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WATER INFORMATION EXHIBIT G <br />1. Surface Water General Discussion <br />The pre-mine site is very flat (less than 1%) except for the portion immediately adjacent to the <br />River, which has a steeper slope. There aze no natural drainages on the site. One historic irrigation <br />ditch (Sunrise Ditch) runs from La Salle Road to the north through the permit azea east of the <br />proposed lake. This ditch will be maintained over the life of the project and will remain after <br />reclamation. The ditch will feed the augmentation pond shown on Map C-2. The pre-mine use of <br />the site was irrigated field in the flat azeas and wildlife habitaUrange neaz the River. <br />Other irrigation ditches exist to the north, west and south of the permit area but these will not be <br />affected by the operation. <br />Other than the bridge crossing and the lowest portions of the access road, all activity azeas for this <br />operation are out of the 100 yeaz floodplain of the River. There aze no wetlands which will be <br />disturbed by this operation. There is an approved US Army Corps of Engineers permit for the <br />bridge crossing. <br />During the mining operation, the pit excavation and augmentation pond will hold all runoff from <br />the site. It will enter the pit, pass through the gravel filter to the pump. It will then be pumped to the <br />settling pond, as shown on Map C-2. From this pond, the water will dischazge into the River in the <br />ditch shown along the access road to the bridge. A combined StormwaterlProcess Water NPDES <br />Permit is being obtained for this discharge. <br />The two principal ways that the gravel pit could affect the water quality of the area downstream is <br />through poor sediment control within the site causing increased sedimentation downstream and by <br />fuel leakage from a ruptured tank. As described in the mining plan, the pump filter and settling <br />North R-34 Pit I/07 <br />18 <br />