FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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COLLECTION SYSTEM FLOW LEVEL MONITORING STUDY, PROJECT NO. PS20-02
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Professional Services Agreement with Woodard and Curran, Inc. to provide engineering services for the Collection System Flow Level Monitoring Study, Project No. PS20-02, for an amount not to exceed $616,562; and
B. Approve a contingency of $61,656 (10%).
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BACKGROUND
The Orange County Sanitation District's (OC San) sewer collection system hydraulic model was first developed in 2006 as part of the Strategic Plan Update. The goal was to identify potential capacity deficiencies within OC San's sewer collection system and establish future capital improvement projects to address these deficiencies. Subsequently, the Collections Capacity Evaluation Study was completed in 2019 to update the hydraulic model and identify new capital improvement projects.
RELEVANT STANDARDS
* Maintain and adhere to appropriate internal planning documents (Facilities Master Plan)
* Protect OC San assets
PROBLEM
The 2019 Collections Capacity Evaluation Study identified locations within OC San's sewer collection system that may have capacity deficiencies during a peak wet weather event. To address these deficiencies, the study identified the need for capital improvement projects in these areas to increase the capacity of OC San's sewer. Since the results are based on projections of flows generated by a hydraulic model, and the model relies on field data and engineering assumptions, the results could be overly conservative or not conservative enough based on the quality and quantity of field data.
PROPOSED SOLUTION
Install flow meters at strategic locations within OC San's sewer collection system to collect additional data during the entirety of a wet weather...
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