FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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ACTIVATED SLUDGE AERATION BASIN REHABILITATION AT PLANT NO. 2, PROJECT NO. P2-136
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Professional Design Services Agreement with Carollo Engineers, Inc. to provide engineering services for Activated Sludge Aeration Basin Rehabilitation at Plant No. 2, Project No. P2-136, for an amount not to exceed $5,891,599; and
B. Approve a contingency of $589,160 (10%).
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BACKGROUND
The Activated Sludge (AS) facility at Orange County Sanitation District (OC San) Plant No. 2 was built in 1977 to provide 75 million gallons per day (mgd) of secondary treatment capacity. The AS plant was expanded to 90 MGD in 1996, rehabilitated in 2008, and recently repaired with maintenance projects. The AS facility consists of aeration basins, a liquid oxygen facility, and secondary clarifiers.
RELEVANT STANDARDS
* Comply with California Government Code Section 4526 to engage the best qualified firm "on the basis of demonstrated competence and qualifications" and "negotiate fair and reasonable fees"
* Commitment to safety & reducing risk in all operations
* 24/7/365 treatment plant reliability
PROBLEM
The AS facility is located within the coastal zone and much of the outdoor mechanical equipment and instruments are deteriorated due to atmospheric corrosion caused by the marine environment. Components of the mechanical and electrical equipment on top of the aeration basin deck require replacement, including the aeration mixer systems and sluice gates. Appurtenant facilities, including the purge fan rooms and odor control systems, will also require the replacement of their respective mechanical components and instrumentation. The two carbon steel oxygen pipelines running from the liquid oxygen facility to the basins are also corroded and require replacement.
The concrete deck ...
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