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6 5 Analytical Results • Halcyon Laboratories chemically analyzed three groundwater samples and one travel blank in accordance with State guidelines and EPA protocols All groundwater samples were analyzed for TPHg and BTEX by EPA Method 8015M/5030 and 8020/5030 Practical Quantitation Limits were 1 ug/l for TPH and 0 3 ug/I for BTEX The results of the laboratory analyses and the quality control documentation are included in Appendix B and summarized in Table 4 TABLE 4 n SUMMARY OF LABORATORY ANALYSIS OF GROUNDWATER SAMPLES FROM SITE INVESTIGATION" v August 25,1993 v F 5 ar x tt • 4 • • y .. s Ethyl Total Boring De th ft Benzene Toluene Benzene Xylene TPHq MW-1 2 9 46 ND ND ND ND ND MW-2 29 35 ND 3 ND 13 140 MW-3 29 15 830 1 5000 100 5700 210000 t • Results reported in ug/L (ppb) TPHg = Total Petroleum Hydrocarbons as gasoline ND = Non-Detect 7 0 DISCUSSION OF DRILLING AND ANALYTICAL RESULTS Testhole borings TH-1 and TH-4 (Exhibit 2) were advanced beneath the former gasoline storage tank cluster where elevated concentrations of petroleum constituents were found during the removal of the tanks Field screening with an FID meter detected elevated concentrations of hydrocarbons along with associated odors in soil samples collected from TH-1 from about 10 feet (bsg) to groundwater and in TH-4 from 18 feet (bsg) to groundwater Staining and discoloration of native soil was also observed in TH-1 to a depth of about 18 feet (bsg) Bonngs TH-3 and TH-6 were advanced approximately 20 feet southwest and 22 feet northeast of TH-1 , respectively Petroleum odors were detected and the FID meter registered concentrations of hydrocarbons ranging between 50 to greater than 1000 parts per million (ppmv) In soil samples collected below a depth of about 20 feet (bsg) No stained soil, however, was observed • 13 of 17