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B. In-Situ Volatilization While this is a plausible alternative, several factors weigh ` against the selection of this alternative for the site. ISV systems are expensive and require a great deal of soil a characterization information and testing. In addition, the permitting process for such systems can be lengthy. This alternative was not selected due to cost and time re- straints. C. in-situ Flushing This alternative would require saturating the soils and extracting the flush water. Because this alternative is subject to the same restraints as presented for alternative o B, .in-situ flushing was not practical for the site. io Based on time constraints, costs and the limited extent of the compound presence, Alternative A, excavation of soils in excess of 10 .mg/Kg (or ND if feasible) TPH was selected as the preferred remedial action. ( 3.0 REMEDIAL PROJECT DESCRIPTION 3.1 Excavation As hydrocarbon compounds within the soil appear to be centralized around borehole -� #3 (Figure 2) , it is propa.;sed that a stepped excavation be conducted at the site with the lower limit of the excavation being ::he saturated zone (approximately 301) . The initial step of the excavation is to excavate soils radially 201 from the location of borehole #3. The initial excavation quanti- ty, as shown in Figure 3, will equal approximately 350 cu. yards of soil. The soil. removed during this initial step will be placed in three piles on plastic sheeting at the site. The piles will be for each vertical 101 of excavation (i.e. , first pile from 0-10, vertically) . From these stockpiles, a single compos-- ite sample will be collected. The compositing will be conducted by visually quartering each stockpile and collecting four sepa- rate samples .from each pile (one per quarter) . The four separate samples will then be composited to provide a single sample for F each pile. The samples will ;.:hen be analyzed within twenty-four hours for the following parameters: o Total Petroleum Hydrocarbons (heavy) (TPH) - EPA Method 8015 (mod) . o Benzene, Toluene, Xylene and Ethylbenzene (BTX&E) - EPA Method 8020. The stockpiled soils will be covered with plastic tarps until the composite sample analytical results are received. Any stockpile which exhibits TPH concentrations above 1000 mg/kg will be �p - 9MMA- s_-