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17 December 1997 • AGE-NC Project No 95-0144 ' Page 3 of 4 4.0. SUMMARY/CONCLUSIONS Based upon data collected from the site, AGE concludes the following • Only low concentrations of TPH-d and xylenes were detected in MW-1, continuing the trend of decreasing hydrocarbon concentrations • Low concentrations of dissolved TPH-d were detected in six wells at the site • Petroleum hydrocarbons were not detected in samples collected from MW-8, MW-11 or , MW-12, located down-gradient and cross-gradient west of the former UST location Low concentration of TPH-d were detected in MW-18 and MW-13, located cross-gradient east and approximately 100 feet up-gradient of the former UST location • Four volatile organic compounds were detected by EPA Method 8260 Drinking water standards have not been established for the compounds detected Oxygenated volatile organics were not detected at the site • The dissolved hydrocarbon plume at the site does not appear to be migrating lie 5.0. RECOMMENDATIONS Based upon data obtained during the November 1997 and previous sampling events, AGE recommends the following • implementation of a revised Corrective Action Plan (CAP)prepared by AGE on 28 February ' 1997 and approved by the PHS-EHD for the removal of hydrocarbon-impacted soil at the former locations of UST No 1 and allowing natural attenuation in the area of former UST " Nos 3-6 ' At the request of the PHS-EHD, further assessment was performed in the area of UST No 8 in December 1997 Procedures and findings will be presented in the Quarterly Report for the February 1998 monitoring event , • The next quarterly monitoring should be scheduled for February 1998, concurrent with monitoring at the Van Buren site ' 6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by Advanced GeoDiumunental,Inc y `