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1 ' I <br /> 20 March 1996 <br />' AGE NC Project No 95-0139 <br /> Page 5 of 6 <br /> - <br /> ppb (xylenes) No petroleum hydrocarbons were detected in monitoring wells MW-2, MW-3 or <br /> MW-4 during the January 1996 sampling event The analytical results of the ground water samples <br />' are summarized in Table 2 The laboratory report (WEST Sample Log 13788) and chain-of-custody , <br /> form are included in Appendix B <br /> 1 43 STRATIGRAPHY <br />' A At lens was encountered in probing B7 at a depth of 12 5 feet Clay to silty clay was encountered <br /> in the remaining depth of all probings at the site Boring logs are included in Appendix C <br /> 4 4 LABORATORY ANALYSIS OF GEOPROBE SAMPLES <br /> ITP1i g was detected in soil samples from borings B5 and B6 at concentrations up to 37 mg/kg (ppm, <br /> B5-13) TPH-d was detected m soil samples from probings B5, B6 and B7 at concentration up to 25 <br /> ppm BTE&X were detected in soil samples collected from probings B5 and B6 at concentrations <br /> ranging from 0 005 (benzene, B5-13) to 0 16 ppm (xylenes, B6-13) No petroleum hydrocarbons <br /> were detected in samples from probings B8 and B9 nor in the grab ground water sample collected <br /> from probing B9 Analytical results of the soil and grab ground water samples are summarized in <br /> Table 3 The laboratory report (MAI Laboratory I D Nos 60680 through 60687) and chain-of- <br /> custody form are included in Appendix D <br /> 5.0. CONCLUSIONS AND RECOMMENDATIONS <br /> 5 1 PETROLEUM HYDROCARBON-IMPACTED GROUND WATER <br /> Concentrations of TPH-g and TPH-d in MW-1 remained similar to the sampling event in June 1995 = <br /> However, concentrations of BTE&X decreased The non-detection of petroleum hydrocarbons in <br /> MW-2 or MW-3 indicates that the plume remains sufficiently defined at the eastern and southern <br /> portion ,of the site This assumption is corroborated with the non-detection of petroleum <br /> hydrocarbons in the down gradient well MW-4 during this sampling event Ground,water flow <br /> direction and gradient have remained consistent at the site over the past nine months Thus, the <br /> impacted-ground water plume appears have remained stable during this quarter <br /> 4 _ <br /> 5 2 PETROLEUM HYDROCARBON-IMPACTED SOIL <br /> Concentrations of petroleum hydrocarbons detected in the soil samples did not indicate the presence <br /> of a large volume of impacted soil The field data and analytical results 'of samples collected from <br /> 1 , <br />