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i 19 June 2001 AGE-NC Project No 97-0326 Page 5 of 7 HSU-2 ' TPH-g and various BTEX compounds were detected in water samples collected from HSU-2 in the on-site CPTs, but not in the sample from off-site CPT-03 The maximum TPH-g concentration as ' well as the maximum BTEX concentrations were detected in the ground water sample from CPT-OI at 1,400 µg/1 TPH-g, 320 µg/1 benzene, 26 µg/1 toluene, 50 µg/l ethylbenzene and 51 µg/1 xylenes Tert-butanol (TBA-5 µg/1) from CPT-02 and 1,2,4-tnmethylbenzene (14 µg11) from CPT-01 were ' the only other analytes detected Overall,lower concentrations ofpetroleum hydrocarbon compounds were detected in HSU-2 compared to HSU-1 1 HSU-3 ' TPH-g and all BTEX compounds were detected only in the ground water sample from CPT-01 (120µg11 TPH-g,2 Oµg11 benzene,7 8 µg11 toluene,3 1 µg/1 ethylbenzene and 14µg/1 xylenes),only ' benzene(3 7 µg/1)was detected in the sample from CPT-02 Low concentrations of the analytes 1,2- dichloroethane (1 3 µg/1) and 1,2,4-tnmethylbenzene (2 6 µg/1) were also detected in the sample from CPT-01 The concentrations of petroleum hydrocarbon compounds detected in HSU-3 were lower relative to the overlying HSUs HSU-4 The only ground water sample collected from HSU-4(CPT-03) contained higher concentrations of TPH-g(1,100µg/1)and BTEX compounds(280µg/1 benzene, l l µg/l toluene,3 4µg/1 ethylbenzene and 11 µg/1 xylenes) than the overlying HSU-2 and HSU-3 No other analytes were detected in this sample 1 No other petroleum hydrocarbon constituents or fuel oxygenated compounds were detected in ground ' water or soil samples by the laboratory analyses The laboratory reports (MAI Lab I D 60453 through 60465) and chain-of-custody forms are presented in Appendix B Analytical results of the CPT soil and grab ground water samples are summarized in Tables 1 and 2, respectively 1 1 Advanced GeoEnvironmental,Inc