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11 August 2004 <br /> • AGE-NC-99-0570 <br /> Page 3 of 4 <br /> - 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples MW-2 and MW-3 at concentrations of 740 micrograms per liter <br /> (µg11) and 200 µg/l, respectively TPH-d was not detected in samples y <br /> BTEX compounds were detected in well MW-2 at concentrations of 2 1 µg/1 benzene,21 µg/1 ethyl- <br /> benzene and 3 0µg/l total xylenes No other well had detectable concentration ofBTEX compounds <br /> MTBE was detected in samples MW-2 and MW-3 at 7 6 µg/l and 170 µg11, respectively <br />' No other target analytes were detected at or above laboratory reporting limits in any of the samples <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in <br /> Table 2 The laboratory reports for the quarterly monitoring event (CTEL Laboratory ID No <br />' 0407019) QA/QC reports and chain-of-custody form are included in Appendix C GeoTracker <br /> confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are- <br /> included in Appendix D -- <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> • Based on the results of the July 2004 monitoring event, AGE draws the following conclusions <br /> � Y"�l�y�dG <br />' Ground water flow direction was towards the north to northwt from the former dispenser <br /> area at a hydraulic gradient of 0 02 feet/feet This flow direction and gradient are similar to <br />' previous monitoring events <br /> • MTBE was detected in two ground water samples, with the highest dissolved concentration <br /> occurring east of the dispenser area(MW-3) MTBE concentrations in samples MW-2 and <br />' MW-3 were above the DHS' primary maximum containment level (MCL) of 13 µg/1 and <br /> secondary MCL of 5 µg11, respectively, for drinking water <br />' The benzene concentration detected in sample MW-2 is near the DHS' MCL of 1 0µg/l for <br /> drinking water <br />' TPH-g remained below reporting limits for the second consecutive sampling event in MW-1 <br /> and decreased to below reporting limits in MW-4,while MTBE concentrations in both wells <br /> MW-1 and MW-4 decreased to below reporting limits this quarter <br />' In Third Quarter 2004, TPH-g, BTEX and MTBE decreased significantly in well MW-2, <br /> whereas TPH-g decreased, but MTBE increased slightly in well MW-3 <br /> I <br /> • <br /> Advanced GeoEnvironmental,Inc <br /> I <br />