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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4. WATER TREATMENT <br /> <br />4.1 Water Treatment Facility <br /> <br />The water treatment plant is a small, concrete-block structure constructed in 1971 and <br />upgraded in 1982-1983, The plant takes raw water from a gravity '/2-mile long 12 inch- <br />diameter pipeline, The process train consists of metering, chemical addition, flocculation and <br />settling in an up-flow clarifier, multimedia filtration through two parallel filters and <br />disinfection in a clearwell, The clearwell serves two vertical turbine high service pumps <br />which pump to the transmission pipeline and a 1.0 million gallon tanle The tank also supplies <br />filter backwash water to the plant and sets the static head for the upper pressure zone of the <br />distribution system, Refer to the schematic in Figure 3 for a graphical presentation of the <br />treattnent train. <br /> <br />The plant is operated by a utility foreman and a senior operator (both Class A, water and <br />wastewater) serving on rotating shifts, Another operator is available as an assistant. The <br />plant operating time ranges from 4 to 15 hours per day, depending upon water demand, The <br />objective of each shift is to fill the storage tank, beginning about 8:30 a,m, each day, <br />Generally, the plant is run manually; Le" periodic readings of raw water and treated water <br />turbidity assist the operator in timing filter backwash operation, Production stops and high <br />service pumps are shut down during these operations, Both filters are backwashed prior to <br />resumption of production, As water rises on the filters, water level in the clarifier increases, <br />The change in clarifier level signals an automated influent valve to regulate raw water inflows, <br />After backwash, with increased filtration rates, plant influent flow is automatically increased, <br /> <br />4.2 Water Production <br /> <br />Raw water deliveries to the plant have been compiled previously in Table 1, Peak <br />plant production estimates are also based upon daily log data for calendar years 1992 and <br />1993, Table 3 shows estimates of production statistics for 1990, 1992, and 1993, These can <br />be used in comparison with performance assessment and performance limiting factors <br />addressed later in this report, <br /> <br />Of particular interest is the estimate of per capita usage of 227 gal/cap/day as an annual <br />average, This figure compares fairly well with Front Range cities, and especially the Denver <br />Metropolitan area, Note that only 30 percent of the single-family residential taps are metered, <br /> <br />14 <br />