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16 January 2001 <br /> • AGE-NC Project No 97-0290 <br /> Page 4 of 6 <br /> laboratory report (AAL Order No A0011 1411 and A00111510), chain-of-custody forms and quality <br /> assurance and quality control (QA/QC) reports are included in Appendix B <br /> 33 SOIL-VAPOR EXTRACTION <br />' The SVE unit operated at varying rates during the observation period Extraction flow rates were <br /> calculated to range from 65 to approximately 80 scfm Typically, operation of the SVE averaged 70 <br /> scfm during the period An induced vacuum (negative pressure) of approximately 30 inches of water <br /> was measured in the piping between the blower and extraction wells An induced vacuum of <br /> approximately 0 05 inches was measured at well MW- 2, a distance of 10 feet from the extraction <br /> well VW-1 (Tables 4) <br /> The SVE unit experienced adequate operation over the quarter, however the overall operational <br /> capacity of the unit has been limited due to either low oxygen content and/or high carbon dioxide <br /> levels in the influent vapor Several re-start-up were preformed over the quarter During the month <br /> of August the SVE unit did not operate due to on-sate construction <br /> lieHydrocarbon concentrations detected in influent soil-vapor samples were as follows <br /> C 05 October 2000 TPH-g was detected at 16,000 µg11, benzene at 59 4g/l, toluene at 140 <br /> ug/l, ethylbenzene at 44 4g11 and total xylenes at 190 µgll <br /> C 20 October 2000 TPH-g was detected at 20,000 µg/l, benzene at 74µg/l toluene at 130 µg/l, <br /> ethylbenzene at 43 µg/1 and total xylenes at 120µg/1 <br /> • 27 November 2000 TPH-g was detected at 29,000 ,ug/l, benzene at 63µg/l toluene at 220 <br /> µg/l, ethylbenzene at 72 µg/1 and total xylenes at 350 Mcg/l <br /> • 21 December 2000 TPH-g was detected at 21,000 µg/l, benzene at 43µg/l toluene at 180 <br /> µg11, ethylbenzene at 68 µgll and total xylenes at 380 peg/l <br /> The analytical results are summarized on Table 5 The laboratory reports (MAI Sample Numbers <br /> 49836, 51020, 51021, 54320, 54321, 56708 and 56709) Quality Assurance and Quality Control <br /> (QA/QC) reports and chain-of-custody forms are included in Appendix C <br /> Hydrocarbon concentrations measured in samples from the effluent stream indicated a minimum 95- <br /> percent rate of destruction <br /> Concentrations of extracted organic vapor measured with the OVM were low compared to TPH-g <br /> • analytical results from soil-vapor samples The highest concentration of organic vapor measured with <br /> the OVM was 127 ppm <br /> Adi,anced CeoLnrironmentAl,inc <br />