2008-02-22_APPLICATION CORRESPONDENCE - C2008086 (46)

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CHAPTERTWO Alternatives Table 2-12 MINE STRUCTURES Item Number Shifts/Day Hours/Day Horsepower Laborers 50 1 500 N/A Supervisor/Pickup 3 1 30 N/A Notes: *For each piece of equipment. N/A = not applicable Construction Impacts -Avoidance and Mitigation All gravel roads would be watered or treated with a surface surfactant to control potential fugitive air emissions. Water for dust suppression and compaction would be obtained from Mack Wash. A temporary pipeline would be installed along the rail route to provide necessary water for construction activities. Conveyor transfer points would be partially enclosed, and water sprays would be utilized. Stacking tubes would be utilized to reduce the drop height of the coal. Coal stockpiles would be watered as necessary to minimize fugitive dust. Surface water runoff from the majority of the area, including all of the mine facilities and the rail loadout loop but not including the rail line, would be collected in sediment ponds. Sediment ponds are designed to provide adequate capacity to contain or treat the runoff or inflow entering the pond as a result of a 10-year, 24-hour precipitation event and any additional storage resulting from inflow from the underground mine. Sediment ponds and diversion and collection ditches would be constructed on and off the coal lease boundary. A sediment pond would be required near the coal wash plant, unit train loadout, and coal mine waste disposal area. Ditches would be designed to direct disturbed area runoff to the sediment ponds and, in some cases, divert undisturbed area runoff away from the sediment ponds. Sediment ponds and ditches would be constructed on the coal lease boundary to collect and treat disturbed area runoff. Surface runoff not collected in a sediment pond would be filtered through a sediment trap such as a silt fence or straw bales. Mine water discharge (groundwater) may mix with surface water. Surface infiltration around coal stockpiles or coal mine waste disposal areas may allow mixing of surface and groundwater. CAM will be required to obtain a Storm Water Discharge Permit and a National Pollutant Discharge Elimination System (NPDES) permit from the State of Colorado (see Table 1-1, List of Permits and Approvals). The time of year that construction would commence depends upon obtaining BLM land use and ROW permits, along with other state and federal permits. To estimate the required labor force necessary for the project, construction was broken down into two phases. The first phase includes the heavy earthwork-moving phase; the second phase includes the structure and installation. Phase I requires approximately 90 employees, and Phase II requires approximately 100 employees. There would be some overlap between the two phases, so it is estimated there would be up to 150 employees working on the project at any one time. Phase I is estimated to take approximately six months; Phase II would require nine months, for an estimated total construction time of 12 to 15 months. 2-54