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Sand and gravel mining will be occurring in phases where construction aggregates will be <br /> produced and sold. The activities associated with the sand and gravel mining that could impact <br /> storm water runoff will include site clearing, topsoil removal, excavation of overburden, removal <br /> of sand, gravel, production of construction aggregates, and refueling and lubricating of <br /> equipment. As phases of the mining are completed they will be reclaimed, and at the time when <br /> the mining is completed for all phases the pit will have been reclaimed as a water storage <br /> reservoir. <br /> The pit is configured in 17 phases of mining with additional areas for processing and product <br /> storage/loading. To date Phases 1 through 4 have been mined and reclaimed. Phases 8,9,11, <br /> and 12 are being actively mined. A wash plant and stockpile area is located west of Phase 12. <br /> This area contains stockpiles for pea gravel and fines. The wash plant discharges to 2 sediment <br /> settling ponds that are located in the northeast corner of the wash plant area. These ponds <br /> discharge to the east, through pipes and ditches through phases 12 and 11, to a series of 3 <br /> sediment/dewatering ponds located on the pit floor along the east borders of Phases 11 and 8. <br /> Note that these 3 ponds treat the combined wash plant discharge and pit stormwater runoff. The <br /> water is then pumped from the northernmost of these ponds to a ditch which runs to the east <br /> along the borders of Phases 6 and 7, where it discharges to another set of sediment settling <br /> ponds located in the southwest corner of Phase 6. After the sediment has settled in these <br /> ponds, clean water is then discharged from the easternmost of the ponds to a ditch which runs <br /> to the north. This ditch outfalls into an existing farm ditch. This point is Discharge Point 001. <br /> Discharged flows then follow the existing farm ditch to the east, and then north to the Arkansas <br /> River. <br /> All stormwater from the wash plant area runs to the northeast and is discharged along with the <br /> wash plant discharge through a pipe under the plant road to a ditch in phase 12 on the east side <br /> of the plant road. <br /> A berm is adjacent to the west side of the pit access road that runs along the west side of <br /> Phases 1, 3, 9, and 12. This berm directs all stormwater flows from the road to a stormwater <br /> collection pond at the northwest corner of Phase 1 that has been constructed to collect <br /> stormwater from the pit access road. This pond allows sediment to settle from the stormwater <br /> before it is discharged to the northwest corner of the water storage reservoir in Phases 1 <br /> through 4, with no offsite stormwater discharges occurring. <br /> Rock and sand products are stockpiled in Phases 9 and 12. Crushing and screening facilities <br /> are located in Phase 9. All stormwater in Phases 8,9,11, and 12 flows into the actively mined <br /> area, and is being collected/treated in 3 sediment/dewatering ponds on the pit floor along the <br /> east borders of Phases 11 and 8. <br /> Sand Stockpiles are located in Phase 17, overburden stockpiles are located in the area south of <br /> Phase 17, and topsoil stockpiles are located in Phase 15. Stormwater from these areas flows <br /> along the historic drainage pattern to the northeast into the undisturbed Phase 13 area and <br /> infiltrates into the ground with no offsite discharge. On the south side of the overburden and <br /> topsoil stockpiles a berm has been constructed that directs flows to the east and west along the <br /> permit boundary, and then to the north around the stockpile, ultimately draining to the Phase 13 <br /> area. No discharges to Discharge Point 002 will occur. <br /> The area west of Phase 17 is planned to have a conveyor installed in it that will run from north <br /> to south from the wash plant area to the parcel south of County Road HH.5. Stormwater sheet <br /> flows to the east in this area and collects adjacent to the pit access road where it infiltrates into <br /> the ground with no offsite discharge. <br /> The parcel south of County Road HH.5 will be used as a finished product stockpile/staging area, <br /> and product loadout area. A BNSF railroad spur is located adjacent to the south boundary of <br /> 2 <br />