2008-01-11_PERMIT FILE - C1982056A (2)

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When the treatment facility is no longer needed it will be removed from the site. This will entail removal of the building, aerators, influent/pretreatment structure, and overflow structures. The remainder of the buried PVC will be ]eft in place. The concrete pad for the building will be broken up and placed in the bottom of the ponds. The ponds will be backfilled and regraded with the overburden material to approximate original contours. The site will be topsoiled and reseeded with the approved mixture. The waste water treatment facility is permitted through the Colorado Department of Public Health and Environment. The permitting process through the CDPHE required submittal of a site application. That application is presented in Exhibit 8-O, Waste Water Treatment Facility. Also, the approval received from the CDPHE is included in the Exhibit. TCC did not include any of the technical segments of the application in effort to conserve map paper. Comnressor Buildine (MR 03-183 An air compressor building was constructed in the alley between the light duty bay and the shop. The location of the building is shown on Map 24, Surface Facilities. The building houses air compressors, dryer and controls, exhaust and tool storage area. The building was constructed by placing a roof over the alley and enclosing the front of the alley with a wall and doors. A borehole, approximately 150 feet in depth, was drilled from the alley into the underground workings. An airline was installed in the borehole, which delivers compressed air to the underground equipment. The borehole was a nominal 10-inch boring and cased with a 6-inch diameter aluminum tubing. The tubing was grouted in place and connections made at the top and bottom for completing the airline. Tn May 2003, a second borehole is to be drilled in the same general azea as the first boring, for a similaz use. The location of the second boring is illustrated in Map 24. This boring will be 8-inch diameter, cased with 6-inch diameter steel piping. The piping will be grouted in place and connections made at the top and bottom for completing the airline. When the line(s) are no longer needed, the airline tubing will be grouted in place and the remainder of the facility removed from the site. The usable equipment will be salvaged for later use. Site 109 Diversion The diversion will consist of a 6 inch PVC PIP imgation pipe attached to the existing 109 riser. This line will be buried and will cross the existing berm immediately to the north of the 109 riser. From that point, the line will parallel the berm, crossing the roadway near the operations center at a depth of approximately 3 feet. Should ground conditions warrant it, an 8-inch diameter steel pipe will be installed to act as a protective sleeve for the PIP pipe where it crosses the road. The line will then be buried along the berm until reaching the east end of the heary- equipment pad, where the line will make a 45' turn to the north and pass under the PM Bay access road. Again, a protective steel pipe sleeve may be installed should conditions warrant it. From the PM Bay Road down to the existing Site 114 vertical culvert the line will be buried to a depth of 6-8 feet. At Site 114, the existing culvert, which has been backfilled with washed rock, will be utilized as an infiltration point, with the line entering the culvert at a depth of not less than 6 feet. Water will then infiltrate into the spoils and replenish the aquifer prior to being pumped from Site 114 to the million-gallon tank and thence undergound. Line location is shown on Map 24. In order to increase operational flexibility, the Site 109 Diversion may be plumbed directly into the line-feeding site 114. Therefore, when this option is exercised all the water from site 109 will be diverted to site 114. MR03-183 2.05-21 04/30/03