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2019 Plan of Operations Modification American Gypsum Company, LLC <br /> RMP Resource Management Plan <br /> SM Survey Monuments <br /> SPCC Spill Prevention Control and Countermeasure <br /> SWR Soil and Water Resources <br /> Tierra Group Tierra Group International, Ltd. <br /> TR Technical Revision <br /> USACE United States Army Corps of Engineers <br /> USCB United States Census Bureau <br /> USDA United States Department of Agriculture <br /> LIST OF UNITS <br /> kw kilowatt <br /> Ib/ac pound per acre <br /> mph miles per hour <br /> pcf pounds per cubic foot <br /> tpy tons per year <br /> % percent <br /> EXPLANATION OF TERMS <br /> Growth Medium Inert material capable of supporting vegetation <br /> Intraburden Inert, non-economic material encountered during open pit mining <br /> operations <br /> Overburden Inert, non-economic material encountered prior to reaching mineable <br /> gypsum <br /> Proposed Permit 99.2-acre area within unpatented mining claims <br /> Expansion Area <br /> Proposed Proposed new disturbance areas for infrastructure such as pits and <br /> Disturbance Area roads <br /> Am Gypsum Poo Mod ISSD 20190909 September 2019 (vi] <br />