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6.3.2.4 Asphalt Surfacing <br /> • <br /> Once remediation of the shop site is complete, the originally paved areas <br /> will be repaved with 3 inches of asphalt over and 8 inch compacted soil base. <br /> 6.3.3 Altgrnativ-e S - Excavation to 1000 ppm (Accessible) with Landfarming <br /> The remedial action alternatives which specify excavation of accessible <br /> soils will not include demolition of the maintenance shop. Instead, sheet <br /> piling will be driven in parallel to the walls to prevent undermining the <br /> building foundation. In this case, soils with 1000 ppm TPH or greater outside <br /> the building footprint will be excavated and landfarmed on-site. <br /> 6.3.3.1 Sheet Piling Installation <br /> Sheet piling is large corrugated interlocking steel reinforcements that <br /> can be used to support vertical walls of excavations. The piling is driven <br /> using an ordinary pile driver to the desired depth before excavation begins, <br /> and the interlocking sheets can be used to support the foundation of the <br /> entire building. The pilings must be located as close as possible to the <br /> foundation to maximize the amount of removable contaminated soil. <br /> 6.3.3.2 Earth Moving <br /> Excavation at the former AFPC site will be performed with standard <br /> construction equipment. Approximately 18200 cu yds of uncontaminated soil <br /> overburden will be removed with backhoe and bulldozer and segregated for later <br /> replacement. Approximately 5700 cu yds of contaminated soil will be excavated <br /> using a backhoe. k loader will then either load the material into trucks or <br /> transport the material directly to the landfarming area, depending on the <br /> distance to the available on-site location. <br /> 6-12 <br /> BS/0204b <br />