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Table D -2 Ralston Quarry Mining Timetable <br />Steps <br />Stage of Operation <br />Length of time to <br />complete (years) <br />1 <br />Mining of north platform area above water tunnel <br />3 <br />2 <br />Mining of reservoir area below water tunnel <br />15 -20 <br />3 <br />lReclarnation of processing and stockpiling area <br />1.00 <br />Total <br />19 -24 <br />Evident from the table above, the mining of the Ralston Quarry can be roughly divided into two <br />stages. The first is the mining of the north platform area above the Denver Water tunnel. This <br />area will not be part of the larger reservoir area, and therefore will be backfilled, topsoiled, and <br />revegetated. The second stage is the mining of the remaining internal area of the quarry. This <br />will be the location of the water reservoir, and therefore will not be backfilled. <br />3. Mine Facilities and Operation <br />The crushing and screening will take place within the processing area in the southwest corner of <br />the site. Fuel will be brought on site by fuel truck, and on site storage will be maintained at a fuel <br />farm. This fuel farm will be constructed to have secondary containment of 110% capacity of all <br />tanks stored within. The fuel tanks for all fixed plants will be stored at this fuel farm. Other <br />individual pieces of equipment that are of a more mobile type will carry their own fuel tanks, and <br />will have secondary capacity of 110% as well. An SPCC Plan will be placed in the mine office <br />and the employees will be trained to take the appropriate steps for inspections and spill response. <br />Portable plants and equipment are covered under their own portable plant SPCC Plans. If any <br />fuel spill is encountered, the material will be removed from the site. The Division will be notified <br />in the case of any spill. Upon final reclamation, all equipment will be removed from the site. <br />The asphalt plant consists of burner fuel tanks, asphalt cement tanks, mixer drum, storage silos, <br />loading hopper and a control room. Asphalt processing operations will only be conducted in the <br />warmer months as the placement of asphalt is weather and temperature dependent. <br />Ralston Quarry, February 2015 D -3 <br />