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6.4.7 Exhibit G -Water Information <br />hole survey of the site conducted by Weiland, Inc. in 2004 reveals that the <br />aquifer's upper limit is approximately 6-8 feet below ground surface. The local <br />groundwater flow direction is east and sub-parallel to the Big Thompson River. <br />Mining will occur to a depth of approximately 22 feet, which would intercept the <br />groundwater table. However, this proposed mining operation is expected to <br />affect the groundwater system due to the construction of a slurry wall around <br />three of the four mining cells in the West pit and around two of three cells in the <br />East pit prior to mining and the dewatering of the remaining unlined pits. Prior to <br />slurry wall construction, an engineered drainage system will be constructed to <br />facilitate the flow of groundwater around the proposed slurry wall, to prevent <br />groundwater mounding and shadowing around these subsurtace structures. <br />Project Water Use <br />Depletions to the Big Thompson River will occur due to ground water taken with <br />the mined product and evaporative loss. <br />Table 6.4.7 - 1 Project Estimated Stream Depletions <br />Source Amount Replacement Source <br />Evaporative Loss < 1 AF/yr LRM Lease with City of Loveland <br />Water Removed with Mined Material 5.89 AF/yr LRM Lease with City of Loveland <br />Table 6.4.7 - 2 Project Estimated Water Usage <br />Use Amount Source <br />Dust Control (During Mining) 3.2 AF/yr Green/Croissant Pit" <br />Irrigation (For Reclamation) 40 AF/yr LRM's Hillsborough Ditch Shares <br />* The Green/Croissant Pit SWSP was amended and approved on January 22, <br />2007 to include dust control water for the BokelmanNValters project. <br />Stormwater Management <br />An application is being sought through the Colorado Water Quality Control <br />Division for a stormwater discharge permit for sand and gravel operations for this <br />site. Execution of the associated Stormwater Management Plan will protect the <br />Big Thompson River from excess sedimentation. <br />February 20, 2006 BokelmaNWalters Pit <br />Page 18 of 36 Regular 112 Permit Application <br />