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13 September 2012 <br /> AGE-NC Project No.99-0682 <br /> Page 11 of 17 <br /> at concentrations between 320 pg/I (MW-6) pg/I and 140,000 pg/I (MW-1A). <br /> • TPH-d were detected in the samples collected from wells MW-1A and MW-7 at <br /> concentrations of 26,000 pg/I and 12,000 pg/1 (MW-7). <br /> • One or more BTEX constituents were detected in samples collected from MW-1A, <br /> and MW-7 at maximum concentrations of 580 pg/I benzene (MW-7), 20,000 pg/I <br /> toluene (MW-1A), 2,400 pg/I ethylbenzene (MW-1 A) and 12,700 pg/I total xylenes <br /> (MW-1A). <br /> • TAME was detected in samples collected from wells MW-1A and MW-7 at a <br /> concentrations of 2.5 pg/I and 5.7 pg/I. <br /> • 1,2-DCA was not detected in samples collected during the 21 June 2012 monitoring <br /> event. <br /> • Various metals were detected in samples collected from wells MW-1A, MW-6, <br /> MW-7, and MW-8; Fe and Al concentrations in well MW-8 decreased compared to <br /> the 07 June 2012 sampling event but were still detected at significant levels <br /> compared to baseline concentrations. Fe remains at a low concentration in well <br /> MW-1A. CrVI and Cr were not detected above laboratory reporting limits in the <br /> samples collected (Table 4). <br /> • Anions (bromate, bromide, chloride, nitrate, nitrate as nitrogen, nitrate as NO3-, <br /> sulfate, ammonia, and TDS) were detected in the samples collected from wells <br /> MW-1A, MW-6, MW-7 and MW-8. Generally, anion concentrations remained <br /> relatively stable in MW-1A, MW-6, MW-7 and MW-8 (Table 5). However, <br /> concentrations of bromide and ammonia in wells MW-1A and MW-8 decreased to <br /> levels below baseline concentrations, and bromate concentrations returned to near <br /> baseline levels. Conversely, concentrations of bromate and bromide in wells MW-6 <br /> and MW-7 continue to be detected above baseline concentrations. <br /> 4.2.4. Post-ISCO Monitoring Event No. 1: Analytical Results <br /> On 28 June 2012, post-ISCO groundwater samples were collected from wells MW-1A, <br /> MW-2, MW-6, MW-7, MW-8 and MW-10 to evaluate the effectiveness of the ISCO pilot <br /> test. The following is a summary of the results: <br /> • TPH-g were detected in the samples collected from wells MW-1A, MW-6, MW-7, <br /> MW-8 and MW-10 at concentrations between 240 pg/I (MW-6) pg/I and 95,000 pg/I <br /> (MW-8). <br /> Advanced GeoEnvironmental,Inc. <br />