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29 June 2002 <br /> . AGE-NC Project No 97-0326 <br /> Page 3 of 4 <br /> Ground water elevation contours based on the data for the January 2002 monitoring event are <br /> Illustrated on Figure 2 The ground water flow direction was southeast with a gradient of 0 002 ft/ft <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br />' TPH-g was detected in samples collected from MWI through MW3 at concentrations of 60,000 <br /> micrograms per liter (µg11), 55,000 pg/l and 140,000 µg11, respectively Benzene was detected in <br /> samples from MWI through MW3 at concentrations of 2,200 pg/l, 11,000 pg/l and 17,000 pg/l, <br /> respectively Toluene, ethylbenzene and xylenes were detected at concentrations as high as <br /> 20,000 µg/1, 45,000 gg/1 and 24,000 gg/l, respectively(MW3) <br />' MTBE was detected in ground water samples from MW 1 through MW3, the highest concentration <br /> detected by EPA Method 8260B was 630 µg/l In MW3 No other oxygenated compounds were <br /> detected In the samples analyzed <br />' <br /> Analytical results of the ground water samples for the first quarter - 2002 monitoring event are <br /> yt �' p <br /> summarized on Table 2 The laboratory report(CTEL Project No CT214-0201038),QA/QC report <br /> lie <br /> and chain-of-custody form are Included in Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br />' Based on the data collected from the site, AGE finds <br /> • The Inferred ground water flow direction at the site was southeast this quarter, which was <br />' more easterly than the south-southeast flow determined from eight previous monitoring <br /> events The southeast to south-southeast ground water flow direction differs from historical <br /> ground water flow directions at the adjacent site to the east (LISA), and at the Morita <br />' Brothers site at the southeast corner of East Charter Way and Grant Street,which have been <br /> toward the east or northeast <br />' • High concentrations of petroleum hydrocarbons were detected in ground water samples <br /> collected from all three monitoring wells on the site(see Figures 3 to 5) BTEX compounds <br /> and MTBE are at concentrations exceeding California's Maximum Contaminant Levels for <br />' these products in drinking water <br /> • Neither the vertical nor horizontal extent of impacted ground water has been delineated at <br />' the site <br /> • <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />