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Evaluation of Hydrocarbons May 17, 1990 <br /> Waterfront Redevelopment, Stockton, California AGS 39048-2W <br /> recommended by the California Department of Health Services for benzene in ground water <br /> is 0.001 ppm. No hydrocarbons or volatile organics were detected in soil or ground-water <br /> samples collected from the other two parcels (Applied GeoSystems Report No. 39048-1, <br /> dated October 31, 1989). <br /> I <br /> SITE GEOLOGY AND HYDROGEOLOGY <br /> The site is in the San Joaquin Valley geomorphic province of California. The valley has <br /> been a sedimentary trough since pre-Cretaceous time. Most of the pre-Cretaceous to mid- <br /> Tertiary sediments in this portion of the valley are of marine origin, while the late Tertiary <br /> to Recent sediments consist primarily of continental deposits. Depositional and erosional <br /> sequences were primarily controlled by fluctuations in sea level. Fresh water and brackish <br /> water lakes formed in the valley resulted in the deposition of lacustrine clay over extensive <br /> areas. Higher energy environments, such as rivers and streams, resulted in the deposition <br /> of channel sand and gravel. <br /> The site is underlain by very gently dipping Quaternary fluvial sediments consisting of sand, <br /> silt, and clay. The topographic surface in the area is slightly irregular with a generally <br /> northwestward slope. The nearest surface water is the Stockton Deep Water Channel which <br /> is approximately 300 to 500 feet north of the site. <br /> 5 <br /> Applied GeoSystems <br />