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TRACY SERVICE CENTER -2- 15 June 1987 <br /> 5. Sample analyses can be reduced to the indicator parameters BTX and total fuel <br /> hydrocarbons in soils (EPA Methods 8020 and 8015 modified) , and volatile <br /> aromatic and chlorinated hydrocarbons in water (EPA Methods 601 and 602) . <br /> Selected samples should be analyzed for the entire suite proposed for con- <br /> firmation of all constituents. <br /> 6. Analysis by EPA Method 7421 will detect total lead, not organo-lead. Method- <br /> ology, which has not been formally adopted, for analysis of organic lead is <br /> available from the Department of Health Services ' Hazardous Materials <br /> Laboratory in Berkeley. Alternately, total lead analyses can be performed and <br /> compared to background levels to determine if a potential organo-lead problem <br /> exists. <br /> 7. Continuous coring is superior to 18" split spoon samples at five foot inter- <br /> vals for both logging and sampling purposes. Although split spoon samples are <br /> acceptable, given the alluvial soils on-site and the dual purpose of the <br /> borings, I strongly recommend continuous cores be utilized. <br /> GAR:gs <br />