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Consumptive use <br />Max Acre- <br />feet/yr Use <br />Comments <br />1. Placer Excavation Pit 9000 sf <br />0.44 <br />2. Processing Ponds 18000 sf <br />0.87 <br />3. Infiltration Pond 32230 sf <br />1.54 <br />4. Water Evap. From gravel <br />excavation and sale <br />1.03 <br />Based on sale of 70,000 tons sold per <br />year <br />5. Watering of roads <br />0.37 <br />6. Spray water in gravel crushing <br />and screening <br />0.19 <br />Total <br />4.44 <br />This is a maximum consumptive use <br />based on full operation. <br />Other consumptive uses on site include: <br />Water evaporation from gravel excavation and sale: <br />Approximately 2% of the weight of the material sold will be water from below the water table that <br />is not recovered. Assuming 70,000 tons of gravel sales per year, this is 1400 tons of water. This is <br />equivalent to 1.03 acre feet per year <br />Watering of roads on site for dust control: <br />Assumes watering roads with 1000 gallons water 2x per day for 60 days per year. This is based on <br />the gravel operation being shut down from December through April. Other days will have natural <br />moisture on the roads. This is equivalent to 0.37 acre feet per year <br />Spray water in the gravel crushing and screening operation for gravel sales: <br />The crushing and screen plant will only operate approximately 80 days per year. The plant will <br />use approximately 6 gallons per minute x 7 hrs /day x 80 days /yr. This is 201,600 gallons. <br />Approximately 50% of this water will flow immediately back into the gravel below the stockpile <br />and some of it is already accounted for in the 2% by weight calculation of the material. Therefore, <br />only 30% of this water flow is actually consumed by evaporation. This is 60,480 gallons, which is <br />0.19 acre feet. <br />Summary of Consumptive Uses <br />