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13 September 2012 AGE-NC Project No.99-0682 Page 14 of 17 and MW-10 at concentrations between 1,100 pg/I(MW-10)and 44,000 pg/I(MW-8). • BTEX compounds were detected in samples collected from MW-1 A, MW-7, MW-8 and MW-10 at maximum concentrations of 12,000 pg/I benzene, 27,000 pg/I toluene, 3,500 pg/I ethylbenzene and 19,100 pg/I total xylenes (MW-8). • TAME was detected in samples collected from wells MW-7, MW-8 and MW-10 at a concentrations of 2.7 pg/I, 14 pg/I and 2.0 pg/I, respectively. • 1,2-DCA was detected in the samples collected from wells MW-7 and MW-8 at concentrations of 3.4 pg/I and 44 pg/I, respectively. • Various metals were detected in samples collected from wells MW-1A, MW-2, MW-6, MW-7, MW-8, and MW-10; Fe and Al concentrations in well MW-8 remain above baseline concentrations but have decreased compared to the previous sampling event on 05 July 2012; Fe concentrations in MW-1A decreased to non-detect levels. CrVI and Cu were not detected above laboratory reporting limits in the samples collected. However, Cr was detected in the samples collected from well MW-8 at a concentration of 0.025; Cr was detected below the Primary MCL of 0.05 mg/I (Table 4). • Anions (bromate, bromide, chloride, nitrate, nitrate as nitrogen, nitrate as NO3-, sulfate, ammonia, and TDS) were detected in the samples collected from wells MW-1A,MW-6, MW-7, MW-8 and MW-10,with the exception of ammonia from well MW-7. Concentrations of bromate and bromide were detected below baseline concentrations in wells MW-1A and MW-8. Concentrations of bromate and bromide were detected eitherjust above or below baseline concentrations wells MW-6 and MW-7.Additionally, concentrations of chloride and nitrates decreased compared to the previous sampling event in 05 July 2012, but remain above baseline concentrations in samples collected from well MW-8 (Table 5). 4.2.7. Post-ISCO Monitoring Event No. 4: Analytical Results On 19 July 2012, post-ISCO groundwater samples were collected from wells MW-1A, MW- 2, MW-6, MW-8 and MW-10 to evaluate the effectiveness of the ISCO pilot test. The following is a summary of the results: • TPH-g were detected in the samples collected from wells MW-1A, MW-6, MW-8 and MW-10 at concentrations between 190 pg/I (MW-6) pg/I and 140,000 pg/I (MW-8). • TPH-d were detected in the samples collected from wells MW-1A, MW-8 and MW-10 at concentrations between 1,100 pg/I (MW-10) and 27,000 pg/I (MW-1 A). Advanced GeoEnvironmental,Inc.