2004-02-13_REVISION - M1987024 - Laserfiche WebLink

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Corey rn No. ~ DMG 112 Pernrit Conversion Application EXHIBIT D - Minin¢ Plan Reclamation will begin on the north end of the existing pit as mining proceeds faz enough to the south so that reclamation will not interfere with ongoing mining operation. The haul road will remain mm~ing north and south through the center of the existing pit. The operator has a continuous market for the gravel and anticipates removing material on an intermittent but yeaz round basis. Annual production is expected to be about 150,000 tons, but will vary as local demand varies. Processing equipment will be on site for approximately 30 day intervals, two to three times a yeaz to replenish stockpiles of processed material as needed. The pit walls on the west and east will be day-lighted in the vicinity of the existing pit where the landowner's property covers the entire depth of gravel The east side of the expanded pit wiII be left as a ridge that follows the level of the existing farm road to the top of the mesa. The west side of the expanded area will be left as a ridge at the current elevation of the mesa. The high- walls on the east and west side of the pit will be reduced to 3:1 (h:v) slopes using cut and fill technique as soon as practical after mining has progressed south far enough that sloping will not interfere with ongoing operations. The south side of the expanded pit azea will be sloped at 3:1 (h:v) from a point 25 feet inside the permit boundary when mining is completed. Overburden and topsoil will be replaced on slopes and the floor after final grading is done. The estimated average depth of the gravel seam is 40 feet. Gravel will be excavated to within about two feet of the underlying shale and to within 85 feet of the permitted boundary on the south and west sides. There will be no excavation or stockpiling within 30 feet of any adjacent property boundary. The operator will reduce high-walls in the mined out azea of the pit so that no more than 800 feet of un-sloped high-walls will be present at any one time. The maximum high-wall height will be 25 feet. Dozers will be used to push material down the slope so that high-walls greater than 25 feet will not be created. Final reclamation will begin when all the gravel is removed from the entire affected area. The only hazazdous materials on site will be diesel fuel and lubricating oil and grease when the crusher is on site. Oil and grease is stored in closed containers stored in a closed maintenance van. Diesel fuel is stored in a closed portable tank that will be surrounded by a secondary containment berm capable of containing the entire contents of the tank. The following narrative addresses the itemized requirements of Section 6.4.4 of the Rules a) Gravel will be mined using front-end loaders, dozers and/or excavators. b) Topsoil and overburden will be removed from the gravel deposit using scrapers, dozers or front-end loaders and stockpiled on the east side of the existing pit floor and on the east and west sides of the expanded pit azea on top of the mesa. High-walls will be reduced using cut and fill technique and dozers. Topsoil and overburden will be replaced using dozers and scrapers. c) The only water we anticipate encountering is water from an existing seep along the graveUshale interface in the southwest corner of the existing pit primarily during the summer irrigation season. A ditch around the base of the high-wall maybe needed to duect any Stormwater runoff or seepage to the southwest corner of the existing pit where it will dischazge into an existing drainage in the gulch west of the property. Straw bales or silt fencing will be used to ensure that only clean water leaves the affected lands.