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15 September 2005 <br /> (• AGE-NC Project No 96-0229 <br />' Page 4 of 6 <br /> a net ground water flow towards the northeast at hydraulic gradients of approximately 0 003 ft/ft or <br /> less (Figure 4) <br /> r3 12 Second Water Zone <br />' Ground water elevation data collected in the Second Water Zone (70 to 95 feet bsg) at the site and <br /> off-site (wells MW-13 through MW-17 and MW-19) inferred a net ground water flow direction <br /> towards the east at hydraulic gradients of approximately 0 006 ft/ft or less (Figure 5) <br /> 32 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of forty-one ground water samples were submitted to Cal Tech Environmental Laboratories <br /> (CTEL), a DHS-certified laboratory in Paramount, California <br /> TPH-g was detected in ground water samples collected from wells MW-1 through MW-3 MW-6 <br /> p g > <br /> • MW-9 and MW-16C at concentrations as high as 27,000 micrograms per liter(µg/1)in well MW-2 <br /> BTEX compounds were detected in samples MW-1 MW-2 MW-3,p 3, MW-4 (only xylene detected) <br /> MW-6 and MW-9 at concentrations as high as 12,800 µg/1 (xylene, MW-6), the highest benzene <br /> concentration was detected in sample MW-1 at a concentration of 2,000 µg/1 <br /> The fuel additive MTBE was detected by EPA Method 8260 in samples MW-1, MW-2 MW-4, <br /> MW-6,MW-9,MW-1 OB,MW-11,MW-16(A-C),MW-18B and MW-19A at concentrations as high <br /> as 96 µg/l (MW-16C), in addition, 1,2-DCA was detected in the ground water samples collected <br /> from wells MW-1, MW-2, MW-3, MW-6, MW-9, MW-1OB, MW-16C, MW-17A, MW-18 (B-C) <br /> and MW-19A at concentrations ranging between 2 5 µg/1 (MW-17A) and 60 µg/1 (MW-1) <br /> No other constituents of concern were detected above laboratory reporting limits in the analyzed <br /> samples Previous and current analytical results of ground water monitoring well samples are <br /> summarized in Table 3 The laboratory reports (CTEL Protect Numbers 0506194 and 0506201), <br /> quality assurance/quality control (QA/QC) reports and chain of custody forms are presented in <br /> Appendix B Geo i racker confirmation pages of the submitted laboratory electronic deliverable <br /> format(EDF) files are included in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the findings of the June 2005 round water monitoring event are <br /> p g 8 g <br /> IAdvanced GeoEnvironmental,Inc <br />