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r 10 January 1997 AGE-NC Project No 95-0144 Page 3 of 3 • The lughest concentrations of dissolved hydrocarbons continue to be detected iii MW-1,near the former UST excavation • Hydrocarbon concentrations continue to fluctuate in MViW-1, the results of the November ' 1996 monitoring event indicate an increase relative to the August 1996 event Fluctuations in hydrocarbon concentrations do not appear to be related to changes in ground water �r , elevation • Petroleum hydrocarbons continue to be detected in MW-13, approximately seventy feet up- gradient of the former UST location, and MW-5, approximately 20 feet equi-gradient 4 westward of the former UST location The data from these wells will be closely watched r during future monitoring events to determine whether or not a plume of dissolved petroleum t hydrocarbons is migrating toward the former UST site ' ' Petroleum hydrocarbons were not detected in wells MW-8, MW-11, MW-12 and MW-18 , defining the down-gradient extent of impacted ground water Low concentrations of hydrocarbons were detected in the remaining wells at the site (except MW-1) • Hydrocarbon concentrations were below drinking water standards in samples collected from all wells except benzene in samples from MW-1 and MW-13 4 2 RECOMMENDATIONS Based upon data obtained during the November 1996 and previous sampling events, AGE has the a following recommendations • The next quarterly monitoring should be scheduled for February 1997, concurrent,with ' monitoring at the Van Buren site • If soil and/or ground water remediation is required by the PHS- EHD, installation of the remedial system should be initiated -50. LIMITATIONS f ` ' Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based mainly upon analytical results provided by an independent laboratory Evaluations of the geologic conditions at the site have been made from a limited number of available data points (i a ground water monitoring,wells), and subsurface conditions may vary through time'and with distance from ' these data points No other warranty, expressed or implied, is made as to the professional recommendations contained in this report