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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 /> Existing 4-strand barbed wire fences border the southern border of the site. Fencing will be <br /> installed clearly segregating the mining area from the remainder of the parcel which is used for <br /> cattle grazing. The Operator commits to clearly marking the permit boundary on all sides. <br /> Speed limits and other traffic control signs will be found throughout the site and around the <br /> operation area. No problems are expected with vandalism. <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 /> 4. Topsoil and Overburden Handling <br /> Topsoil will be salvaged from the mined area and placed in temporary perimeter berms <br /> surrounding the disturbed area. Piles are shown at the perimeter of the permit boundary on the <br /> Mining Map, the maximum disturbance limit. Topsoil stockpiles will be created by stripping the <br /> minimum required disturbed area as required by each year's mining. If additional area is <br /> required to be disturbed, the pile will be pushed or moved further out to the new perimeter of the <br /> disturbed area. Topsoil is expected to range from 0-6 inches. Topsoil will be stockpiled first in <br /> the western and northwestern extent of the site and the berm will build to the east as mining <br /> progresses as shown on the Mining Map. The topsoil berm will be used during reclamation, will <br /> be constructed to 21-1:1 V slopes or shallower, and will be seeded within 180 days of pile <br /> establishment with native rangeland grasses to stabilize the topsoil stockpile until reclamation is <br /> in process. <br />