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After purging each well of three well casing volumes of water, a groundwater sample was collected from each well using a disposable polyethylene bailer The samples were ' carefully poured from the bailer into two 40 ml glass vials (VOA vials) and two 1 liter amber glass bottles The sample bottles were labeled, recorded on a chain-of-custody, and stored ' in a chilled ice chest for transportation to American Environmental Network (AEN - a State certified analytical laboratory) A travel blank was prepared using distilled water to evaluate ' potential sample contamination Transport and handling of samples was performed under strict chain-of-custody protocol The groundwater analytical data sheets and chain-of-custody ' records are included as Appendix A ' The groundwater samples were analyzed for BTEX and Total Petroleum Hydrocarbons (TPH) using EPA Methods 602 and 5030, respectively, and TPH-E using EPA Method 3510 The travel blank was analyzed for BTEX and TPH Results of the historical and recent groundwater chemical analyses are presented in Table 2 ' 4.0 DISCUSSION OF GROUNDWATER QUALITY Groundwater samples collected from MW-1 indicated the presence of petroleum hydrocarbons within the gasoline range (TPH-g = 0 09 mg/I), and the diesel range (TPH-d = ' 0 2 mg/L), as well as benzene (2 µg/L), toluene (6 pg/L), ethylbenzene (1 pg/L), and total xylenes (6 pg/1) Of these, TPH-g, TPH-d, benzene and ethylbenzene were not previously ' detected in samples collected from this well, and the highest historical detections of toluene (0 5 pg/L in December, 1993) and total xylenes (0 9 pg/L in July, 1993) were approximately ' one order of magnitude lower than the current results (Table 2) ' Groundwater samples collected from MW-2 yielded the same compounds as MW-1, although at slightly higher concentrations TPH-g (1 3 mg/L), TPH-d (0 2 mg/L), benzene ' (50 pg/L), toluene (9 pg/L), ethylbenzene (28 pg/L), and total xylenes (63 pg/L) were detected in the water samples collected from MW-2 (Table 2) Historically samples from this well yielded maximum concentrations of TPH-d (0 1 mg/L in December, 1993), toluene (1 9 µg/L in December, 1993), ethyl benzene (0 6 pg/L in July, 1993) and total xylenes (0 7 pg/L in December,1993)(Table 2) TPH-g and benzene were not detected in samples collected historically from this well ' = qtr% 2 1