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25 January 2012 <br />AGE-NC Project No. 02-0926 <br />Page 5 of 7 <br />BTEX compounds were detected at concentrations of 27,000 pg/I benzene, <br />29,000 pg/I toluene, 2,200 pg/I ethylbenzene, and 12,900 pg/I, respectively. <br />TAME, 1,2-DCA and EDB were detected at concentrations of 75 pg/I and 240 pg/I <br />and 130 pg/I, respectively. <br />Post IAS Pilot Test Ground Water Sampling: 22 December 2011 <br />TPH-g were detected at a concentration of 110,000 micrograms per liter pg/I; <br />BTEX compounds were detected at concentrations of 22,000 pg/I benzene, <br />34,000 pg/I toluene, 3,800 pg/I ethylbenzene, and 23,600 pg/AI respectively. <br />/kyle <br />TAME, 1,2-DCA and EDB were detected at concentrations of 45 pg/I and 260 pg/I <br />and 61 pg/I, respectively. <br />No additional analytes were reported at or above laboratory detection limits in the ground <br />water samples analyzed during the December 2011 IAS pilot test. Analytical results are <br />summarized in Table 6. The laboratory reports (Cal Tech Environmental Laboratory Lab <br />Project. No. 1112134 and 1112160), quality assurance/quality control report, and chain-of- <br />custody form are included in Appendix C. Depth to water and laboratory analytical data <br />were uploaded to the State GeoTracker database under confirmation numbers <br />9327646911 and 7441853344. <br />5.0. CONCLUSIONS <br />Based on field data and laboratory analytical data from the December 2011 IAS pilot test, <br />AGE concludes the following: <br />Between 19 and 22 December 2011, an electric air compressor and the onsite SVE <br />system were utilized for the performance of a 72-hour IAS pilot test. Approximately <br />15.5 to 16 psi of pressure was applied throughout the pilot test at well MW-6 <br />(screened 70 to 75 feet bsg). Sparged soil vapors were recovered throughout the <br />test utilizing the site SVE system and well VW-1. <br />Prior to initiation of the pilot test, baseline ground water samples were collected <br />from site well MW-5 to evaluate the short-term effects of IAS on shallow impacted <br />ground water at the site; additionally, baseline depth to water and dissolved oxygen <br />measurements were collected from observation wells MW-1 through MW-5. TPH-g <br />and BTEX concentrations reported during the baseline sampling event were <br />significantly lower than historical concentrations reported during periodic monitoring <br />Advanced GeoEnvironmental, Inc.