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2.0 TECHNICAL DISCUSSION <br /> o General Description <br /> The mailing address for Del Monte plant No. 33 is 2716 E. Miner Ave. <br /> in Stockton, CA. Exceltech removed three (3), 10,000 gallon fuel <br /> gasoline tanks at the Del Monte Stockton storage area located at the <br /> carrier of Myrtle St. and Filbert St. The tanks previously supplied <br /> products to a gasoline station which was latter purchased by Del <br /> Monte and subsequently taken out of service. The tanks were buried <br /> beneath a 40'X35' concrete pad positioned immediately adjacent to the <br /> service station building. <br /> After exposing the top surfaces of the tanks, Exceltech discovered <br /> that all three tanks were filled with water, necessitating its removal <br /> prior to excavating the tanks. Analysis of the water in the tanks <br /> revealed that the hydrocarbon levels were relatively low (less than 10 <br /> mg/kg) and lead was riot detected. Based on these results, the City of <br /> Stockton, Municipei Utilities Department permitted Del Monte to <br /> k dispose of the liquids in the City sanitary sewer. <br /> Once the tanks were removed, the soil beneath the tanks was found <br /> to be contaminated with gasoline. Exceitech proceeded to aerate the <br /> soil by rnechanically turning the soil until the relatively volatile <br /> constituents Had vaporized yielding material that could be directly <br /> backfilled into the excavation. <br /> Finally, after compaction, the excavated area was resurfaced with <br /> an asphalt cover. <br /> o Subsurface Inspection and Soil Analysis <br /> Although an obvious source for fuel leakage (i.e. pipe breaks or tank <br /> holes) n,as not present, gasoline contamination of the soil below th& <br /> tanks was imrnediately evident from a strong vapor smell present <br /> when the tanks were remove Subsequent laboratory analysis,, <br /> confirmed that soil Contarnination ,vas particularily high beneath thile <br /> northern tank identified as Tank .'4 (see Trace Analysis Laboratory <br /> results dated 10/26/65). Fortunately, the contamination appeared to <br /> be limited to a depth of approximately seven (7) feet as summarized <br /> beIo <br /> Page- 3 OCT +. a <br /> 6N\%IRomiENTAL HEALT <br /> PERMITJS6RVICF0 <br />