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• 19 November 2002 <br /> AGE-NC Project No 01-0865 <br /> Page 4 of 5 <br /> 3 3 ANALYTICAL RESULTS OF SURFACE WATER SAMPLES <br /> TPH-g was detected In the surface water samples collected from the north end of the drainage ditch <br /> (DDN) and from the west end of the Island drainage channel (IDCW) at concentrations of 360 µg/] <br /> and 130 µg11, respectively Toluene and ethylbenzene were detected In the water sample collected <br /> from DDN at concentrations of 30 µg/1 and 2 3 µg/l, respectively and xylene was detected In the <br /> sample from IDCW at a concentration 2 5 µg/1 <br /> MTBE was detected In the surface water sample collected from IDCW at a concentrations of 20µg/1 <br /> No other fuel additives were detected at or above laboratory reporting limits in the surface water <br /> samples Previous and current surface water analytical results are summarized on Table 2 The <br /> laboratory report(CTEL Lab I D No 0210-005-4 through 0210-005-6), QA/QC report and chain- <br /> of-custody <br /> hain- <br /> ofcustody form are Included In Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this Investigation, AGE concludes <br /> • On 27 September 2002, the ground water at the site was Inferred to be flowing toward the <br /> southeast under an average gradient of 0 06 feet/feet <br /> • TPH-g were detected In the ground water sample collected from all three monitoring wells <br /> sampled,TPH-g was detected In samples collected from wells MW-2 and MW-3 for the third <br /> time In the past four quarters, at the highest TPH-g concentrations recorded <br /> • High concentrations of MTBE were detected In the samples from wells MW-2 and MW-3 <br /> and a low concentration of MTBE was detected In the sample collected from MW-4 The <br /> highest concentration of dissolved MTBE occurs In the area of MW-2 and MW-3 An <br /> Isoconcentratlon map Illustrating the approximate distribution of dissolved MTBE Is <br /> depicted on Figure 4 <br /> • TBA was present in sample MW-4 for the second consecutive quarter, at the highest <br /> concentration recorded In addition, the lughest concentration of TAME was recorded this <br /> quarter in the sample from MW-3 <br /> • TPH-g was detected In the surface water samples collected from DDN and IDCW at low <br /> concentrations <br /> • MTBE was detected in the surface water sample collected from IDCW, however, MTBE was <br /> not detected In the sample collected from DDN for the first time In the past seven sampling <br /> events <br /> Advanced GeoEnvironmental,Inc <br />