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Report,, Groundwater-quality Monitoring—July 30,2003: 7500 West Eleventh Street, Tracy, CA. Page 5 <br /> � I <br /> because samples recovered from the bottom of the tank pit at the time of removal <br /> contained only low concentrations of diesel (Dietz Irrigation 1999b), it is likely that any <br /> contribution made by diesel migrating from the 24195 Chrisman Road site to the subject <br /> property would have had little, if any, deleterious affect on the environmental condition <br /> of the subsurface beneath the subject property. <br /> Finally, there are dispersed, low concentrations of a variety of hydrocarbons affecting <br /> wide areas of shallow soil beneath the 7500 West Eleventh Street property and nearby <br /> land. The presence of these hydrocarbons can be attributed to minor leaks and spills from <br /> vehicles using unpaved areas of the former service station and being parked on the <br /> shoulders of the streets over past decades. Evidence has also been found that fill used to <br /> bring West Eleventh Street, Chrisman Road and some of the adjoining sites to their <br /> present grade included some debris from bituminous macadam paving (The San Joaquin <br /> Company 2002c). To provide for clarity of the presentation of the primary and secondary <br /> plumes of affected groundwater emanating from the 7500 West Eleventh Street site, these <br /> dispersed areas of affected soil, which are of less than minor significance, have been <br /> omitted from Figure 2. <br /> a <br /> 4 <br /> h <br /> r <br /> i <br /> sic <br />