2020-03-05_PERMIT FILE - M2020018

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The water uses are dependent upon the breakdown of products forecast for the pit production and sales. This breakdown is given below: 5_1 Crushing and Screening Plant Operations The crusher will be an enclosed crusher with internal water sprays. Water sprays will also be present at the material feed and the screen deck. The production rate during operations is expected to be 180 tons per hour which will require 160 gallons of water per hour with a total annual operating time of 1250 hours. A conservative estimate of 200 gallons per hour will be used in these calculations. • 200 gallons/hour X 1250 hours/year = 250,000 gallons/year • 250,000 gallons/year = 0.76 acre feet per year 5.2 Control Dust on Disturbed Areas Water used for dust suppression is usually 100 percent depletive with no measurable return flows to the river system. Dust from the haul roads will be controlled by paving for all areas outside the mining pit boundary. Water will be used on all in pit roads. Water will only be applied when needed at this elevation, since cold conditions on site for much of the year result in little evaporation and/or dust. It is assumed that watering of roads will require 1700 gallons water 4x per day for 100 days per year. Other days will have natural moisture on the roads or the site will be inactive since the annual production is not very high. This is equivalent to 2.09 acre feet per year. It is also assumed that minor amounts may be needed during very dry windy conditions during the mining operation. This use is expected to be 1.2 acre feet per year. Therefore, the total consumptive use for this category is 3.29 acre feet per year. • 1700 gallons/application X 4 applications/day X 100 days = 680,000 gallons/year • 680,000 gallons/year = 2.09 acre/feet/year • 2.09 acre feet/year regular use + 1.2 acre feet/year contingency use = 3.29 acre feet/year Rincon Materials G-6 G-{; l.wicti and Asxocislrti, k9,L( February 2020