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13 July 1998 <br /> AGE-NC Project No 96-0254 <br />' Page 6 of 7 <br />' Benzene was detected in both of the above mentioned water samples at concentrations ranging from <br /> 200 and 480 ppb, respectively Other BTE&X compounds were detected at concentration as great <br /> as 600 ppb (xylene) Oxygenated compounds were not detected in the water samples collected from <br /> the site <br /> Laboratory results of grab ground water samples analyzed for petroleum hydrocarbons are <br />' summarized in Table 2 - Analytical Results of Water Samples The laboratory reports (MAI <br /> Laboratory ID 86325 to 86331), QA/QC reports and chain-of-custody forms are included in <br /> Appendix D <br /> I <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • Ground water at the site was encountered at a depth of approximately 5 feet bsg The <br /> prevailing ground water flow direction at the site is generally northward <br /> • • The most intensely hydrocarbon-impacted soil was encountered in the area of the former <br /> USTs Hydrocarbon-impacted soil was not observed in the soil borings established on the <br /> exterior of the inferred dissolved hydrocarbon plume <br /> • The highest concentration of dissolved hydrocarbons quantified as TPH-g and overall <br /> BTE&X compounds were detected in well MW-1 The lateral extent of the dissolved phase <br /> plume is limited by analysis of samples collected from wells MW-2, MW-3, MW-5, MW-6 <br /> and the oW monitoring well established ori os ithern portion of the adjacent property north <br /> of the site (MW-3) <br /> • Oxygenated compounds were not detected in the analyzed soil and ground water samples <br /> collected from the site and from off-site <br /> I50. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br /> • Quarterly monitoring should be scheduled for July 1998 <br /> E • If remediation of soil and/or ground water appears to be necessary for the site, a Corrective <br /> Action Plan (CAP) should be prepared The CAP should include rernediation feasibility <br /> studies (e g in-situ air sparging pilot test, soil vapor extraction, soil excavation and bio- <br /> Advanced GeoEn%tronmental Inc <br /> I <br />