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' 12 May 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 0 004 ft/ft or <br /> less (Figure 4) <br /> I3 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 0 007 ft/ft or less (Figure 5) <br /> I , <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' A total of thirty-five 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 />' MW-9 and MW-10(A and B)at concentrations as high as 81,000 micrograms per liter(µg/1)In well <br /> MW-2 <br /> BTEX compounds were detected In samples MW-1 through MW-4, MW-6 and MW-9 at <br /> concentrations as high as 17,100 µg11 (xylene, MW-2), the highest benzene concentration was <br /> detected In sample MW-i at a concentration of 3,100 µg11 <br /> IThe fuel additive MTBE was detected by EPA Method 8260 In samples MW-1 through MW-4, <br /> MW-6,MW-9,MW-10(A and B),MW-11,MW-16(B-C),and MW-19A at concentrations as high <br /> as 1,100 gg/l (MW-9), In addition, 1,2-DCA was detected In the ground water samples collected <br /> from wells MW-1, MW-2 and MW-17A at concentrations of 220 µg/l, 21 µg11 and 12 µg/1, <br /> respectively <br /> INo 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 Laboratory I D 0412-056), quality <br /> assurance/quality control(QA/QC)reports and chain of custody forms are presented In Appendix B <br /> GeoTracker confirmation pages of the submitted laboratory electronic deliverable format(EDF)files <br /> Iare Included In Appendix C <br /> IAdvanced GeoEnvironmental,Inc <br />