ARCHIVED REPORTS_XR0009086 - Laserfiche WebLink

Home Browse Search

1 07 March 2003 AGE-NC Protect No 98-0540 Page 3 of 4 IBTF&X compounds were detected in samples MW-1 and MW-3 at concentrations as high as 10 µg/1 (benzene, MW-1), 16 gg/1 (toluene, MW-1), 5 6 gg/1 (ethylbenzene, MW-3) and 550 µg/l (xylenes, MW-3) The fuel additive 1,2-DCA was detected in the samples collected from MW-1 and MW-3 at concentrations of 18 gg/1 and 130 g&/I, respectively No other target analytes were detected above laboratory reporting limits in samples MW-1 through MW-3 1=n addition,no target analytes were detected above laboratory reporting limits in the ground water samples collected from the ori-and off-site domestic wells Analytical results of ground water samples are summarized on Table 2 Copies of the laboratory report (MAI Lab IDs 0301013-001 Ithrough 0301013-005) and chain-of-custody forms are in Appendix B 4.0. SUMMARY AND CONCLUSIONS Based upon data collected from the site, AGE concludes the following lie • The in aximum g round w ater g radient w as 0 003 f t/ft w ith a f low d irection t oward t he southeast, and was consistent with the gradient and flow direction from the last monitoring I event Target analytes were not detected above laboratory :.poring limits n the ground water samples collected from the on- and off-site domestic wells • TPH-g, various BTE&X compounds and 1,2-DCA were detected in ground water samples collected from MW-1 and MW-3 The 1,2-DCA concentration detected in the samples collected from MW-1 and MW-3 exceeded the State of California's Maximum Contaminant Level (MCL) of 0 5 gg/1 • MTBE and other oxygenated fuel additives were not detected above laboratory reporting limits in any of the ground water samples + The highest concentrations of dissolved petroleum hydrocarbons were to the area(MW-1) Ior down-gradient (MW-3) of the former UST • The lateral extent of dissolved petroleum hydrocarbon-impacted ground water has not been fully delineated I - Advanced GeoEnvironmental,Inc