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Aeration Pian <br /> 500 Galion Gasoline UST <br /> Former Lockeford Winery <br /> Lockeford, California <br /> 1.0 Background <br /> On August ?4, 1999 a 500 gallon underground storage tank was removed and <br /> transported off-site for disposal. The UST was a single wall steel tank and <br /> formerly contained gasoline. The UST was last used in the late 1980's. After <br /> removal, a backhoe was used to collect a soil sample at a depth of two feet <br /> below the invert of the. UST (approximately 8 feet-below ground surface). A four- <br /> in-one-composite <br /> our-in-one-composite sample was also collected from the soil stockpile. The sample <br /> taken, from below the UST contained 690 ppm TPH gasoline. Please see i <br /> Sample Result Summary. <br /> i <br /> i <br /> The planned future activities at the site include over-excavation of the UST 3 <br /> excavation torem ve any remaining contaminated soil from the excavation. 1 <br /> The � <br /> t <br /> excavated soil will be placed in.a temporary soil stockpile.ile. <br /> t <br /> 2.0 Aeration Pad % f <br /> The proposed aeration pad will be the existing concrete slab located adjacent to <br /> the north side of the UST excavation. The slab is of sufficient size to <br /> I <br /> accommodate the contaminated soil from the UST excavation. Prior to <br /> placement of soil on the slab, any debris will be removed from the slab and the <br /> concrete will be swept clean. <br /> The soil will then be removed from the soil stockpile and spread out on the <br /> concrete slab. The soil will be-placed at a maximum depth.of one (1) foot. <br /> 1 of 2 <br />