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• Water Information Exhibit G <br />1. Surface Water General Discussion <br />The permit area's pre-mine land use is basically irrigated pasture. Some adjacent properties are <br />currently used as rangeland, irrigated pasture or wetlands for wildlife habitat. The White River exists <br />to the south of the property and is within 900 feet of the permit boundary, although the mining <br />operations will not have any impact on the river or any other structures related to the river. Cover on <br />the irrigated pasture is good as seen in Exhibit J. <br />The pit is within 900 feet of the White River. The pit's proximity to the river is not expected to be an <br />issue. The 100 year flood plain, as determined by the FEMA maps, does enter the permit area, however <br />there will only be minimal mining within the 100 year floodplain and no filling will occur above the <br />original topography of the area, so as not to raise the floodplain in other areas. Quality and flow rates <br />for the river at this location can be found in Appendix B. <br />• <br />The 100 year flood would enter the pit when Phase 3 mining occurs. In this case, water will fill the pit <br />to the flood level and it will subside to the equilibrium ground water level, which is approximately 2 <br />feet below the existing ground surface. After the site is reclaimed, a 100 year flood will still fill the <br />lake, but the low point at the southwest corner of the pit will keep the lake elevation at about 5712'. <br />Quality and flow rates for the river at this location can be found in Appendix B of the DRMS 112 <br />Permit. <br />During mining, all of the disturbed area will drain to the pit/lake instead of to the River. Once mining <br />and reclamation are complete, the entire disturbed area will drain to the lake. <br /> <br />White River City Pit, January 09 G-1