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- 1 <br />' 06 November 2002 <br /> • AGE-NC Project No 98-0540 <br />' Page 3 of 4 <br />' 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in the ground water samples collected from MW-1 and MW-3 at concentrations <br />' of 140 micrograms per liter (µg/l) and 280 µg/1, respectively(Table 2) <br /> Toluene was detected in the samples collected from well MW-1 at a concentration of 12 µg/1, <br />' ethylbenzene was detected in the samples from MW-1 and MW-3 at concentrations of 3 0 µg/l and <br /> 2 1 µg/1, respectively, total xylenes were detected in the samples from MW-1 and MW-3 at <br /> concentrations of 6 2 µg/1 and 11 µg/1, respectively <br />' The fuel additive 1,2-DCA was detected in the samples collected from MW-1 and MW-2 at <br /> concentrations of 11 µg/1 and 73 µg/l, respectively <br />' No other target analytes were detected above laboratory reporting limits in samples MW-1 through <br /> MW-3, in addition,no target analytes were detected above laboratory reporting limits in the ground <br /> water sample collected from the on-site domestic well Analytical results of ground water samples <br /> are summarized on Table 2 Copies of the laboratory report (CTEL Laboratory IDs 0209-035-1 <br /> through 0209-035-4) and chain-of-custody forms are in Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> • The maximum ground water gradient was 0 005 ft/ft with a flow direction toward the east- <br /> southeast, and was consistent with the gradient and flow direction from the last monitoring <br /> event <br /> • TPH-g, various BTEX compounds and 1,2-DCA were detected in ground water samples <br /> collected from MW-1 and MW-3 The 1,2-DCA concentration detected in the samples <br /> collected from MW-1 and MW-3 exceeded the State of California's Maximum Contaminant <br /> Level (MCL) of 0 5 µg/1 <br /> • MTBE and other oxygenated fuel additives were not detected above laboratory reporting <br /> limits in any of the ground water samples <br /> • The highest concentrations of dissolved petroleum hydrocarbons were in the area(MW-1) <br />' or down-gradient (MW-3) of the former UST <br /> • The lateral extent of dissolved petroleum hydrocarbon-impacted ground water has not been - <br /> fully delineated <br /> Advanced GeoEnvironmental,Inc <br /> �1 <br /> r <br /> Y <br />