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Consumptive Use A portion of the water used for domestic purposes is evaporated or transpired into the atmosphere; this is commonly called consumptive use. Aseptic tank/leach field system will be used for the treatment of domestic wastewater. About 90 percent of the water used for domestic purposes will discharge from the septic tank/leach field system, will enter the shallow alluvium, and will flow toward Hubberson Gulch. The remainder, 10 percent, will be consumptively used. Therefore, about 0.10 acre-foot of the domestic water will be consumptively used and 0.90 acre-foot will accrue to Hubberson Gulch. Much of the water applied for dust suppression will evaporate from soil and spoil pile surfaces. For purposes of the proposed plan for augmentation, it is assumed that alt water used for dust suppression and other industrial purposes will be consumptively used. Therefore, the consumptive use associated with industrial purposes is estimated to be about 25.0 acre-feet per year. Small erosion and sediment control ponds probably will be constructed near each mine pit. These ponds will retain water for short periods of time following precipitation events and will dewater automatically. Therefore, evaporation from these ponds will be minimal. The estimated consumptive use for water uses at the Seneca II-W Mine is shown in Table 3. Water Supply Sources Domestic water will be obtained from Seneca II-W Well No. I (hereinafter "Well No. I"), which will extract water from the Trout Creek Sandstone formation. The well site is located in the SW'k NW'b of Section 22, Township 5 North, Range 88 West and will have a capacity of about 35 gpm. Water supplies for industrial uses will be obtained from surface water stored in Pond 006 and from Well No. 1. Pond 006 will be located on an unnamed tributary to Hubberson Gulch in the NW4, of Section 22, Township 5 North, Range 88 West. The pond will store surface runoff and the discharge from the mine pits for industrial uses, sediment decantation, and flood flow retention. Pond 006 will be excavated into the alluvium to a capacity of 29.32 acre-feet. The maximum water surface area will be about 1.71 acres. A water storage right was decreed for Pond 006 by the District Court for Water Division No. 6 in Case No. 88CW89. A copy of this decree is shown in Appendix A. Ground water and surface water will be pumped from the mine pits to Pond 006 through ditches and pipelines to be constructed as part of the mine development. This water will be stored for later use for industrial purposes or decanted and released to the 3