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U-Haul#704-50 Stockton,California SO;7'd Environmental Technology, Inc ' Groundwater samples collected during the September 1997 monitoring event were submitted in good condition, with appropriate chain-of-custody documentation, to Columbia Analytical (Colton, CA) for analysis Each of the samples were analyzed for the following constituents, • Total petroleum hydrocarbons as gasoline (TPH-g), by the DHS-TPH method (modified ' EPA method 8015), • Benzene, toluene, ethylbenzene, and xylenes (BTEX) by modified EPA method 8020, and ' • Volatile organic compounds by modified EPA method 8260, including the oxygenated compounds specified in the memo dated September 25, 1997 by San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) ' The groundwater sample analytical results revealed detectable TPH-g and/or BTEX concentrations in samples from all of the wells except MW-8, with the greatest concentrations reported in the sample from MW-4 In general, the data indicate a marginal decrease in contaminant concentrations for well MW-2 samples and a slight increase in contaminant concentrations for wells MW-3, MW-4, and MW-6 samples in comparison with the September 1996 analytical results ' The accumulated laboratory results are summarized in Table 2 and the current analytical results are presented in Figure 3, along with a groundwater benzene isoconcentration contour map None of the groundwater samples revealed detectable concentrations of the oxygenated compounds listed in the PHS/EHD memo by EPA method 8260, although relatively minor concentrations of several halogenated volatile organics were detected A summary of the EPA 8260 analytical results is presented in Table 3 A copy of the laboratory report and chain-of-custody documentation are attached SOTA is currently in the process of preparing a Remedial Action Plan (RAP) to mitigate residual gasoline contamination in soil and groundwater at the site under contract with UHI We estimate that the RAP will be completed within 30 days, and a copy submitted to PHS/EHD for review and comment prior to implementation ' If you have any questions or comments regarding this case, please contact our office at your earliest convenience We appreciate your cooperation in this matter ' Sincerely, SOTA Environmental Technology, Inc. Dakshana Murthy, Ph D , P E •� ' Project Manager cc Reid Reiner9�aF ONA0t.1V�4��. U-Haul International,Inc 2721 N Central Avenue Phoenix, AZ 85004 2