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Bidjugde
JOB
Lake Mary Treatment Plant Sedimentation Basin Rehabilitation
BID DATE
12/28/20 - 3:00
AGENCY
Flagstaff
ESTIMATE
n/a
SCOPE
The City's water system consists of two surface water treatment plants with the Lake Mary Water Treatment Plant being the primary plant providing up to 8 MGD million gallons per day of water resources. An evaluation was conducted in 2015 to assess conditions of the facilities to estimate their useful remaining life. Facilities were prioritized for conditions which needed immediate attention. The top priority improvement project identified was the rehabilitation of the Lake Mary Water Treatment Plant sedimentation basins. Severe deterioration, spalling and exposed aggregate along vertical concrete walls requires attention. Sludge collector rake mechanism, drive, bridge, and center well assemblies are deteriorated and at the end of their useful lives. Significant corrosion on all drives, exposed metal components, weirs and channels, no provision for draining the clarifiers needs to be addressed. The Lake Mary Water Treatment Plant sedimentation basin improvement project will rehabilitate and resurface existing sedimentation basins. There are 4 basins that measure 70ft x 70ft x 12 ft each. The rehabilitation project will replace existing clarifier drive and collector units in each of the settling basins for process sludge removal. Deteriorated concrete structures and piers need to be rebuilt and resurfaced. The sludge collection mechanisms, drive, center well, and bridge needs to be replaced. The project will also provide a new drain pump and wet well for the drain pump. Additionally, a “static mixer” will be installed for efficient chemical mixing prior to the flocculation stage of the treatment process. Supervisory Control and Data Acquisition improvements will be included the rehabilitation project to provide efficient monitoring of all flocculation and sedimentation processes. pbrown@flagstaffaz.gov
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