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maximum exposed surface area at the site during mining is estimated at 1.80 acres. IHC Scott <br /> plans to keep the site dewatered throughout the life of the mine. <br /> Evaporation data was taken from NOAA Technical Report NWS 33, Evaporation Atlas for the 48 <br /> Contiguous United States. The annual gross evaporation was determined to be 45 inches for this <br /> location. Monthly evaporation percentages are established by guidelines set by the State <br /> Engineer's Office.To determine precipitation,data from the National Weather Service for Greeley, <br /> CO(UNC) (1967-2022)was used.The long-term average precipitation at the Bernhardt Sand and <br /> Gravel Pit mining site is estimated at 14.26 inches. Effective precipitation is calculated as 70% of <br /> the total precipitation. The net evaporation is the difference between gross annual evaporation <br /> and effective precipitation. The resulting net evaporation is 2.56 feet. <br /> The maximum evaporative loss from the 1.80 acres is 4.61 ac-ft. <br /> Operational Loss <br /> The average annual production from the Bernhardt Sand and Gravel Pit mining site is estimated <br /> at 650,000 tons. Using 4% moisture content, the total associated consumptive use for water <br /> retained in the material mined is 19.13 ac-ft. <br /> Dust control use is 10,000 gal/day, 6 days/week, 4 weeks/month for 10 months of the year. This <br /> equates to 7.4 ac-ft. <br /> Maximum annual operational loss is estimated to be 26.53 ac-ft for Phase 1. <br /> Consumptive Use <br /> The maximum annual consumptive use (operational loss + evaporation loss) at this site during <br /> the mining operation is estimated to be 31.14 ac-ft for Phase 1. <br /> Replacement Water <br /> The replacement of consumptive uses at the site is will be accounted for in a substitute water <br /> supply plan (SWSP) approved by the State Engineer. The SWSP will be obtained prior to any <br /> mining activities occurring that expose groundwater. <br /> Surrounding Water Rights <br /> The attached Figure A-1 Well Permits in the Bernhardt Sand and Gravel Pit — Groundwater <br /> Evaluation by McGrane Engineering, LLC shows the permitted wells within 600 feet of the mining <br /> limits and permitted wells within the boundaries of the groundwater model/evaluation. The well <br /> information and locations were obtained from the Division of Water Resources online mapping <br /> well permit locator. This well and water rights information was cross checked with the State's <br /> CDSS. Between the sources, all permitted and decreed wells are included. Table G-1 below is a <br /> corresponding list of wells as numbered in the Bernhardt Sand and Gravel Pit — Groundwater <br /> Evaluation by McGrane Engineering, LLC that is attached that are within 600 feet of the mining <br /> limits. <br /> IHC Scott,Inc. <br /> �� J&T Consulting,Inc. Bernhardt Sand and Gravel Pit <br /> "I DRMS 112 Permit Application <br />