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15 June 2001 <br /> AGE-NC Project No 96-0253 <br /> Page 6 of 6 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br />' Depth to ground water ranged from 7 01 feet to 8 09 feet below the well casing tops The <br /> prevailing ground water flow direction in March 2001 was inferred to be towards the <br /> northwest at an average hydraulic gradient of 0 004 feet/feet <br /> • None of the target analytes were detected in the selected soil samples collected from <br /> monitoring well pilot borings MW9, MW10 and MW11 The lateral and vertical extent of <br /> impacted soil has been delineated (Figures 4 and 5) The approximate areal extent of <br /> impacted soil is depicted on Figure 9 <br /> • The dissolved hydrocarbon plume extends northward from the former UST and dispenser <br /> areas but probably not significantly beyond the two down-gradient monitoring wells (MW <br /> I 9 and MW 10) The plume has been defined in all directions Isocontour maps illustrating the <br /> approximate extent of TPH-g-, benzene- and MTBE-impacted ground water are depicted on <br /> Figures 6, 7 and 8 <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of the this investigation, AGE recommends <br />' - Continued quarterly monitoring of the ground water monitoring wells The next monitoring <br /> event should be performed 3n June 2001 <br />' Preparation of a Problem Assessment Report (PAR) to explore remediation alternatives for <br /> the site <br /> I <br /> 5.0. 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 upon <br />' analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions <br /> at the site for the purpose of this investigation was made from a limited number of available data <br /> points (ground water and soil samples) and subsurface conditions may vary away from these data <br />' points No other warranty, expressed or implied, is made as to the professional recommendations <br /> contained in this report <br /> 1 <br /> Advanced GeoEnviranmenta3,Inc <br /> i <br /> 1 <br />