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18 September 2003 <br /> • AGE-NC Protect No 96-0254 <br /> Page 3 of 4 <br />' The depths to ground water in wells MW-1 through MW-7 were measured between 7 78 feet and <br /> 8 76 feet below the tops of the well casings Ground water elevations at the site ranged between <br /> 28 42 feet above mean sea level(MSL) in well MW-2A and 29 31 feet above MSL in well MW-6 <br /> I Ground water elevations could not be calculated for wells MW-1, MW-4 and MW-7, these wells <br /> were Installed in June 2003 and have not been surveyed <br /> The ground water flow direction for the 16 July 2003 sampling event was inferred to be toward the <br /> north-northwest at an average hydraulic gradient of 0 003 feet/feet Data from the deeper-screened <br /> well MW-2A was not used to determine the ground water gradient Figure 3 illustrates the contoured <br /> ground water elevations <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in the samples collected from wells MW-lA and MW-4 at concentrations of <br /> 2,800 micrograms per liter (pg/1) and 870 µg/1, respectively TPH-d was not detected in the water <br /> samples collected <br /> Benzene,toluene and xylenes were detected in the ground water samples collected from monitoring <br /> well MW-lA at concentrations of 29 µg/l, 3 0 µg/1 and 61 gg/l, respectively <br /> INo fuel additives, including MTBE were detected in the ground water samples <br /> The analytical results are summarized In Tables 2 and 3 Copies of the laboratory reports (CTEL <br /> Project No CT214-0307065), QA/QC reports and chain-of-custody forms are in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IBased on the data collected during this monitoring period, AGE concludes <br /> • The depth to ground water at the site was between 7 78 feet and 8 76 feet below the well <br /> I casing tops The prevailing ground water flow direction at the site was generally toward the <br /> north, consistent with the previously determined flow directions <br /> • Petroleum hydrocarbon-impacted ground water was encountered in samples from monitoring <br /> wells MW-1A and MW-4 Benzene concentrations exceeded the State of California's <br /> maximum contaminant level (MCL) of 1 gg/1 in the sample collected from wells MW-1A <br /> • MTBE was not detected above laboratory reporting limits in the ground water samples <br /> I <br /> Advanced GeoEnvironmental Inc <br />