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26 September 2008 <br /> AGE-NC Project No. 07-1587 <br /> Page 7 of 7 <br /> • The vertical extent of hydrocarbon-impacted soil near in source area is unknown. The <br /> vertical extent of hydrocarbon-impacted soil is known to the north by boring B2 at 60 feet <br /> bsg; to the south west by boring B5 at 40 feet bsg and is undefined in all other directions. <br /> • The lateral extent of hydrocarbon-impacted soil is unknown in every direction(Figure 4). <br /> • The vertical extent of hydrocarbon-impacted ground water is defined to the southwest by <br /> boring B5, and is undefined in all other directions. <br /> • The lateral extent of hydrocarbon-impacted ground water within the GWI water-table zone <br /> is defined to the east by boring B3 and southwest by boring B5,and is undefined in all other <br /> directions (Figure 5). The lateral extent of hydrocarbon-impacted ground water within the <br /> GWII water-bearing zone is defined to the southwest by boring B5, and is undefined in all <br /> other directions (Figure 6). <br /> 5.0. RECOMMENDATIONS <br /> Based on the conclusions presented in this report,AGE recommends the following: <br /> • Performance of additional assessment to define the lateral and vertical extent of petroleum <br /> hydrocarbon-impacted soil and ground water in unknown directions;installation of ground <br /> water monitoring well network to monitor the ground water directional gradient and to define <br /> the dimensions and chemistry of the hydrocarbon plume. <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.Findings were based upon analytical <br /> results provided by an independent laboratory.Evaluation of the hydrogeologic conditions at the site <br /> for the purpose of this investigation was made from a limited number of available data points(e.g., <br /> soil and ground water samples)and subsurface conditions may vary away from these data points.No <br /> other warranty, expressed or implied, is made as to the professional interpretations, opinions and <br /> recommendations contained in this report. <br /> Advanced GeoEnvironmen[al,Inc. <br />