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Mr. Oswald/M -1982- 090 /TR -04 <br />September 10, 2012 <br />Page 4 of 6 <br />of how this is planned to be constructed in the field. The pond displayed with modeled contours in <br />Figure 2 meets the slope criteria for a reclaimed pond (see Section 6.0 of the original TR submittal). <br />DRMS: The equipment storage building will house equipment and supplies for this proposed <br />project, and will also house fuel and other fluids. Please state whether the building will have a <br />concrete floor (or other impermeable material), and what type of impermeable secondary <br />containment will be provided for the fluids and hydrocarbons that will be stored onsite. <br />CBCI: CBCI will construct a 30 foot by 30 foot by 8 inch concrete slab inside the storage building. <br />The remaining portions of the building floor are anticipated to consist of the ground surface that is <br />exposed after the cap material is stripped. The non - concrete surface will be compacted and filled <br />with surrounding materials as needed to make the floor level and usable. The slab will be designated <br />as the area to store fuels, lubricants, and other fluids necessary for the mechanized equipment shown <br />on the equipment lists. All fluids for mechanized equipment not contained in approved mobile <br />storage tanks will be equipped with secondary containment with the capacity to hold at least 150% of <br />the volume of the stored fluids. An example of secondary containment to be used is a series of <br />shelves holding oils, grease, hydraulic fluid, drilling oil, antifreeze, etc. that are all situated above and <br />inside a low lying galvanized stock tank which will capture any incidental spills. Diesel fuel and <br />gasoline will be stored in approved mobile fuel storage tanks mounted in the bed of passenger <br />vehicles that collectively will not exceed 500 gallons. While on site and immobile, vehicles <br />equipped with approved mobile fuel storage tanks will be parked on the slab in the equipment storage <br />building, when practicable. At all times, spill prevention measures will be kept on site for use in case <br />of any incidental releases. These measures include sorbent towels for any spills and a minimum of <br />ten empty 55- gallon drums for disposal. The slab will also have a designated area for equipment <br />maintenance that involves changing or maintaining fluids. Waste oils and other waste fluids will be <br />disposed of off -site at an approved disposal facility. All other fuels and lubricants on site will be <br />retained in the mine vehicles and equipment, thereby limiting any significant spill opportunities. In <br />the event that extended down time is necessary and operations are inactive for a period of more than <br />45 consecutive days, all stored fuels will be removed off -site. <br />DRMS: The description of the pipe support spanning Imogene Creek is not sufficient. The <br />drawing appears to be a plan (top) view, but a side view is needed also. Please provide <br />information about the concrete foundations supporting the ends, including materials and <br />drawings (from top and side). Details regarding anchoring of the span to the foundations and <br />securing the pipe to the span are also needed. <br />CBCI: CBCI engaged Wilson Structural Engineering of Durango, Colorado to design the pipe <br />crossing of Imogene Creek. Sheets S1 and S2 provide detailed drawings and specifications for the <br />footers, steel beams, and fasteners that will support and secure the pipe. Each concrete footer will be <br />suspended on 4, 4 inch micropiles that will be drilled and grouted a minimum of 15 feet below the <br />creek bottom. The concrete footers will be 5 feet thick, 2 feet deep, and a maximum of 8 feet wide <br />(depending on the distance the girders are apart). Resting on the concrete footers will be 2, W24x62 <br />steel girders (maximum of 60 feet long) that span the creek crossing. Every 5 feet along the span of <br />#xk <br />