FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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A-SIDE PRIMARY CLARIFIERS REPLACEMENT AT PLANT NO. 2, CONTRACT NO. P2-98A
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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 $4,456,235 (4%) to the existing Construction Contract with PCL Construction, Inc., for A-Side Primary Clarifiers Replacement at Plant No. 2, Contract No. P2-98A as part of Primary Treatment Rehabilitation at Plant No. 2, Project No. P2-98, for a new total contingency amount of $11,140,588 (10%).
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BACKGROUND
Orange County Sanitation District's (OC San) primary treatment process removes most of the solids from screened wastewater and is an essential part of the wastewater treatment process. This treatment is performed in large concrete structures called primary clarifiers.
The primary treatment facilities at OC San's Plant No. 2 consist of fourteen 140-foot-diameter circular clarifiers built between 1960 and 1985, along with associated piping, distribution structures, sludge pumping, odor control, and power distribution systems. The clarifiers are divided into three groups: the A-Side, consisting of four clarifiers; and the B-Side and C-Side, consisting of five clarifiers each. The A-Side primary clarifiers were constructed between 1960 and 1963 and require complete replacement. The new A-Side primary clarifiers are being constructed in an area adjacent to the existing units in an older area of the Plant with poorly documented structures dating back to the 1950s.
OC San executed the A-Side Primary Clarifiers Replacement Project, Contract No. P2-98A to construct four new primary clarifiers, a new odor control and chemical facility, a new electrical distribution center, and ancillary utilities and facilities. Once the new facilities are completed, the project will also demolish the four existing A-Side primary clarifiers, a p...
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