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01 October 2013 <br />AGE Project No. 99-0559 <br />Page 3 of 6 <br />One or more benzene, toluene, ethyl-benzene, and total xylenes (BTEX) <br />compounds were detected in samples collected from wells MW-1, MW-2, MW-3, <br />MW-4, MW-5A and MW-6A at maximum concentrations of 1,200 pg/I (benzene), <br />8.5 pg/I (toluene), 160 pg/I (ethyl-benzene) 1,220 pg/I (total xylenes) in well MW-2. <br />The fuel additive methyl tertiary-butyl ether (MTBE) and tertiary butyl ether (TBA) <br />were reported in wells MW-2, MW-3, MW-4, and MW-5A at maximum <br />concentrations of 4,000 pg/I MTBE (MW-4) and 5,800 pg/I TBA (MW-4). <br />Ethyl tertiary butyl ether (ETBE) was detected in groundwater samples collected <br />from wells MW-2, MW-3, MW-4, and MW-5A at a maximum concentration of 18 pg/I <br />in well MW-5A. <br />Tertiary amyl methyl ether (TAME) was detected in groundwater samples collected <br />from wells MW-2 and MW-4 at a maximum concentration of 5.6 pg/I in well MW-4. <br />1,2-Dichloroethane (1,2-DCA) was detected in groundwater samples collected from <br />wells MW-2 and MW-3 at a maximum concentration of 21 pg/I in well MW-2. <br />HU3 and HU4: <br />Depths to groundwater ranged from 54.70 feet btoc (MW-5B) to 55.50 feet btoc <br />(MW-6B). Groundwater elevations ranged between 30.02 feet (MW-7B) and 30.10 <br />feet (MW-6B) below NAVD88 indicating an average decrease of 5.61 feet since the <br />previous monitoring event in December 2012. <br />Groundwater was inferred to be flowing toward the south-southeast at a gradient of <br />0.001 ft/ft (Figure 4). <br />TPH-g were detected in groundwater samples collected from wells MW-5B, MW-6B, <br />and MW-7B at a maximum concentration of 4,000 pg/I (MW-7B). <br />BTEX compounds were detected in samples collected from wells MW-5B, MW-6B <br />and MW-7B at maximum concentrations in well MW-7B of 280 pg/I (benzene), <br />700 pg/I (toluene), 140 pg/I (ethyl-benzene) and 570 pg/I (total xylenes). <br />MTBE was detected in samples collected from MW-5B, MW-6B and MW-7B at a <br />maximum concentration of 160 pg/I (MW-5B); ETBE was detected in samples <br />collected from MW-5B and MW-6B at a maximum concentration of 13 pg/I <br />(MW-5B); and 1,2-DCA was detected in the samples collected from well MW-7B at <br />a concentration of 6.7 pg/I. <br />Upper HU5/Lower HU5: <br />Depths to groundwater ranged from 54.80 feet btoc (MW-5C) to 55.59 feet btoc <br />,4thanced GeoEnvironmental, Inc.