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1 3 2 1 Sample Collection 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 (BTEX) Two samples from each bore hole were analyzed for Total Or aruc Lead Chemical analyses were performed by BSK& Associates State-certified analytical laboratories 3 2 2 Analytical Results Results of the chemical analyses of the soil borings are summarized in Table 1 Laboratory Data Sheets, Sample Cham-of-Custody and Request for 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 A-A', Figure 3 TPHg concentrations increase with depth to a high of 13,000 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 r 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 33 Pilot Test Data and Results In addition to the vapor extraction well and manometer points, the pilot test system included a 15-HP Rotron vacuum blower and four 220-pound granular activated ' carbon canisters arranged as shown on the schematic diagram, Figure 4 The pilot 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- Sampler 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/l to 200 mg/l during the three days of operation A PID was used to monitor VOC concentrations at the inlet and outlet of the carbon y 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 REM EDI AT ION ' SERVICES, INC - 0 �L _A-