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r 1 25 ;March 2002 AGE-NC Project No 97-0326 ' Page 6 of 9 f µg11), n-propyl hen7ene (74 µg/1) and 1,1,2-tnchloroethane (30 µg/1) were detected in the sample from off-site boring CPT-03 HU2 TPH-g and various BTEX compounds were detected in water samples collected from HU2 in the on- site CPTs and off-site CPT-4, but not in the sample ftom 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-01 at 1,400 µg/1 TPH-g, 320 µg/1 benzene, 26 µg/1 toluene, 50 µg/1 ethylbenzene and 51 µg/1 xylenes Tert-butanol(TBA-5 µg/1) from CPT-02 and 1,2,4-tnmethylbenzene (14 µg/1) from CPT-01 were the only other analytes detected Overall, lower concentrations of petroleum ' hydrocarbon compounds were detected in HU2 compared to HUl A map showing lateral TPH-g and benzene distributions is provided as Figure 6 HL TPH-g and all BTEX compounds were detected only in the ground water sample from CPT-01 (120µg/1 TPH-g,2 0µg/1 benzene,7 8 µ.g/1 toluene,3 1 µg11 ethylbenzene and 14 µg/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 ofpetroleum hydrocarbon compounds detected in HU3 were lower ' relative to the overlying HUs No ground water sample was collected at this interval from CPT-4 ' HU4 Ground water samples were collected within HU4 from CPT-03, CPT-4 and CPT-5 TPH-g and ' BTEX compounds were detected in all samples, the highest concentrations of TPH-g (6,200 µg/1) and BTEX compounds (1,900 µg/1 benzene, 65 µg/1 toluene, 29 µg/1 ethylbenzene and 59 µg/1 xylenes) were encountered in the sample from off-site CPT-4 No other analytes were detected in ' the samples A map showing lateral TPH-g and benzene distributions is provided in Figure 7 • ' Advanced GeoEnvironmental,Inc