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1 <br />' 04 April 1997 <br /> i AGE-NC-95-0112 <br />' Page 5 of 5 <br /> • Approximately 1,463 gallons of gasoline was estimated to be in soil prior to remediation, <br />' 240 gallons of gasoline remain after remediation This represents a reduction of 83 6% of <br /> hydrocarbons at the site <br /> • Benzene has not been detected in soil samples collected at the site since remediation began <br /> Toluene was detected in only two of 30 samples collected since remediation began <br /> Ethylbenzene and xylenes were detected in two of eleven samples analyzed from the <br /> February 1997 soil sampling event Therefore, the lighter-range, and more hazardous <br /> hydrocarbons have been remediated at the site <br /> • Geophysical analyses indicate a dense soil of low porosity beneath the site Although <br /> permeability calculations could not be made,these site conditions are generally associated <br /> with soil of lower permeability The potential for future migration of contaminants is <br /> therefore lowered <br /> 42 RECOMMENDATIONS <br /> Based upon data obtained during the February 1997 and previous sampling events, AGE has the <br /> following recommendations <br /> • Computer modeling should be performed to determine the potential for contaminants <br />' remaining in soil to impact ground water <br /> • No additional vapor extraction should be performed at this time <br />' a If the PHS-EHD requires additional vapor extraction, a blower/carbon canister extraction <br /> system should be used <br />' • TPH-g and BTE&X were not detected in ground water samples collected during the January <br /> 1997 monitoring event The next monitoring event should be scheduled for April 1997 to <br /> confirm successful remediation of ground water at the site <br /> 1 <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 mainly <br /> upon analytical results provided byran independent laboratory Evaluation of the geologic conditions - - - <br /> at the site has been made from a limited number of available data points (i a soil borings), and <br /> subsurface conditions may vary through time and with distance from these data points No other <br /> 1 warranty, expressed or implied, is made as to the professional recommendations contained in this <br /> . report <br /> 1 <br />