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Bidjugde
JOB
(CMAR) Greenfield Water Reclamation Plant Phase III Expansion
BID DATE
01/20/15 - 3:00
AGENCY
Mesa
ESTIMATE
$120,000,000
SCOPE
PER MESA REP 1/7/15, NO INFO UNTIL END OF FEB: AWARD 12/2014: The City of Mesa, Town of Gilbert, and Town of Queen Creek seek to provide an additional 16 million gallons/day (MGD) liquids and solids treatment capacity at the existing Greenfield Water Reclamation Plant (GWRP), complete with the required infrastructure, technology, and environmental features to provide a reliable, efficient, expanded plant to meet the current and future demands of the City of Mesa, Town of Gilbert, and Town of Queen Creek. The existing plant was constructed in two phases. The first phase provided a lift station to transfer sewage to the City of Mesa’s Southeast Water Reclamation Plant or to the Baseline Interceptor for transfer to Phoenix 91st Avenue Plant and was completed in 1999. The second phase of the plant construction converted the lift station into the current treatment plant with the capacity to treat 16 MGD Liquids and 24 MGD Solids Equivalent. The treatment processes at the Greenfield Water Reclamation Plant consist of grit removal, primary clarifiers, activated sludge basins with aerobic and anoxic zones for Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), and nitrogen removal, secondary clarifiers, filtration, and ultra-violet (UV) disinfection. The sludge from the primary clarifiers and secondary clarifiers, along with the sludge from Southeast Water Reclamation Plant, is sent to two anaerobic digesters for treatment. Class B biosolids are produced from the anaerobic digestion and are sent to farmland as fertilizer. The digestion gas is used to fire the digesters’ boilers and the surplus is flared. While expanding the treatment capacities, this project will address the operational issues the plant is experiencing, which include replacement, repair, and rehabilitation of deteriorating equipment. This project will also consider alternative technologies for aeration, filtration, disinfection and co-generation for cost savings while considering adaptability of the existing systems. The goal is to optimize project delivery by maximizing cost and schedule savings while ensuring a quality project. This project will also include potential replacement of the existing filters and the UV disinfection system with new technology. In addition, co-generation (co-gen) system is planned to be added if the economics are favorable. Heather Sneddon of the Engineering Department at 480-644-3269, Fax 480- 644-3392, E-Mail: heather.sneddon@mesaaz.gov.

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