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1% Eli N%!=_ SW1 3 0 ENVIRCN'I ENTAL G 3, t GEOLOGY Valle The site lies in the center of the Creat `down warped and Geomorphic province• The valley has been da '� +a filled with material eroded from the surrounding mountains times. s a result, the central Part of since pxe-Cretaceous ra the valley is fil:.ed with several Hundred feet of consolidated and unconsolidated sediments tCalif• dl�'R. 1978; Olmsted et al . , 1961 ; USGS, 1981 , 19841 . j units in the vicinity of Rainbo Bakery Important water-beating and Victor rc�rmations . include the idehrterl, Laguna, Tulare, t The tap of the Mehrten ranges from 820 o 0 ft ft deep in the central part of the valley and is . about 590 ft Chic:. . The ` nonvolcanic Laguna =ormati.on overlies the andesitic lrehrten on the eastern side of San Joaquin County, and variest�:eam-'•aid unit s fro:i 430 to 1 ' 000 ft in thio'.{ness . The Laguna unit is a of discontinuous sand and silt lenses with lesser amounts of i. become finer Drained sediments j." clay and gravel. The Laguna toward the center of the basin where the formation merges with the Tulare. The contact the equivalent west--side formations ing layer, the is near the San Jc;aquir. River . A thick lay"confby drillers ) , is Corcoran clay (usually logged as "blue clay y The thick,�ess of found near the top of the Tulare Formation 160 ft (Calif . 4 . the clay varies from app roximately 0 ft to _ ` 1978; Olmsted et al. , 1961 ; USGS, 1981 , 1584 ) - Laguna on the eastern side The victor Formation lies over the variesft thick.. The. s , of the cou ;ty. It varies from 0 which are sediments are alluvial fan and in`Formatfan ion. However, the generally coarser than the Laguna silt, and interfan areas contain large amounts Of fxneindistinguishable. clay, making the two formations practically _ 1� rifer is considered semiconfined because of The aq E 3-1