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I 03 October 2001 AGE-NC Project No 99-0559 Page 4 of 4 4.0. SUMMARY AND CONCLUSIONS Based on data collected during the monitoring event, AGE concludes • The currentground water flow direction was determined to be to the west-northwest • Free floating gasoline continues to be present In well MW-2, located in the area of the USTs High concentrations of TPH-g,BTEX and MTBE are present In the three surrounding ground water monitonng wells In general,the dissolved hydrocarbon concentrations have decreased in wells MW-1, MW-3 and MW-4 • The lateral and vertical extent of impacted ground water has not been defined 5.0. RECOMMENDATIONS ' Based on the findings and conclusions in this report, AGE recommends the following lie Additional assessment of the hydrocarbon and MTBE-impacted soil should be conducted east of the UST area and at the western edge of the site to determine the lateral extent of the plumes The vertical extent of impacted soil and ground water should be assessed, with the installation of additional ground water monitoring wells • Continue quarterly ground water monitoring • Interim ground water remediation should proceed immediately to minimize the migration of the free-product and high concentrations of MTBE 6.0. LIMITATIONS Our professional services were performed using that degree of care and small 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/hydro- geologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (e g ground water samples), and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional recommendations contained in this report Advanced GeoEnvironmental,Inc