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24 September 2004 <br /> AGE-NC Project No 97-0301 <br /> 1 Page 4 of 6 <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> 1 J <br /> A total of twenty-six (26) ground water samples were submitted to Cal Tech Environmental <br /> ' Laboratories (CTEL), a DHS-certified laboratory, for analysis <br /> TPH-g was detected in two water samples collected from wells MW-1 and MW-7 at concentrations <br /> ' of 5,000 micrograms per liter(µg/1)and 18,000µg/1,respectively The estimated extent of dissolved <br /> TPH-g in the First Water Zone is depicted on Figure 5 For the third consecutive quarterly <br /> monitoring event, TPH-d, TPH-k and TPH-mo were not detected in any of the twenty-six water <br /> ' samples analyzed Various BTEX constituents were detected in the water samples from MW-1 and <br /> MW-7 at concentrations as high as 8,200 µg/1 benzene, 430 µg11 toluene, 1,300 µg11 ethylbenzene <br /> and 4,200 µg/1 total xylenes _ ;4 MW-7, f <br /> ' MTBE was detected in the water sample collected from well MW-1 at a concentration of 7 7 µg11, <br /> 1,2-DCA was detected in the water samples collected from wells MW-1 and MW-7 at concentrations <br /> ' of 8 2 µg/1 and 240 µg/l, respectively <br /> No other fuel components were detected in the ground water samples Previous and current analytical <br /> ' results of ground water monitoring well samples are summarized in Tables 3 and 4 The laboratory <br /> reports(CTEL Proj ect No CT214-0404003 and 0404006)and chain of custody forms are presented <br /> ' in Appendix C, GeoTracker confirmation pages of the submitted laboratory electronic deliverable <br /> format (EDF) files are included in Appendix D <br /> r <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> ' The implications from the March 2004 ground water monitoring event are as follows <br /> • Generally,depth to ground water at the site varied between 31 and 33 feet bsg,ground water <br /> ' elevations ranged between 19 16 feet(MW-SA)and 20 26 feet(MW-11D)below mean sea <br /> level <br /> ' • Grounnwate flow,,,direction for the area bound by First Water Zone wells MW-1 through <br /> MW- bvaelhei <br />