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02 May 2013 <br />AGE-NC Project No. 99-0559 <br />Page 3 of 5 <br />One or more benzene, toluene, ethyl-benzene, and total xylenes (BTEX) <br />compounds were reported in wells MW-1, MW-2, MW-3, MW-4, MW-5A and <br />MW-7A above the minimum detection levels of the analysis procedures. BTEX <br />maximum concentrations were reported in well MW-2 at 240 pg/I (benzene), 25 pg/I <br />(toluene), 680 pg/I (ethyl-benzene) and 422 pg/I (total xylenes). <br />The fuel additive methyl tertiary-butyl ether (MTBE) and/or tertiary butyl ether (TBA) <br />contaminants were reported in wells MW-2, MW-3, MW-4, MW-5A, MW-7A and <br />MW-12 at maximum concentrations of 1,000 pg/I (MTBE [MW-4]) and 2,300 pg/I <br />(TBA [MW-7A]), respectively. <br />HU3 and HU4: <br />Depths to groundwater ranged from 48.50 feet btoc (MW-11) to 50.00 feet btoc <br />(MW-6B). Groundwater elevations ranged between 24.06 feet (MW-11) and 24.60 <br />feet (MW-6B) below NAVD88; an average decrease of 0.62 feet since the last <br />monitoring event. <br />Groundwater was inferred to be flowing toward the southeast at a gradient of <br />0.003 ft/ft (Figure 4). <br />TPH-g were reported in groundwater samples collected from wells MW-5B, MW-7B <br />and MW-11 at a maximum concentration of 3,900 pg/I (MW-7B). <br />One or more BTEX compounds were reported in wells MW-5B and MW-7B at <br />maximum concentrations in well MW-7B of 450 pg/I (benzene), 1,200 pg/I (toluene), <br />160 pg/I (ethyl-benzene) and 780 pg/I (total xylenes). <br />Fuel additive MTBE, TBA and/or t-amyl methyl ether (TAME) were reported in <br />intermediate wells MW-5B, MW-7B and MW-11 at maximum concentrations of <br />760 pg/I (MTBE [MW-11), 1,300 pg/I (TBA [MW-5B]) and 14 (TAME [MW-713]). <br />No additional analytes were reported at or above laboratory detection limits in the <br />groundwater samples analyzed. Analytical results of current and historical groundwater <br />samples are summarized in Table 2. The Laboratory report (CTEL Project No. CT214- <br />1212100), quality assurance and quality control (QA/QC) reports and chain of custody <br />forms are included in Appendix D. Electronic deliverable format (EDF) files and depth-to- <br />water data were uploaded to the State GeoTracker database under confirmation numbers <br />9517490446 and 9908586025. <br />Advanced GeoEnvironmental, Inc.