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WATER INFORMATION EXHIBIT G <br />1. Surface Water General Discussion <br />The site and adjacent properties are currently used as rangeland. The pit is within a mile of the <br />Arkansas River. The pit's proximity to the river is not expected to be an issue. The 100 year <br />flood plain does not enter the permit boundary. <br />The two principal ways that the gravel pit could affect the water quality of the area downstream <br />are through discharge of water from the site, which will not occur due to the measures described <br />in the mining exhibit; and by fuel leakage from a ruptured tank on the plant or some equipment. <br />Fuel leakage is also not a problem since the only fuel tank onsite on the screening plant will have <br />secondary containment. As seen in the water data in Appendix B, selenium in the Arkansas <br />River runs at approximately 14 gg /liter. The CDPHE determined that the level of selenium <br />chronic to aquatic life is 4.6 gg /liter. The acute level is 18.4 µg/liter. <br />According to searches on the Division of Water Resources database, there are no wells which are <br />within 600 feet of Korinek Pit #1. <br />2. Groundwater <br />The site will mine a sand gravel deposit which is alluvial from the Quaternary age formed on a <br />bend of the Arkansas River. The alluvium is relatively shallow (less than 40 feet thick) and is <br />underlain by Pierre Shale. The shale deposit is expected to be approximately 30 feet thick. <br />Water is expected to be encountered 50' below the surface and approximately 10' below the final <br />mining surface. <br />Korinek commits to not mining within 2 feet of the expected upper limit of the water table. <br />Korinek #1 Pit August 09 G -1 <br />