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LEVINE•FRICKE peak retention times. Estimated Relative Acre of the Samples. The high concentrations of organic lead in the hydrocarbon samples indicates that the samples have not been weathered and ' are relatively fresh and are probably less than a few months old (personal communication, Andrew Friedman, FFB) . Weathering of the gasoline would have resulted in a significant decrease in the ' organic lead concentrations. Aging (weathering) of gasoline also results in the loss of its volatile components as well as polymerization and subsequent hydroxylation of the heavier end. Analysis of aged gasoline samples by GC results in lower peak areas for the front ends of the chromatogram and a continuous increasing drift in the base- line of the back end of the chromatogram due to the formation of weak dimerized derivatives such as fatty acids. However, none of these phenomena were observed in the samples analyzed for this investigation. The high relative concentrations of volatile con- stituents in the hydrocarbon samples indicates that the hydrocar- bons are very fresh, probably on the order of less than a few months (personal communication, Jerry Martin, CESC) . ' However, the rate at which gasoline and other fuels age will vary with soil depth, mineral composition (catalytic activity) , tem- perature, biodegradation, and exposure to atmospheric conditions. These factors make an exact aging of the gasoline impossible and result in the more qualitative aging assessment. PRODUCT MOVEMENT ' SPPL transports regular leaded gasoline, diesel fuel, JP-4, and a variety of unleaded gasolines through its pipelines. Recent product movement records for the three pipelines investigated, ' Time Oil pipeline (LS-44) , Mobil and Shell pipeline (LS-45) , and the main pipeline from the Concord terminal (LS-62) , were evalu- ated to assess the relative percentages of various fuels carried through each pipeline. These results are presented in Table 3 . The Table 3 data suggest that product recently originating from a leak from any of the three pipelines would be predominantly unleaded gasoline. Unleaded gasoline comprised between 46 and 65% of fuel shipments through the pipelines over the week prior to shutdown of the pipelines and 42 to 63% over the previous ' 3-1/2 weeks prior to shutdown of the pipelines. Fuel character- ization and organic lead analyses indicate that the fuel at each of the three locations was 90 to 95% leaded gasoline with only 5 to 10% diesel.