FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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HEADWORKS MODIFICATIONS AT PLANT NO. 2 FOR GWRS FINAL EXPANSION, PROJECT NO. P2-122
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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 Headworks Modifications at Plant No. 2 for GWRS Final Expansion, Project No. P2-122;
B. Award a Construction Contract to Shimmick Construction Co., Inc. for Headworks Modifications at Plant No. 2 for GWRS Final Expansion, Project No. P2-122, for a total amount not to exceed $14,487,735; and
C. Approve a contingency of $1,448,773 (10%).
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BACKGROUND
Sewage from four trunk lines is blended in the Orange County Sanitation District's (Sanitation District) Plant No. 2 Headworks. One of the trunk lines is non-reclaimable because it includes flows from the Santa Ana River Interceptor and non-reclaimable side streams generated at Plant No. 1 and the Orange County Water District (OCWD). Several Plant No. 2 side streams are also non-reclaimable.
This project is necessary for the final expansion of the Groundwater Replenishment System (GWRS) and will be reimbursed by OCWD per an existing agreement dated March 2019.
RELEVANT STANDARDS
* Meet volume and water quality needs for the GWRS
* Use all practical and effective means for resource recovery
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsible bidder
PROBLEM
Reclaimable and non-reclaimable flows are currently combined in the Plant No. 2 Headworks, which makes all of Plant No. 2 effluent non-reclaimable. To recover reclaimable flows, the two streams must be separated.
PROPOSED SOLUTION
Award a Construction Contract for Headworks Modifications at Plant No. 2 for GWRS Final Expansion, Project No. P2-122. This contract will modify the Headworks by installing new gates and a diversi...
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