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Discussion an C. Inter retation of Results i In order : to provide. .graphic presentation of the results, Table 1 have been mapped and contoured to i ! individual data sets in Ta i Dashed contours are used where s f produce. Figures 2 through 5. { patterns are extrapolated into areas of less complete Qata, or as 4 i auxiliary contours 1 t a . A relatively high -Total Volatiles. level was observed southeast ^! concentrations of the pump islands (Station 14) , with more moderate e :tY 'boundary (Stations 6 and 7) . } extending along the eastern proP Concentrations decline rapid, to the east and west frothe "high" y m at Station 14, `indicating limited migration in those directions. i t of the occurrence is not evident from this The full eastern exten tiLow levels of Total Volatiles were detected throughout k survey. . r much of the remaining eastern portion of the site and at Station 23, between the pump is and the car wash. the MTBE/pentane occurrence Although less spatially extensive, Li_ ore 3) -was similar to .the Tota]. Volatiles feature. However, (F19 . the isolated anomaly .at Station 23 was not evident. Like the . • et:h lbenzene, + previously mentioned analytes,. benzene (Figure 4) , Y lenes were .highest at Station 14 with lower levels �_. and the xy- extending northward to the entrance driveway and landscape bed i luene level (St-.,--tions 6 and. 7) along Pershing Avenue. The to i- (Figure 5) was also highest southeast of the .pump islands, Low : r extend tank area, and along the eastern side concentrations . into of the property to ti_e northeast corner. -z The chromatogram signature of Sample 14 (southeast of the pump ., was typical of "fresh" island, where Total Volatiles were highest) yP 7 i