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• About 50 to 55 tons of waste-lime was transported by covered truck from the sugar beet <br />factory to Nucla Mine during May 1990. The lime uas applied in June over the 4.1 acres of <br />acid mine spoil using an apron-drive manure spreader. A D9L dozer with a single four foot <br />ripper shank was used [o incorporate the waste lime into the spoil. The lime application <br />rate uas selected after reviewing soil reaction, acid base potential, and sulfur <br />fractionation data presented in the 1989 Annual Topsoil Balance and Spoil duality Report <br />(PCC, 1990) and suitability criteria presented in Tab 6, Attachment 6-1, Table 6.1-3 of <br />the permit. <br />Soil Redistribution- Soil from stockpile sites 9,10, and 13 was redistributed over 13.3 <br />acres of final graded spoil in the Pit 2 reclamation area as shown on Exhibit 1. Soil was <br />replaced in June and October 1990 following procedures listed in Tab 21 of the permit. <br />Soil Thickness. A 1"=400 postmine topographic map, dated October 10,7989 was used to <br />identify sample sites, initially in the office and subsequently in the field, at which <br />soil thickness could be measured. Sites were located in the field by compass and by <br />controlled pacing from readily identified reference points. Soil thickness measurement <br />• sites were selected using a 200-foot sample grid. Soil thickness was measured on November <br />6, 1990 after the site had been disked, seeded, mulched, and crimped. A Montana <br />Sharpshooter was used to excavate a small, shallow pilot hole through the soil layer at <br />each sample site. The soil/spoil interface was easily identified by an abrupt color <br />change, texture or grain size difference, change in consistency, and/or the presence of <br />coal, shale or sandstone chips in the spoil medium. <br />A brief soil description Mas prepared at each sample site. Moist color, consistence, <br />texture. and soil thickness were recorded. <br />Soil thickness was determined at the 14 sample sites shown on Exhibit 1. Soil thickness <br />information for each sample site is listed in Table 1. Information pertaining to the <br />color, texture, and consistence of soil is contained in Peabody~s files and is available <br />upon request from the Western Division office in Flagstaff, Arizona. <br />Soil thickness ranged from 5 [0 14 inches with a mean of 8 inches. This mean soil <br />thickness is slightly greater than the mean soil depth requirement of 7 inches presented <br />in the approved soil reconstruction plan for Permit C-81-008 (EZhibi[ 21-2, Postmine Soil <br />Replacement Depths). <br />2 <br />