Laserfiche WebLink
1 <br /> 1 • 24 March 2001 <br /> AGE-NC Protect No 98-0511 <br />' Page 3 of 4 <br />' 5 and MW-8 had BTEX compounds at concentrations exceeding the California maximum <br /> contaminant levels (MCLs) for drinking water <br />' MTBE was detected by EPA Method 8020 in the ground water sample collected from MW-5 at a <br /> concentration of 190 µg/1 MTBE was detected by EPA Method 8260 in the ground water samples <br /> collected from MW-3 and MW-5 at concentrations of 2 7 µg/l and 170 µg/1 respectively No other - <br />' fuel oxygenated compounds were detected at concentrations above laboratory reporting limits <br /> Analytical results of ground water samples are summarized on Table 2 The laboratory report(MAI <br /> Laboratory ID 57468-57475) and chain-of-custody forms are included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IBased upon data collected from the site, AGE concludes the following <br /> • The ground water gradient was calculated to range from less than 0 003 ft/ft to 0 008 ft/ft, <br /> • the ground water flow direction appears to be generally northwestward, varying from west <br /> to north towards the low-water elevation point around monitoring well MW-5 <br /> • TPH-g was detected in the sample collected from new monitoring well MW-5 <br /> • Lower concentrations ofTPH-g and BTEX compounds were detected in sample MW-I than <br /> in previous quarterly monitoring events, but fall within the range of concentrations <br /> previously detected <br /> • BTEX compounds were detected in all of the ground water samples,however,only samples <br /> I MW-1, MW-4, MW-5 and MW-8 had BTEX concentrations exceeding maximum <br /> contaminant levels (MCLS) for California drinking water <br /> • The various BTEX compounds detected in samples from MW-2,MW-3,M$-4,MW-6,MW- <br /> 7 and MW-8 and the TPH-g detected in the sample from MW-4 may be the result of cross <br /> contamination <br /> • MTBE was detected at concentrations as high as 190 µg/1 in the sample from monitoring <br /> well MW-5, exceeding both the State of California's secondary MCL of 5 µg/1 and the State <br /> of California's action level of 13 µg/1 <br /> • <br /> Advanced GeoEnviranmental,Inc <br />