Laserfiche WebLink
Regional Hydrogeology <br /> The site lies at an elevation of approximately 47 feet above mean sea level and is <br /> located in San Joaquin County,in the northern portion of the San Joaquin Valley. The <br /> San Joaquin Valley is a broad, alluvium-filled structural basin bounded to the east by <br /> the Sierra Nevada Mountain Range and to the west by the Coast Range. The total <br /> thickness of alluvial fill in the valley is thousands of feet. The alluvial sediments <br /> generally consist of poorly sorted silt and fine sand with less extensive lenses of medium <br /> to coarse-grained sand and gravel. Quaternary lacustrine deposits also occur in the <br /> central and western portions of the valley,and consist of clay,silt,and sand. <br /> In the vicinity of the site, surficial deposits are characterized as low alluvial plain and <br /> fan deposits. These deposits generally are less than 10 feet thick and consist of silts, <br /> fine sands, and less extensive coarse sand and gravel lenses. Underlying deposits are <br /> referred to as older alluvium and reach a thickness of up to 400 feet. These deposits <br /> consist of interbedded clay, silt, sand, and gravel. Groundwater.fiow direction beneath <br /> the site is anticipated to be northerly,..based on regional drainage patterns and <br /> F topography <br /> i <br /> r <br /> e <br /> i <br /> _ E <br /> f <br /> i <br /> { <br /> �J <br /> —3103141/REPORT---- --- Y Februar 13,1991 <br /> -- <br /> -2- --- ----- --- ---- -_ - -- ---- <br />