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03 October 2003 <br /> AGE-NC Project No 97-0290 <br /> Page 4 of 6 <br /> Additionally, toluene, ethylbenzene and xylenes were detected in sample MW-2 at a maximum <br /> concentration of 690 µg/l <br /> Petroleum hydrocarbons were not detected in the samples collected from wells MW-5 through <br /> MW-8 The fuel additive MTBE was not detected Analytical results of all water samples collected <br /> at the site are summarized on Tables 2 and 3 The laboratory report(MAI Lab ID No 0309036-1 to- <br /> 6), chain-of-custody forms and quality assurance and quality control (QA/QC)reports are included <br /> in Appendix B <br /> 33 ANALYTICAL RESULTS OF SOIL VAPOR SAMPLES <br /> The carbon-SVE unit operated continually,24 hours a day,during the observation period Extraction <br /> flow rates were calculated to have been as high as 53 scfm An induced vacuum(negative pressure) <br /> I of up to 24 inches of water was measured in the piping between the SVE blower and extraction wells <br /> (Table 5) <br /> Hydrocarbon concentrations detected in soil-vapor samples are as reported below <br /> • The influent soil-vapor sample collected on I 1 March contained detectable concentrations <br /> of TPH-g (1,100 µg/1) and the BTEX compounds benzene (0 82 µg/1), toluene (3 7 µg/1), <br /> ethylbenzene (1 0 µg/1) and total xylenes (16 }Lg/1) <br /> • The influent soil-vapor sample collected on 15 April contained detectable concentrations of <br /> TPH-g (1,500 µg/1) and the BTEX compounds benzene (2 0 4g11), toluene (11 µg/l), <br /> ethylbenzene (1 6 µg/1) and total xylenes (34 µg/1) <br /> • The influent soil-vapor sample collected on 13 May contained detectable concentrations of <br /> TPH-g (1,000 µg/1) and the BTEX compounds benzene (1 0 µg/1), toluene (7 7 µg/1), <br /> ethylbenzene (1 8 µg/1) and total xylenes (23 µg/1) <br /> • The influent soil-vapor sample collected on 23 June contained detectable concentrations of <br /> TPH-g (440 µg/1) and the BTEX compounds benzene (0 43 4g/1), toluene (3 2µg11), <br /> ethylbenzene (1 1 µg/1) and total xylenes (17 µg/1) <br /> • The influent soil-vapor sample collected on 24 July contained detectable concentrations of <br /> TPH-g (1,500 µg/1) and the BTEX compounds benzene (2 9 µg/1), toluene (6 5 µg11), <br /> Iethylbenzene (1 7 µg/1) and total xylenes (33 µg/1) <br /> • The influent soil-vapor sample collected on 14 August contained detectable concentrations <br /> of TPH-g (2,000 µg/1) and the BTEX compounds benzene (5 2 µg/1), toluene (9 6 µg/1), <br /> ethylbenzene (2 6 µg/1) and total xylenes (42 µg/1) <br /> Advanced GeoEnviroomental,Inc <br />