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Chevron U.S.A. - Page S <br /> Each well head was surveyed to establish the surface elevation to a common <br /> r benchmark. The survey was utilized in helping to evaluate accurate ground water <br /> ti <br /> surface elevations for ground water gradient and flow assessment. <br /> 6.0 GEOLOGIC AND HYDROLOGIC SET'T'ING <br /> Based upon review of readily available published data, a geologic and <br /> hydrologic setting has been developed for the subject site area. <br /> 6.1 Geologic Setting <br /> The subject property is located near Stockton, within the San Joaquin Valley <br /> which constitutes the southern portion of the Great Valley Geomorphic Province. <br /> The Great Valley is a topographic and structural basin bounded on the east by the <br /> Sierra Nevada, a fault block dipping gently southwestward. The Sierra Nevada is <br /> composed of igneous and metamorphic rocks of pre-Tertiery age which comprise the <br /> basement complex beneath the valley. The Coast Ranges contain folded and faulted <br /> sedimentary rocks of Mesozoic and Cenozoic age, which are similar to those rocks <br /> that underlie the Valley at depth, and nonconformably overlie the basement <br /> complex. i <br /> Basement rocks in the Valley are overlain by Cretaceous and early Tertiary <br /> aged marine sedimentary rocks. The marine sediments attain thicknesses in excess j <br /> of 15,000 feet (Page, 1986) . Ground water associated with the marine sediments is <br /> considered brackish, and is not generally associated with significant ground <br /> i water production. <br /> i. <br /> tDAMns & Moor. <br />