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1318es Environmental Management Inc U Haul#709 50 <br /> 002 70950-04 Groundwater Momtonng Report <br /> 0]/23/03 <br /> The water level measurements, sample name, time, and container type were recorded on sample data <br /> sheets included in Appendix A Groundwater sampling procedures are described in Appendix B <br /> Groundwater samples collected from the site were contained in appropriate sample bottles supplied by <br /> Del Mar Following collection, the groundwater samples were placed on ice and transported, under <br /> proper chain-of-custody protocol, to Del Mar for analysis <br /> 3 2 2 Groundwater Sample Analysis— September 2002 <br /> The groundwater samples collected in the September 2002 groundwater monitoring event were analyzed <br /> for total petroleum hydrocarbons as diesel (TPHd), and total petroleum hydrocarbons as gasoline <br /> (TPHg), using EPA Method 8015B The samples were also analyzed for benzene, toluene, ethylbenzene, <br /> and total xylenes (BTEX), methyl tert-butyl ether (MTBE), tert-butanol (TBA), di-isopropyl ether <br /> (DIPE), ethyl tert-butyl ether (ETRE), and tert-amyl methyl ether (TAME), according to EPA Method <br /> 1 8260B The SJCEHD requested that the groundwater samples collected from wells MW-213 and MW-2C <br /> also be analyzed for volatile organic compounds(VOC's)using EPA Method 8260B full list <br /> 3 3 GROUNDWATER ANALYTICAL RESULTS—SEPTEMBER 2002 <br />' Laboratory analytical results for the September 2002 groundwater sampling event, which included two <br /> sample groups ("B" and"C" casing samples), revealed substantial variation between the two groups A <br /> summary of the analytical results for the September 2002 sampling event is presented in Table 2 A <br /> copy of the corresponding laboratory analytical report and chain-of-custody documentation is provided <br /> in Appendix C <br />' Analytical results of groundwater samples collected from the well casings screened across the <br /> groundwater interface ("B" casings) revealed the highest concentrations of hydrocarbons in groundwater <br />' from wells MW-2B, MW-3B, and MW-4B The concentrations of hydrocarbons in groundwater from <br /> well MW-3B was greater than 100,000 micrograms per liter (ppb) TPHg and greater than 10,000 ppb <br />' benzene Benzene concentrations were below laboratory reporting limits in groundwater samples from <br /> monitor wells MW-8A and MW lOB Analytical results are summarized to Table 3 The approximate <br />' extent of hydrocarbon contamination in groundwater associated with "B" casing wells is shown in <br /> Figures 5 and 6 <br /> 1 <br /> • 8 <br /> 1 <br /> 1 <br />