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a f, <br /> r .ti <br /> 13 October 2000 <br /> AGE-NC Project No 95-0111 <br /> rPage 3 of 4 Qj <br /> was detected above laboratory reporting limits in the ground water samples analyzed <br /> r <br /> Analytical results of the ground water samples are summarized in Tables 2 and 3 The laboratory <br /> Yt gT p <br /> reports (MAI Laboratory Sample Nos 47439 through 47446), quality assurance and quality control <br /> rreport and chain-of-custody forms are included in Appendix B <br /> r4.0. SUMMARY AND CONCLUSIONS <br /> rBased on the findings from this investigation, the following conclusions are presented <br /> • The northerly ground water flow direction inferred from data collected during this <br /> r monitoring event is consistent with ground water flow directions determined during past <br /> monitoring events at the site ' <br /> • The concentrations of TPH-g, TPH-d and BTE&X detected in the ground water samples <br /> rremain near the low end of the range of concentrations previously detected The <br /> hydrocarbons are located primarily in the down-gradient direction from the UST facility <br /> r� (wells MW-1, MW-4 and MW-5) Hydrocarbons have not been detected in the most down- <br /> gradient well (MW-6) over the last seven quarters <br /> • MTBE was only detected in three wells (MW-1, MW-4 and MW-7) with the highest <br /> rf concentration (67 ,ug/l) occurring immediately down-gradient of the UST facility(MW-1) <br /> VJ06 Only trace concentrations of MTBE were detected in MW-4 and MW-7 <br /> r <br /> 5.0. RECOMMENDATIONS <br /> rIn summary, five years of monitoring ground water has shown that the ground water flow direction <br /> has been consistently toward the north-northeast to northeast The data also demonstrates that the <br /> r plume of hydrocarbon-impacted ground water appears to be fairly stable and not actively migrating <br /> Concentrations of hydrocarbons and MTBE are generally low Based on these points, AGE <br /> recommends that a comprehensive closure request report be prepared for submittal to the PHS-EHD <br /> rand CVRWQCB <br /> r6.0. LIMITATIONS <br /> r Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon <br /> . analytical results provided by an independent laboratory Evaluations of the geo logic/hydro geologic <br /> rconditions at the site for the purpose of this investigation were made from a limited number of <br /> Advanced GeoEnvaronmental Inc <br /> r <br />