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28 February 2003 <br /> AGE-NC Project No 95-0135 <br />' Page.3 of 4 <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in water samples collected from the monitoring wells MW-1 and M W-2 TPH=g _ <br />' was detected at concentrations as high as 7,100 micrograms per liter (µg/1), in MW-1A <br /> Benzene was detected an samples MW-1A, MW-1B, MW-2A and MW-2B at a maximum <br />' concentration of 1,100 µg/1 (MW-1A) Toluene, ethylbenzene and xylenes were detected in the <br /> sample MW-1A,MW-2A and MW-2B at maximum concentrations of 66 µg/1(toluene in. MW-2A), <br />' 550 µg/1(MW-1A) and 208 µg/l(MW-IA), respectively DIPE was detected in water sample MW- <br /> 2A at a concentration of 30 µg/l MTBE was detected in sample MW-2B at a concentration of <br /> 29 µg/l <br /> No other target analytes were detected in the samples analyzed The analytical results o(ground water <br /> samples are summarized on Table 2 The laboratory report(CalTech laboratory ID 0302-027-1 to-6), <br />' Quality Control and Quality Assurance (QA/QC) and chain-of-custody are an Appendix C <br /> lie 4.0. SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> Duron the January 2003 monitoring event the shallow groundwater flow direction at the site <br /> ° g �' g � � <br /> was generally toward the north-northeast Ground water elevation had decreased an average <br /> j 1 5 feet between the last two 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 beyond the eastern margin of the dissolved <br />' hydrocarbon plume _ <br /> • The fixel additive MTBE was detected an a water sample from well location MW-2, adjacent <br /> to the former UST area, the MTBE concentration(29 µg/1) exceeds the State of California <br /> maximum contaminant-level of 10 µg/1 an drinking water <br /> • The lateral extent of dissolved hydrocarbons is not defined to the north of wells MW-1 and <br />' MW-2 nor CPT3 <br /> 1 Advanced GeoEnvironmenta4Inc <br />