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i Kennedy/Jenks Consultants I 2.3.1 Soils L Soils beneath the facility have been characterized using three sources of information: 1) 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 (Soil Survey) published by the United States Department of Agriculture, Soil Conservation Service (SCS 1992); 2) in-situ soil boring log data collected and previously reported to the CRWQCB (Condor 2002); and 3) soil boring data collected during previous onsite monitoring well installations. ` 2.3.1.1 Soil Conservation Service Data The USCS San Joaquin County Soil Survey maps indicate that most of the facility is underlain by either the Devries Sandy Loam or Guard Clay Loam. The SCS describes these soil series as w generally poorly drained, moderately coarse-textured and moderately fine-textured soils that are moderately deep to a cemented hardpan or are very deep, and that have been drained in most areas. These soils, which are distributed over an area much larger than the facility, formed in L alluvium derived from mixed rock sources. Both soils are subject to rare flooding. The SCS describes the Devries soils as 20 to 40 inches deep to a cemented hardpan and somewhat poorly drained. The surface layer and subsoil are moderately coarse textured and `' depth to water table is more than 5 feet. The permeability ranges from 2 to 6 inches per hour. (SCS 1992). 6.%w The SCS describes the Guard soils as very deep and poorly drained, calcareous throughout with weakly cemented layers below a depth of 15 inches. The water table is at a depth of 1.5 to L 3 feet in most areas but has been drained to more than 5 feet depth where water from drainage ditches is pumped into the adjacent sloughs and rivers. The upper 15 inches of soil has a permeability of 0.2 inches per hour to 6.0 inches per hour and the soil from 15 inches to 72 inches depth has a permeability of 0.06 inches per hour to 0.2 inches per hour(SCS 1992). 2.3.1.2 Data from Previous Monitoring Well Construction L The monitoring well construction logs for onsite wells generally indicate the subsurface consists of a mixture of silty or clayey layers, although well-graded sand was encountered in well GW-6 from about 11 feet bgs to the total depth of the boring. Poorly graded sand was reported for much of the screened interval in GW-9, with lesser thicknesses reported in wells GW-10, GW-11, GW-12, GWA5, and GWA8. Well construction logs do not indicate the existence of hardpan layers (Condor 2002). L In the absence of additional data, it is assumed that similar lithologic conditions exist to the west of the facility where the new proposed LAAs are located. L" 2.3.1.3 2008 Soil Characterization Kennedy/Jenks advanced eleven borings to characterize soils and shallow groundwater L beneath the 150-acre field and vineyard immediately north of the facility in September 2008. Of these borings, three borings located in each of the two soil units identified by the SCS were ,o selected to provide samples to further characterize soil conditions. L. Monitoring Well Installation Work Plan Page 5 V Sutter Home Winery, Lodi, California O:Ys-graDb4�nyob10610666W5.13 SUMbone`A4epmnNrvrlmlalLwpVeAtEa