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25 August 1995 <br /> AGE-NC Project No 95-0143 <br /> Page 5 of 6 <br /> chain-of-custody form are presented in Appendix D <br /> 4 4 2 WATER SAMPLES <br /> TPH-g was detected in the water samples from probings GP25, GP26 and GP28 at concentrations <br /> of 540 ppb, 2,900 ppb and 4,000 ppb, respectively Benzene was detected in samples from probmgs <br /> GP21, GP25, GP26 and GP28 at concentrations of 16 ppb, 77 ppb, 560 ppb and 7 4 ppb, <br /> respectively Low concentrations of toluene, ethylbenzene and xylenes were detected in several <br /> samples The analytical results are summarized on Table 4 The laboratory report and chain-of- <br /> custody form are presented in Appendix D <br /> 5.0. CONCLUSIONS & RECOMMENDATIONS <br /> 5 1 HYDROCARBON-IMPACTED SOIL <br /> • Only low concentrations of petroleum hydrocarbons were detected in two soil samples collected at <br /> depths of 25 feet (GP 18 & GP21) Petroleum hydrocarbons were not detected in samples collected <br /> at a depth of 20 feet in either of these bonngs <br /> Petroleum hydrocarbons were not detected in soil samples collected from probings GP20, GP22 and <br /> GP24, defining the eastern and southern extent of impacted soil <br /> 5 2 HYDROCARBON-Uv PACTED GROUND WATER <br /> Elevated concentrations of petroleum hydrocarbons were detected in all monitoring wells located on <br /> site Moderate concentrations of hydrocarbons detected in water samples collected from probmgs <br /> GP25, GP26 and GP28 indicate that these probings are within the impacted ground water plume <br /> Low concentrations of benzene, toluene and xylenes were detected in water samples from probings <br /> GP 19, GP21 GP27 and GP29 These probing locations appear to be near the western extent of <br /> impacted ground water Only low concentrations of toluene and xylenes were detected in the water <br /> sample collected from GP20, defining the southeastern extent of the contaminant plume <br /> No hydrocarbons were detected in the water sample collected from probing GP32 and only xylenes <br /> were detected in samples from probings GP31 and GP34 at slightly above reporting linuts defining <br /> . the down-gradient extent of unpacted ground water Only low concentrations of toluene and xylenes <br /> were detected in the water sample collected from probing GP30, giving definition to the eastern <br />