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where acid strata (pN <5 and ABP <-5) are encountered. The monitoring program is outlined on Pages 6-153, b-153a, 6-164, and 9-40 of the PAP. No spoil samples were collected from the Wolf Creek final graded area during the 1993 field season. The 22 acres graded du r_i ng 1992 and 4.2 acres graded during 1993 will be sampled prior to soil replacement. A two 20 three _f oot-sui-t able_spoil_subsoil topdressing has been used since 1985 to cover ~~--~ acid spoil in the Nolf Creek mining area. The subsoil replacement areas are shown on _~ - - Exhibit 92.4 (P11CL, 1993). Limestone amendments have not been used [o neutralize the acid spoil. Soil Replacement Thickness. Peabody is required by CDMG to closely observe and routinely inspect soil replacement thickness in the wadge and Yolf Creek reclamation areas at Seneca 11 Mine. This monitoring requirement is included as Item 5 of the topsoil Quality Control Program presented in Tab 9, Attachment 9-4, Page 9-41 of Permit C-80-005. Historical soil replacement thickness ~i nformation for the 1984 thru 1992 reclamation blocks is presented in • Table 9-4-3, Attachment 9-4, Tab 9 of Permit C-80-OOS~the Second, Third, and Fourth Annual Topsoil and Spoil Monitoring Reports for the 1987, 1988, and 1989 field seasons, and the 1991 and 1992 Annual Reclamation Reports (PCC, 1988; 1989; 1990; 1992; PuCC, 1993). No soil replacement thickness measurements were made during 1992. Soil was replaced after [he final quarterly inspection of October 14 in the wedge reclamation area. This area, about 2.6 acres, will be sampled for soil thickness during 1994. Soil Balance. Peabody is submitting the soil balance with the Annual Reclamation Report as required by Permit L-80-005, tab 13, Page 13-29c and as recommended by Section 2.04.13(2) of Colorado's Regulations for Loal Mining. The soil balance is completed to ensure soil is salvaged, stockpiled, and replaced as recommended and approved in [he permit, and, if necessary, to reatljust the soil salvage and redistribution thickness. The soil information is also used to update [he soil volume information Peabody submitted with the 1992 Annual R ec lama[ion Report (P4LC, 1993) and confirm the mean Soil replacement [h icknes5 for [he life-of-mine disturbance area at Seneca II Mine. u 3