SITE INFORMATION AND CORRESPONDENCE

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F:t?Or-1 AGE NC _209 956 0700 P. 6 04 April 1997 AGE-NC-95-0112 Page 5 of 5 • Approximately 1,463 gallons of gasoline was estimated to be in soil prior to remediation; 240 gallons of gasoline remain after remediation. This represents a reduction of 83.6%of hydrocarbons at the site. • Benzene has not been detected in soil samples collected at the site since remediation began. Toluene was detected in only two of 30 samples collected since remediation began. Ethylbenzene and xylenes were detected in two of eleven samples analyzed from the February 1997 soil sampling event. Therefore, the lighter-range, and more ha7ardou5 hydrocarbons have been remediated at the site. • Geophysical analyses indicate a dense soil of low porosity beneath the site. Although permeability calculations could not be made,these site conditions are generally associated with soil of lower permeability. The potential for future migration of contamimmts is therefore lowered. 4.2. RECOMMENDATIONS Based upon data obtained during the February 1997 and previous sampling events, AGE has the following recommendations: • Computer modeling should be performed to determine the potential for contaminants remaining in soil to impact ground water. • No additional vapor extraction should be performed at this time_ • if the PHS-EHD requires additional vapor extraction, a blower/carbon canister extraction system should be used. • rPH-g and BTE&X were not detected in ground water samples collected during the January 1997 monitoring event. The next monitoring event should be scheduled for April 1997 to Qonfinm successful remediation of ground water at the site. 5.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based mainly upon analytical results provided by an independent laboratory.Evaluation of the geologic conditions at the site has been made from a limited number of available data points (i.e. soil borings), and subsurface conditions may vary through time and with distance from these data points. No other warranty, expressed or implied, is made as to the professional recommendations contained in this report.