2007-08-10_REVISION - M2001107 - Laserfiche WebLink

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the Fort Lupton weather station (1950-1975) and the Brighton weather station (1976-2005) were used. Missing data was replaced with the average for the period. The long-term average precipitation at NCCI Pit #1 is estimated at 13.4 inches. Effective precipitation is calculated as 70% of the total precipitation. The net evaporation is the difference between gross annual evaporation and effective precipitation. The resulting net evaporation is 3.0 feet. The maximum evaporative loss from the 1.6 acres is 4.7 ac-ft. Operational Loss The average annual production from the NCCI Pit #1 site is estimated at 400,000 tons. Using 4% moisture content, the total associated consumptive use for water retained in the material mined is 11.8 ac-ft. Dust control use is 10,000 gal/day, 5 days/week, 4 weeks/month for 10 months of the year. This equates to 6.2 ac-ft. Maximum operational loss is estimated to be 18.0 ac-ft. The maximum annual consumptive use at this site during the mining operation is estimated to be 22.7 ac-ft Realacement Water The replacement of consumptive uses at the original site is accounted for in a substitute water supply plan (SWSP) approved by the State Engineer. The current SWSP is valid through December 31, 2007. NCCI will operate NCCI Pit #1 in accordance with this approved SWSP. At the time of renewal, the SWSP will be amended to include the original site plus the expansion property. Mining in the expansion area will not occur until after 2007 when a new SWSP has been submitted and approved. The following water sources will provide the necessary replacement water for the site: • Three shares of Lupton Meadows Ditch Company owned by NCCI • Leased water from the Consolidated Mutual Water Company • Leased water from the City of Greeley Surrounding Water Rights Figure Exhibit G-1 shows the permitted wells within '/: mile of the site. The well information and locations were obtained from the Well Look database at the Division of Water Resources and water rights tabulation. This well and water rights information was cross checked with the State's CDSS. Between the sources, all permitted and decreed wells are included. Table Exhibit G-1 is a corresponding list of wells as numbered in Figure Exhibit G-1. A gravel pit well permit has been approved for the original site. At the time of SWSP renewal, a new gravel pit well permit will be applied for to include the additional evaporative and operational losses from the inclusion of the expansion property. If the proposed use of groundwater at the NCCI Pit #1 site results in material injury to surrounding wells, NCCI will ensure that all necessary measures are taken to address the issues. NCCI Pd #1 ORMS 172 Permit Amendment 42