.
RELEVANT STANDARDS
* Meet volume and water quality needs for the GWRS
* Maintain a proactive asset management program
* Comply with environmental permit requirements
PROBLEM
A recent condition assessment of the Primary Sedimentation Basins found severe corrosion in multiple areas to the aluminum posts that support the dome for Primary Sedimentation Basin G.
PROPOSED SOLUTION
Approve a Services Contract to J.R. Filanc Construction Company, Inc. for repair and replacement of aluminum dome support posts, collapsed baffle, and supporting dome components.
TIMING CONCERNS
On December 5, 2022, Plant No. 2 began operating in split mode, segregat...
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