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to a relatively level elevation, continuing until sufficient quantity of aggregate is <br />removed to fulfill requirements for the project. <br />9. The slopes of the excavation will be made a 4H:1 V slope or flatter. The slopes <br />will be graded as the excavation proceeds and vertical pit walls will not be <br />necessary. <br />10. The dimensions will be as shown on Exhibit E — Mining Plan Map. The pit limits <br />are rectangular in shape with leg lengths of approximately 750 feet long (N — S) <br />and 1,600 feet wide (E — W) for an affected area of 26.0 acres within the <br />excavated area. <br />11. There will be a depression left after mining operations are completed but no <br />impoundments or drainage alterations will be left in the reclaimed area. <br />12. Water will be used within the pit will be for dust control only. The source of this <br />water will be from the City of Vona. Total usage will be approximately 2 acre - <br />feet. <br />13. A storm water management plan will be filed with the Colorado Department of <br />Health to maintain the hydrologic balance. <br />14. This excavation is into virgin ground. It is not anticipated that any foreign refuse <br />or acid or toxic producing materials will be encountered. <br />15. Since the before and after use of the land is rangeland, minimal change will result <br />to the hydrologic balance, no off -site damage will occur and the slopes and other <br />general configuration of the land will be more stable for the current and reclaimed <br />use due to elimination of existing erosion (caused by normal natural wind and <br />water action over time) . No standing water will be retained longer than 24 hours. <br />In addition, the excavated area will be mulched to eliminate topsoil erosion. <br />16. Excavation will be kept above the known ground water elevation. The operation <br />will not require any type of dewatering. This is evidenced by the depth of wells in <br />the area (see attached Pottorff well permit) that exhibit a ground water elevation <br />of approximately 4430' (4508' surface elevation - 78' water level) which is well <br />below the proposed floor of the pit at 4485'. <br />17. This property is hilly with slopes crossing the proposed pit limits on the south and <br />westerly sides of the mining area. It is the intent to excavate the property so as not <br />to allow any runoff from excavated area and not intersect any natural drainage <br />ways. Adequate temporary berming (as shown on Exhibit E — Mining Plan Map), <br />will be performed on the north and west sides of the mining areas to insure runoff <br />water will be contained in the pit floor. The pit floor material is granular and <br />water will percolate into the pit floor. Should it become necessary silt fences will <br />