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smslow &I <br /> 02��_ffl011 EM <br /> y <br /> Tri-Valley Growers November 9, 1987 <br /> r Project No. 1 M2G Page 3-1 <br /> SECTION 3.0 <br /> j + <br /> OEM QUAL GEOL921A D Hy0801 <br /> t <br /> The project site lies at the southern end of the Sacramento Valley, part of <br /> po <br /> the large northwest trending asymmetric structural trough termed the <br /> Central Valley of California. The Sacramento Valley contains a thick <br /> sequence of sediments which, in. ,r lines, reach a depth of 10 miles. These <br /> sediments range in <br /> k; <br /> g geologic age from Jurassic (205 million years before <br /> present) to Holocene (present time) and include both marine and continental <br /> I <br /> rocks and deposits (Page, 1986) <br /> The project site is located on Holocene river deposits that have been <br /> 1 <br /> produced by the nearby Mokelumne River and its ancestor channels. <br /> According to the California Department of Water Resources (1978, p. 33) <br /> ' these river deposits attain a maximum thickness of approximately 115 feet <br /> »: <br /> and are the most permeable deposits in the Sacramento Valley. <br /> r = This site is located approximately one-half mile west of the Mokelumne <br /> i <br /> River. The river in this location flows generally to the northwest and is <br /> 4 subject to periodic flooding. In recent years, the project site was flooded <br /> when the river overflowed its banks (personal communication with Mr. Juan <br /> r = <br /> Quijano). The regional groundwater flow if generally towards the Mokelumne <br /> - - -- River to the north; however; the flow is also surmised to be affected by .ocal <br /> ` pumping wells and possible tidal influence. <br /> r <br /> ee <br />