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' 0 0 FARR, FRIEDMAN & BRUYA, INC. ' ENVIRONMENTAL CHEMISTS James K.Farr,Ph.D. 3008 B- 16th West Andrew John Friedman Seattle,WA 98119 ' James E.Bruya,Ph.D. (206)285-8282 April 9, 1988 ' Fred Proby, Project Leader Time Oil Company ' 2737 West Commodore Way Seattle, WA 98199 Dear Mr. Proby: ' Enclosed are the results of the analyses of samples submitted on March 29, 1988 from your Stockton Terminal Project. I have concluded that the sample submitted for analysis is a leaded gasoline, that it most probably came from a single spill, and that it is also not more than about a year old. In addition ' to analyzing the three selected samples for organic lead content, we examined each of the samples for individual hydrocarbon ratios to determine if there was any indication of unmixed, separate ' products being present in the soil . A careful examination of some characteristic compounds has led me to the conclusion that the material submitted is either the result of a single spill, or has been mixed to the point that it is no longer distinguishable ' as separate gasolines . I am including the chromatograms that have led me to this ' conclusion, along with several other chromatograms of other gasolines, to show the degree of uniqueness that this material displays. It does not show any gradations of mixing that one ' would expect if several spills were continuously mixing in the soil . There appears to have been very little weathering of the gasoline ' found floating on the surface of the water. Extensive weathering would be expected if the gasoline and water had been in contact for an extended period of time. Also, the organic lead content t is at or below 0. 1 g/gallon, a standard introduced approximately a year ago and is down from previous levels of around 1 g/gallon. This level of organic lead is considerably above the 0 . 05 ' g/gallon limit set for unleaded gasoline products. It is possible that an older leaded gasoline would lose its organic lead content and appear to be a newer product, based solely on the lead content. However, this seems unlikely to be the case, ' since the gasoline shows very little weathering by gas chromatography. Also, the samples showing the highest degrees of weathering (loss of API gravity and lighter components) would be ' expected to show the lowest lead content which was not the case. These test results suggest that the lead content in the product has, in fact, changed very little. 1 t