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Chevron/'South El Dorado E: 4 <br /> September 1990 <br /> In June 1983 , four underground fuel storage tanks were <br /> replaced with fiberglass fuel tanks, which were later removed on <br /> September 1 and 2, 1987 . <br /> PREVIOUS', WORK <br /> Since September 1989, four phases of work have been <br /> i� <br /> performed at the site. These phases include underground tank <br /> removal,:Isoil excavation, soil aeration, excavation backfilling <br /> and monitoring °well installation. The results of this work are <br /> presente'd in Groundwater Technology' s "Soil Excavation and well- <br /> Installation Report" dated August 1990. <br /> Underground Tank Removal. At the time of the final <br /> 'i, <br /> underground storage tank removal in September 1989 , twelve soil <br /> samples were collected from the tank-pit excavations and from the <br /> �ii <br /> soil adjacent to the three pump islands. Laboratory results from <br /> these soil samples indicated that the soil beneath the under- <br /> ground tanks was impacted by gasoline hydrocarbons. <br /> Soil Excavation_ In January and February, 1990, <br /> approximately 500-cubic yards of -additional soil was excavated <br /> from the'i!:tvicinity of the former underground tanks. Due to the <br /> limited capability of the excavation equipment, the excavation <br /> was halted at approximately 20-feet below grade. Laboratory <br /> analyses .-of soil samples collected for the presence of Total <br /> q� <br /> Petroleum Hydrocarbons (TPH) -as-gasoline indicated a maximum <br /> concentration of 3 , 400 .parts per million (ppm) at the base of <br /> i� k <br /> the excavation. <br /> __._ GROUNDWATER <br /> INC. <br /> TECHNOLOGI`. <br />