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01 September 2005 <br /> AGE-NC Project No 95-0173 <br /> IPage 4 of 10 <br /> 2 4 2 Laboratory Results of Ground Water Samples 30 November 2004 <br /> A total of nineteen ground water samples were submitted to CAL for analysis TPH-g was detected <br /> in ground water samples MW-2, MW-4 and MW-13 (A-C) at concentrations as high as 1,000 <br /> micrograms per liter (µg/l) from MW-4 <br /> Various BTEX compounds were detected in ground water samples MW-1, MW-2, MW-4 and <br /> MW-13 (A-C) at concentrations as high as 190 µg/l (toluene, MW-2) The maximum benzene <br /> concentration was detected in sample MW-13A at a concentration of 43 [Ig/l <br /> 1,2-DCA was detected from MW-2 at a concentration of 20 pg/l No other fuel components were <br /> detected in the samples analyzed Previous and current analytical results of ground water samples <br />' are summarized in Tables 3 and 4,respectively The GeoTracker confirmation pages of the submitted <br /> laboratory electronic deliverable format (EDF) files are included in Appendix B, the laboratory <br /> report (CTEL Laboratory I D 0505-152), quality assurance/quality control (QA/QC) reports, and <br />' chain of custody forms are presented in Appendix C <br />'. 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM AND RESULTS <br />' Between 22 December and 08 June 2005 (first and second quarters 2005), an SVE remediation <br /> system was continuously operated at the site, utilizing a regenerative vacuum blower to selectively <br /> apply an induced vacuum to wells VW-1 through VW-7 (see Table 6) During this time, IAS <br /> remediation was selectively operated on IAS wells AW-1B (screened 50 feet to 60 feet bsg) and <br /> AW-2B (screened 60 feet to 70 feet bsg)utilizing an air compressor to infect air beneath the water <br /> table SVE and IAS procedures for the site were described in the AGE-prepared Remedial Action <br />' Work Plan, dated 30 December 1998 and approved by the EHD by letter dated 20 April 1999 <br /> On 05 April 2005, AGE performed an SVE carbon change-out at the site by replacing the original <br />' two 1,000-pound carbon media vessels with 2,000 pounds of imported coconut shell, vapor phase <br /> activated carbon <br /> 3 1 REMEDIATION SYSTEM PROCEDURES <br />' The SVE system utilized a manifold network of 2-inch diameter, schedule 80 polyvinylchloride <br /> (PVC)piping installed underground from SVE wells VW-1 through VW-7 to the inlet of the SVE <br /> remediation system The SVE remediation system is comprised of one 4'/2-horsepower,regenerative <br /> vacuum blower and two 1,000-pound carbon canisters <br /> Advanced GeoEnvironmental,Inc <br />