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Work Plan for Environmental Investigation June 21, 1989 <br /> Waterfront Redevelopment, Stockton, California AGS 39048-1W <br /> SITE GEOLOGY AND HYDROGEOLOGY <br /> The site is in the San Joaquin Valley geomorphic province of <br /> California. The valley has been a sedimentary trough since pre- <br /> Cretaceous time. Most of the pre-Cretaceous to mid-Tertiary <br /> sediments in this portion of the valley are of marine origin, <br /> while 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 water <br /> and brackish water lakes formed in the valley resulting in the <br /> deposition of lacustrine clay over extensive areas. Higher <br /> energy environments, such as rivers and streams, resulted in the <br /> deposition of channel sand and gravel. <br /> The site is underlain by very gently dipping Quaternary fluvial <br /> sediments consisting of sand, silt, and clay. The topographic <br /> surface in the area is slightly irregular with a generally <br /> downward northwestward slope. The nearest surface water is the <br /> Stockton Deep Water Channel which is approximately 300 to 500 <br /> feet north of the site. <br /> 4 <br /> Applied GeoSystems <br />