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12 August 2009 <br /> AGE-NC Project No. 08-1633 <br /> Page 5 of 5 <br /> samples collected from boring B8, which is approximately sixty feet from the suspected <br /> source area. The lateral extent of impacted soil is not defined east of the AST area. <br /> • The vertical extent of TPH-d impacted soil is not currently defined in the immediate area of <br /> the dispenser islands as well as to the east of the release area, as illustrated in Figure 3. <br /> • Free-phase product(diesel)was present in grab ground water samples collected from borings <br /> B3 and B6. Near pure product (98% TPH-d) was present in the ground water sample <br /> collected from boring. The free-product phase appeared concentrated above the water table <br /> and was generally emulsified with the water after the sample was collected. <br /> • The vertical and lateral extent of TPH-d impact to ground water is not defined in all <br /> directions surrounding the suspected source area. <br /> Additional lateral and vertical assessment will be required to determine the extent of impacted soil <br /> and ground water. <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends: <br /> • Performance of additional site assessment of soil and groundwater at the site.Additional soil <br /> and ground water sampling will be required to determine the lateral and vertical extent of <br /> impacts. <br /> • Source removal of the impacted soil. In an effort to reduce continual leaching to ground <br /> water and the lateral migration of contaminants, a limited excavation of the area in the <br /> immediate vicinity of the release is warranted to remove the significantly-impacted soil. <br /> 6.0. LINIITATIONS <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 geologic and hydrogeologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points(i.e.,soil and groundwater samples)and subsurface conditions may vary away <br /> from these data points. No other warranty, expressed or implied, is made as to the professional <br /> interpretations, opinions, and recommendations contained in this report. <br /> Advanced GeoEnvironn ental,Inc. <br />