Laserfiche WebLink
I <br /> � r I I It 1 <br /> • s21 June 2002 <br /> AGE-NC Project No 95-013 5 , - <br /> Page 3 of 4 W <br /> + 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in each of the water samples'collected'from the monitoring wells TPH-g was <br /> detected at concentrations as high as 12,000 micrograms Iper liter (gg/1), in MW-1 A <br /> I Benzene was detected in samples MW-IA, MW-1B, MW-2A and MW-2B at a maximum <br /> concentration of 1,000 gg/l (MW-IA) Toluene, ethylbenzene and xylenes were detected in the <br /> sample MW-IA, MW-2A and MW-2B at maximum concentrations of 71 gg/1(toluene in MW-2A), <br /> 280 gg/l (MW-IA) and 140 gg/l (MW-IA), respectively <br /> I , r <br /> DIPE and TBA were detected in water sample MW-2A at,concentrations of 35 gg/l and 57, gg/l, <br /> respectively DIPE, MTBE and TBA were detected in sample MW-2B at concentrations of 3 2 gg/l, <br />' 34 µg11 and 630 gg/l, respectively , <br /> I ! <br /> No other target analytes were detected in the samples analyzed The analytical results of groundwater <br /> samples are summarized on Table 2 The laboratory report(CalTech laboratory 1D 0202-110-Ito-6), <br /> Quality Control and Quality Assurance (QA/QC) and cham-of custody are in Appendix B <br /> 4 0. SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> ` • During the February 2002 monitorng event,the shallow ground water flow direction at the <br /> a site was generally toward the north-northeast Ground water elevation had increased an <br /> average 1 0 feet between the October 2001 and February 2002 monitoring events <br /> • The analytical data from samples MW-1 and MW-2 indicated that the highest concentration <br /> of dissolved hydrocarbons are'on the western portion of the site <br /> ! • Monitoring well MW-3 appears to be located near the eastern margin of the dissolved <br /> hydrocarbon plume <br /> • The lateral extent of dissolved hydrocarbons is not defined to the west, south and north of ' <br /> wells MW-1 and MW-2 <br /> + A <br /> • The fuel additive MTBE was detected in a water sample from well location MW-2, adjacent <br /> to,the.former UST area, the MTBE concentration (34 µg/1) exceeds the State of California <br /> maximum contaminant level of 13 gg/l in dnnkmg water <br /> I <br /> I I I <br /> ^1 <br /> i Advanced GeoEnvirotunentai,Inc <br /> 3 <br /> I <br />