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<br />Derr Pit Project <br />DRMS 112 Permit Amendment <br />net annual evaporation was calculated as 2.93 ft, and thus, the resulting net annual <br />evaporative consumptive use during the mining operation is 3.4 ac-ft. <br /> <br />The annual production from the Derr Pit site is estimated at 300,000 to 600,000 tons. <br />The moisture content of the material hauled off the site for Phases 1 – 7 was assumed <br />to be four percent by weight; this results in an annual amount of 8.8 ac-ft of water <br />retained in the product at production of 300,000 tons. Dust control is also required for <br />internal haul roads and stockpiles and estimated to be 3.8 ac-ft. <br /> <br />The maximum total annual consumptive uses associated with Phases 1 – 7 of the <br />mining operation are estimated as follows: <br />Evaporation (acre-feet) 3.4 <br />Dust Control (acre-feet) 3.8 <br />Moisture Retained in Product (acre-feet) 8.8 <br />TOTAL (acre-feet) 16.0 <br /> <br />Between the second and third year of mining, a slurry wall liner will be constructed <br />around the pit. Following mining, reservoir(s) will be created at the mining site with a <br />surface area of approximately 66.20 acres. <br /> <br />Replacement Water <br /> <br />The replacement of consumptive uses will be accounted for in a Substitute Water <br />Supply Plan (SWSP) that is administered by the SEO. This plan will be in place prior <br />to mining in Phase 1. <br /> <br />Surrounding Water Rights <br /> <br />The following index map and table shows the permitted wells within possible influence <br />of the mining and dewatering operations for this site. The well permit map itself was <br />obtained from the Colorado Division of Water Resources’ (SEO’s) latest online <br />Geographic Information System (GIS). Although there may be other wells in the area, <br />they are not registered and permitted with the SEO. <br /> <br />As required by the SEO, a gravel pit well permit will be obtained for the proposed uses <br />of groundwater at the site prior to mining commencing in Phase 1. If the proposed use <br />of groundwater at the Derr Pit site results in material injury to surrounding wells, Broken <br />Arrow Investments, LLC will ensure that all necessary actions or measures are taken to <br />address or remedy the injuries. <br /> <br /> <br />Water Quality <br /> <br />An application for a CDPS Permit will be submitted to the Colorado Department of <br />Public Health & Environment (CDPH&E), Water Quality Control Division, for the Derr Pit