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A total of four Order 1-2 soil surveys have been completed for various - <br />portions of the Nucla Mine site 1979 (Table 1). These surveys have identified <br />two predominant soil series: Shavano and Persayo. The Shavano series is the <br />dominant soil type and is found on gentler slopes. The Persayo series is <br />found in conjunction with the Shavano soils on isolated ridges and steeper <br />slopes. The Shavano soils are typically associated with the areas previously <br />cultivated; whereas, the Persayo soils are associated with native grassland. <br /> Table 1 <br /> Acres Mine Area* Permit Application <br />Year Surveyed Surveyed Reference <br />1979 116.0 1 Tab 9 <br />1979 5.1 Portion of 3 Attachment 9-2A (Tab 9) <br />1980 29.6 4 & 5 Attachment 9'-2C (Tab 9) <br />1986 146.0 2 & 3 Attachment 9-4 (Tab 9) <br />*Reference Section XV - Operations Description for location of these mine <br />areas. <br />Topsoil is salvaged ahead of the active pit in a one lift operation. <br />Salvaging in a one lift method is desirable at the site given the depths of <br />existing soils. Mixing of horizons will not degrade the quality of the <br />material since the overall average quality of the soils in the area is fair to <br />good. <br />Soil material that is not directly redistributed is stockpiled. The <br />stockpiles are located in stable areas that are clearly marked and stabilized <br />with a vegetative cover. See Exhibit 9-3 (Tab 9) for location of the current <br />and proposed stockpile locations. <br />The original topsoil balance, performed in April, 1980 indicated that <br />approximately 1.14 feet of topsoil would be replaced over graded spoil. The <br />second topsoil balance, performed in December 1980, added in the facilities <br />and shop areas where no previous salvaging had occurred. This reduced the <br />replacement depth of topsoil to approximately 1.0 feet. The third topsoil <br />balance, completed in October, 1986 as part of the Technical Revision No. 1 <br />application, established topsoil replacement depths based upon type of <br />reclamation. A minimum of 10 inches of topsoil will be replaced on rangeland <br />reclamation areas and a minimum of 15 inches of topsoil replaced on dryland <br />pasture reclamation areas. <br />The fourth and most recent topsoil balance was completed in conjunction with <br />the 1986 soil survey (Table 1) as part of the Permit Revision No. 1 <br />application. The topsoil replacement depth for areas disturbed after the <br />enactment of the Colorado Permanent Regulatory Program will be the following; <br />a minimum of 10 inches of topsoil will be replaced on rangeland reclamation <br />areas and a minimum of 15 inches of topsoil will be replaced on dryland <br />pasture reclamation areas. Peabody is planning on redisturbing areas <br />previously mined and reclaimed under interim permit 75-36. The replacement <br />depth in these areas will be the same average depth of 6 inches as required by <br />this interim permit. The topsoil balance reveals an excess of 7.3 acre feet <br />-21- <br />