Laserfiche WebLink
_ I <br /> I <br /> 21 June 2002 t <br /> AGE-NC Project No 98-0426 <br /> Page 4 of 5 <br /> 1 4 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES' <br /> I <br /> TPH-g was detected in the ground water samples collected from MW2 and MW3 at concentrations <br /> of 230 micrograms per liter(µg/1) and 210 µg/l, respectively <br /> Benzene was detected in the samples collected from MW3 at a concentration of 4 0 µg/l <br /> Ethylbenzene and xylenes were detected at concentrations as high as 5 3 µg/1 (MW2) and 18 µg/1 <br /> (MW3), respectively <br /> MTBE was detected in the samples collected from MW4 and MW5 at concentrations of 0 64 µg/1 <br /> and 2 1 µg/1;respectively No other fuel oxygenates were detected above laboratory reporting limits <br /> in any of the ground water samples collected <br /> The current and historical ground water analytical results are summarized on Tables 2 and 3 The <br /> laboratory report(MAI Lab IDs 0205185-001 through 0205185-005),chain-of-custody form and the <br /> laboratory QA/QC report are included in Appendix B <br /> s <br /> s <br /> 5 0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected during the second quarter 2002 monitoring event, AGE concludes <br /> • Ground water flow at the site was toward the north-northeast with an average gradient of <br /> 0 003 fl/ft Except for the one reversal in flow direction during the first quarter 2002 <br /> monitoring period, ground water flow has consistently been towards the northeast <br /> • TPH-g was detected in the ground water samples collected from wells MW2 and MW3 at <br />' concentrations of 230 µg/1 and 210 µg/l, respectively, TPH-g concentrations have remained <br /> relatively stable since monitoring began in October 1999 , , <br /> • Benzene (4 0 µg/1)was detected in the sample collected from well MW3, which is slightly <br /> above California's Maximum Contaminant Level (MCL) for benzene of 1 0 µg/1 <br /> Ethylbenzene and xylenes were detected in the samples collected from wells MW2 and <br />' MW3 <br /> • MTBE was detected in the samples collected from MW4 and MW5 at concentrations of <br />' 0 64 µg/1 and 2 1 µg/1, respectively, which are below California's Secondary MCL of <br /> 5 0 µg/1 MTBE has been detected only sporadically at the site since monitoring began in <br /> October 1999 <br />' MTBE and other fuel oxygenates were not detected above laboratory reporting limits in wells <br /> MW1, MW2 and MW3 <br /> Advanced GeoEnvironmental,Inc <br /> I <br /> 1 k , <br />