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s <br /> — <br /> I f 5 <br /> a � , <br /> • 03 =January 2005 i ti <br /> AGE-NC Project No 95-0142, <br /> Page 3 of 6 - T <br /> Fuel additives di-isopropyl ether DIPE ,ethyl tertiary-butyl ether ETBE ,MTBE, tertiary-2 <br /> amyl methyl ether (TAME), tertiary butan6l (TBA) also In accordance with EPA Method <br /> ` 8260B, and ,f <br />' pH - effluent in accordance with EPA Method 150 1 <br /> }IU , <br /> 3.0. 'FINDINGS <br /> I A el♦ <br /> From field data collected at the S VE remediation system between August and November 2004,AGE <br /> determined the average TPH-g concentration and the average flow rate of hydrocarbons removed -J, <br /> Analytical results of influent ground water samples and ground water extraction measurements were <br /> 4 <br /> used to evaluate the volume of Impacted ground water removed and mass of hydrocarbons treated <br /> * <br /> 31 SOIL-VAPOR EXTRACTION <br /> The SVE unit operated at flow rates ranging between 110 and approximately 115 cubic feet per <br /> minufe(cfm) An induced vacuum(negative pressure)of approximately 25 to 30 inches of water was <br /> measured in the piping between the blower and extraction wells <br /> Hydrocarbon concentrations detected in the soil-vapor samples were as follows <br /> • 16 September TPH-g was detected at 63 micrograms per liter(µg/1),benzene was detected , <br /> ,at 0 31 µg/l, toluene was detdcted at 0 42 µg11 and total xylenes were detected at 1 0 µg/l <br /> • 25 October TPH.g was detected at 150 µg/l, toluene was detected at 1 2 µg/I and total "}I <br /> xylenes were detected'at 0 46 µg/1 <br /> • J 27 and 28 October TPH-g and BTEX compounds were not detected a' <br /> 4 <br />�k 03'November TPH-g was detected at 40 pg/l, toluene was detected at 0 25 µg/1 and total <br /> 1 i <br /> a' xylenes were detected at 0 37 µg/1 <br /> The analytical results are summarized in Table 2 The laboratory reports (MAI Work Orders <br /> ' s 0409254, 0410373, 0410420, 0410450 and 0411075) quality assurance/quality control (QA/QC) <br />' reports and chain of custody forms are included in Appendix B n ' <br /> , <br /> Concentrations of extracted organic vapor measured with the OVM were higher compared to the <br /> analytical results from the soil-vapor samples The highest concentration of organic vapor measured <br /> with the OVM was 308 parts per million by volume (ppmv) <br /> } r <br /> F <br /> Advanced GeoEnvironmental,Inc <br /> t i <br /> , <br /> t <br /> 4 i <br />