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16 June 2003 <br /> AGE-NC Project No 95-0135 <br /> i Page 3 of 4 - ± <br /> I <br /> i' 3.2. LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> r <br /> TPH-g was detected in water samples collected from the monitoring wells MW-1 and MW-2 TPH-g <br /> iwas detected at concentrations as high as 14,000 micrograms per liter(µg/1), in MW-lA <br /> Benzene was detected in samples MW-lA, MW-1B, MW-2A and MW-2B at a maximum <br /> iconcentration of 1,300 µg/1 (MW-1A) Toluene, ethylbenzene and xylenes were detected In the h, <br /> sample MW-lA, MW-2A and MW-2B at maximum concentrations of 40 pg/1 (toluene MW-IA), <br /> i 300µg/1,1(MW-lA) and 140 µg/1 (MW-1A), respectively DIPE was detected in water sample <br /> MW-2A and MW-2B at a concentrations of 36 µg/1 and-2 1 µg/1 MTBE was detected in sample <br /> MW-2B at a concentration of 34 µg/1 t <br /> No other target analytes were detected In the samples analyzed The analytical results of ground <br /> water samples are summarized on Table 2 The laboratory report (CalTech laboratory ID CT214- <br /> i0305134),Quality Control and Quality Assurance(QA/QC)and chain-of-custody are m Appendix C <br /> i. 4.0. SUMMARY/CONCLUSIONS <br /> 4 <br /> The following conclusions were drawn from the results of this investigation <br /> iC During the May 2003 monitoring event, the shallow ground water flow direction at the site <br /> was generally toward the north-northwest Ground water elevation had increased an average <br /> i0 5 feet between the last monitoring event <br /> o The analytical data from samples MW-1 and MW-2 indicated that the highest concentration <br /> iof dissolved hydrocarbons are on the western'portion of the site <br /> Y Monitoring well MW-3 appears to be located beyond the eastern margin of the dissolved , <br /> hydrocarbon plume <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 10 µg/1 in drinking water ' <br /> G The lateral extent of dissolved hydrocarbons is not defined to the north of wells MW-1 and <br /> iMW-2 nor CPT3 <br /> I r , <br />' ' Advanced GeoEnvironmental,Inc <br />