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<br />11-15 <br /> <br />. <br /> <br />. <br /> <br />by 1600 feet of six-Inch 0.0. steel pipe to a sand trap at a point <br />where the pipe crosses Leroux Creek. Below the sand trap is 56 feet <br />of 12 inch plastic lrne that changes to. 201 feet of 10 inch pipe which <br />in turn enters 5.1 miles of eight inch low-head pipeline which <br />delivers the water to the town's settling pond. Most of this <br />clay-tile pipeline, oriqinally constructed in 1907, has been <br />replaced and in places realigned. Gabby George estimates that <br />only 10% of the line is currently tile, with 80% being 8-inch <br />low-head plastic pipe and the balance being 8-inch steel. Portions <br />of the low-head plastic pipe have been stressed out of its original <br />round shape. The flow capacity of this line is about 1.5 to <br />2.0 cfs (0.97 mgd to 1.29 mgd). There apppears to be significant <br />leakage and water loss in this 1 ine. In January, 1976, the pipel ine <br />above the settling pond was dug up in eight places to remove <br />a blockage. There are two water taps on the transmission line <br />upstream of the chlorination station. Because the line has insufficient <br />capacity for future growth, and because of high maintenance and losses, <br />it is anticipated that the raw water transmission line will have to be <br />replaced in future years. <br /> <br />Sea 1 i ng Pond <br /> <br /> <br />At the downstream end of the first segment of the transmission line the <br /> <br /> <br />water enters an unlined earth settling pond (redesigned in 1948) with <br /> <br /> <br />a capacity of 2,700,000 gallons (8.3 acre-feet). The purpose of the <br /> <br /> <br />pond is to settle out large particles in the water and to help main- <br /> <br /> <br />tain a stabilized raw water supply for the treatment facil ities. <br /> <br /> <br />Under normal operating conditions the reservoir spills some water <br /> <br /> <br />because there is more water entering the pond than there is demand. <br /> <br /> <br />This pond has not been cleaned in many years, in part due to the <br /> <br />fact that the outlet works for draining are silted shut. The ori- <br /> <br /> <br />ginal capacity of the reservoir is reduced due to the accumulation <br /> <br /> <br />of silt and sand on the bottom over the years. The pond has a <br /> <br /> <br />single cell. The average detention time of the water in the <br /> <br /> <br />pond is probably only a few hours because of short circuiting. <br />