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r <br /> bailers into 40-m1 volatile organic analysis (VOA) vials, preserved with <br /> hydrochloric acid and sealed without headspace All of the samples were <br /> labeled and stored on ice for transport to Kiff Analytical, LLC of Davis, <br /> California (ELAP #2236) under appropriate chain-of-custody <br /> documentation Well sampling field logs are presented in Appendix A <br /> Well sampling purge water was stored in 55-gallon steel drums, labeled <br /> and left on-site for temporary storage until proper off-site disposal can be <br /> arranged <br /> 4 . 0 GROUNDWATER SAMPLE ANALYSIS <br /> The groundwater samples were analyzed for total petroleum hydrocarbons <br /> as gasoline (TPH-G), benzene, toluene, ethylbenzene, and total xylenes <br /> (collectively known as BTEX), and methyl-t-butyl-ether (MTBE) by EPA <br /> Method 8015M/8020 and total petroleum hydrocarbons as diesel (TPH-D) <br /> by EPA Method 3510/8015 The analytical results for this and previous <br /> sampling periods are presented in Tables Two and Three The certified <br /> analytical report and chain-of-custody documentation are included as <br /> Appendix B <br /> • 5.0 CONCLUSIONS <br /> Isoconcentration contour maps for TPH-G, benzene, and MTBE in t h e <br /> shallow water-bearing zone are presented as Figures 5 through 7, <br /> respectively <br /> The BTEX, TPH-G, and/or MTBE concentrations have increased in the <br /> groundwater samples collected from monitoring wells MW-5, MW-6, <br /> MW-13, MW-19, and MW-20 since the previous quarter However, with <br /> the exception of MW-19, all of the results are relatively similar to results <br /> six months ago The hydrocarbon concentrations in groundwater samples <br /> collected from monitoring well MW-19 had a significant increase this <br /> quarter The TPH-D concentrations also increased in the groundwater <br /> samples collected from monitoring wells MW-9 and MW-10 <br /> Benzene and MTBE concentrations in monitoring wells MW-13 and MW-19 <br /> exceeded the California Department of Health Services (DHS) maximum <br /> contaminant level (MCL) The toluene concentration in monitoring well <br /> MW-5 exceeded the DHS MCL for drinking water The ethyl benzene a n d <br /> total xylene concentrations in monitoring wells MW-5 and MW-6 exceeded <br /> • DHS MCLS for drinking water <br /> Frank's One Stop Quarterly Report — June 2002 Sampling <br /> -3- <br />