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' Feasibilay Study Report 1140 W. Hammer Lane, Stockton, CA ' 3.0 REGIONAL GEOLOGY AND HYDROLOGY The site is situated in north Stockton in the northeast corner of the southwest quarter of Section 16, T2N, R6E, San Joaquin County, California Regionally the property is located in the San Joaquin ' Valley physiographic province The valley is a topographic and structural basin bounded on the east by the Sierra Nevada and on the west by the Coast Ranges Locally the topography slopes gently toward ' the southwest at approximately 6 feet per mile The near surface geology of the region is comprised of unconsolidated alluvial deposits of Pleistocene ' to Holocene age These deposits, sometimes referred to as the "older alluvium", consist of intercalated beds of gravel, sand, silt and day Underlying the older alluvium are Pho/Pleistocene continental i ' deposits of similar derivation and lithology The older alluvium functions as the most important aquifer in the site area (USGS Professional Paper 1401-C, 1986) Soils developed on the alluvium are generally well drained, differing from the parent material only in the increased volume of organic matter (DWR Bulletin No 146, 1967) The important bodies of surface water in proximity to the site are Fivemile Creek, Mosher Slough, and the Calaveras River Fivemile Creels and Mosher Slough are located approximately 600 feet southeast and 2,700 feet north of the site, respectively These two waterways flow in a westerly direction The southwest flowing Calaveras River is located approximately 2 6 miles south of the site and is a tributary of the San Joaquin River The Calaveras River generally exhibits moderate stream flow losses over portions of the year, which contributes to groundwater recharge (USGS Professional Paper 1401-D, 1989) Existing and potential beneficial uses of these surface water bodies include municipal and 1 domestic water supply, irrigation, stock watering, industrial supply, groundwater recharge, freshwater replenishment, recreation, freshwater habitat, wildlife habitat, fish migration, and fish spawning ' (CRWQCB Water Quality Control Plan, 1994) ' The existing and potential uses of groundwater in the area include irrigation, private and municipal water supply, stock watering, process water, and service supply (CRWQCB Water Quality Control ' Plan, 1994) The "older alluvium" is the most extensively developed geologic urut in the area and hosts both unconfined and confined zones The unconsolidated, mostly coarse-grained nature of the aquifer G 1Dntn\6R0UNDZEIKN0WL.E5 HAM\REMIA 1rea9ibi6ryReport dos. ' 2