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' 16 September 2003 <br /> S AGE-NC Project No 96-0229 <br /> ' Page 3 of 5 <br /> ' MW-11 and MW-12 but was approximately 17 and 19 feet above the screen intervals in wells MW-1 <br /> and MW-1013, respectively <br />' The ground water elevation data for monitoring wells MW-2 through MW-12 during the June 2003 <br /> ground water monitoring event is depicted and contoured in Figure 3, elevation data for deep- <br /> screened wells MW-I and MW-I OB were not used to determine ground water gradient because these <br />' elevations may be representative of deeper ground water conditions <br /> The general ground water gradient at the site was calculated to be approximately 0 004 ft/ft or Iess, <br />' or approximately 21 feet per mile, and inferred to be flowing towards the northeast <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of thirteen 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 water samples collected from wells MW-1 through MW-3, MW-6 through <br /> MW-9 and MW-1 OB at concentrations as high as 84,000 micrograms per liter(gg/1)in well MW-2 <br /> Various BTEX constituents were detected in ground water samples collected from MW-1 through <br /> MW-3, MW-5 through MW-9 at concentrations as high as 9,300 99/1 (xylene, MW-6), the highest <br /> benzene concentration was detected in sample MW-I at a concentration of 4,200 gg/l <br />' MTBE was detected by EPA Method 8260B in ground water samples collected from wells MW-I <br /> through MW-3, MW-6, MW-9, MW-10A and MW-1013 at concentrations as high as 860 µg/1 <br /> (MW-6), 1,2-DCA was detected in samples collected from wells MW-1 and MW-2 at concentrations <br /> of 73 gg/l and 4 2 gg/l, respectively, DIPE was detected in a water sample collected from MW-1 at <br /> a concentration of 7 7 µg/l, TAME was detected in a water sample collected from MW-6 at a <br />' concentration of 7 7 gg/I <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 /> summanzed m Tables 3 and 4 1 he laboratory reports(CTEL I D 0306-096-1 through 13)and cham- <br /> of-custody forms are presented in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the findings of the PJune 2003 ground water monitoring went are <br /> Advanced GeoEnviron mental,Inc <br /> 1 <br />