2022-05-11_REVISION - M1979089 (2)

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Reclamation Costs Exhibit L Reclamation of the 23 Road Pit consists of converting the various pits into five groundwater lakes and revegetating the disturbed area to rangeland. The pit on the Precast Concepts property is going to be completely backfilled as part of Precast's use of their property as industrial. Additionally, cottonwood trees or other vegetation will be established on the west edge of the site as described in TR-07. Reclamation has been ongoing with mining and is partially completed; one pond has been fully reclaimed, various portions of the remaining pond slopes have been reclaimed, and some of the disturbances outside of the pits have been reclaimed. The worst-case reclamation scenario which will determine the bond cost is based on the current conditions of the site and various limits defined in previous revisions regarding disturbance limits. The current conditions of the site are shown in Figure 1. This figure identifies each pond and their current reclamation state. A previous permit amendment, AM-03, limits the maximum disturbance outside of the pits to 25 acres, which would be the maximum area that would require reclamation outside of the reclaimed ponds. This maximum disturbance which is made up of the processing and operating areas would require grading, topsoiling to 6 inches, and revegetation as rangeland. Currently, the disturbances outside of the pits are approximately 22 acres. Additionally, all equipment and structures would need to be removed from the site. The cottonwood tree plantings as described in TR-07 have not been completed as of April 2022, and are included in the final reclamation work. All proposed land uses following reclamation are consistent with the currently permitted land uses. The proposed ponds will not require any new water rights to be secured as they are covered under the existing gravel well permits which have been provided. There will be a maximum total of 40.5 acres of groundwater exposed across five ponds on site. Table 1 summarizes the existing well permits and anticipated water exposure across the site. Table 1 —Gravel Well Permit Information OwnerGravel Well ExposurePermit .. it 14, as 01 ��:.. 49434-F Precast Concepts 8.6 acres 4.2 acres LLC Property All of the pits will be converted to ponds in the worst-case reclamation scenario. The reclamation work to convert these pits to ponds is backfilling and regrading slopes to a 3H:1 V slope as necessary, topsoiling up to 6 inches, and revegetating as rangeland. Pond 1, as shown in Figure 1, is fully reclaimed as of April 2022, and will require no additional reclamation work. Ponds 2 and 3 have been partially reclaimed, with a few very short segments of unreclaimed shoreline. The southern portion of their shoreline has already been reclaimed to a 5H:1V slope as described in the previous AM-03. Pond 4 is mostly unreclaimed and would require work along nearly the entire 23 Road Pit Technical Revision 2 ®Lewieki 81 Associates April 2022