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3 <br /> iand sealed without headspace All of the samples were labeled and stored <br /> on ice foi ti anspoi t to Kiff Analytical, LLC of Davis, Califoinia (ELAP <br /> #2236) undet appiopiiate chain-of-custody documentation Well <br /> sampling field logs aie presented in Appendix A The site diinking water <br /> well was sampled through a sampling port and was putged pilot to <br /> sampling <br /> Well Sampling putge water was disposed of thiough the on-site activated <br /> cal bon ti eatment system <br /> 4 0 GROUNDWATER SAMPLE ANALYSIS <br /> The gtoundwatel samples were analyzed foi total petroleum <br /> hydrocarbons as diesel (TPH-D) b% EPA Method 351018015, and total <br /> petioleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethyl <br /> benzene and total xylenes (collectively known as BTEX), fuel oxygenates, <br /> lead scavengers, and 1,2-dichloropropane (1,2-DCP) by EPA Method 8260 <br /> The analytical results for this and pievious sampling periods are <br /> presented in Tables Two and Th i ee The cei tified analytical report a n d <br /> chain-of-custody documentation aie included as Appendix B <br /> • 5 0 CONCLUSIONS <br /> Free-floating hydrocarbons were present on the groundwater surface in <br /> monitor ing wells MW-5 MW-6, and piezometer P-4 Monitoring well <br /> MW-5 has historically contained free-product The remaining wells <br /> (MW-6 and P-4) have not contained fiee-pioduct in the past <br /> Isoconcentiation contour maps for TPH-G, benzene, and MTBE in the <br /> shallow water-bearing zone are pi esented as Figures S through 7, <br /> i e"pectively <br /> 1 ,2-dichloropropane was detected in groundwater samples collected from <br /> monitoirng wells MW-7, MW-8, M1N -9 MW-11 , MW-12, MW-17, MW- 18, <br /> and the on-site drinking water well All of these wells are screened i n <br /> deeper water bearing zones None of the 1,2-DCP concentrations <br /> exceeded the DHS MCL for drinking water No 1,2-dichloroethane ( 1 ,2- <br /> DCA) was detected in any of the site monitoring wells this quarter <br /> The benzene concentiation detected in groundwater samples collected <br /> from monitoring well MW-13 exceeded the California Department of <br /> • Health Services (DHS) maximum contaminant level (MCL) for drinking <br /> water The MTBE concentrations detected in groundwater samples <br /> Frank's One Stop Quarterly Report — June 2001 Sampling <br /> -3- <br />