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{ <br /> I <br /> 10 September 2004 <br /> J AGE-NC Project No 04-1129 <br /> Page 7 of 7 <br /> Ji <br /> • A mass-volume calculation using the data collected during investigation of the former UST <br /> area yields approximately 1,781 gallons ofTPH-d remaining in soil at the site(Appendix D) <br /> • AIthough no record exists to confirm the installation date of the USTs at the site,it appears <br /> ' that the tanks have been place for an extensive period of time Based on the construction <br /> materials and design ofjthe USTs and associated vault, AGE assumes that the tanks were <br /> ' W _ likely Installed a miminum of 60 years ago Review of aerial,photographs Indicates that <br /> 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 ofdetectable concentrations ofTPH=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 down-gradient from the subject site <br /> I <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 f <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 monitonng 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 thus report <br /> i <br /> j <br /> IAdvanced GeAnvironmental,Inc <br />