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r <br /> AM 'W_ <br /> Working To Restore Nature <br /> 3.0 REGIONAL GEOLOGY AND HYDROLOGY <br /> The site is situated in north Stockton in the northeast corner of the southwest quarter of Section <br /> 16, 72N, R6B, San Joaquin County, California Regionally the property is located in the San <br /> Joaquin Valley physiographic province. The valley is a topographic and structural basin <br /> ' bounded on the east by the Sierra Nevada and on the west by the Coast Ranges. Locally the <br /> topography slopes gently toward the southwest at approximately 6 feet per mile. <br /> 1 <br /> The near surface geology of the region is comprised of unconsolidated alluvial deposits of <br /> rPleistocene to Holocene age. These deposits, sometimes referred to as the "older alluvium", <br /> consist of intercalated beds of gravel, sand, silt and clay. Underlying the older alluvium are <br /> ' Pho/Pleistocene continental deposits of similar derivation and hthology. The older alluvium <br /> functions as the most important aquifer in the site area (USGS Professional Paper 1401-C, <br /> ' 1986). Soils developed on the alluvium are generally well drained, differing from the parent <br /> material only in the increased volume of organic matter (DWR Bulletin No 146, 1967). <br /> The important bodies of surface water in proximity to the site are Fivemile Creek, Mosher <br /> Slough, and the Calaveras River. Fivemile Creek and Mosher Slough, respectively, are located <br /> approximately 600 feet southeast and 2,700 feet north of the site. These two waterways flow <br /> ' in a westerly direction. The southwest flowing Calaveras River is located approximately 2.6 <br /> miles south of the site and is a tributary of the San Joaquin River. The Calaveras River <br /> generally exhibits moderate stream flow losses over portions of the year which contributes to <br /> groundwater recharge (USGS Professional Paper 1401-D, 1989). Existing and potential <br /> rbeneficial uses of these surface water bodies include municipal and domestic water supply, <br /> irrigation, stock watering, industrial supply, groundwater recharge, freshwater replenishment, <br /> recreation, freshwater habitat, wildlife habitat, fish migration, and fish spawning (CRWQCB <br /> Water Quality Control PIan, 1991). <br /> ' The existing and potential uses of groundwater in the area include irrigation, private and <br /> municipal water supply, stock watering, process water, and service supply (CRWQCB Water <br /> 1500 8XIMPORMCAP-0794 DRF 2 <br /> 1 <br />