FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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BUSHARD DIVERSION STRUCTURE REPAIR, PROJECT NO. MP-307
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Receive and file Bid Tabulation and Recommendation for Bushard Diversion Structure Repair, Project No. MP-307;
B. Award a Construction Contract to Abhe & Svoboda, Inc. for Bushard Diversion Structure Repair, Project No. MP-307 for an amount not to exceed $1,762,545; and
C. Approve a contingency of $176,255 (10%).
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BACKGROUND
The Bushard Diversion Structure is a below-grade concrete structure in Bushard Street just north of the intersection with Ellis Avenue in the City of Fountain Valley. The structure is used to divert wastewater into Orange County Sanitation District's (OC San) Plant No. 1 that would otherwise flow to Plant No. 2 to make more flow available for recycling through the Groundwater Replenishment System. Staff can also use the structure to adjust the flow split between the two plants to facilitate planned maintenance. The structure includes two gates with modulating actuators to control how much flow is diverted to Plant No. 1. Due to the highly corrosive and potentially explosive gases in the structure, the motor actuators are self-contained and explosion proof.
RELEVANT STANDARDS
* Maintain a proactive asset management program
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* Meet volume and water quality needs for the GWRS
PROBLEM
The corrosive atmosphere within the Bushard Diversion Structure has damaged conduits, wiring, and hydraulic hoses for the two large valve actuators. As a result, one of the two valves is inoperable, and the other can only be operated manually. Manual operation involves setting up traffic control, shutting down traffic ...
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