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HUNICI--IEINII <br /> Mr. Bill Vizza <br /> 30 November 1993 <br /> Page 6 <br /> slight in magnitude and are likely due to outside influences, such as local groundwater <br /> pumping and irrigation activities. Calculated groundwater flow directions and flow <br /> gradients are illustrated in Figure 1. <br /> Results of Laboratory Anal ses <br /> Soil Analyses <br /> Each groundwater sample submitted was analyzed for total petroleum hydrocarbons as <br /> diesel (TPH-D) using EPA Method 8015 modified and benzene, toluene, ethylbenzene and <br /> total xylenes (BTEX) using EPA Method 602 <br /> Laboratory analyses of soil samples are summarized in Table 2 and indicate that petroleum <br /> hydrocarbons and benzene, toluene, ethylbenzene and total xylenes were not detected at <br /> concentrations greater than their method detection limits in the soil samples collected <br /> from MW-1, MW-2 and MW-3. <br /> Groundwater Analyses <br /> . Each groundwater sample was submitted for analysis of total petroleum hydrocarbons as <br /> diesel using EPA Method 8015 modified and benzene, toluene, ethylbenzene and total <br /> xylenes using EPA Method 8020. <br /> Laboratory analyses of groundwater samples are summarized in Table 3 and indicate that <br /> petroleum hydrocarbons and benzene, toluene, ethylbenzene and total xylenes were not <br /> detected at concentrations greater than their method detection limits in the soil samples <br /> collected from MW-1, MW-2 and MW-3. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Total petroleum hydrocarbons as diesel, benzene, toluene, ethylbenzene, and total xylenes <br /> were not detected at concentrations greater than their method detection limits in either <br /> soil samples collected immediately above the groundwater surface or groundwater samples <br /> collected at locations upgrad►ent and downgradient of the former underground tank <br /> location. These results support City of Tracy records indicating that UST system piping <br /> leakage discovered as a result of a failed UST integrity test was confined to a vent pipe <br /> connection which was above the normal UST product level. <br /> City of Tracy records indicate that soil impacted by leakage of approximately 0 2 gallons <br /> of diesel product during the UST integrity testing was excavated and properly treated. <br /> • Following soil excavation activities, it is reported that water was noted to accumulate <br /> within the excavated area. As sample of water within the excavation is reported to have <br />