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• also been placed in two new stockpile locations (KK and EE) over the <br />last two years. All topsoil stockpile additions since October, 1983 <br />were determined by utilizing representative cross sections. The current <br />topsoil volume for each stockpile is presented in Table 9-4-1. <br />Existing Disturbance Area <br />Topsoil has been salvaged ahead of mining at Seneca II Mine using <br />techniques described in SMP No. C-005-80, Volume IV, Tab 9, Attachment <br />9-1, Section 2. Since 1984, the majority of this topsoil has been <br />directly hauled to final graded reclamation areas. The short term <br />excess of salvaged topsoil was stockpiled at locations Z, EE, HH and KK. <br />All existing disturbance areas shown on Exhibit 9-3, Topsoil Balance <br />Plan were determined from 1" = 400' monthly reclamation progress maps, a <br />1" = 400' May 1, 1986 vertical aerial photograph, and on-site field <br />checks. The total disturbance area which requires topsoil replacement <br />as of August 1986 is 710.9 acres (presented later in Table 9-4-4). <br />• Proposed Topsoil Salvage Area <br />All topsoil reserves will be salvaged at Seneca by the end of mining <br />year 1996 (Operations Plan, Exhibit 12-1). Proposed topsoil salvage <br />areas are outlined on the Topsoil Balance Plan, Exhibit 9-3. <br />The following technique was utilized to verify the topsail salvage <br />depths assigned to each soil map unit. First, the volume of topsoil <br />projected to be salvaged between the July 1984 topsoil balance and the <br />August 1986 topsoil balance was determined. The projected volume of <br />topsoil to be salvaged during this period was 301.5 acre feet (Table <br />9-4-2). Second, the topsoil replacement areas for the July 1984 through <br />August 1986 period were determined from 1" = 400' monthly reclamation <br />progress maps, a 1" = 400' May 1, 1986 vertical aerial photograph, and <br />on-site field checks. This July 1984 through August 1986 topsoiled area <br />• totalled 211.0 acres. Third, the topsoil replacement areas were field <br />checked and sampled on a 300 foot grid to determine the topsoil <br />replacement depths. Topsoil replacement depths for all 143 sample <br />locations are presented in Table 9-4-3. Topsoil replacement depth <br />9-29 Revised 10/01/86 <br />