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7.G. Purchase ofAmerican Sigma Gravity FlowMeteringEqulpment <br />-Al <br />pha Valve and Controls. Ina <br />The Board reviewed a Memorandum of September 23, 1999: <br />DATE: SEPTEMBER 23,1999 <br />TO: JAMES E. CHANDLER <br />COUNTY ADMINISTRATOR <br />FROM: DONALD % HUBBS,P.E. <br />DIRECTOR OF CES <br />PREPARED GENE A. RAUTH?, <br />AND STAFFED WATER & WASTEWATER OPERATIONS MANAGER �Ta <br />BY: <br />SUBJECT: PURCHASE OF GRAVITY FLOW METERING EQUIPMENT <br />BACKGROUND <br />At the present time, the Department of Utility Services has 3202 wastewater collection manholes <br />and 711,871 lineal feet of gravity wastewater collection lines. The Lift Station Operations Division <br />is charged with the responsibility for the operation and maintenance of these facilities. One of the <br />primary Division goals is to minimize the amount of groundwater and rainwater, (known as Inflow <br />and Infiltration — I & 1), entering the wastewater collection system. Once ground water and <br />rainwater enter the wastewater collection system, it must be treated as wastewater, increasing <br />pumping and plant treatment cost, and reducing available capacity. <br />To minimize the additional costs created by I & I, the Wastewater Collection Division must <br />accurately determine the source of the I & L One method for determining I & I sources, is through <br />the use of gravity flow meters. <br />CONCLUSION <br />As outlined in the attached documents, the Field Operations Group has tested several gravity flow <br />meters. Of those tested, the American Sigma Gravity Flow Meters are the only meters that <br />displayed an acceptable level of accuracy. <br />Based on the Department's actual field testing of several different gravity flow meters, the <br />Department requests the purchase of the American Sigma Gravity Flow Meters. (See attached <br />divisional recommendation). <br />October 5, 1999 <br />24 <br />10 0 <br />