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i ------------- <br /> w <br /> Background Information <br /> NOMELLINI CONSTRUCTION CO. <br /> 1045 West Charter Way, Stockton, California <br /> SITE LOCATION AND DESCRIPTION <br /> The site is located at 1045 West Charter Way in an industrial area of southwest Stockton, <br /> approximately one-half mile west of Interstate 5 along West Charter Way. The site is further <br /> described as being located northwest of Section 10, Township 1 North, Range 6 East, Mount Diablo <br /> Base and Meridian. <br /> The site is occupied by a rectangular warehouse building structure utilized by various industrial and <br /> commercial businesses. Surrounding land use is light industrial/commercial. A truck stop is located <br /> immediately east of the site; the property immediately west of the site is operated by Sunrise <br /> Sanitation. <br /> REGIONAL GEOLOGIC SETTING <br /> The site is located in the eastern portion of the Great Valley geomorphic province of California. The <br /> valley is a nearly flat, elongate trough trending northwest and southeast for approximately 450 miles. <br /> The Valley is enclosed by the igneous Sierra Nevada to the east and the sedimentary and <br /> metamorphic Coast Ranges to the west. The surficial and upper several hundred feet of subsurface <br /> layers consists of great thickness ofpredominantly unconsolidated alluvial and floodplain deposits <br /> (dominantly sands, silts, and clays) of Quaternary age, which are derived from the predominantly <br /> granitic mountains of the Sierra Nevada. Beneath the upper sedimentary deposits lie a thick <br /> sequence of marine deposits of Mesozoic age. These units are further underlain by a pre-Jurassic <br /> complex of igneous and metamorphic basement rock. <br /> GROUND WATER DEPTH AND FLOW DIRECTION <br /> Between 1991 and 2005, the water-table surface beneath the site has generally increased from <br /> approximately 33 feet to 12 feet bsg. The uppermost ground water flows in a unconfined aquifer. <br /> With increasing depth, the aquifer becomes semi-confined due to the presence of mixed <br /> heterogeneous layers of sediments. <br /> Between 1991 and 2005, ground water monitoring data at the site remained relatively constant with <br /> a general ground water flow direction towards the northeast. Relative ground water elevation maps <br /> for the site have been included in previous Quarterly Reports prepared by AGE. <br />