2023-09-20_BONDING - M1980047 - Laserfiche WebLink

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Colony Reclamation Cost Estimate, Update to Exhibit L Rev. Sept. 2023 La Sal Laydown Area, Area 16A Similar to the Plant Site, the 50 acres of the La Sal Laydown area would be re-graded in place with a dozer pushing the surface into a series of randomly located hummocks and depressions 5 to 10 feet in height. Much of the outermost edges of the north, east and south sides of this area are near-repose angle slopes 15 to 20 feet in height. These would be pulled back using a large backhoe to a flatter slope capable of retaining a topsoil cover. The area would then be covered with 6 to 12 inches topsoil from the Ridgetop Stockpile (Area 12). It would then be revegetated with the same seed mixes described above for the Plant Site. As described above for the Plant Site, the possibility of leaving this area in its current condition might also be considered, retaining only the requirement to pull back some of the outer slopes to flatter slopes, However, this is not being proposed at this time. The reclamation of the LaSal Laydown Area is as described above and as laid out in the 1980 permit application. Construction Water Pipeline, Area 16B In the Exxon's 2006 application for a partial area reduction, these 8 acres of disturbance for a buried water line were considered by Colony to be in its final form. This buried steel pipe (12") was installed to convey water form Colony's adjudicated water wells in Upper Davis Gulch up to a planned ready-mix plant located in the La Sal Laydown area. The disturbance was minor, and topsoil was replaced and seed spread over the pipe immediately upon construction in 1981. It has since become vegetated to the extent that the surface is now covered with a dense grass and forb mix. CDRMS advised in 2007 that if the line was "abandoned" it could indeed be considered complete reclamation. However, abandoning would require backfilling with concrete at both ends. Since the pipeline may yet be used, Colony elected to leave the pipeline available for service and did not abandon it in place. Howeverjo do so would require no additional cost other than a few cubic yards of concrete. Accordingly, there is thus no tabulated cost required to abandon this area. Coarse Ore Gulch, Area 17A This 71 acre area includes 56 acres of area disturbance that require reclamation work (Area 17A) and 15 acres of small disturbances (Area 176) that have been deemed complete and released in the 2007 Area Reduction Plan. This 71 acre area includes 56 acres of area disturbance that require reclamation work (Area 17A), 5 acres of Surface Conveyor Disturbance (Area 17C) that were deemed complete and released in the 2007 Partial Acreage Release AR-01, and 5 acres in small disturbances (Area 1713) are still considered active (construction water pipeline route and disturbance for the proposed Guard Pond). (Refer to Figure L-1). Even though the surface disturbance of these 5 acres was limited to stripping vegetation in 1982, and both areas are probably acceptable as-is for release, they have been retained active for the same reason the other leg of the Construction Water Pipeline (Area 166) has been retained as active. That is because the construction water pipeline will likely be of use during reclamation work, and therefore will not be permanently abandoned (concrete backfilled at ends) until reclamation is complete. It is not judged worth the effort to separate this portion of the active 5 acres form the portion that is in effect complete. A Page 11