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30 July 2003 <br /> AGE-NC Project No 01-0865 <br /> Page 4 of 6 <br /> An Iso-concentration map illustrating the approximate distribution of dissolved MTBE is depicted <br /> on Figure 6 <br /> TAME was detected in the samples collected from wells MW-2, MW-3, MW-6 and EW-1 at <br /> concentrations ranging from 28 µg/1 in MW-6 to 320 11g11 in MW-2 <br /> No other fuel additives were detected at or above laboratory reporting limits in the ground water <br /> samples Previous and current ground water analytical results are summarized on Table 2 The <br /> laboratory report(CTEL Lab ID No 0306-070-1 through 0306-070-10),QA/QC report and chain-of= <br /> custody form are included in Appendix C <br /> 3 3 ANALYTICAL RESULTS OF SURFACE WATER SAMPLES <br /> TPH-g was detected in the surface water samples collected from the east and west ends of the island <br /> drainage channel (II)CE and IDCW) at concentrations of 130 µg/1 and 170 µg/1, respectively <br /> MTBE was detected in the surface water samples collected from IDCW at a concentration of <br /> 160 µg/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 ID No 0306-070-11 and 0306-070-12), QA/QC report and chain-of- <br /> custody <br /> hain-ofcustody form are included in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes <br /> • The ground water flow direction of first ground water on 11 June 2003 was inferred to be <br /> towards the southeast under an average ground water gradient of 0 040 feet/feet(Figure 3) <br /> The ground water flow Inferred from the deep-screened (50 feet to 60 feet bsg) wells was <br /> northeast but under a much shallower average gradient of 0 002 feet/feet (Figure 4) <br /> • TPH-g was detected in the ground water samples collected from MW-2 through MW-6 and <br /> EW-1, TPH-g concentrations Increased compared with data from the previous quarters <br /> • One or more BTEX compounds were detected in the samples from wells MW-3, MW-4, <br /> MW-6 and EW-1 Benzene and toluene were detected at concentrations above Califomia's <br /> • Maximum Contaminant Levels (MCLS) <br /> Advanwd GeoEnvironmentai,Inc <br />