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Chevron U.S.A. <br /> Page 10 <br /> quantities of water to wells. The Mehrten Formation attains a maximum thickness of <br /> 1200 feet in the San Joaquin Valley and according to U.S. Geologic Survey Mapping, <br /> _ underlies the subject property. <br /> - i <br /> According to Department of Water Resources (DWR) and the San Joaquin County Flood i <br /> Control and Water Conservation District map entitled"Ones of Equal Elevation of <br /> Water in Wells, Spring, 1987"groundwater occurs at an elevation of approximately-15 <br />- y feet. The elevation of the site is approximately 10 feet,which suggests that in the <br /> study area groundwater occurred at a depth of approximately 25 feet In 1987. However, <br /> due to persistent drought conditions of recent years,groundwater is dropping and, <br /> based on Dames&Moore's recently constructed wells at the subject site,has dropped <br /> to a depth of nearly 39 feet below the study area. <br /> The general geology around the t-t::,jy site consists of a thick sequence of river <br /> M channel and flood plain deposits. These sequences contain interbedded sand, gravel, <br /> r., <br /> silt and clay layers. The U.S. Department of Agriculture Soil Conservation Service <br /> (SCS) has classified soils in this particular region of the Delta and, due to their <br /> complexity, are categorized as urban soils in this area of Stockton. There are <br /> i several water bearing zones underlying the site. The shallowest water occurs at a <br /> depth of approximately 39 feet, the deepest water bear;ng zone is more than 1000 feet <br /> i deep. <br /> r <br /> { <br /> i <br /> 16004-206-044 <br /> D:��tta ti htt�s�ut: <br />