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10 September 2004 <br /> AGE-NC Project No 04-1129 <br />' Page 7 of 7 <br />' A mass-volume calculation using the data collected during investigation of the former UST <br /> area yields approximately 1,781 gallons of TPH-d remaining in soil at the site(Appendix D) <br /> • Although no record exists to confirm the installation date of the USTs at the site, it appears <br />' that the tanks have been in place for an extensive period of time Based on the construction <br /> materials and design of the USTs and associated vault, AGE assumes that the tanks were <br /> likely installed a minimum of 60 years ago Review of aenal,photographs indicates that <br /> I _ operations at the site related to the use of the USTs and the material contained in them were <br /> phased out by the 1970's Therefore,based on the lack of detectable concentrations of TPH-d <br />' in ground water, the relatively shallow vertical limit of TPH-d-impacted soil and relative <br /> immobility of longer chain hydrocarbons, AGE concludes that petroleum hydrocarbons <br /> remaining beneath the site appear to pose minimal risk to human health and beneficial use <br />' of ground water at and dawn-gradient from the subject site <br />' 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 />' 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 an 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(i a monitoring well ground water samples, grab ground <br /> water samples, soil 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 /> I ' <br /> I <br />' Advanced GeoEnviron mental,Inc <br /> y <br />