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u 22 November 2006 AGE-NC Project No. 95-0167 — Page 2 of 15 i southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, '! respectively. The Province is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. L _J The Great Valley has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley. The sedimentary formations range in age from Jurassic to Recent, with the older deposits being primarily marine in origin and the younger deposits continental. Continental-derived sediments were primarily deposited in lacustrine, fluvial, and alluvial environments with sediment sources being the mountain ranges surrounding the valley (Olmsted and Davis, 1961 ); the site itself is located on unconsolidated and semi-consolidated alluvium, lake, playa, and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) . Rocks composing the basement complex of the Province have not been completely -- defined but are believed to be metamorphic and igneous in origin. 2 .4. LOCAL GROUND WATER SETTING The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the L principal sources of domestic ground water in the 13 ,500-square mile San Joaquin Valley Ground -� Water Basin (Basin 5-22). The ground water at the site generally flows in a northwesterly direction and is found at a depth of 13 feet to 16 feet below surface grade (bsg) . The prevailing ground water flow direction in central Stockton is generally toward the northeast; however, localized ground water ( � flow direction may vary during winter/summer cycles and tidal fluctuations. Ground water is considered to be of beneficial use and is utilized for domestic, industrial, and commercial purposes. Depth to ground water information is summarized on Table 3 . (J 2.5 . MUNICIPAL WELL SURVEY J Drinking water near the site is supplied by the City of Stockton municipal wells. California Water Service Company (Cal Water) maintains a municipal well and tank approximately 1 ,700 feet west j I of the site at Lindsey Street and Edison Street. No other municipal wells maintained by the City of '— Stockton or Cal Water are located within 2,000 feet of the site. The nearest municipal well located down-gradient from the site is approximately 2,400 feet northeast of the site on East Poplar Street, between San Joaquin Street and Hunter Street. First encountered ground water is not used for --1 drinking or irrigation. I IJ Advanced GeoEnvironmental, lnc. LI