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The land owner of the subject site, Midwestern Resources, owns water rights which have <br />been used to irrigate the subject property along with other properties. They intend to use <br />them as the source of augmentation water to offset the groundwater consumption both <br />during and after mining. <br />~~oretlve Losses <br />The NOAA Technical Report NWS 33, 'Evaporation Atlas for the Contiguous 48 United <br />States', published by the U.S. Department of Commerce was used to determine the <br />amount of evaporation. The annual evaporation is 62 inches at the subject location. <br />Precipitation at the site was found by using data from the publication, 'Climatography of <br />the United States No. 81'. The precipitation at the mine site is estimated to be the same <br />as that found at the nearest weather station which is located in Holly. The annual mean <br />precipitation is 14.44 inches/year. <br />Effective precipitation was determined in order to compute the net lake evaporation. <br />Effective precipitation was computed as 70% of the total precipitation. Effective <br />precipitation was then subtracted from the gross evaporation to obtain the net <br />_ evaporation. The net annual evaporation from a lake surface at the subject site is 4.32 <br />ft (51.9 inchesj. <br />Therefore, the average annual net evaporation from the 410 acres of lake surface will be <br />1,771 acre-feet. <br />Ooeretlonel Consumptlve Uses <br />Water is retained in the material which is exported off the site. It is estimated that 4% of <br />the gross weight of the products is water as suggested by the State Engineer's Office. <br />Approximately 800,000 tons of material will be mined from the pit each year. This <br />equates to 23.5 acre-feet of consumptive use. <br />Dust control is being handled by applications of water to the haul roads. Estimates of the <br />water used are based on applications by water trucks to approximately 5 acres in the <br />processing plant area. An average of two 1/8 inch applications of water per day will be <br />used. Dust control will be required approximately 120 days each year. Therefore the <br />annual projected water use for dust control at the site will be 12.5 acre-feet. This water <br />will be fully consumed. <br />Water will be used for the washing operation at the processing plant area. Three 100 ft <br />x 200 ft settling ponds will be constructed for the washing operation. The wash water will <br />be contained during washing and routed to the settling ponds and then recycled through <br />the system again. All water losses associated with the washing process should be <br />negligible with the exception of the 4% loss contained in the material that is mined and <br />exported off site and evaporation from the 1.4 acres of settling ponds. <br />G-2 <br />