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All fuel tanks will have secondary containment. Some are double walled, others will be located <br /> within bermed or lined areas that have over 110% of the volume of the largest stored tank. Fuel <br /> tanks can be found in the northern extent of the currently permitted site on the pit floor; See Map <br /> C-1. Several hazardous materials will be stored and used onsite throughout the project. These <br /> materials include products which are associated with diesel motors, and products associated with <br /> asphalt and concrete production. <br /> No night mining activity is scheduled for the operation; however portable lighting may be used <br /> within the pit from time to time. Portable lights will only be used at the bottom of the pit for the <br /> purpose of after hour equipment maintenance activities within the permitted hours in the winter <br /> months while the days are shorter. Portable toilets will be used for employees. All mining <br /> structures on site are shown on Map C-1. <br /> Existing barbed wire fences border the northern and southern most borders of the site; warning <br /> signs will be posted no further than 100 feet apart. A six foot tall fence borders the permit edge <br /> of active excavation where the pit floor depth is greater than 10 feet and slopes are steeper than <br /> 3H:1 V relative to unmined topography. Where mining produces shallower than 3H:1 V slopes, <br /> no fence is required and will not be utilized. The operator commits to clearly marking the permit <br /> boundary. Speed limits and other traffic control signs can be found throughout the site and <br /> around the operation area. No problems are expected with vandalism. <br /> The site will use all existing roads to haul the product to its final destination. Colorado State <br /> Highway 150—Los Caminos Antiguos Road services the site and is accessed from U.S. <br /> Highway 160 to the south. Both roads are paved with gravel shoulders and no sidewalks. Peak <br /> months of haulage are May through September. <br /> No formal sediment settling pond or sump is located within the King Pit site; however, the nature <br /> of mining leads to a depressed mined basin surrounded by site perimeter and pit specific <br /> isolation berms. Therefore, no stormwater or process water will leave the site and all runoff <br /> from a 100 year 24-hour rain event will be trapped on site and waters will infiltrate the pit floor <br /> within 72 hours. Major and minor temporary drainages from the San De Christos Mountains <br /> infiltrates into the San Luis valley along the west side of the mountains and replenishes <br /> underground aquifers. Drainages will be diverted around the highwall either through drainage <br /> King Pit Xc.e�t cwicki aad As wriatra YI!C' <br /> February 2018 D-5 <br />