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The emphasis of the stormwater management plan is in two parts. First, is the diversion of run-on <br /> from the NFS land to the west away from the quarry pit walls. This is accomplished by grading <br /> the existing roads at the crest of the quarry so that water is collected and conveyed to the north <br /> or south. Diverting this water away from the quarry walls will limit flows and seeps into the fracture <br /> zone. Second, is preventing heavy sediment and stormwater flows from leaving the site. This <br /> is accomplished by maintaining, as much as possible, "informal" detention basins within the <br /> mine. These are "informal" in that they are composed of mine pits and other depressions <br /> that simply capture stormwater and sediment and prevent it from entering the lower portions of <br /> the permit where the more "formal' controls identified in TR-7 (1994) are present. The <br /> "depression" in the pit is expected to last throughout the mining and reclamation grading phase <br /> and will be the last area graded. <br /> The "formal" stormwater controls include the use of culverts to direct the water and sediment <br /> to a series of detention basins that capture the sediment and allow much cleaner water to pass <br /> through. Open drainage paths will be protected primarily with drop structures that act as energy <br /> dissipaters, minor sediment collection areas, and streambank protections. <br /> A final detention basin near the east edge 'of the permit that was constructed before <br /> May 27, 1994, provides a final treatment area. This basin was included in the stormwater <br /> management facilities technical revision submitted in January 1994. This allows for capture of <br /> any sediment that bypasses the upper sediment basins and drop structures. <br /> Near conclusion of the reclamation construction,the quarry depression will no longer be available <br /> for sediment control. Runoff will be routed to the northeast through the sediment pond, when <br /> practical, and best management practices will limit offsite sedimentation in other locations. <br /> Discharge and sediment volumes should not be greater than current volumes and will probably <br /> be much less. This is because nearly all the land at the end of the reclamation will be <br /> revegetated. At present, most of the sediment that needs to be controlled comes not from <br /> revegetated areas, but from nonvegetated roads, mining, and processing areas. This sediment <br /> control will be managed using the existing facilities near and after the end of reclamation. <br /> Long-term, small depressions along the eastern boundary of the mine will be utilized to increase <br /> sedimentation and slow runoff release from the areas. It is anticipated that these areas of <br /> dense vegetation on nearly level ground will be very effective at removing sediment. These <br /> facilities are presently operational and also function as sediment control facilities. None of the <br /> structures will be removed upon reclamation but will become part of the reclamation and will be <br /> largely obscured by vegetative growth. <br /> Reclamation Drainage Plan <br /> Pikeview Quarry Amendment 4 <br /> 2019 <br /> G-3 <br />