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1 <br />' 3 REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> The site is underlain by the Modesto Formation, which is composed of alluvial sediments <br /> that range in size from gavel to sand and silt (Marchand and Allwardt, 1977) The <br /> Modesto Formation dips gently to the west (Wagner, et al , 198 1) The site is in the <br />' Eastern San Joaquin County Ground-Water Basin (California Department of Water <br /> Resources, 1980) According to SJCPHS, the regional groundwater gradient is to the <br /> southwest The groundwater basin has been developed for intensive irrigation and for <br />' domestic, industrial, municipal, and stock use <br /> The local surface drainage includes the Mokelumne River and the South Main Canal The <br />' Mokelumne River is located approximately 1 mule north of the city of Lodi and drains to <br /> the west The South Main Canal is located approximately 3 miles west of the site and � <br /> flows to the south <br /> i <br /> r <br /> SA('\N\P10�0805Y18051420 4135-97\prz l Rev 0 3112)97 <br /> 20805 142 004 3-1 <br />