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• 2. Prior to topsoil replacement, the regraded spoil will also be visually inspected for compaction, possible root growth problems, and the potential for slippage at the topsail/spoil interface. If problems are evident, the regraded spoil will be mechanically loosened by ripping, chisel plowing, or approved alternative forms of scarification.- Ripping is often performed when thin topsoil replacement depths are utilized and where shrubs and trees are included in the post-mine revegetation species list (Redente and Hargis, 1985; Josiah, 1986). 3. The maximum soil salvage depth will continue to be evaluated on site by qualified specialists using field observation tests which primarily include clay content, rock fragment content, calcium carbonate (caliche) content, and depth to bedrock. Periodic field inspections will be made by Peabody Coal Company's soil scientist. Soil samples will be collected as necessary to correlate field • procedures with laboratory data. 4. Replaced topsoil, subsoil, and/or topsoil substitutes (i.e. suitable surface spoil) will be sampled, tested, and evaluated for fertility to ensure optimum germination, seedling emergence, and root growth conditions. A 300-foot sampling grid will be utilized whereby every four or five samples per reclamation block are composited. At a minimum, the samples will be analyzed for pH, salinity, particle size, organic matter, nitrate and ammonium nitrogen, and phosphorous. 5. The topsoil, subsoil, and/or topsoil substitute replacement depth will be closely observed and routinely inspected. Topsoil depth measurements will be recorded on a 300-foot sample grid. 6. An annual soil balance will be completed and submitted to CMLRD by April 15 of each year for the life-of-mine operation. Topsoil . replacement areas are defined on Exhibit 13-1b, Postmine Soil Replacement Depths. 9-3-14 Revised 07/18/88