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r <br /> ; <br /> j. H. KLEINFELDER &ASSOCIATES <br /> r <br /> i <br /> 4 A.EGYONAI• IMDROGEOLOGIC CONDITIONS <br /> The property is located within San Joaquin County, Stockton, California. <br /> Stockton is located near the center of the Great Genkr 1 Valley of <br /> California. This valley has been .formed by the filling of a l,.tge <br /> structural trough or downwarp in the bedrock formations. The trough is <br /> situated between the Sierra Nevada Mountains on the east and the Coast <br /> Range Mountains on the west. Both of these mountain ranges were forma A "y <br /> uplifts which occurred primarily during the Jurassic. and Cretaceous <br /> periods. The sediments which fill the trough originated as erosional <br /> debris from the adjacent mountains and foothills. The bedrock complex is <br /> composed of metamorphosed marine sediments similar to those found in the <br /> foothills of the western Sierra Nevada and the eastern Coast Range <br /> sediments exhibit a fairly complete <br /> Mountains. The overlying <br /> .•cratigraphic section of Cretaceous, Tertiary, and Quanternary deposits <br /> which have a maximum thickness of approximately 9,400 feet beneath the <br /> ' Stockton area. <br /> t Prior to Tertiary time, sediments were apparently deposited in a marine <br /> environment. Changes in sea level and subsequent uplifts resulted in <br /> continental environment. The recent <br /> later deposition of sediments in a cont <br /> I �.:. <br /> sediments have been deposited by flooding of the major rivers: San <br /> Joaquin, Calaveras, Mokelumne, and Sacramento. These rivers flow together <br /> t <br /> in the Sacramento-San Joaquin Delta which presently occupies the area <br /> 'E <br /> between Stockton and Antioch. <br /> 1; <br /> 7 <br /> 53-87-443 <br /> i <br /> T� <br /> i <br />