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Processing: <br />The majority of material mined under this proposed application will be processed on-site. A <br />small amount of material near the end of the mining phase of the project may be processed off- <br />site orsold as pit-run material. <br />Imported Material: <br />E-470 Public Highway Authority may import material from other sites to the Sandy Acres site. <br />In particular, topsoil for the support of revegetation may be imported depending on the quantity <br />of overburden material on-site. This material is expected to be imported as mining and <br />compacted clay liner construction is concluding. <br />The applicant is aware that in accordance with Rule 3.1.5(9) of the Construction Material Rules <br />and Regulations, if any offsite material is used as backfill, a notarized letter will be submitted to <br />the Division indicating the materials are inert. The applicant will supply such a letter to the <br />Division if, at the time of Reclamation, the applicant intends to use off-site material as backfill. <br />(b) Earthmoving; <br />Topsoil and overburden will be stripped with scrapers or bulldozers and stockpiled in <br />segregated piles at the top edge of the mine area. Excavators, front-end loaders, and <br />bulldozers will be used to mine and stockpile the saleable material along the western <br />processing bench area. In the final stage of mining, stockpiles will be located on the mine <br />floor. Conveyor belts or haul trucks will be utilized to transport the raw material from the active <br />mine area to the on-site processing area. <br />The site will be mined at a 1 H:1 V slope (the highwall). The claystone bedrock will be <br />excavated at a slope of 6H:1 V twenty feet inside of where the compacted clay liner (CCL) <br />meets bedrock. The excavated claystone will be ripped and moisture conditioned before <br />placement against the highwall to create the CCL. <br />(c) All water diversions and impoundments; and <br />A dewatering trench will be installed around an area prior to mining. This trench will intercept <br />surrounding groundwater flowing into the pit area and will drain the existing pond water above <br />the invert elevation of the trench. As the localized water surfaces drop and mining continues, <br />the trenching will be reconstructed lower multiple times until reaching bedrock. Dewatering will <br />be continuous until the entire CCL is constructed. The Operator will obtain the necessary <br />discharge permit from the Colorado Department of Public Health and Environment -Water <br />Quality Control Division prior to dewatering the pond or discharging any other water from the <br />site. <br />(dJ The size of area(s) to be worked at any one time. <br />The maximum area to be worked on at any one time is approximately 58.8 acres. <br />E-470 Public Highway Authority -Henderson Development (Sandy Acres) - MLRB 112 Permit Amendment Application <br />Exhibit D - 4 <br />