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' 21 February 2001 <br /> AGE-NC Project No 95-0128 <br />' Page 4of4 <br />' The MTBE concentrations In the off-site deep screened monitoring wells were similar to the <br /> concentrations detected In their shallow screened counterparts Based on these results, it <br /> appears that both horizontal and vertical migration of MTBE are occurring in this plume <br /> 1 <br /> 5 0. RECOMMENDATIONS <br />' Based on the results of this andrevious investigations, AGE recommends <br /> p g <br />' Continued quarterly monitoring of the ground water monitoring network <br /> • Initiation of an additional assessment of the MTBE plume and ground water extraction <br />' activities detailed in the approved in the work plan titled Interim Ground Water Remediation <br /> • Performance of a soil vapor extraction test in the shallow, fine grain soil in the current <br />' vadose zone to test feasibility for addressing impacted soil The previous vapor extraction <br /> pilot test was conducted at a time of lower ground water levels that exposed a significant <br /> sand interval in the vadose zone This sand interval is now drowned and the results of the <br />'• previous pilot test may not likely to be applicable to current site conditions <br />' 6.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing In this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the geologic conditions <br /> I at the site have been made from a limited number of available data points(1 e monitoring wells) and <br /> subsurface conditions may vary away from these data points No other warranty, expressed or <br /> implied, is made as to the professional recommendations contained In this report <br /> Advanced GeoEnvironmental Inc <br />