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Underground Storage Tank Systoemoval and Assessment is Sears Unit#0555, Tracy, California 2.0 SITE DESCRIPTION 2.1 Physical Description ' At the time of field activities,the Sears Orchard Supply Hardware operated a warehouse at 2650 North MacArthur Drive in Tracy, California(Figure 1). MACTEC was contracted to oversee the removal of ' active 750-gallon UST located at the north side of the Orchard Supply facility. A facility map including the UST location is provided in Figure 2. Reportedly installed in the 1980's,the UST was used to store waste oil generated at the facility and was ' accessed by a remote fill port located within the warehouse building. Specifications for the removed UST are as follows. ' . Capacity: 750 gallons . Dimensions: 4-foot diameter by 8-foot length . Protection: Fiberglass ' . Orientation: North to south . Depth: Bottom of the UST approximately 9 feet below the ground surface (bgs) ' A steel waste oil distribution line existed between the UST and a pump inside the warehouse where the waste oil was generated,and a vent line led from the UST to the warehouse building. At the time of the ' UST removal,the pump was operational but not in use. The UST location and orientation is included in Figure 3. ' 2.2 Local Hydrogeologic and Subsurface Conditions ' An examination of soils removed during the excavation of the UST indicated the native lithology consisted predominantly of dry to moist, soft, dark grayish brown lean clay and dry,loose,dark brown ' clayey gravel with sand. The fill surrounding the UST was mainly dry,loose,dark brown clayey gravel with sand. Groundwater was not encountered during excavation of the UST. The site, situated ' approximately 30 feet above mean sea level,has a local geology characterized by flood basin deposits. 1 2 MACTEC Engineering and Consulting, Inc. 1