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GEOLOGY AND SEISMICITY Environmental Setting Introduction The project site was investigated for soil and foundation condi- tions deemed relevant to the proposed project by Kleinfelder, Geotechni- cal Consultants. Kleinfelder's report, "Task I: Geologic Hazards Summary and Preliminary Foundation Recommendations, Proposed Falcon Energy Site, San Joaquin County," dated 27 January 1988, is incorporated into this EIR by reference. Geoloav The project site is fairly flat, sloping very gently to the west, with an average elevation of 45 feet. Geologically, the site is located in the central part of the Great Valley geomorphic province of Califor- nia. The valley is situated between the Sierra Nevada on the east and the Coast Ranges on the west. These mountain ranges were formed by uplifts which occurred during the late Tertiary and Quaternary periods. The structural trough or depression in bedrock formations between the ranges has been filled with alluvial , lacustrine, and some marine sediments which attain a maximum thickness of about 30,000 feet near the western margin. The bedrock complex is composed of metamorphosed marine sediments similar to those found in the foothills of the western Sierra Nevada and the core of the Coast Ranges. The portion of the valley in the site area exhibits a fairly complete stratigraphic section of Cretaceous, Tertiary and Quaternary deposits. The sediments deposited prior to mid-Tertiary time were in a marine environment. Changes in sea level , valley filling, and uplift, resulted in deposition of sediments in a continental environment after mid-Tertiary time. These continental sediments are exposed at the surface in the site area. Near-surface sediments in the Lodi area have been deposited primarily during flood stages of the many sloughs and creeks in the area, prior to the present-day flood-control systems. 3-45 101-44.R3 4/10/89