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i 01 September 2405 AGE-NC Project No 95-0173 IPage 6 of 10 ' Following sample collection,the samples were properly labeled,placed in a covered container, and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL),a DHS-certified laboratories,for analysis Each sample was analyzed within 72 hours of collection for TPH-g,BTEX, Iand MTBE in accordance with EPA Methods 8015M and 8020/8021 ' 3 4 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE REMEDIATION FINDINGS From field and laboratory data collected at the SVE remediation system between 22 December and ' 08 June 2005, AGE determined the average TPH-g concentration and the average flow rate, and calculated the approximate mass and volume of hydrocarbons removed ' 3 4 1 Results of Firstuarter 2005 Soil Vapor Extraction Q P Between 22 December 2004 and 16 March 2005 (first quarter 2005), the SVE remediation system was operational for approximately 2,016 hours (Tables 6 and 7) The IAS system operated ' contemporaneously with the SVE system During this operational period, SVE inlet flow rates were observed to average approximately 84 cubic feet per minute (cfm) calculated from differential pressures observed between 14 and 3 8 inches of water, with induced vacuum measurements ' observed between 40 and 65 inches of water Utilizing a PID, petroleum hydrocarbons were measured at concentrations as high as 227 parts per million (ppm) at regular intervals at the SVE inlet Field measurements are summarized in Table 6 IFirst Quarter 2005 Influent and effluent SVE air flow samples were collected on 02 January, 16 February and 16 March 2005 TPH-g was detected in the January and March influent SVE air flow ' samples at concentrations of 320 µg11 and 420 µg/l, respectively TPH-g was also detected in the January effluent air flow sample at a concentration of 180 µg/l Xylene was detected in both the January and March influent SVE air flow samples at concentrations of 12 µg/l xylenes, no other ' BTEX constituents were detected from first quarter 2005 influent or effluent air samples Analytical results of SVE air samples are summarized in Table 5 The GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix B, the laboratory reports (CTEL laboratory I D 0501-107, 0502-103 and 0503-163), QA/QC reports, and chain of custody forms are presented in Appendix E, a plot of laboratory analyses of SVE influent TPH-g air stream concentrations versus time is included in Appendix F I 3 4 2 Results of Second Quarter 2005 Soil Vapor Extraction Between 16 March and 08 June 2005 (second quarter 2005), the SVE remediation system was ' Advanced GeoEnvironmental,Inc