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24 March 2014 <br /> AGE Project No. 14-3034 <br /> Page 2 of 3 <br /> Once exposed, each tank was inspected to insure that residual fuel was not present. <br /> Prior to removal of the USTs, the tanks were triple rinsed by American Valley Waste Oil <br /> and L&B Environmental, using a pressure washer and alconox solution. Approximately <br /> 650 gallons of rinseate were extracted from the tanks with a vacuum truck and <br /> transported under manifest to DK-Dixon in Dixon, CA (State Manifest Document No. <br /> CAD983602251) by American Valley Waste Oil. Of Delhi, California (Attachment A). <br /> Dry ice was then applied to each UST. The lower explosive limit (LEL) and free oxygen <br /> was simultaneously measured to evaluate the risk of fire prior to UST handling and <br /> removal. The two tanks and associated piping were removed, transported and properly <br /> disposed of by Central Valley Demolition Company and Rake's Trucking of Modesto, <br /> California. The tank disposal receipt and Tank Closure Form are included in Attachment <br /> B. <br /> Soil removed from the piping excavation was placed on and covered with visqueen <br /> plastic and stockpiled on-site for future disposal. <br /> 2.1. SOIL SAMPLING <br /> On 11 March 2014, at the direction of an EHD representative, staff from AGE collected <br /> soil samples from the excavated stockpiles. On 12 March 2013, following the removal of <br /> backfilled UST soil, soil samples of native soil (silty clay) were collected at depth of 14.5 <br /> to 15 feet bsg. Soil samples were collected from the east, the center of tank and the <br /> west ends of the tank north tank (39-0181803) and south tank (39-0181804) (Figure 1). <br /> For soil samples collected from the excavation, the excavators bucket was used extract <br /> samples at depths of approximately 15 feet bsg. Once the bucket was at the surface <br /> staff from AGE collected samples from the bucket using a slide hammer and a two by <br /> six-inch steel sleeve; the slide hammer was also used to collect samples from the <br /> stockpiles. <br /> Upon collection, the end of each sample was covered with teflon tape and capped. <br /> Samples were then labeled with the sample location, date and time and were placed on <br /> ice until they were analyzed at CalTech Environmental Laboratory for the following <br /> constituents: <br /> Total petroleum hydrocarbons as gasoline (TPH-g) by EPA method 8260B. <br /> Benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA method 8260B. <br /> Advanced GeoEnvironmental,Inc. <br />