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2. Groundwater <br /> The site will mine sand and gravel deposit in the high alluvial terrace to the west of the <br /> Uncompahgre River. The Uncompahgre River and floodplain are >150 feet lower in elevation <br /> than the unmined surface of the Base Products Gravel Pit#2. It is not expected that <br /> groundwater will be encountered during any phase of mining. <br /> 3. Water Consumption for the Operation and Water Rights <br /> Because groundwater is unlikely to be encountered during any phase of mining at the Base <br /> Products Gravel Pit#2, no Substitute Water Supply Plan (SWSP) is in place or required for <br /> Montrose County. Because the alluvial gravel to be mind is dry, no water losses will occur from <br /> the gravel resource during mining. <br /> Any water required for dust mitigation and the washing or crushing of gravel will be purchased <br /> and brought on site by an independent operator. Depletions for gravel washing operations have <br /> been calculated to be 500 gallons per day based upon previous experience. It is expected that <br /> the gravel washing operations will be in operations a maximum of 52 weeks per year and 5 days <br /> per week. This would result in a consumption of 0.34 acre-feet per month with a total of 4.08 <br /> acre-feet per year. <br /> Dust will be controlled by both magnesium chloride and water. Water will only be used to spot <br /> water between applications of magnesium chloride in order to eliminate any problem dust areas. <br /> 3.0 acre-feet per year will be allocated to dust control, or 0.25 acre-feet per month. <br /> Therefore, total annual depletions for the gravel mining operations are estimated to be 7.08 <br /> acre-feet per year. <br /> Base Products Gravel Pit 2 <br /> April 2022 G-3 Lewicki&Associates <br />