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lkFeoph,%,vepirNc. SACRAMENTO 2 . 0 ENVIRONMENTAL SETTING 2. 1 Site Location and Description The Pacific Bell facility is located at 7644 Ashley Road, ' Stockton, California, (Pacific Bell facility number UE-132) . The facility has been in operation as a switching station since 1964. The facility is located in a rural area of San Joaquin County, ' approximately two miles east of Highway 99 and just north of the Calaveras River. 1 The site is flat lying with a very slight slope to the northeast and an average elevation of approximately 48 feet above ' mean sea level. The site consists of a single-story building and a fenced, asphalted yard on the northeast side of the building. ' The facility was manned until an automated switching system was installed during the first part of 1991 ; the facility is currently unmanned. The southwest portion of the site was landscaped at one time, however, the UST removal and subsequent irrigation system failure have returned this area to its natural state of bare earth with minor patches of bermuda grass. 2 .2 Regional and Site Geology ' The Pacific Bell facility is located in the Great Valley physiographic province. The Great Valley is a massive geologic ' sequence, consisting primarily of alluvial , flood, and delta plains formed by the valleys two major rivers (the Sacramento IRiver and the San Joaquin River) and their tributaries, one of which is the Calaveras River. The resulting topography of the area is broad and flat with an average elevation at the facility of 48 feet above mean sea level . The area is underlain by sands, silts, clays, and gravels of nonmarine origin, which are of Quaternary age (Norris and Webb, 1991) . These sediments are generally loosely consolidated. Runoff of surface water is slow and erosion is a slight hazard. I 4