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C. Collection of soil vapor samples for chemical analysis, a <br /> soil vapor contaminant assessment ( SVCA ) see Appendix C. <br /> The results of chemical analysis to date are summarized in <br /> Tables 5-1 and 5-2 . The locations of soil borings, monitoring <br /> wells, and SVCA vapor points are illustrated in Figure 4-1 . <br /> 6 . Estimates of liquid quantity and composition leaked into the <br /> environment . <br /> To EA' s knowledge no record of release to the environment either <br /> qualitative or quagtitative is available. Based on analytical <br /> data and past site usage the contamination is most probably a <br /> fuel hydrocarbon, gasoline. <br /> 7 . Local topography, geology, nearby streams, depth to ground <br /> water. <br /> Local topography: As illustrated in Figure 2-1 the site is <br /> relatively flat with no apparent surface topography. <br /> Geology: As illustrated in the boring logs in Appendix B the <br /> site appears to be underlain by lean clay and silty clay with <br /> minor discontinuous silty sand and sand lenses from ground <br /> surface to an average depth of 18 feet. An apparently continuous <br /> ( at least within the limits of the 3 borings ) sandy strata <br /> underlies the clay from a depth of 18+ to 28+ feet . Apparently <br /> discontinuous lenses of finer grained silty clay are found within <br /> this sandy formation. Below 28+ feet a continuous lean clay <br /> formation underlies the site to a depth of at least 31 + feet <br /> ( the terminal depth of the borings ) . <br /> Nearby streams: The nearest streams are apparently the Calaveras <br /> and San Joaquin rivers which are approximately . 5 miles south and <br />