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Topsoil Salvage Area Topsoil will be salvaged from the borrow areas associated with the dam construction, the dam embankment, and the heavy equipment traffic areas. Table 1 lists the area of each soil map unit within the proposed permit extension area and the area to be affected in each unit. Table 2 lists the soi] map units from the existing permit area (C-005-80) which will also be disturbed during construction of Sediment Pond 008. The projected disturbance boundary for the entire 008 pond construction site is shown on Exhibit 12-1, Operations Plan. Topsoil salvage depths and volumes are also included in Table 1. Topsoil salvage depths are identical to those previously utilized in the August 1986 Topsoil Balance submitted in Tab 9, Attachment 9-4 of the Seneca II Permit (C-005-80) Renewal. The major topsoil salvage limitation wiil be the saturated soil conditions associated with map unit AW. No suitable topsoil is available to be salvaged from the saturated AW soil map unit (Tables 1 • and 2). First, the high ground water level would severely restrict the '' mobility of topsoil salvage equipment. Second, considerable irrepairable physical damage would occur during the handling of the saturated soil. A saturated soil has a very weak aggregate stability. Consequently, soil structure would be destroyed by puddling and severe compaction would occur during topsoil salvage, stockpiling, and replacement. The resultant large, dense clods would be nearly impervious to root penetration. In summary, topsoil salvage and disturbance within much of the immediate pond area will be avoided due to high ground water conditions. However, all suitable topsoil will be salvaged wherever deeper, localized ground water conditions are encountered during the topsoil salvage operation. Topsoil Replacement Salvaged topsoil will either be hauled directly to and redistributed on _ regraded spoil areas or stockpiled at location I-I (Exhibit 12-1, 9-46 Revised 05/27/87