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Kennedy/Jenks Consultants the 5 to 7-foot depth in the soil borings located in the LAAs, however silty material was encountered at 21 feet bgs and 17 feet bgs in two borings. Two predominant soil types, which mainly differ in clay accumulation and subsurface properties, include the Delhi loamy sand and the Veritas fine sandy loam. According to boring descriptions reported by Twining, Inc. (Twining, 2000), the majority of LAA basins 1, 2, 5 and 6, and the northern half of basin 3 may be occurring in soils mapped as Delhi. The majority of LAA basins 4 and 7, as well as the southern half of basin 3 may be in soil mapped as Veritas soils. These preliminary soil type delineations were estimated using the presence of cemented material in boring logs to separate soil types. According to the San Joaquin Soil Survey, cemented material is associated with the Veritas soil. The presence of cemented material will be further investigated during lysimeter installation. There is a high percentage of sand in both soils, so the available water capacity for both soils has been estimated between 0.08 and 0.17 (in/in) (USDA, 1992). Water runoff of the soils is slow and since the area has slopes ranging from 0-3%, the hazard of soil erosion by runoff is considered slight. Permeability rates have been estimated to range from 2.0 to 20 inches per hour, which is considered moderately rapid. The effective rooting depth of the soils has been estimated at approximately 60 inches (USDA, 1992). The depth to groundwater has been measured at approximately 58 feet (Twining, 2000). Rainfall and evapotranspiration (ET) data were collected as part of the water balance calculations for the process water at the Site (Kennedy/Jenks, 2003). These values, which are believed to be representative of rainfall at the Facility, were collected at the nearby Manteca CIMIS station (Station 70). Other information for the Site including engineering properties, water management, and soil physiochemical properties can be found in the San Joaquin County, CA, Soil Survey (USDA, 1992). According to estimated data from the San Joaquin Soil Survey (USDA, 1992), soil type and climate are conducive for process water treatment using application of winery effluent to LAAs. A general description of the physical and chemical properties for the different soil types underlying the Site was obtained from the Soil Survey of San Joaquin County, California, (USDA, 1992). 1.6 Regional Setting 1.6.1 Hydrogeology The Central Valley regional aquifer system of California is a 400-mile long, northwest-trending asymmetric trough, averaging 50 miles in width. The significant water-producing geologic units in the valley are the unconsolidated to semi-consolidated non-marine sediments ranging from approximately 25 million years in age to present. The west side of the trough is bounded by pre- Tertiary and Tertiary marine sedimentary rocks of the Coast Ranges. The east side of the valley is underlain by pre-Tertiary igneous and metamorphic rocks of the Sierra Nevada foothills (San Joaquin River Group Authority 1999 (SJRGA 1999)). The southern two-thirds of the Central Valley is referred to as the San Joaquin Valley. The San Joaquin Valley basin contains up to six vertical miles of unconsolidated sediment, of which the top 2,000 feet contain freshwater. As lakes filled and drained over the last 24 million years, laterally extensive clay units were deposited, forming barriers to vertical groundwater Groundwater Investigation Work Plan Page 7 Barrel Ten Quarter Circle Winery, Escalon, California g:Bs-groupladn int ob1031030118.08_barrenenl09-reportslgw invest wrk pinVextdoc