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r � <br /> 20 July 2000 <br /> AGE Project No. 98-0456 <br /> Page 7 of 7 <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected on 16 March 2000, AGE concludes the following: <br /> • Shallow soil in the area of the waste oil UST has been impacted to a depth of at least ten feet, <br /> but less than 20 feet bsg, by motor oil and diesel and PCE. <br /> • AGE has inferred that 29 cubic yards of soil has been impacted, by a calculated 35.2 Kg of <br /> r- TPH-d and TPH-mo. <br /> • Ground water at the site has impacted with concentrations of TPH-d and PCE that do not <br /> appear to pose a threat to human health or the environment, due to the limited hydrocarbon <br /> mass, limited mobility of the contaminants and `clean' interval of soil above water. <br /> • The assessment of the former gasoline USTs, which operated on the site, did not indicate a <br /> `r release of petroleum hydrocarbons. <br /> • Six domestic ground water well sites were located within or at a 2,000-foot search radius <br /> i• from the site. <br /> 6.0. RECOMMENDATIONS <br /> Based upon data collected from the site, AGE concludes: <br /> The residual soil impacted with petroleum and solvents do not though to pose a significant migration <br /> threat to ground water, exceeding the impact already documented. The overall low risk is based on <br /> the limited mass soil impacted and separation of the impacted soil and ground water. <br /> �- AGE therefore recommends that this site should be considered for closure due to a minimum mass <br /> of hydrocarbon-impacted soil at the site and the low concentration of petroleum in the ground water <br /> at the site. <br /> 7.0. 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 geologic/ <br /> hydrogeologic conditions at the site for the purpose of this investigation are made from a limited <br /> �. number of available data points (i.e. soil samples and water samples) and subsurface conditions may <br /> vary away from these data points. No other warranty, expressed or.implied, is made as to the <br /> professional recommendations contained in this report. <br /> Advanced GeoEnvironmental,Inc. <br /> it <br />