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23 August 2012 AGE-NC Project No. 96-0236 Page 3 of 4 • Tertiary amyl ether (TAME) was detected in ground water samples collected from wells MW-10B, MW-12, MW-13, MW-14, MW-16, MW-19, DPE-1 and DPE-2 at concentrations as high as 92 pg/I (MW-10B). • No additional analytes were reported at or above laboratory detection limits in the ground water samples analyzed from the site. Analytical results of water samples collected in June 2012 are summarized in Table 2. The laboratory report (CTEL Lab Project. No. CT214-1206168), quality assurance/quality control report,and chain-of-custody form are included in Appendix C. Electronic deliverable format (EDF) files and depth-to-water data were uploaded to the State GeoTracker database (confirmation numbers are 5083251237 and 3276748597). 4.0. CONCLUSIONS The implications from the June 2012 ground water monitoring event are as follows: • The ground water elevation was above the screened intervals of HU1 wells MW 1 A, MW-7 and MW-8, yet should yield samples representative of shallow ground water conditions. The ground water elevations observed at HU2 and HU4 wells should yield samples representative of deeper ground water conditions. The ground water flow directions were consistent with seasonal variations observed during previous monitoring events. • HU1 ground water flow directions were oriented towards the northeast, while HU2 ground water flow direction was oriented toward the southwest. HU4 ground water flow direction was oriented toward the east. • TPH-g concentrations reported DPE-1 and DPE-2 have increased since pilot injections were performed at the site. However, based on historically reported concentrations it appears that application of the hydrogen peroxide solutions in the wells was successful at lowering hydrocarbon concentrations overall (Table 2). • Although monitoring well MW-4 was not mpled d ring the June 2012 monitoring, based on historical analytical results, w II MW-4 r ains in the core area of the HU1 dissolved plume and is likely impa tecj_� significant concentrations of hydrocarbon constituents. • Hydrocarbon constituents were reported for the third straight monitoring event in downgradient/cross gradient HU1 well MW-7. Concentrations decreased as compared to the December 2011 monitoring event and the well's location appears to mark the downgradient/cross gradient northern edge of the HU1 plume. Advanced Geo Environmental,Inc.