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3 <br /> 28 March 1997 <br /> 'AGE-NC Project No 95-0144 <br /> 1 Page 3 of 3 <br /> ' 0 The highest concentrations of dissolved hydrocarbons continue to be detected in MW-1, near <br /> the former UST excavation <br /> • Hydrocarbon concentrations continue to fluctuate in MW-1, showing a decrease during the <br /> first quarter of 1997 Fluctuations of hydrocarbon concentrations do not appear to be related <br /> to changes in ground water elevation, or to be following a well defined trend, although, in <br /> general, hydrocarbon concentrations have decreased in this well since December 1994 <br /> • Petroleum hydrocarbons were not detected in MW-13, approximately seventy feet up- <br /> gradient of the former UST location, nor in MW-4, MW-8 and MW-18, located down <br /> gradient of the'former UST location <br /> • Low concentrations of TPH-d were detected in MW-2, MW-5 and MW-12, located equi- <br /> ' gradient from the former UST location and in MW-11, located down-gradient of the former <br /> UST location <br /> • Hydrocarbon concentrations were below drinking water standards in samples collected from <br /> all wells except benzene in the sample from MW-1 <br /> _ <br /> 42 RECOMMENDATIONS <br /> Based upon data obtained during the February 1997 and previous sampling events, AGE has the <br /> following recommendations <br /> • A revised Corrective Action Plan (CAP)was submitted to the PHS-EHD in March 1997 The <br /> CAP recommended excavation at the former locations of UST No 1 and UST No 8 and <br /> natural attenuation in the area of former UST,Nos 3-6 Upon approval of the PHS-EHD, <br /> recommendations of the CAP should be implemented <br /> ■ The next quarterly monitoring should be scheduled for May 1997, concurrent with monitoring <br /> at the Van Buren site <br /> 50 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in thus or similar localities The findings were based mainly upon <br /> t analytical results provided by an independent Iaboratory Evaluations of the geologic conditions at <br /> the site have been made from a limited number of available data points-(i e ground water monitoring <br /> wells), and subsurface conditions may vary through time and with distance from these data points <br /> No other warranty, expressed or implied, is made as to the professional recominendations contained <br /> in this report <br />