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z ' <br /> 08 August 2005 <br /> AGE-NC Project No 98-0534 <br />' Page 15 of 15 <br />' • A volume-mass calculation of the remaining petroleum hydrocarbon impacted soil at the site <br /> yields an approximate volume of 318 cubic yards Mass-volume calculations indicate that <br /> an estimated 2 3 gallons of adsorbed petroleum remain In soil The dissolved volume-mass <br />' calculation using the data collected from the most recent ground water monitoring event <br /> demonstrates that a mass of 0 14 kg or 0 3 lbs of dissolved MTBE remains near the former <br /> UST area <br />' O <br /> • Based on depth to ground water measurements observed at the site from August 2000 to June <br /> 2005,any remaining residual TPH-impacted soil, which was significantly impacted,is at or M7 <br /> above the maximum ground water elevations recorded during the monitored period <br /> • AGE concludes that petroleum hydrocarbons remaining beneath the site appear to pose <br /> minimal risk to human health and beneficial use of ground water down-gradient or near the <br />' subject site <br /> 1 7.0. RECOMMENDATIONS <br />' • Based upon data collected from the site, AGE recommends the following <br /> No further subsurface investigation at this time <br /> • Consideration of the facility for closure as a low risk ground water site <br /> • Destruction of wells in accordance with applicable regulations as part of the site closure <br /> preparations <br />' 8.0. 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 by all 'independent laboratory -Evaluations of the <br />' geologic/hydrogeologic conditions at the site for the purpose of this investigation were made from <br /> a limited number of available data points(1 a monitoring well ground water samples,soil samples), <br /> and subsurface conditions may vary away from these data points No other warranty, expressed or <br />' implied, is made as to the professional recommendations contained in this report <br />' Advanced GeoEnvironmental,Inc <br /> I <br />