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WATER INFORMATION EXHIBIT G <br />kl. 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 %% hick xx ill not occur due to the nxmsures described <br />in the minim exhibit Mid by fuel leakage from .i mplured tank on the plan) oi Nome equipment. <br />Fuel leakage is also not a problem since the only fuel tank onsitc on the screening plant will have <br />secondary containment. As seen in the water data in Appendix 13, selenium in the Arkansas <br />River runs at approximatey ld ug /liter. t,-. .. disehaFge of" — =.-. the ,... hi . <br />tie! oeetif dae it) the meflsui descr in !he iiining exhibit, and b) by fee leaka2e reni s <br />favubt Ed i wilt 01i die plait! orsome equipmeiit. Fuel leakage is also iiat a pfeblem sinee the on!) <br />at ftppfox <br />The <br />CDPHE determined that the level of selenium chronic to aquatic life is 4.6 pgAiter. The acute <br />level is 18.4 pg/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 forted 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 />Korinek 91 Pit August 09 G -1 <br />