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Report:Groundwater-quality Monitoring—July 27,2004:7500 West Eleventh Street,Tracy,CA. Page 7 As shown on Figure 2, underground fuel tanks were formerly located on the property at { 24195 Chrisman Road, which adjoins the 7500 West Eleventh Street site to the south. They had contained diesel and were removed in December 1998. Although no additional investigation of the 24195 Chrisman Road site has been performed, SJC believes that � 1 because samples recovered from the bottom of the tank pit at the time of removal contained only low concentrations of diesel (Dietz Irrigation 1999b), it is likely that any contribution made by diesel migrating from the 24195 Chrisman Road site to the subject property would have had little, if any, deleterious effect on the environmental condition of the subsurface beneath the subject property. 1.5.3 Dispersed Shallow Areas of Subsurface Finally, there are dispersed, low concentrations of a variety of hydrocarbons affecting wide areas of shallow soil beneath the 7500 West Eleventh Street property and nearby land. Their presence can be attributed in some instances, hydrocarbons that have a i vegetative source rather than being related to releases of fuels, while in others, they can be attributed to minor leaks and spills from vehicles using unpaved areas of the former service station and being parked on the shoulders of the streets over past decades. Evidence has also been found that fill used to bring West Eleventh Street, Chrisman Road -_i and some of the adjoining sites to their present grade included some debris from bituminous macadam paving (The San Joaquin Company 2002c). To provide for clarity of the presentation of the primary and secondary plumes of affected groundwater emanating from the 7500 West Eleventh Street site, these dispersed areas of affected soil, which are of less than minor significance,have been omitted from Figures 3 through 9. I I I' I - sic