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during crushing of mined basalt. Table G -2 shows the total consumptive uses anticipated for this <br />site. <br />5.1 Dust Control — Disturbed Areas <br />Water used for dust suppression is usually 100 percent depletive with no measurable return flows <br />to the river system. The main access road into the mine is paved. Water will be used on all <br />other internal roads. Water will only be applied when needed at this elevation, since the cold <br />conditions on site for much of the year result in little evaporation and/or dust. The main <br />access road is paved to reduce the water requirements. It is assumed that watering of roads <br />will require approximately 5000 gallons water six times a day for 150 days per year. Other days <br />will have natural moisture on the roads or the site will be inactive since the annual production is <br />not very high. This is equivalent to approximately 13.8 acre feet per year. <br />5.2 Dust Control - Crushing and Screening Plant Operations <br />The crushing and screening plant uses roughly 9.2 acre feet per year. <br />5.3 Asphalt plant operation <br />The asphalt plant requires approximately 4.0 acre feet per year. <br />5.4 Potable water for drinking <br />Potable drinking water will be purchased commercially and will not be considered in the <br />consumptive use calculations. <br />Ralston Quarry, February 2015 G -3 <br />