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June 7, 1988 AGS Job No. 038033-•1 <br /> Marlowe Properties, Stockton, California <br /> GEOLOGY <br /> The site is located_in the Great Central Valley geomorphic <br /> province of California on the ancestral delta of the San Joaquin <br /> River. The Central Valley has been a sedimentary trough since <br /> pre--Cretaceous time. Most of the pre-Cretaceous to mid-Tertiary <br /> sediments in this portion of the valley are of marine origin while <br /> F' the late Tertiary to Recent sediments consist primarily of <br /> continental deposits. Depositional and erosional sequences were <br /> primarily controlled by fluctuations in sea .level. Fresh and <br /> brackish water lakes formed in the valley resulting in the <br /> deposition of lacustrine clay over extensive areas. Higher energy <br /> environments, such as rivers and streams, resulted in the <br /> deposition of channel sand and gravel. <br /> The project site is underlain by very gently dipping Quaternary <br /> a� fluvial sediments consisting of sand, silt, and clay. The <br /> topographic surface in the area is slightly irregular with a <br /> -generally southwestward slope. The nearest surface water is the <br /> 6V Stockton Diverting Canal approximately I mile southwest of. the <br /> site. The canal is unlined and flows to the northwest. Flow data <br /> _.for the canal obtained from the California Department of Mater <br /> Resources indicates that most of the annual flow occurs between <br /> 4 <br /> to <br /> APPlieo° GeoSystems <br />