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18 November 1998 <br /> �- AGE-NC Project No. 98-0470 <br /> Page 6 of 7 <br /> Laboratory results of soil samples analyzed for petroleum hydrocarbons area summarized in Tables <br /> 1 and 2. The Iaboratory reports (MAI Laboratory ID 92527 to 92533), quality assurance and quality <br /> control (QA/QC) reports and chain-of-custody form is included in Appendix C. <br /> 4.4. HYDROCARBON-IMPACTED GROUND WATER <br /> The results of laboratory analysis of the ground water sample collected at the site over the last <br /> quarter are as follows: <br /> • TPH-g, BTEX and the oxygenated compound MTBE were not detected in water samples <br /> collected during two water sampling events. <br /> • The oxygenated compounds: RIPE, ETBE, MTBE, TAME and TBA were not detected in <br /> the water sample collected on 16 October 1998. <br /> Laboratory results of samples analyzed are summarized in Table 3 and 4. The laboratory reports <br /> (Sequoia ID 5807333-01 and MAI Lab No. 97325) QA/QC reports and chain-of-custody form are <br /> included in Appendix D. <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based upon the results of the subsurface investigation and historical research, AGE concludes: <br /> • Hydrocarbons were detected at moderate concentrations in shallow soil collected from the <br /> former UST area. Hydrocarbon-impacted soil in the area of the forme UST w= iliiillcd to <br /> depths between five and ten feet bsg and limited laterally to the proximity of the UST <br /> — excavation. An estimated 17 onbic yards of impacted soil, with 1.9 gallons of gasoline <br /> remain at the site (Appendix E). <br /> • The ground water in the area of the UST was not effected by the release of petroleum from <br /> the former UST on the site. <br /> 6.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends that certified closure should be <br /> considered for the site. <br /> Advanced GeoEnvironmental,Inc. <br />