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leveled. Test-pit locations will be reseeded in the spring. It should be noted that all minor surface disturbance <br /> associated with the site geotechnical investigations falls within the footprint of previous cultural resource survey <br /> completed and submitted for the 5MN Pipeline and future passive treatment system(MR15-288). <br /> Fresh-Water System Modification - TC's fresh-water system was modified to incorporate the million-gallon <br /> storage tank currently being used by Colorado Yampa Coal Company. A water-line was constructed which ties-in <br /> with the million-gallon tank, the existing well, and the new fresh-water borehole. The location of this system is <br /> shown on Map 24, Surface Facilities. <br /> Installation of the water-line required excavating a trench approximately 7 to 15 feet in depth. As shown on Map <br /> 24, Surface facilities, the majority of the ditch work occurred within previously disturbed areas. For the section of <br /> pipe laid in the disturbed area, a work corridor, approximately 30 feet wide, was used. The material excavated from <br /> the trench was placed adjacent to it, and after the pipe was placed the trench was backfilled. For the undisturbed <br /> area the topsoil, approximately 2 feet in depth, was removed from the work area, and temporarily stockpiled <br /> adjacent to it. After the trench was excavated, the water line placed, and the trench backfilled, the topsoil was <br /> replaced. <br /> A borehole, approximately 150 feet in depth, was drilled into the mine workings and cased. The borehole is <br /> approximately 12 inches in diameter, and the casing is a nominal 8"diameter. The annular space was grouted from <br /> the bottom to the top. The drill-pad required for this project was constructed on both disturbed and undisturbed <br /> lands. The portion constructed on undisturbed areas required salvaging approximately 24-inches of topsoil. The <br /> topsoil was temporarily stockpiled adjacent to the pad. Once the system was working, the topsoil was redistributed <br /> and seeded with the rangeland seed mixture. A temporary access road was constructed to the drill-site across an <br /> undisturbed area. Approximately 28 inches of topsoil was salvaged from the road corridor and temporarily <br /> windrowed to the side. After drilling and setting the casing the road was reclaimed by blading the topsoil back over <br /> the area, and the area seeded with the rangeland seed mixture. Any future access into the area will be along the <br /> existing railroad tracks. Given the limited amount of disturbance and rapid reclamation of the area it is requested <br /> that this area be identified as a Small Area Exemption. Therefore, no sediment control system will be installed. <br /> After the system is no longer needed, the borehole will be grouted from the bottom to the top. An Octo plug will be <br /> placed 10 feet below the surface, and the remainder of the hole will be backfilled with soil material. <br /> TR16-84 2.05-51 08/20/18 <br />