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 $1,097,600 (40%) 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 $2,195,200 (80%).
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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, an external inspection by divers, and development of a 3D model of the outfall using both internal and external mapping. The condition assessment work is complete.
RELEVANT STANDARDS
* Protect OC San assets
* 24/7/365 treatment plant reliability
PROBLEM
In May 2022, OC San began work to complete immediately required repairs that were discovered while completing the condition assessment on the 120-inch Ocean Outfall. These repairs included replacing the metal tie-rods connecting outfall pipe joints and sealing cracks in the concrete pipe and end gate. While performing the repair work, the dive team discovered that four of the twelve tie rods were stuck and could not be removed in order to be replaced. In addition, another tie rod became stuck during the replacement process and was not installed properly. The dive team was demobilized so the project team could determine a plan on how to replace the remaining stuck tie rods and these required repairs remain unfinished.
The work environment is extremely challenging. Divers are working at two-hundred-foot depths (which limits dive du...
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