REV92244 - Laserfiche WebLink

Home Browse Search

Rule 2.04.9 Soils Resource Information South Taylor 15. The Walsh (1984) "Soil Inventory Danforth Hills Project" report was properly incorporated into the application as Exhibit 9, Item 7. Response Accented. 16. Various discrepancies on Tables 2.04.9-6 and 2.04.9-7 were properly addressed; however there is a remaining discrepancy on amended Table 2.04.9-6. Map unit WRD is listed twice; the second listing appeazs to be erroneous, and should probably be TRD, instead (to correspond to Table 2.04.9-7). Please replace the second listing of WRD on Table 2.04.9-6 with TRD as appropriate. i 17. Section 2.04.9 Soils Resource Information text and Tables 2.04.9-6 through 2.04.9-7, were properly updated to address various inconsistencies, to provide requested detail, and to more fully incorporate information from the 1984 Walsh Associates study for Consolidated Coal Company. Response also indicates that text in Section 2.05.4(2)(d) was amended as requested to clarify topsoil average replacement thickness and to acknowledge that revision approval will be obtained prior to implementation of a variable thickness replacement plan. The acknowledgement of need for revision approval to implement variable topsoil replacement was provided, but text was not amended to clarify the average uniform replacement thickness. Referenced text specifies a minimum depth of twelve inches, but does not specify an average uniform replacement thickness. The replacement thickness projection should be based on information presented in amended Table 2.04.9-7, which incorporates information from Tables 2.04.9-6 and 2.04.9-6A. Note that the topsoil volume indicated by the tables would allow for an average replacement thickness of approximately 2.8 feet (34 inches) over the entire area of disturbance associated with the South Taylor mine azea. Based on past operations at Colowyo, this projected total volume and average replacement thickness seems greater than might be expected. Review of information presented in the 1984 CCC Soils Report indicates that, for certain soil types, the projected average salvage thickness includes a substantial thickness of suitable subsoil, in addition to the surface soil horizon. Text in Section 3.2, on page 33 of the report states: Most of the upland soils occurring under aspen or oakbrush have mollic epipedons which should be salvaged in lift 1. Below the mollic epipedons are light colored, gravelly, or clayey subsoils suitable for lift 2 if necessary. Upland soils supporting oakbrush/mountain shrub vegetation include Barnette Loam, Jerry Loam, Lamphier Loam, and Rhone Loam soil types. One or more of these soil types are significant components of JBB, JBC, LRD, NBD, ND, RB, and RBD map units.