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15 April 2009 AGE-NC-09-1683 Page 6 of 18 estimated as six gallons per day per person and visitor usage was estimated as three gallons per day per person. I 4.0. GROUND WATER INFORMATION-REGIONAL HYDROGEOLOGY According to the Geologic Map of California,published in 1966 by the California Department of Conservation Division of Mines and Geology, the site is within the Great Valley Geomorphic Province(GVGP)of California,a large,elongate,northwest trending structural trough.The GVGP is subdivided into two major divisions designated the Sacramento and San Joaquin Valleys,which have been filled to the present elevation with thick sequences of sediment ranging in age from f Jurassic to present day, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada Mountains, respectively. The United States Department of Agriculture Soil Survey of San Joaquin County, California(1992) indicates the soil type for the site as Tokay, a fine sandy loam with 0 to 2 percent slopes (#256). Tokay soil has been denoted as very deep and very well drained and nearly level soil. Permeability is moderately rapid in Tokay soil. The pH level of Tokay soil ranges between 6.1 - 8.4 units with a salinity of less than 2.0. Tokay soil generally consist of verywell drained moderate coarse oarse textured soils that are deep to a cemented hardpan. Tokay soils generally formed in alluvium derived from granitic rock sources. The Modesto,Riverbank,Turlock Lake Formations and overlying recent alluvium are the principal source of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest surface water feature in the vicinity of the property is the South Main Canal, located approximately 1 mile northeast of the site. 4.1. GROUND WATER DESCRIPTION FOR THE GENERAL AREA 2 The San Joaquin County Flood Control and Water Conservation District's Lines of Equal Depth to Ground Water-Fall 2008 indicate depth to ground water in site vicinity as between 40 feet and 50 (`r' /J feet below surface grade(bsg)and a general ground water flow direction towards the southeast. As part of an ongoing ground water investigation at 2448 Kettleman Lane(0.72 miles east of the site), between the years 2003 and 2007, depth to water ranged from 45 feet to 52 feet bsg with ground water flow predominantly towards the south-southwest. Advanced GeoEnvironmental,Inc.