Laserfiche WebLink
precipitation at the property is estimated to be 9.09 inches. When subtracting the effective <br /> precipitation from the gross evaporation yields, the net annual evaporation is 32.13 inches, <br /> or 2.68 acre-feet per acre. The annual amount of evaporation from open water surfaces is <br /> 1.34 acre-feet. <br /> Mining Production & Operations: The Operator expects to extract up to 1.7 million tons <br /> annually of aggregate material from the site. All water retained in the recovered material will <br /> be replaced pursuant to the Substitute Water Supply Plan (SWSP). The total annual amount <br /> of water retained in the gravel product from mining activities totals in a maximum of 23.1 <br /> acre-feet. The SWSP is renewed annually and will reflect analysis of production and <br /> depletion anticipated in each year of operation. <br />' In addition, an estimated 4.0 acre-feet of water per year will be used for dust control based <br /> (approximately) on 5,900 gallons per day, 5 days a week for 10 months. <br /> Annually the total evaporative and operational losses from mining activities (open water <br /> surface evaporation, water retained in the aggregate product, dust suppression)totals 28.4 <br /> cre-feet of depletion which must be augmented. All depletions were lagged to the Saint <br /> Vrain River using the lagging factors approved by the State Engineer pursuant to on-going <br /> Substitute Water Supply (SWSP) approvals. <br /> (e) Indicate the projected amounts of the water sources to supply project water <br /> requirements <br /> Replacement Water. The source of replacement water for depletions will be that portion of <br /> the Operator's Last Chance Ditch Company shares, to compensate for depletions, or the <br /> Operator may lease available water in the St. Vrain River system. The State Engineer must <br /> approve a SWSP every year, providing annually or more frequently the opportunity to review <br /> the sufficiency of water supplies. These approvals require that the applicant provide a <br /> detailed explanation of the mining operations, a quantification of all mining activities and <br /> subsequent depletions and all legally available replacement sources. <br /> (t) Affirmatively state that the Applicant has acquired or applied for a National Pollutant <br /> Discharge Elimination System permit from the Water Quality Control Division <br /> The Operator will apply for a National Pollutant Discharge Elimination System (NPDES) <br /> permit from the Water Quality Control Division of the Colorado Department of Public Health <br /> and Environment prior to discharging water from the site. <br /> Ready Mixed Concrete Company—Nix Gravel Mine—MLR6 112 Permit Application <br /> Exhibit G-2 <br /> Page 24 of 126 <br />