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r r30 August 2005 • AGE-NC Project No 96-0229 rPage 4 of 6 r a net ground water flow towards the northeast at hydraulic gradients of approximately 0 004 ft/ft or less (Figure 4) r3 12 Second Water Zone r Ground water elevation data collected in the Second Water Zone (70 to 95 feet bsg) at the site and off-site (wells MW-13 through MW-17 and MW-19) inferred a net ground water flow direction towards the east at hydraulic gradients of approximately 0 005 ft/ft or less (Figure 5) I 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES ' A total of thirty-sixound water les were submitted to Cal Tech Environmental Laboratories �' samples (CTEL), a DHS-certified laboratory in Paramount, California TPH- was detected in round water samples collected from wells MW-1 through MW-3 MW-6 g g p g , MW-9, MW-10 (A and B) and MW-16B at concentrations as high as 200,000 micrograms per liter (µg/1) in well MW-2 BTEX compounds were detected in samples MW-1 through MW-3, MW-6, MW-9 and MW-16B (only xylene detected)at concentrations as high as 93,000µg/l(xylene,MW-2),the highest benzene concentration was detected In sample MW-2 at a concentration of 5,800 µg/1 The fuel additive MTBE was detected by EPA Method 8260 in samples MW-1 through MW-3, MW-6,MW-9,MW-10(A and B)and MW-16(B-C)at concentrations as high as 680 µg/1(MW-3), in addition, 1,2-DCA was detected in the ground water samples collected from wells MW-1,MW-2, MW-9,MW-16B and MW-17A at concentrations of 21 µg/1, 13 µg/l,4 8 µg/l,2 7 µg/l and 3 9 µg/l, respectively No other constituents of concern were detected above laboratory reporting limits In the analyzed samples Previous and current analytical results of ground water monitoring well samples are summarized in Table 3 The laboratory reports (CTEL Project Numbers 0504036 and 0504063), quality assurance/quality control (QA/QC) reports and chain of custody forms are presented in Appendix B GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are Included in Appendix C • Advanced GeoEnvfronmentsl,Inc