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<br />. <br /> <br />Jl tE.uLJ.-1 ITEM (8 Cl <br />A!t7v, 7, ;c:J95 <br /> <br />1 <br />r <br /> <br />~ <br /> <br />3.3 Water Production <br /> <br />Raw water deliveries to the plant have been compiled previously in Table I. Peak plant <br />production estimates are also based upon daily log data for calendar years 1992 and 1993. Table <br />2 shows estimates of production statistics for 1990, 1992, and 1993. These can be used in <br />comparison with performance assessment and performance limiting factors addressed later in this <br />report. <br /> <br />:-"; <br /> <br />Of particular interest is the estimate of per capita usage of 227 gallcap/day as an annual average. <br />This figure compares fairly well with Front Range cities, and especially the Denver Metropoli tan <br />area. Note that only 30 percent of the single-family residential taps are metered. The town <br />Utility Department estimates that non-metered taps consume nearly three times as much water <br />as metered taps. Over the three year period, observed usage varied from about 112 to 763 <br />gal/cap/day. Also of interest is the current peak day usage (production) of about 1.03 million <br />gallons per day, which equals about 763 gal/cap/day and includes outdoor uses and commercial <br />uses. <br /> <br />3.4 Major Unit Process Evaluation <br /> <br />Raw Water Intake. Presedimentation. and Raw Water Pioeline <br /> <br />-.:: <br /> <br />x- <br /> <br />The raw water intake structure on North St. Vrain Creek consists of a diversion dam and <br />a headwall with inlet slide gate. Through time, a pool has been established upstream of the <br />diversion dam. However, the dam is a rock:fill dam with a deteriorating concrete cap. Water <br />may be lost through cracks in this structure. Additionally, sediment appears to build up adjacent <br />-., to and down-ditch from the gate, requiring periodic maintenance. Large sediments are dropped <br />." just after entering this gate. A concrete, rectangular presedimentation channel separates smaller <br />fines from the flow. A side gate is available to sluice this channel and purge accumulated fines. <br /> <br />Raw water next passes through a debris SCteen to enter the raw water pipeline. This intake <br />system appeared to operate well at the time of the field visit, but will require improvement as <br />diversions increase over time. <br /> <br />At several points the raw water pipeline is touted in the bank of the creek. These vulnerable <br />points seem to be adequately protected by tock overlay. The line is reportedly giving gDod <br />service. An estimate was made of the hydraulic capacity of the intake system. Assuming <br />submergence of the pipeline inlet, the line could pass approximately 1600 gpm, or up to 3.6 ds. <br />On a 24 hour basis, continuous flow would deliver up to 2.3 MGD. No change to the pipeline <br />is recommended at this time. <br />