2022-07-19_REVISION - M1987026 (11)

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and dewatering will be necessary during all active quarry operations as the quarry is deepened. Dewatering will be carried out such that all water reports to the sediment ponds below the pit, where it will be temporarily detained. Dewatering will typically be carried out only prior to and during normal scheduled operations,which presently is seasonal and depending on demand. At most, pumping may only be necessary once a month, and would involve removing up to 50,000 gallons each time. Pumps move approximately 100 gallons per minute,which takes one day to empty the sump in the pit. Water is discharged into the stormwater pond downslope (southwest)from the pit and staging pad. At this rate and volume there is no sediment transport and the pond is not overtopped. Water that is pumped from the quarry(which will be inherently free of sediment)will be routed to the sediment control/stormwater pond below the toe of the expanded staging area pad. From there it will either percolate back into the ground or be released into the stream system. Ultimately,after the mining stages,the pit will be reclaimed to be free-draining. The operations pad at the mouth of the pit will be higher than the pit floor, so a drainage trench will be excavated to allow the pit to drain. Please refer to details in Exhibit E and F. Additional Concerns—Security.Stormwater Control, and Weed Control Throughout the life of this operation, erosion and presence of noxious weeds will continue to be monitored on all disturbed areas and addressed in a timely manner. Please see the noxious weed control plan at the end of this exhibit. A storage or transfer area for fuel and lube will be designated either on the operations pad or the processing pad area. It is expected that most fluids will be delivered to the site on the day that it is needed,without the need for a storage area. Regardless,this designated area will include berms, liners and secondary containment structures. The operator will install and maintain adequate stormwater controls for all affected areas of the site, including the quarry and operations pad areas, roadways, above-quarry slopes,topsoil stockpiles,and overburden cell. These controls may include earthen dams,culverts, ditches or diversions,and wattles or silt fence, as appropriate. See the Exhibit C maps for locations of the stormwater controls. The site will be kept secure by a locked and gated entrance. The areas above the highwall will contain signage and/or physical barriers to deter accidental falls, conforming to MSHA requirements. Reclamation—Overburden and Topsoil Handling, Revegetation Native topsoil is present throughout most of the undisturbed portions of the expanded permit area; though depths vary,the operator expects to be able to salvage between a 3-and 6-inch depth of soil. Topsoil that is stripped prior to all disturbances will be placed in one of the following areas: windrowed at the margins of the various areas of mining activities; placed near the overburden stockpile area (for spreading); on the outslope of the expanded staging and product stockpile area; on the new sloped surface of the area above the expanded highwall; or simply placed in the topsoil stockpiles for later use in reclamation. Topsoil will be spread on reclaimed surfaces at a depth of 3 to 6 inches(except on the benches,as noted above). All areas where topsoil is placed, including the topsoil stockpiles,will be seeded with the approved revegetation seed mix at the approved rates.