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i e r 3.2.1 Sam to ollection Soil samples were obtained from the extraction well and manometer point borings at five-foot intervals, starting at approximately ten feet below the existing grade. Soil samples were screened with a photoionization detector (PID). Vapor concentration readings are noted on the Boring Logs (Appendix A). Selected soil samples were analyzed for Total Petroleum Hydrocarbons as Gasoline(TPHg),and Benzene,Toluene,Ethyl Benzene and Total Xylenes(BaEX), Two samples from each bore hole were analyzed for Total Or anic Lea Chemical analyses were performed by BSK&Associates w State-certified analytical laboratories. 3.2.2 An I i 1 Re �1 s Results of the chemical analyses of the soil borings are summarized in Table 1. Laboratory Data Sheets,Sample Chain-of-Custody and Request for Y� Analysis documentation are presented in Appendix B. The analytical results indicate the extent and concentrations of petroleum hydrocarbon contamination are approximately as shown on the cross-section .,, AW,Figure 3. TPHg concentrations increase with depth to a high of 13,000 t mg/kg at a depth of approximately 40 feet below the former tank emplacement. From 40 feet to 55 feet,TPHg concentrations decrease to less than 1000 mg/kg. From approximately 60 feet to 66 feet, which was the maximum boring depth, TPHg concentrations increase to 5000 mg/kg in MP-2. 3.3 Pit T D a nd R sults �_. In addition to the vapor extraction well and manometer points, the pilot test system included a 1.5-HP Rotron vacuum blower an.l four 220-pound granular activated carbon canisters arranged as shown on the schematic diagram, Figure 4. Thep ilot test was conducted on December 18-20 for approximately five hours each day. Vacu-Sampler containers were used to collect vapor samples at the inlet to the carbon beds. Sample collection points are indicated on Figure 4. The Vacu- Sample containers were submitted to the laboratory for analysis for TPHg and BTEX. Table 2 summarizes vapor sample analytical results. TPH-gasoline concentrations in the extracted vapor ranged from 160mg/1 to 200 mg/l during the three days of operation. y A YID was used to monitor VOC concentrations at the inlet and outlet of the carbon beds: No VOC emissions were detected at the outlet of the carbon beds. Field measurements of system operating parameters are summarized on Table 3. Manometer readings indicate that the extraction well radius of influence extended to MP-2, approximately 25 feet from VEW-1. 3 IReMsaiaT+oe SERVICES, INC.