Laserfiche WebLink
_ <br /> tzi <br /> Jul 28, 1988 AGS .lob No. 38012-2 <br /> A Y <br /> ' Former UNOCAL Service Station, Stockton, California <br /> A geologist from Applied Geosystems was present at the site on <br /> r� <br /> March 30, 1988, to collect eight soil samples from beneath the <br /> base of the tanks. The tanks were removed and soil was excavated <br /> from the tank cavity with an excavator. The removed tanks were <br /> hauled by Triangle, Inc. , to its facility in Sacramento. <br /> Six soil samples were collected from native and silty clay at <br /> approximately 16 feet below the ground surface in the gasoline <br /> storage tank cavity, or 2 feet below the bases of the former <br /> gasoline tanks. Samples were collected below each end of the <br /> , t tanks and below the former fill ports at the centers of the <br /> tank. Another sample was collected from approximately 8 feet <br /> below the ground surface, or 2 feet below the base of the former <br /> waste-oil tank. Obvious hydrocarbon odor, inferred to be <br /> gasoline, was present in three soil samples. Some evidence of <br /> soil contamination was noted in the native material below the <br /> tanks and in the walls of the excavation. Because subjective <br /> evidence of hydrocarbon contamination was detected bylaw the <br /> former gasoline storage tanks, additional soil was excavated to <br /> reduce the levels of remaining contaminants. The additional <br /> excavation was done at the request of UNOCAL and with the <br /> - _.- -- ---- approval--_o i._the--of --The--tan3�--cavi.t1�-dimens.ions_._were_ enlarged ------ - ------ <br /> "-% to approximately 25 by 35 feet, and a bench was cut into the <br /> - 3 <br /> ,4VP11e0F GevSystenls <br />