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• IV.F Water Supply and Treatment <br />The following types of water are required at the Deserado Mine facilities: <br />Demand fire Water <br />Process Water <br />Washdown and Dust Control Water <br />Domestic Potable Water <br />Initially, the primary water source was shallow alluvial wells near the White River. However, <br />because of very high salinity of the alluvial well water, the primary water source was changed to a <br />surface lagoon near the alluvial wells that collected water pumped from the White River. Additional <br />water enters the cycle from surface moisture on the raw coal and from ground water seepage into <br />the mine. <br />IV.F.1 Water Suooly Svstem Three alluvial wells were driNed in the locations shown on Map 90. <br />The wells are approximately 50 feet deep and collect water from an alluvial aquifer fed by the White <br />River. The wells have pitless pump adapters that protrude only 1-2 feet above the surface of the <br />adjacent ground. The wells were constructed in accordance with standards set forth by the Office of <br />the Colorado State Engineer and the Colorado State Board of Health. The Alluvial Well No. 5 (AW- <br />• 5) operating plan was modified in February 1990 because of a very poor yield of water from the <br />underground rock formations. Under a revised plan, water from the existing lagoon to the north of <br />the alluvial wells access road (see Map 90) was being pumped into the AW-5 well. The existing well <br />pump then transferred this water to the raw water piping system. Later this plan was abandoned <br />and water is now pumped directly from the surface lagoon to the raw water piping system. <br />However, the wells are kept standby for emergency use. <br />A dike is constructed to separate Scullion Gulch drainage from the lagoon area. The dike is <br />approximately 100 feet long, 16 feet wide at the crest and 6 feet high with 2:1 slopes. A temporary <br />light access road, 12 feet wide and 860 feet long, was constructed for road base material haulage. <br />Vegetation was cleared as necessary. Topsoil was stockpiled and replaced at the end of the dike <br />construction. Reclamation will follow methods specified in Section V.1.4.h. See Map 90 for the dike <br />and temporary access road location. <br />During final reclamation, the wells will be removed and the access road base will be scarified and <br />leveled, Topsoil will be spread evenly over the surface and planted with the permanent seed <br />mixture shown in Table V-10. <br />Water from the surface lagoon is pumped into a pipeline that carries it to the water storage tank <br />area. The pipeline corridor is shown on Map 22. <br />• Permit Rev. 4 (11/2002) IV-2 6 <br />