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Frp rs� <br /> 24 July 2000 <br /> AGE-NC Project No 99-0654 <br /> Page 5 of 6 <br /> 41 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> The highest concentrations of petroleum hydrocarbons,TPH-g and fuel additives were detected near <br /> the eastern end of the center UST (sample EN-16') Fuel oxygenating compounds, including methyl <br /> tertiary butyl ether(MTBE), tertiary butanol (TBA) and tertiary-amyl methyl ether (TAME), were <br /> detected in each of the soil samples collected from the site at concentrations as high as 11,000 <br /> micrograms per kilogram (,ug/kg) Total petroleum hydrocarbons quantified as gasoline (TPH-g) <br /> were detected at concentrations up to 12,000 milligrams per kilogram (mg/kg) beneath the western <br /> end of the center UST Iocation Volatile aromatic compounds (benzene, toluene, ethyl benzene and <br /> xylenes BTEX) were detected at concentrations up to 1,800 mg/kg A summary of excavation <br /> analytical results is included as Table 1 <br /> The laboratory reports (MAI Lab I D No 36194 to 36203), quality assurance and quality control <br /> (QA/QC) report and chain-of-custody forms are included in Appendix B <br /> 42 MASS CALCULATIONS <br /> • Based on the hydrocarbon concentration of TPH-g in excavated stockpile soil samples es and highest <br /> concentration of TPH-g in soil at the base of the excavation, an estimated 397 gallons or 1,114 Kg <br /> of gasoline were removed from the site during both the UST removal and soil excavation procedures <br /> The mass and volume calculations are presented in Appendix C <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE finds <br /> • The highest concentrations of petroleum hydrocarbons as gasoline in soil were detected in <br /> samples collected near the eastern portion of the former gasoline UST excavation during <br /> removal of soil underlying the former USTs Lower concentrations of petroleum <br /> hydrocarbons as gasoline were detected in soil samples recovered from the southern portion <br /> of the former UST excavation <br /> • Petroleum hydrocarbons as gasoline were detected in two composite soil samples recovered <br /> from soil stockpiles at the site <br /> • AGE calculates that approximately 397 gallons or 1,114 Kg of gasoline was removed in the <br /> soil excavated dunng the UST removal and interim remediation on the site 1n May 2000 <br />