FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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OCEAN OUTFALL CONDITION ASSESSMENT AND SCOPING STUDY, PROJECT NO. PS18-09
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
Approve a contingency increase of $823,200 (30%) to the Professional Services Agreement with Carollo Engineers, Inc. for Ocean Outfall Condition Assessment and Scoping Study, Project No. PS18-09, for a total contingency of $1,097,600 (40%).
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BACKGROUND
The Ocean Outfall Condition Assessment and Scoping Study is completing a condition assessment of the 120-inch outfall that discharges effluent from the Orange County Sanitation District (OC San) Plant No. 2, approximately five miles off the coast of Huntington Beach. The condition assessment included an internal inspection and external inspection by divers, and development of a 3D model of the outfall using both internal and external mapping. The internal inspection and mapping are complete, and the external inspection and mapping are partially complete with the outstanding work being the removal and replacement of one manhole cover on the outfall to determine the condition of the material, and the 3D mapping.
RELEVANT STANDARDS
* Protect OC San assets
* 24/7/365 treatment plant reliability
PROBLEM
On the morning of October 4, 2021, OC San was scheduled to begin work to determine the condition of the existing manhole covers on the outfall. This work involved sending a specialized dive team to the ocean floor to remove and replace the last manhole cover on the outfall pipe, so the existing manhole cover could be brought to the surface for testing. This work was planned months in advance but had to be called off due to the oil spill. The project incurred mobilization and demobilization costs due to having to cancel the work.
In addition, the condition assessment has revealed that there are several ele...
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