Laserfiche WebLink
Ireralwan. SACRAMENTO <br /> depicted in Figure 2-3. The facility was built and first operated in <br /> 1964 as a Pacific Bell switching station. The diesel fuel stored in the <br /> UST prior to removal was used to power stand-by generating equipment. <br /> 2.2 Surface Water <br /> The nearest surface water to the Pacific Bell facility is the <br /> westward flowing Calaveras River located approximately 100 yards to the <br /> south. <br /> 2.3 Geology <br /> The Pacific Bell facility is located in the Great Valley <br /> physiographic province. The Great Valley consists primarily of <br /> alluvial , flood, and delta plains formed by the valley's two major <br /> rivers and their tributaries, one of the tributaries is the Calaveras <br /> River. The resulting topography of the area is broad and flat with an <br /> average elevation at the facility of 48 feet above mean sea level (MSL) . <br /> The area is underlain by sands, silts, clays, and gravels of nonmarine <br /> origin, which are of Quarternary age. These sediments are generally <br /> loosely consolidated. Run-off of surface water is slow and erosion is a <br /> slight hazard. <br /> Based on borehole data, the following generalized soil stratigraphy <br /> was identified at the Pacific Bell Stockton facility. From the ground <br /> surface to a depth of 12.0 feet is a brown, very silty sand. This is <br /> underlain by a light brown, sandy, clay-rich silt to 18.0 feet below the <br /> surface. Below the sandy, clay-rich silt, from 18.0 to 24.0 feet exists <br /> a brown, clay-rich, sandy silt. This is underlain by a medium brown, <br /> clay-rich, very sandy silt from 24.0 to 32.0 feet below the surface. <br /> From 32.0 to 40.0 feet below the surface exists a light brown, sandy, <br /> very silty clay. The deepest borehole terminated in a medium gray, <br /> slightly sandy, clay-rich silt at 41 .5 feet below the surface. <br /> 4 <br />