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2019 Plan of Operations Modification American Gypsum Company, LLC <br /> 6.13.2 Approach/Procedure for Characterization <br /> During active mining,the rotomill grinds layers of gypsum and intraburden in approximately 6-inch <br /> layers. Intraburden is typically intermixed with gypsum, clearly identified by the distinct color <br /> variation. Gypsum is white in color while intraburden is a darker tan/brown color. Equipment <br /> operators (reporting to the Mine Superintendent) are responsible for segregating materials into <br /> separate stockpiles within the active pit, which are loaded and hauled to American Gypsum's <br /> wallboard plant (gypsum) or used for progressive reclamation, access road construction, or <br /> stockpiled within inactive portions of the Lower Pit, Upper Pit, and East Pit for final reclamation <br /> (intraburden/overburden). <br /> 6.13.3 Waste Rock (Intraburden/Overburden) Management Plan <br /> Overburden is defined as material above the East Pit gypsum with little to no gypsum content, <br /> ranging in depth from 0 feet to 82 feet (using drilling data). Overburden would be removed during <br /> pre-production prior to active mining in the East Pit only. Intraburden is defined as inert, non- <br /> economic material to be removed during the East Pit and Upper Pit progression. <br /> 6.14 Quality Assurance Plan for Proposed Activities <br /> A Quality Assurance Plan (QAP) is included as Appendix C.The QAP covers activities associated <br /> with culvert installation (including bedding, backfilling, and erosion controls) and road <br /> construction. <br /> 6.15 Spill Contingency Plan <br /> Gypsum is processed into wallboard directly at the plant; there are no on-site processing facilities <br /> and therefore no processing chemicals or acid-producing materials used or stored at the Mine. <br /> During operations, care would be taken to ensure that no oil, fuel, or lubricants are discharged <br /> onto the ground. Any spills or discharges would immediately be reported to the BLM, followed by <br /> prompt cleanup and remediation. Spills would be reported and managed according to American <br /> Gypsum's SPCC Plan (Environmental Solutions, 2019). <br /> 6.16 Monitoring and Inspections <br /> Monitoring (surface and groundwater quality and quantity, air quality, revegetation, stability, noise <br /> levels, etc.) would be conducted as required by existing approvals. Revegetation monitoring is <br /> discussed in Section 7.7. <br /> Throughout operation, American Gypsum would perform additional inspections according to <br /> Table 6.7. <br /> Am Gypsum Poo Mod ISSD 20190909 September 2019 [321 <br />