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2.0 TECH.HICAL DISCUSSION? <br /> o SeneP$1 Description <br /> The mailing address for Del Monte plant Pdo. 33 is 2716 E. Miner Ave. <br /> in Stockton, CA. Exceltech removed three (3), 10,000 gallon fuel <br /> gasoline tanks at the Ciel Moate Stockton storage area located at the <br /> corner of Myrtle St. and Filbert St. The tanks previously supplied <br /> products to a gasoline station which N•vas latter purchased by Del <br /> Monte and subsequently taken out of service. The tanks were buried <br /> beneath a 40'X%35' concrete pad positioned irnrnediately 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 /> rng/kg) and lead was not detected. Based on these results, the City of 'I <br /> Stock ori , Municipal Utilities Department permitted Del Monte to�N� <br /> dispose of the liquids in the City sanitary se,ner. 1 <br /> Once the tanks ih••ere removed, the soil beneath the tanks was found w <br /> 1 to be contaminated with gasoline. Exceltech proceeded to aerate the � <br /> :oil by mechanically turning the soil until the relatively volatile <br /> constituents had 'vaporized yielding material that could be directly / <br /> backfilled into the excavation. 1 <br /> Finally, after compaction, the excavated area was resurfaced with <br /> an asphalt cover. <br /> I <br /> o Subsurface Inspection and Soil Analysis <br /> Although an obvious source for fuel leakage (i.e. pipe breaks or tank <br /> holes) vas not present, gasoline contamination of the soil below they <br /> tarda ;vas immediately evident from a strong vapor smell present <br /> vihen the tanks were rernovel Subsequent laboratory analysis; <br /> confirmed that soil contamination was particularity high beneath the <br /> northern tank identified as Tank 7u (see Trace Analysis Laboratory <br /> results dated 10/28/05). Fortunately, the contamination appeared to <br /> be. lirnii_ed to a depth of approximately seven (7) feet as Summarized <br /> Pare_ 3 <br /> .r' <br /> v r <br />