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Colony Reclamation Cost Estimate, Update to Exhibit L Rev. Sept. 2023 <br /> Although the main access road, including gravel surface and the cut and fill side slopes, <br /> was released from further reclamation liability in the 2007 Partial Acreage Release AR- <br /> 01, there is a 3 acre sliver adjacent to and immediately west of the lower valley road in <br /> Area 19A that is occupied by an active power line and associated wooden poles. This <br /> power line provides electrical power to the site's mechanical shop building, and it needs <br /> to remain in service at least until all reclamation work is complete. Its final grading and <br /> revegetation condition were deemed suitable for release by CDRMS staff during their <br /> 2007 inspection, but the fact that this power line needs to remain in service prevents the <br /> 3 acres in its footprint from being released. Funds are therefore provided in the <br /> reclamation cost estimate to remove this power line. <br /> Post 1982 Interim Site Plan (ISP)Affected Areas <br /> Two small areas were disturbed after the 1982 Interim Site Plan and thus have no <br /> numerical designation in the tables or maps, but are nevertheless included in the total <br /> affected acreage tally. The first is the 3 acre ESR (Exxon Shale Retort) revegetation <br /> research plots constructed in 1987 in the valley just south of Plant Site Area 18C. This <br /> activity demonstrates the successful revegetation of a topsoil cover over fluid bed <br /> combusted spent shale from Exxon's 1984 proprietary retorting process, using the <br /> nominal topsoil thicknesses planned for the Tosco process spent shale. Although thirty <br /> years of the sophisticated moisture penetration measurements have been completed, <br /> the plots remain a valuable asset for anyone interested in long term performance of <br /> evapo-transpirative soil covers at a semi-arid site. The operator may wish to offer them <br /> as an agronomical study area to a local university. Accordingly there are no plans or <br /> funds to reclaim these plots in this bond estimate, although they could be deemed <br /> reclaimed in their current condition with no additional site work. <br /> The other post-ISP disturbance is a small 1 acre alternate access road at the southern <br /> property line whose construction was necessitated due to pipeline construction activity <br /> by others on the hillside that had the potential for rolling boulders down onto Colony's <br /> main access road entry gate. Funds are included to topsoil and revegetate that 1 acre <br /> disturbance. <br /> Page 13 <br />