Stormwater Retention Basin & Pump Station and Existing Stormwater Basin Rehabilitation Project
In June 2006, Pima County Wastewater Management Department (PCWWMD) awarded Quest the Stormwater Retention Basin & Pump Station and Existing Stormwater Basin Rehabilitation Project at the Roger Road Wastewater Treatment Plant (RRWWTP) located in Tucson, Arizona. Completed in two phases, this Project is part of an ongoing effort to maintain ADEQ compliance at the 41 MGD facility that has been in operation for more than fifty years. The first phase included construction of a new reinforced concrete stormwater retention basin, pump station and return flow pipeline. The second phase involved the rehabilitation of the existing stormwater retention basin.
The primary function of the new stormwater retention basin was to construct a new 1,200 cubic yard reinforced concrete structure capable of containing and storing approximately 1,800,000 gallons of stormwater with a secondary purpose of handling emergency wastewater overflows. Major features of the new basin included extensive excavation and earthwork, demolition of existing concrete structures and piping, installation of 36” reinforced concrete storm drain inlet piping, installation of approximately 2,200 lineal feet of 6” return flow force main piping throughout the plant site, service water piping, a complete new pump station, area lighting, fencing, painting and access road construction.
Upon completion of the new stormwater basin and pump station, the existing stormwater basin was rehabilitated to provide compliance with ADEQ requirements. Originally designed as reinforced concrete structure similar to the new stormwater basin, Quest proposed a Value Engineering Proposal to install a 40 mil HDPE liner system over the existing basin shotcrete lining system. The Value Engineering Proposal eliminated the need to demolish the existing structure and construct a new reinforced concrete stormwater basin structure, resulting in significant cost and schedule savings while maintaining a viable backup source of stormwater and wastewater overflow storage.
In addition to the Value Engineering Proposal for the existing basin rehabilitation, Quest provided Value Engineering Proposals for alternative handrail and access road features that provided additional cost savings to PCWWMD. The total of all Value Engineering Proposals reduced the original contract amount of $2,658,000 by $635,000 to a final contract amount of $2,023,000.
Completed in May 2007, Quest provided and maintained permit compliance, plant site security, erosion control, SWPPP compliance and ongoing facility coordination throughout construction.
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