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, GTATE O:,CAUFORNIA AWL GEORGE DEUKMEJIAN,Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— i„W E CENTRAL VALLEY REGION 3443 ROUTIER ROAD L �./, -�o SACRAMENTO,CA 95827-3098 v ENVIROMENTAL HEALTH FERMIT/SERVICES 17 March 1988 Mr. Alexander Krygsman, Port Director Port of Stockton P.O. Box 2089 Stockton, CA 95201 OCCURRENCE OF GASOLINE ON GROUND WATER, PORT OF STOCKTON, SAN JOAQUIN COUNTY The recent discovery of up to three feet of gasoline on shallow ground water in the Southern Pacific Pipeline (SPPL) right-of- way, the Time Oil terminal, and adjacent to two sides of the Tesoro Petroleum terminal has resulted in substantial efforts by these three parties to locate the source, and assess the extent of petroleum product in the subsurface. Despite the efforts to date, the source of the petroleum product has not been located, although at least 7,000 gallons of product have been removed from the shallow ground water. The impact of this release on ground water must now be fully defined. As we discussed in our 8 March 1988 meeting, the Regional Board requests SPPL, Time Oil Company, Tesoro Petroleum Corporation, and the Port of Stockton jointly investigate the impacts of this uncontrolled release of petroleum product on water quality. This should result in the submission of one comprehensive Technical Report to the Board. The primary goal of this investigation is to determine the extent of soil and ground water contamination resulting from this incident, and to identify the source of petroleum product. We also request that product removal continue - after definition of the extent of free product has been completed. Time Oil, SPPL, and Tesoro Petroleum are leasing property from the Port of Stockton. Therefore, the Port of Stockton and the three tenants listed above, are required to submit a Technical Report, pursuant to Section 13267 of the California Water Code, which includes the following: I. Site assessment including documentation of investigation to date, and compilation of existing information. A. Document leak testing which has been performed on pipelines and tanks. 1. Describe testing methods used. 2. Quantify the sensitivity of these methods. (How large a leak can occur without being detected?)