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2~1 Commodity <br /> The primaryoommoity is gypsum. There isnO secondary commodity. <br />� 2.2 Sco�� �f ��'�ena����8 <br /> ' <br />� The proposed mining activities would consist ofthe following: <br />� <br /> Road construction (Drawings� ` ' <br />� Remove of the� ,—_ ' <br />� accommodate the Upper Pit expanded footohnt, including constructing an interior pit <br />� road to access lower benches of the Upper Pit; <br />� Construct a new section of road from approximate elevation 6946 feet arnsl on the Upper <br />� Pit 6900 Access Road to an Upper Pit elevation of 6958 amsl feet. This would include <br />� demolishing the riprap collar on the 30-inch culvert inlet proposed as part of the Upper <br />� Pit 09OO Access Road (BLK4. 2019� CO [JRM8, 2019o)` installing new <br />� <br />� 230-foot long section of 30-inch Culvert where the proposed road fill crosses an existing <br /> drainage to create a continuous 30'inch culvert. The riprop apron at the culvert ouUe[ <br />� (BLW1. 2018; CO C)RMS. 2019a) would nannoin intact throughout the cu|vert'S <br /> operational life; <br />� <br /> Construct G new road through the partially reclaimed northern section of the Upper Pit; <br />� Construct a new road across the existing intraburden storage area and on native ground <br /> to the East Pit. This would include constructing e new 130-foot |ong 24-inchdiarn8ter <br />� culvert, /ipnap collar <br />� (in|et), and ripn]p apron (outlet) where the road fill crosses an <br /> existing drainage. Drawing 10 shows culvert details; <br />� Abandon, regrade, and reclaim as much of the original haul road and Upper Pit 6900 <br />� <br /> ACCeaS Road (BLK4, 2019; CO [>Fly@8. 20198) as p0SSib|8 throughout operations <br /> (although there will likely be e short period of time where all three roads would be in <br />� use at the same drne); and <br /> Throughout road construction and operation, fn||ovvinQ Best Management Practices <br /> (BMPs)for fill slopes tostabilize surface soils and reduce erosion potential. BMPamay <br /> include reveget8ting Or installing erosion protection rne8Sur8S(straw wattles, silt fence, <br /> hey bales). Appropriate erosion protection vvou|d be determined by conditions <br /> encountered during operations. <br /> Open pit mining activities (Drawings O0 through 0S): <br /> Expand the Upper Pit by approximately 117 acres outside the approved boundary from <br /> the 2002 permit (BLM. 2002; CO DFtMS, 2001). The nnaxirnurn pit footprint vvnu|d be <br /> excavated to a pit floor elevation of approximately 6760 feet amsI. If additional gypsum <br /> is present in the pit footprint and groundwater is not encountered (identified through <br /> additional drilling), interior benches would be constructed to bring the pit floor elevation <br /> to approximately 0500 feet ama}. Drilling permits (including drill hole plugging and <br /> reclamation) would be obtained prior to drilling and drill holes would be plugged <br /> 14 <br />