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17 December 1998 <br /> • AGE-NC Project No 95-0173 <br />' J <br /> Page 5 of 5 <br />' • None of the fuel oxygenating compounds were detected in the analyzed water samples. <br /> However,based on historical detection,DIPE and/or TBA may be present at MW-3,MW-6, <br /> VW-I and AW-2B but may have been masked due to raised detection limits <br /> • From December 1996 to October 1998, decreasing concentrations of total petroleum <br /> hydrocarbons have been reported from MW-1 (Appendix F) <br />' • For the second consecutive quarter, laboratory analysis reported the detection of <br /> tetrachloroethene(PCE) from well MW-11 at a concentration of 2 6 ppb PCE is a chemical <br /> compound commonly utilized within the dry cleaning industry AGE does not believe that <br />' the detection of PCE from well MW-11 is related to the current investigation <br /> • The dissolved petroleum hydrocarbon plume appears to be sufficiently contained within the <br />' current array of ground water monitoring wells, however the increased hydrocarbon <br /> concentrations in some northern wells and decreased concentrations in some southern wells <br /> may indicate migration of the plume northward <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected during October 1998, AGE recommends <br />' e Continued quarterly ground water monitoring and sampling should be performed at the site <br /> to monitor dissolved TPH-g, TPH-d, BTEX,MTBE and fuel oxygenating compounds at the <br />' site The next quarterly monitoring event should be tentatively scheduled for January 1999 <br /> • Preparation of a Remedial Action Work Plan Upon regulatory approval, on-site remediation <br />' should commence <br /> 6.0. LIMITATIONS <br /> 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 mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation are made from a limited number <br /> of available data points(e g ground water samples), and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> Srecommendations contained in this report <br />' Advanced GeoEnvironmental,Inc <br />