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b) The elevated concentrations of oil and grease are due to leakage of the residual oil into the soil during pipeline removal. It is quite possible that a small amount of oil still remained in the pipe and spilled out when the pipe was removed post 1940. c) The elevated concentrations of oil and grease are due to the tar-like wrapping used to cover the pipe. It is possible that long term irrigation and rain waters coming in contact with the tar wrap remaining in the ground leached hydrocarbons into the immediate soil surrounding the former pipeline. The afore-mentioned scenarios are merely speculations made by ASE and cannot be viewed as fact. ASE recommends the following: I ) Send the most contaminated sample (Pipe Location E) to Friedman and Bruya, Inc. (F&B), a laboratory specializing in petroleum hydrocarbon fingerprinting. F&B may be able to determine if the contamination is a result of the bunker "c" and/or crude oil or from the tar-like wrap used to coat the pipe. 2) Notify the local regulatory agency with a copy of this report. Request that a recommendation yfor further action, if any, be made by the agency. The local agency contact is: San Joaquin County Environmental Health Services P.O. Box 2009 Stockton, CA 95201 (209) 468-3441. 11.0 REPORT LIMITATIONS The results of this investigation represent conditions at the time and specific A location at which soil samples were collected, and for the specific parameters analyzed by the laboratory. It does not fully characterize the site for contamination resulting from unknown sources, or for parameters not analyzed for by the laboratory. All of the laboratory work cited in this report was prepared under the direction of independent CSDHS certified laboratory. The j independent laboratory is solely responsible for the contents and conclusions of the chemical analysis data. J Schulte and Chrisman Road, Tracy CA - May 1995 (ASE #2857)