E. WATER

PROJECT TITLE: Cary/Apex Water Treatment Plant Supplemental Water Supply

RESPONSIBLE DEPARTMENT: Engineering

PROJECT FUNDING: $250,000

FIRST YEAR ESTIMATED OPERATING COSTS: None

PROJECT DESCRIPTION:
The Cary/Apex Water Treatment Plant Supplemental Water Supply project provides for further treatment of effluent flow from new residuals treatment facilities. The process supported by this project utilizes membranes and ultraviolet disinfection to convert effluent flow to a supplemental raw or finished water source. Total project cost is estimated to be $18,300,000. FY 2009 funding of $250,000 supports preliminary engineering and regulatory approvals. Additional funding needs of $750,000 in FY 2011 and $17,300,000 in FY 2012 will be necessary for detail design and construction. PROJECT JUSTIFICATION: A technical memorandum prepared by an outside engineering firm in November 2007 for the Town of Cary identified the benefits a supplemental water supply would likely have upon the Town’s water treatment system. Supplemental treatment is estimated to produce up to 70,000 gallons of raw or finished water per million gallons treated at the Cary/Apex Water Treatment Plant. At 40 million gallons per day (MGD) plant flow, this equates to 2.8 MGD of supplemental raw or finished water. The benefits of a supplemental water supply to the Town’s water treatment system are two-fold First, supplemental flow could be returned to the head of the water treatment plant where it would serve as a supplemental raw water source. Secondly, with sufficient treatment and regulatory approval, this flow could be sent directly to the clearwell as finished water.
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