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(water with some gasoline) was removed from the tank during tank <br /> removal activities The tank was severely corroded and contained <br /> several holes It was of single wall steel construction and was <br /> apparently used to store gasoline There is no information available <br /> to indicate the total quantity of product that was released from the tank Soil and grab water samples obtained from the tank excavation <br /> indicated the presence of total petroleum hydrocarbons as gasoline <br /> and diesel, and total xylenes (Table 2-1) <br /> Gxeopaphy <br /> Thearcel is situated <br /> P within the port area of the City of Stockton, San <br /> Joaquin County, California. The Stockton Deep Water Channel <br /> bounds the property immediately to the north, and former tank site <br /> #3 lies adjacent to the property on the west. Elevations range from a <br /> few feet above sea level along the Stockton Channel waterfront to <br /> approximately 10 feet above mean sea level (MSL) along West Weber <br /> Avenue <br /> Geo�og� <br /> On a regional basis, the West Weber property lies within the Great <br /> Valley geomorphic province of California. The Valley is an <br /> asymmetric synchlinonum containing up to 60,000 feet of sediment <br /> along the western margin The sediments consist of marine and <br /> nonmarine late Triassic to early Tertiary clastic material Late <br /> Tertiary to Present Age sediments are exclusively of non-manne <br /> clastic deposition in a variety of alluvial-fluvial environments The <br /> present day surface outcrop of geologic units in the Stockton area <br /> reflects the Late Tertiary alluvial valley fill derived from the San <br /> Joaquin River The fill probably extends to a depth of several <br /> hundred feet <br /> Site-specific geological information in the vicinity of the property is <br /> limited to that developed during investigations of former tank sites <br /> #1, #2 and #3, as described below. <br />�. At the former tank site #2, two general soil types were encountered. <br /> From the ground surface to a depth ranging between approximately <br /> 10 and 20 feet, the soils consisted of semiconsolidated silts and clays <br /> Below this layer, and to the depth explored, the soils consisted of <br /> unconsolidated sand with minor amounts of silt and gravel <br /> 2-2 <br />