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Rachel Kullman <br />November 12, 2008 <br />Page 2 <br />Depletions <br />The anticipated consumptive use for this plan is 36.81 acre-feet per year for up to 2.73 <br />acres of exposed water surface. <br />You have provided a monthly breakdown of the maximum annual consumptive use <br />totaling 8.09 acre-feet of evaporative loss from a maximum of 2.73 acres of exposed groundwater, <br />6.2 acre-feet for dust control, 14.72 acre-feet of water lost with 500,000 tons of mined product, 7.4 <br />acre-feet for concrete production and 0.4 acre-feet for asphalt production. <br />Depletions were lagged to the stream using a Glover analysis and assuming a distance to <br />the stream of 3,300 feet, transmissivity of 150,000 gpd/ft, specific yield of 0.2 and no-flow <br />boundary of 5,000 feet. <br />Replacements <br />The source of replacement water is fully consumable water leased from Thornton. The <br />leased water from Thornton will be released from the Metropolitan Wastewater Treatment Plant <br />("Metro"). A 0.5% per mile transit loss (14% overall loss for the 28 miles between Metro and the <br />point of depletion) was accounted for in the SWSP. <br />The lagged depletions, include depletions resulting from past uses at the site, and the <br />replacements are shown on attached Table 5. <br />Conditions of Approval <br />I hereby approve the proposed substitute water supply plan in accordance with Section <br />37-90-137(11), C.R.S., subject to the following conditions: <br />1. This SWSP shall be valid for the period of January 1, 2009 through December 31, <br />2009, unless otherwise revoked, modified, or superceded by decree. If this plan will not <br />be made absolute by a water court action by the plan's expiration date, a renewal <br />request must be submitted to this office with the statutory fee by November 1, 2009. <br />2. The total surface area of the groundwater exposed at the NCCI Pit #1 Pit must not exceed <br />2.73 acres (in the dewatering trenches and ponds) during the approval period of this <br />SWSP resulting in an annual evaporative loss of 8.09 acre-feet. <br />3. The annual amount of water used at the operation shall not exceed 6.2 acre-feet for dust <br />control, 7.4 acre-feet for concrete production, 0.4 acre-feet for asphalt production and <br />the total product mined shall not exceed 500,000 tons per year below the groundwater <br />surface resulting in 14.72 acre-feet of water lost with the product. <br />4. Total consumption at the NCCI Pit #1 Pit must not exceed the aforementioned amounts <br />unless an amendment is made to this plan. <br />5. Approval of this plan is for the purposes as stated herein. Any additional uses of this <br />water must first be approved by this office.