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aiL G1if <br /> . 20 October 1997 <br /> AGE-NC Project No. 95-0109 <br /> Page 4 of 5 <br /> (MAI Laboratory I. D. Nos. 80832 through 80838) and chain-of-custody forms are included in <br /> Appendix B. <br /> 3.4. PURGE WATER SAMPLING <br /> Petroleum hydrocarbons were not detected in the composite sample collected from purge water <br /> stored at the site. The purge water was subsequently splashed on-site. The laboratory report (MAI <br /> sample No. 80298) and chain-of-custody form are included in Appendix D. <br /> 4.0. CONCLUSIONS <br /> Based upon data collected during the September 1997 sampling event, AGE concludes the <br /> following: <br /> • Ground water flow direction continues to be south-southwest near the northern portion of the <br />• site, shifting to south-southeast near the southern portion of the site. <br /> • Petroleum hydrocarbons were not detected in wells MW-6 or MW-12 during the September <br /> 1997 sampling, which indicates the dissolved hydrocarbon plume has not migrated up- <br /> gradient or down-gradient of previously known limits. <br /> • Between June and September 1997, concentrations of petroleum hydrocarbons decreased in <br /> wells MW-7, MW-8, MW-I1 and MW-14. Hydrocarbon concentrations increased in one <br /> well, MW-9. The Charts in Appendix C strongly suggest that these variations in samples <br /> from wells MW-8, MW-9 and MW-14 are natural fluctuations on this site, and are not <br /> necessarily indicators of long-term trends. <br /> • MTBE was not detected in any of the ground water samples collected during this monitoring <br /> period. <br /> • Nutrient concentrations and bacterial counts are not at optimum levels to promote biologic <br /> breakdown of hydrocarbon contaminants on the site and should be augmented to accelerate <br /> the remediation process. <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends the following: <br /> Advanced GeoEnvironmental,Inc. <br />