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19 March 1999 <br /> AGE-NC Project No 97-0312 <br /> Page 3 of 4 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g and TPH-d were detected in the sample collected from monitoring well UST-5 at <br /> concentrations of 420 parts per billion (ppb, reported as micrograms per liter) and 220 ppb, <br /> respectively Benzene, toluene, ethylbenzene and xylenes were detected in this sample at <br /> concentrations of 23 ppb, 7 4 ppb, 2 1 ppb and 7 7 ppb, respectively BTEX were detected in the <br /> samples collected from UST-3 and UST-4 at concentrations as high as 8 7 ppb (toluene, UST-3) <br /> Petroleum hydrocarbons were not detected in sample collected from UST-2 <br /> Sec-butyl benzene, 1,2-Dichloroethane (DCA) and vinyl acetate were detected in the sample <br /> collected from UST-5 at concentrations of 1 1 ppb, 1,000 ppb and 13 ppb respectively Other <br /> volatile organic compounds, including oxygenating compounds, were not detected in ground water <br /> samples from the site The analytical results are summarized on Tables 2 and 3 The laboratory <br /> report (MAI sample Nos 00876 - 00879) and chain-of-custody form are included in Appendix B <br /> 4.0 DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> o Ground water elevation increased at the site between the September and December 1998 <br /> monitoring events Ground water was approximately ten feet above the screened interval in <br /> UST-2, UST-3 and UST-4 Ground water was approximately one foot above the screened <br /> interval in UST-5 <br /> • Concentrations of hydrocarbons generally increased slightly at the site between the <br /> September and December 1998 sampling events <br /> The concentration of benzene in UST-3 and UST-5 and the concentration of DCA in UST-5 <br /> were above the State of California drinking water Maximum Contaminant Level (MCL) <br /> during the December 1998 monitoring event <br /> 5.0. RECOMMENDATIONS <br /> Based upon data obtained from the site, AGE recommends the following <br /> Further assessment of the extent of impacted soil has been required b the PHS-EHD A <br /> p q Y <br /> work plan to fully assess impacted soil at the site was approved by the PHS-EHD in March <br /> 1999 Initiation of the proposed assessment is scheduled for April 1999 <br /> Advanced GeoEnviron mental,Inc <br /> J <br />