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•1 1� <br /> 18 June 2004 <br /> AGE-NC-99-0570 <br /> Page 3 of 4 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples MW-2 and MW-3 at concentrations of 4,700 micrograms per liter <br /> (µg/l) and 440 gg/l, respectively TPH-d was detected in sample MW-2 at concentration of <br /> 3,600 gg/l <br /> BTEX compounds were detected at the following maximum concentrations in MW-2, benzene 7 6 <br /> pg/l, toluene 2 8 gg/l, ethyl-benzene 81 gg/l, total xylenes 132 µg/1 No other well had detectable <br /> concentration of BTEX compounds <br /> MTBE was detected in samples MW-2 and MW-3 at 18 gg/l and 110 gg/l, 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 /> 2140102143) QA/QC reports and chain-of-custody form are included in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE draws the following conclusionsvkh41 <<� <br /> • Ground water flow direction was towards the north to northe 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 sampl s,with the highest dissolved concentration <br /> occurring northeast of the dispenser area(MW2f MTBE concentrations in samples MW-2 <br /> and MW-3 were above the DHS'maximum containment level(MCL)of 13 gg/l for drinking <br /> water A o4 <br /> • The benzene concentration detected in sample MW-2 is above the DHS' MCL of 1 0 gg/l <br /> for drinking water <br /> • Concentrations of TPH-g and MTBE increased in wells MW-2 and MW-3 compared to the <br /> previous sampling event, TPH-d and BTEX concentrations also increased in MW-2 While <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, MTBE concentrations in both wells <br /> MW-1 and MW-4 decreased to below reporting limits this quarter <br /> • Advanced GeoEnVlronmental,Inc <br />