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acres. Prowers Aggregate Operators, LLC. will keep the site dewatered throughout the life of <br /> 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 60 inches for <br /> this 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 the <br /> Lamar, CO (054770) (1893-2016) was used. The long-term average precipitation at the West <br /> Farm Pit is estimated at 15.2 inches. Effective precipitation is calculated as 70% of the total <br /> precipitation. The net evaporation is the difference between gross annual evaporation and <br /> effective precipitation. The resulting net evaporation is 4.1 feet. <br /> The maximum evaporative loss from the 5.36 acres is 22.0 ac-ft. <br /> Operational Loss <br /> The maximum annual production from the West Farm Pit site is estimated at 2,500,000 tons. <br /> Using 4% moisture content, the total associated consumptive use for water retained in the <br /> material mined is 73.6 ac-ft. <br /> Dust control use is 10,000 gal/day, 5 days/week, 4 weeks/month for 10 months of the year. This <br /> equates to 6.2 ac-ft. <br /> Maximum annual operational loss is estimated to be 79.8 ac-ft. <br /> Consumptive Use <br /> The maximum annual consumptive use at this site during the mining operation is estimated to <br /> be 101.8 ac-ft. <br /> Replacement Water <br /> The replacement of consumptive uses at the site are accounted for in a substitute water supply <br /> plan (SWSP) approved by the State Engineer for the Lower Arkansas Water Management <br /> Association (LAWMA). <br /> The following water sources will provide the necessary replacement water for the site: <br /> • LAWMA shares owned by GP Aggregates, LLC. See the attached Certificates. <br /> Surrounding Water Riqhts <br /> Figure Exhibit G-1 shows the permitted wells within 600 feet of the mining limits. The well <br /> information and locations were obtained from the Division of Water Resources online mapping <br /> well permit locator. Table Exhibit G-1 below is a corresponding list of wells as numbered in <br /> Figure Exhibit G-1. <br /> M Prowers Aggregate Operators, LLC. <br /> t JaT Consulting,Inc. West Farm Pit—M-2008-078 <br /> DRMS 112 Permit Amendment Application <br />