FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PLANT NO. 2 PRIMARY DISTRIBUTION STRUCTURE B GATES REPAIR
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Service Contract to J.R. Filanc Construction Co. to repair ten slide gates for Plant No. 2 Primary Distribution Structure, per Specification No. S-2021-1249BD, for a total amount not to exceed $309,500, including sales tax and freight; and
B. Approve a contingency of $46,425 (15%).
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BACKGROUND
The Orange County Sanitation District (OC San) has three primary Distribution Structures at Plant No. 2 that direct primary influent from Headworks to groupings of Primary Sedimentation Basins. Distribution Structure B (DS-B) directs primary influent to primary clarifiers H, I, J, K, L, and M. A condition assessment conducted on DS-B while the six associated primary clarifiers were down during a construction outage identified 10 slide gates that are inoperable and other steel components inside DS-B that are corroded.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
* Maintain a proactive asset management program
* Comply with environmental permit requirements
PROBLEM
Major corrosion issues were discovered during the condition assessment performed inside DS-B at Plant No. 2. 10 slide gates were inoperable and severe corrosion was found on numerous steel weir plates and a steel bulkhead. Replacement of these components is required to return DS-B to service.
PROPOSED SOLUTION
Staff recommends replacement of the corroded steel components identified in DS-B at Plant No. 2 through approval of a Purchase Order to the lowest responsive and responsible bidder, J. R. Filanc Construction Co.
TIMING CONCERNS
The proposed repair needs to be executed to restore DS-B and its associated six primary clarifiers to service to restore the rated primary clarification capacity at Plant No. 2. ...
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