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• <br />• <br />• <br />Introduction <br />To comply with the regulations set forth by the Unit States Fish and Wildlife Service (USFWS) <br />concerning the Windy Gap Process, Bowie Resources Limited (BRL) provides the following <br />updated streamflow depletion analysis of the Upper Colorado River Basin (UCRB) for water <br />usage at the Bowie No. 1 Mine. <br />The following water depletion estimate is prepazed for the changes proposed by technical revision <br />no. 32. This permit action will allow mining at a production rate not to exceed ].0 million tons <br />per yeaz with continuous miners. This permit action also provides for the unit train loadout to <br />handle and load up to 5.0 million tons per year. <br />A. Water Depletion by Category: <br />Road dust suppression -Most of the haul road at the Bowie No. 1 Mine is paved, therefore little <br />water is used for dust suppression on the haul road. Water is used to suppress dust at the bench <br />levels with most effort concentrated at the screening and crushing bench. It is estimated that an <br />average of four each 3,000 gallon water tank loads are used each day for 8 months each year. <br />This equates to 8.9 acre-feet per year. <br />Sediment Pond Evaporation: <br />Nine sediment ponds exist on the mine property. Potential depletions can occur from these ponds <br />as a result of evaporation although the majority of the ponds are typically dry for most of the year. <br />The total surface area of the ponds as measured at maximum water level is 63,959 feet or 1.47 <br />acres. Technical revision number 29 is associated with the construction of the east ridge waste <br />disposal azea. This action will increase the size of the gob pile sediment pond by 0.16 acres. This <br />translates into a total pond surface area of 1.63 acres. Using an evaporative loss of 34-inches per <br />year equates to a total loss of 4.6 acre feet per year. <br />Continuous Miner (CM) <br />Two requved 10 hours per day 7 days per week <br />Possible Minutes work per ] 0 hour shift <br />Travel Time <br />Efficiency 50% <br />Minutes worked per 10 hour shift <br />CM Details <br />Spray Details <br />CM consumption - gallons/10 Hour Shin <br />CM consumption - 2 each 10 Hours Shifts 355 days/year <br />CM consumption -acre-feet <br />1 <br />i~2-3 z <br />z~ S/ 0 0 <br />600 Minutes <br />~0 Minutes <br />-300 Minutes <br />260 Minutes <br />30 Sprays <br />1.6 gpm/spray <br />12,480 gallons <br />8,861,000 <br />27.2 <br />