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' LEVINE•FRICKE ' To verify the Levine•Fricke conclusions, SP-2, SP-3 and SP-4 ' samples as well as fuel standards were sent to FFB for indepen- dent chemical analysis and interpretation. The chromatograms of the SP-2 , SP-3 and SP-4 samples as well as those of standard reg- ular gasoline, unleaded gasoline, JP74 fuel and diesel were ana- lyzed and evaluated by FFB. Specific analysis of the front ends of the chromatograms were conducted by FFB. Based on computer- ized chromatogram matches between the samples and the fuel stan- dards, FFB concluded that the samples contain about 90 to 95% gasoline and trace levels of heavier material such as #2 Fuel oil (diesel) . No JP-4 was reported to be present in the samples. ' FFB also found organic lead in the hydrocarbon samples at concen- trations of 16 to 19 ppm. These concentrations indicate that the gasoline is a regular leaded product since the maximum con- centration of organic lead in unleaded gasoline is around 6 ppm and the maximum concentrations of organic lead in leaded gaso- lines is between 22 and 25 ppm. Initial organic lead analyses ' performed by CAL suggested that the organic lead content of the fuel samples indicated an unleaded product. However, after care- ful scrutiny of the CAL analytical procedures, these data did not pass the Levine•Fricke quality assurance/quality control evalua- tion and are not presented in this report. Hydrocarbon samples were also retrieved from an excavated ditch ' along LS-44 immediately northwest of the Tesoro garage (Figure 1) . Preliminary analytical results in early March indicated that the product from this ditch was diesel fuel. However, recent ' sampling of the hydrocarbons by SPPL and detailed analysis by FFB reveals that the product is a heavily weathered gasoline with a small amount (less than 10%) of heavier product resembling diesel fuel. These results indicate that the hydrocarbons in the ditch, ' although more weathered, are similar in type to the product found in SP-2, SP-3 and SP-4 . The FFB report is included in Appendix A. ' Fuel Fingerprint Characterization Detailed evaluation of the chromatogram characteristics was con- ducted by Levine•Fricke by comparing the chromatograms of the samples to the fuel standards (Table 2) . The ratios of the rela- tive peak areas of two adjacent constituents were computed for ' fuel standards JP-4, Gasoline A, and Gasoline B and the three fuel hydrocarbon samples (SP-2, SP-3 and SP-4) . The chromato- grams were prepared by CESC. The ratios indicate the relative ' concentration of various constituents in both the fuel standards and the subsurface samples. Comparison of the ratios indicates that the subsurface samples are predominantly gasoline similar to Gasoline B and that the samples do not contain JP-4 . These results support the conclusions based on the evaluation of the ' -5-