ARCHIVED REPORTS - OZONE PILOT TEST & SEMI-ANNUAL GROUNDWATER MONITORING REPORT - THIRD QUARTER 2014

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' 20 March 2015 AGE Project No. 00-0769 ' Page 9 of 19 in the same samples at maximum concentrations of 2,300 pg/I benzene, 620 pg/I toluene, 590 pg/I ethylbenzene and 1,760 pg/I total xylenes (MW-4B & MW-513). • 1,2-DCA was detected in groundwater samples from wells MW-413, MW-5B, MW- 6B, and MW-7B at a maximum concentration of 52 pg/I (MW-4B). • TAME was detected in samples from wells MW-413, MW-513, MW-613, and MW-7B at a maximum concentration of 45 pg/l (MW-4B). • No additional analytes were detected above laboratory detection limits in the ' groundwater samples analyzed. HU-3: 140 feet to 160 feet bsq • Depths to groundwater were measured from HU-3 wells MW-4C, MW-5C, MW-6C, MW-7C, MW-8C, and MW-9C and groundwater samples were collected ' from HU-3 wells MW-4C, MW-5C, and MW-6C. • Depths to groundwater ranged between 21.10 feet (MW-8C) btoc and 23.30 feet (MW-5C) btoc (Table 1). Groundwater elevations ranged between 11.54 feet ' (MW-9C) below NAVD88 and 12.44 feet (MW-5C) below NAVD88. • Utilizing HU-3 wells, with the exception of MW-5C, groundwater was inferred to ' be flowing toward the west-northwest under an average hydraulic gradient of approximately 0.001 ft/ft. Figure 5 illustrates contoured groundwater elevations as measured on 04 August 2014. ' • TPH-g were detected in groundwater samples collected from wells MW-4C, MW-5C, and MW-6C at concentrations ranging from 1,200 pg/I in MW-6C to 6,700 pg/I in MW-4C. BTEX compounds were detected in the same samples at ' maximum concentrations of 400 pg/I benzene (MW-5C), 340 pg/I toluene (MW-5C), 230 pg/I ethylbenzene (MW-4C), and 720 pg/I total xylenes (MW-4C). ' • 1,2-DCA and TAME were detected in groundwater samples collected from wells MW-4C, MW-5C, and MW-6C at maximum concentrations of 9.5 pg/I (MW-5C) and 7.1 pg/I, respectively (MW-4C). ' • No additional analytes were detected above laboratory detection limits in the groundwater samples analyzed. ' HU-4: 160 feet to 175 feet bsq ' • Depths to groundwater were measured from HU-4 wells MW-4D, MW-5D, MW-6D, MW-7D, MW-8D, and MW-9D and groundwater samples were collected from HU-4 wells MW-4D, MW-5D, and MW-6D. ' • Depths to groundwater ranged between 22.00 feet (MW-6D & MW-8D) btoc and 23.62 feet (MW-5D) btoc (Table 1). Groundwater elevations ranged between 11.54 feet (MW-9D) below NAVD88 and 12.76 feet (MW-5D) below NAVD88. Advanced GeoEnvironmental Inc.