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N <br /> 'h <br /> z <br /> v ` <br /> 27 September 2005 ' <br /> . AGE-NC Protect No 03-1100 <br /> Page 4 of 4 <br /> S a <br /> Indicating that remediation by SVE is progressing successfully MTBE was not detected in <br /> any of the air flow samples, benzene was detected only once at a concentration of 2 4 µg11, <br /> and detections of remaining BTEX components remained low <br /> • The total mass or volume of petroleum hydrocarbons extracted by the SVE system was <br /> calculated at approximately 2,374.6 pounds or 383.7 gallons, respectively (Table 3) <br /> However, analysis of total TPH-g volume over time suggests that SVE extraction is <br />' approaching asymptotic values due to decreasing concentrations of extractable petroleum <br /> hydrocarbons (Appendix E) <br /> '5.0. 'RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends <br /> • Discontinuation of SVE as a method to remediate petroleum hydrocarbon-Impacted soil <br /> • Advancement of confirmation soil borings to evaluate the mass of impacted soil left in the <br /> subsurface <br /> 6.0. 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 upon <br /> analytical results provided by an independent laboratory Evaluation of the geologic conditions at <br />' the site for the purpose of this investigation was made from a limited number of available data points <br /> and subsurface conditions may vary away from these data points No other warranty, expressed or <br /> implied, is made as to the professional interpretations,opinions and recommendations contained In <br />' this report V <br /> " a ., <br /> , <br /> Y <br /> a <br />' Advanced GeoEnvironmental,Inc <br /> I , <br />