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• using dedicated bailers The aioundwatei samples were decanted ftotn the <br /> bailers into 40-m1 volatile of ganic analysis (VOA) vials, preset ved with <br /> hydrochloric acid and sealed without headspace All of the samples wet e <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 /> The site drinking water well was sampled through a sampling port a n d <br /> was pui ged prior to sampling <br /> Well sampling purge water was disposed of through the on-site activated <br /> carbon treatment system <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-but} 1-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 /> Fiee-floating hydrocarbons were not present on the groundwater surface <br /> in monitoring wells MW-5, MW-6, and piezometer P-4 this quarter <br /> Isoconcentration contour maps for TPH-G, benzene, and MTBE in the <br /> shallow water-bearing zone are presented as Figures 5 through 7, <br /> respectively <br /> The benzene concentration detected in groundwatei samples collected <br /> frons ii-ionitoting well MW-5 exceeded the Caltfoinia Department of Health <br /> Services (DHS) maximum contaminant level (MCL) for drinking water The <br /> total xylene concentration in the groundwater sample collected from <br /> monitoring well MW-6 exceeded the DHS MCL for drinking water The <br /> MTBE concentrations detected in groundwater samples collected fi om <br /> monitoring wells MW-13 and MW-19 also exceeded the DHS MCL for <br /> drinking water <br /> Frank's One Stop Quarterly Report — February 2002 Sampling <br /> -3- <br />