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Precipitation was estimated using Colorado Climate Center Website data. Annual precipitation <br />at this site was assumed equal to the precipitation at the nearest station, which is the Greeley <br />UNC Weather Station. The annual mean precipitation is 14.2 inches. Effective precipitation <br />was calculated as 70% of total precipitation. Net evaporation was then computed as the <br />difference between gross evaporation and effective precipitation. Net evaporation at the site was <br />calculated to be 2.9 feet. <br />The total exposed surface azea at the site that requires augmentation is 56.9 acres (Figure G-]). <br />The total evaporative consumptive use for the site will be 166.2 acre-feet per yeaz. <br />The moisture content of the material transported off the site was assumed to be 4% by weight as <br />required by the SEO. The annual amount of mined product for the pit is estimated at 100,000 <br />tons. This results in 2.9 acre-feet of water retained in the product mined annually. <br />Dust control is required for internal haul roads and stockpiles. When mining commences at the <br />25'h Avenue site, it is anticipated 1.0 acre-foot will be required for dust control as was previously <br />used in the Greeley West substitute supply plan. <br />The estimated total annual consumptive use associated with the mining operation is summarized <br />as follows: <br />Consumptive Use Annual Water Loss (acre-ft) <br />Evaporation 166.2 <br />Moisture Retained in Product 2.9 <br />Dust Control 1.0 <br />Total 170.2 <br />Sources of Water <br />The SEO tracks the substitute supply plan for each mining site by the DMG number. When a <br />number is assigned by the DMG, the City of Greeley will complete a new substitute water supply <br />plan and well permit application for the 25's Avenue site. The new plan will be submitted to the <br />State Engineer's Office and will make replacements for the depletions from the mining <br />operation. <br />The City of Greeley will provide augmentation water for the substitute supply plan by making <br />releases of reusable effluent from the wastewater treatment plant to make replacements for <br />mining depletions. 'This replacement source is regularly accepted in substitute supply plans by <br />the SEO in this reach of the Poudre River. <br />Surrounding WaterRiQhis <br />As mentioned previously, the 25`h Avenue site lies inside the Greeley West permit boundary. <br />The Greeley West Pit has operated with a substitute supply plan since 1990 without injury to <br />surrounding water rights. On February 21, 2001, Deputy Water Commissioner Mark Simpson <br />completed a 600-foot well permit inspection of the Greeley West Pit for a new well permit <br />25id Avenue Srte <br />DMG 1 /2 Permit <br />Page IJ <br />