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e BOARD OF TRUSTEES SAN JOIAQUIN LOCAL HEALTH DISTRICT SERVING James Culbertson, Pres. City of Lodi Patrlcla E. Vannuccl, Sec'y. � East Hazelton AYenUe, P. O. BOX 2009 San Joaquin County Anthonette Van Spronsen City of Escolon Earl Pimentel Stockton, California 95201 City of Manteca City of Ripon Fern Bugbee 209/466-6781 City of Stockton Daniel L. Flores John D. Mast, M.D. City of Tracy William J. Wade Jogl Khanna, M.D., M.P.H., District Health Officer San Joaquin County Mary Anna Love San Joaquin County March 25, 1986 `?'y" � ' ' State Department of Transportation P 0 Box 2048 Stockton, CA 95201 Atten : Preston Kelley District Director of Transportation RE: Underground Storage Tank removed from Southern Pacific Railroad Property located in crosstown freeway right of way between Lafayette and 'Washington Streets , Stockton, CA The following is a summary of the site evaluation status and remedial actions at the above noted site and a proposed agreement for future site management: On December 12, 1985, a 10,000 gal . underground storage tank was removed by 0.H. Materials (OHM) under permit and inspection of the San Joaquin Local Health District. The tank, which was actually a 35 ft. long by 7.5 ft. diameter railway tank car with a bottom valve, had a poorly identified past history but had contained diesel and possibly waste oil . Residual diesel in an oily matrix (250 gal . ) had been removed from the tank by OHM on December 9, 1985 (see analysis results on contents dated 12-10-85) . Soil samples were collected from the tank excavation by OHM personnel and analysis requested for benzene, toluene, xylene, total hydrocarbons by GCEID and PCB' s. Diesel odor and discoloration were noted in the soil beneath the tank but no visible holes were noted in the tank. Results of the analysis for total hydrocarbons were ND at 1.0 ppm and 260 ppm at the south end of the excavation and 2600 ppm in the north portion of the excavation (see laboratory ,results received December 31 , 1985). The State Department of Transporation (Cal-Trans) was given the option of excavating the contaminated soil (visible and odor) and resampling to verify adequate clean up (see inspection report of January 10, 1.986) . Approximately 35 cubic yards of soil were removed from the excavation by OHM on January 21, 1986, and two soil samples were collected from the bottom of the excavation. The odor of diesel was still present in the soil collected for sampling, however, the Cal -Trans representative elected to proceed with analysis because the soil removal equipment had been removed from the site.