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Colony Reclamation Cost Estimate, Update to Exhibit L Rev. Sept. 2023 <br /> crimped-in straw mulch for large area reclamation is rarely practiced today. It has largely been <br /> supplanted by use of stubble mulch seeded and mowed several months prior to the main <br /> seeding effort or use of an annual grass nurse crop included within the main seeding effort. <br /> Similarly, establishing shrubs from seed as opposed to planting seedling stock is now common <br /> practice in mine reclamation, and has been successfully implemented at Colony in the early <br /> 1980s. Both of these techniques produce more effective results at a lower cost. Thus, while this <br /> estimate is likely to be somewhat liberal (i.e., overestimate) on these aspects of the reclamation <br /> work, the newer more economical techniques can be included if desired via a technical revision <br /> prior to commencement of any major permanent reclamation effort at the site. <br /> Area by Area Reclamation Plan Details <br /> Lower Valley Access Road, Colony Gate to Office Buildings, Area 4 <br /> The access road surface and side slopes were released in the 2007 Partial Acreage <br /> Release AR-01, but there remain 5 acres of active areas including a lab/office building, <br /> two storage buildings, fuel tanks and three small sediment ponds. Funds are included to <br /> demolish the buildings and remove the fuel tanks and sediment ponds. Concrete slabs <br /> and foundations will not be removed but rather will be buried with 2 feet of soil as <br /> described on page E-52 of the 1980 permit application for foundations at the Plant Site. <br /> Earthwork costs include regrading in-place these areas and the small sediment ponds, <br /> hauling topsoil down from the plateau topsoil stockpiles, and revegetating the reclaimed <br /> area. <br /> Colony's need for future road and dam maintenance suggest that these facilities should <br /> be allowed to remain in place. However, the assumption made for this reclamation <br /> estimate is that they will be removed. If retaining these facilities in service is to be the <br /> ultimate plan, a permit revision can be prepared at some future date. <br /> Lower Valley Access Road, Area 5A <br /> Similar to Area 4 above, the access road and its side slopes were released in the 2007 <br /> Partial Acreage Release AR-01. There remain 3 acres of active affected land including <br /> the sites of the mechanical shops and an equipment warehouse. As in Area 4 above, <br /> funds are provided in the estimate to demolish the buildings, using the same steps as <br /> described above for Area 4. <br /> As described above, Colony's need for future road and dam maintenance suggest that <br /> these facilities should be allowed to remain in place. However, the assumption made for <br /> this reclamation estimate is that they will be removed. If retaining these facilities in <br /> service is to be the ultimate plan, a permit revision can be prepared at some future date <br /> Mine Bench, Areas 6A and 6B <br /> This area consists of a 4 acre roadway (A-Groove Road, Area 6A) on a rock bench in <br /> the canyon wall just west of the flat lying 27 acres of the Mine Bench (Area 6B). <br /> The 4 acre A-Groove Road area was originally an access road from the middle of the <br /> Mine Bench southerly about 0.4 miles to the site of the planned mine vent portals. <br /> Because it is cut in rock, it is considered in its final landform similar to the rock-benched <br /> canyon walls on either side of the Mine Bench. However, it has been retained as an <br /> active affected area for possible use related to shale research. Since there is no site <br /> Page 6 <br />