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A portable asphalt plant will be in the southeastern corner of the site. Material crushed and <br /> stockpiled on site will be used for asphalt production. Asphalt production may occur only <br /> during the warm season months of April through November. Components associated with the <br /> portable asphalt plant include: <br /> - Liquid asphalt storage <br /> - Aggregate feed bins <br /> - Mixer <br /> - Conveyors <br /> - Lime silo <br /> - Truck loading equipment <br /> - Power supply and distribution <br /> All fuel tanks will have secondary containment. Tanks will be either double walled or located <br /> within bermed or lined areas that have over 110% of the volume of the largest stored tank. Fuel <br /> tanks will be in the processing area; see the Mining Map. Several hazardous materials will be <br /> stored and used onsite throughout the project. These materials include products that are <br /> associated with diesel motors and products associated with asphalt production. <br /> Unimproved on-site roads are temporary and will change as mining progresses to the east. <br /> Support equipment will come to the site on an as-needed basis. Night mining activity may occur <br /> in the operation and portable lighting may be used within the pit from time to time. Portable <br /> toilets will be used for employees. All mining structures on site are shown on the Mining Map. <br /> Stormwater drainage on the onsite disturbed areas will be managed to direct all stormwater to the <br /> active working area by berms and ditches that border all disturbed areas of the site. No formal <br /> sediment settling pond or sump will be located on site; however, the nature of mining leads to a <br /> depressed mined basin surrounded by site perimeter and pit specific isolation berms. Therefore, <br /> no stormwater or process water will leave the site and all runoff from a 100 year 24-hour rain <br /> event will be trapped on site and waters will infiltrate the pit floor within 72 hours. Onsite <br /> drainages will not be directed off any highwall into the pit. Excepting the highwall, slopes in the <br /> area of drainages will be maintained at or shallower than 3H:IV. As no stormwater will leave or <br /> is anticipated to leave the site, a CDPHE Storm Water Discharge permit is not required. <br />