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This well was located visually, however the DWR files contained no records of this well The information provided by DWR did not provide accurate locations of any of the nearby wells 3.0 REGIONAL GEOLOGY AND HYDROLOGY The site is situated in central Escalon 1n Section 4, T2S, R9E, 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 west at approximately 5 feet per mile The near surface geology underlying the site 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 clay The thickness of the older alluvium in the Escalon area averages approximately 450 feet Underlying the older alluvium are Plio/Pleistocene continental 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 the Stanislaus, Tuolumne, and San Joaquin Rivers The Stanislaus and Tuolumne Rivers, respectively, are located ' approximately 2 112 and 10 1/2 miles south of the site These two rivers flow in a westerly direction and are tributaries to the San Joaquin River, located approximately 14 miles west of the site The northerly flowing San Joaquin River drains the San Joaquin Valley All three of these rivers are gaining streams over portions of the year and derive a portion of their flow from ' groundwater influx (USGS Professional Paper 1401-C, 1986) Existing and potential beneficial uses of these surface water bodies include minimal and domestic water supply, irrigation, ' industrial supply, groundwater recharge, freshwater replenishment, hydroelectric power, 1500471RFMR'MCAP 0694 FNL 2