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The water supply pipeline will be left in place after mine operations cease to minimize land disturbance. <br />Minimum lengths of pipeline may be removed if final grading dictates removal. <br />The temporary water pipeline was buried along the toe of the existing county road fill at a depth of <br />approximately six feet. A backhoe was used to dig the trench. A small dozer was used to push <br />approximately one foot of topsoil material to the side in those locations where topsoil exists. By clearing <br />topsoil ahead of the backhoe all topsoil was salvaged. <br />Upon successful laying and testing of the temporary water line, the overburden was backfilted in the <br />trench and topsoil spread evenly back over the disturbance. Due to extremely harsh weather conditions <br />at the time the topsoil was respread, seeding was not implemented until the spring of 1986, when barley <br />or annual rye was planted as a stubble crap. The permanent mixture was then applied in the fall of <br />1986. Areas along the pipeline excavation which had no topsoil due to previous disturbances were <br />ripped and seeded. <br />The existing waterline was routed in anon-subsidence corridor, however, due to a change in the mine <br />plan, a part of this corridor subsided but no damage to the waterline was noted. <br />Check valves were installed along the line such that if a break in the line occurs the portion of the line <br />containing the break will be isolated and the amount of water lost will be limited to only that portion of the <br />line. The pumps are equipped with pressure sensor switches that will shut the pumps off if a sudden <br />drop in pressure occurs. Thrust cushion blocks will be constructed as necessary. <br />IV.F.2 Water Storage Svstem The water storage tank area located above the "D" Portal Area (shown <br />on Map 15 and 52) contains a raw water storage tank, a potable water storage tank, and a potable water <br />treatment building. <br />The raw water tank has a capacity of 1.6 million gallons. It is an enclosed steel tank approximately BO <br />feet in diameter and 42 feet high. The tank is supported on a ring wall and compacted gravel pad <br />foundation. <br />The potable water tank has a capacity of 40,000 gallons. This tank is supported on a ring wall and <br />compacted gravel pad foundation. <br />The potable water treatment building is apre-engineered metal building approximately 40 feet wide by <br />40 feet long by 12 feet high and contains chlorination, filtration and other water treatment equipment. <br />This building has spread footing foundations and a concrete floor slab. <br />~i <br />Mine Permit Renewal #3 (Rev. 8/99) IV-27 <br />