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Discussion and Interpretation_oi Results <br /> In order to provide graphic presentation of the results, <br /> individual data sets in Table 1 have been mapped and contoured to <br /> ' traduce Figures 2 through 5. Dashed contours are used where <br /> patterns are extrapolated into areas of less complete data, or as <br /> auxiliary contours. <br /> t A relatively high Total Volatiles level was observed southeast <br /> of the pump islands (Station 14) , with more moderate concentrations <br /> extending along the eastern property boundary (Stations 6 and 7) . <br /> :. Concentrations decline rapidly,to the east and west from the "high" <br /> at Station 14, indicating limited migration in. those. directions. <br /> The full eastern extent of the occurrence is not, evident,from this ;? <br /> e survey. Low levels of Total Volatiles were detected throughout <br /> 1 much of the remaining eastern portion of the site and at Station <br /> 23, between the pump islands and the car wash. <br /> f " Although less spatially extensive, the MTBE/pentane occurrence <br /> (Figure 3) was similar to the Total Volatiles feature. However, <br /> h„ the isolated anomaly at ctatior. 23 was not evident. Like the <br /> .� previously mentioned analytes,. benzene (Figure 4) , ethylbenzene, <br /> and the xylenes were highest at Station 14, with lower levels <br /> d. <br /> extending northward to the entrance driveway and landscape bed <br /> (Stations 6 and 7) along Pershing. Avenue. The toluene level <br /> (Figure 5) was also highest southeast of the pump islands. Low <br /> concentrations extend into tank area, and ' +long the eastern side <br /> of the property to the. northeast corner. <br /> The chromatogram-signature-of-Sam p 1_e__14 (southeast-of-the-pump—- - - <br /> :slanJ, where Tote; Volatiles were highest) was typical of ."fresh" <br /> a 7 <br /> r <br /> i <br /> r <br />