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Bureau of Land Management Environmental Assessment <br /> Royal Gorge Field Office DOI-BLM-CO-F020-2020-0036 EA <br /> Adequate stormwater controls that are currently emplace or would be installed are the following: <br /> drainage channel/swale, culverts,berms, and sediment ponds. The drainage channel/swale would <br /> be located along the high side of the access road consisting of a trapezoidal cross-section design, <br /> measuring approximately 2 foot across the bottom with a depth of 1 foot and 1.5 :1.0 maximum <br /> side-slope. Corrugated and galvanized culverts would be installed along the access road to divert <br /> runoff toward the drainage swale. The culverts would be at least 1 foot or greater in diameter, of <br /> sufficient length and depth beneath the access road, and angled to provide positive drainage. <br /> Stormwater berms would be constructed of overburden earthen materials sourced onsite and <br /> would be emplaced for the life of mine to divert runoff from the active quarry. Berm dimensions <br /> would be 3 to 4 feet high with 2:1 side-slopes and capped with topsoil and revegetated with a <br /> native seed mixture. Approximately, 500 linear feet (U) of newly constructed stormwater berms <br /> are predicted to be installed over the life of the quarry expansion if it moves forward. <br /> The mine entrance is currently located on the southwestern boundary of the quarry and is not <br /> anticipated to change if the quarry expands. Existing haul roads are used to access areas to strip <br /> topsoil and overburden, haul raw material to the processing area and haul processed material to <br /> the storage pad. Any newly constructed haul roads would be within the expansion footprint and <br /> primarily used to haul topsoil and overburden during the site preparation phase of the expansion. <br /> The operator would use the existing haul roads as much as possible. MSHA does not require a <br /> berm for the existing haul roads however, if MSHA requires any designated haul roads to be <br /> bermed in the future,the operator would comply with all regulations accordingly. <br /> PERMITS <br /> The operator would acquire all necessary permits, variances, easements, etc. required to operate <br /> within the proposed operational boundary. The following list summarizes the major permits <br /> already in place,required to be amended, or new authorizations that could be needed,upon BLM <br /> issuing a mineral materials contract to Colorado Quarries Inc., Black Obsidian Quarry: <br /> • Colorado Division of Reclamation, Mining and Safety(CDRMS)—Construction Material <br /> Permit 112(c) <br /> • COG5000000 (Sand and gravel mining process water and stormwater combined)— <br /> Colorado Department of Public Health and Environment (CDPHE),Water Quality <br /> Control Division(WQCD) <br /> • Air Pollution Emission Notice(APEN)—CDPHE, Air Quality Control Division <br /> • Substitute Water Supply Plan(SWSP)—Colorado Division Water Resources (DWR) <br /> • Mining, Safety and Health Administration(MSHA) <br /> • Custer County—special use permit <br /> 13 <br />