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Kennedy/Jenks Consultants Other available sources regarding soils underlying the site include: Soils Investigation Report for Proposed Brandy Tanks, Franzia Winery(Kleinfelder, 1974); and the monitoring well boring logs included in Appendix A of this Report. 1.4.2 Hydrostratigraphy Four exploratory borings drilled to depths of 26 feet bgs by J.H. Kleinfelder and Associates (Kleinfelder) in 1974 indicated fill soil underlain with interbedded strata of stiff gray-brown clayey silt and/or medium dense to dense gray to brown silty fine sand. Groundwater was not encountered in any of the four borings (Kleinfelder, 1974). Drillers' logs for five of the irrigation wells at the Facility indicate that the subsurface stratigraphy consists of clay, sand, and rare pea-size gravel. Clay is predominant, with sand-rich units present at depths of approximately 60 to 75 feet bgs;110 to 115 feet bgs, 130 to 155 feet bgs, ► 165 tol75 feet bgs, and 200 to 220+feet bgs. Two of the wells are screened in gravel and coarse sand units at depths of 70 to 80 feet bgs and 160 to 172 feet bgs (Table 2). Boring logs from the three monitoring wells installed at the Facility indicate that the subsurface stratigraphy to about 80 feet bgs consists of clay, sandy clay, sandy silt, and fine-to coarse- grained sand. Sand-rich soils are present from approximately 40 to 70 feet bgs, similar to the subsurface stratigraphy beneath the production wells. The three monitoring wells are screened from 50 to 80 feet bgs (MW-1 and MW-2) and 35.5 to 55.5 feet bgs (MW-3) (Table 3). 1.4.3 Hydrology According to groundwater elevation data obtained from monitoring wells MW-1, MW-2, and MW-3 from 1999 to 2003, the groundwater elevation has ranged from 29.05 feet above mean ` sea level (AMSL) to 50.20 feet AMSL. A summary of the groundwater elevation data is provided in Table 4. �- The groundwater flow direction since December 2000 has typically been to the northwest, and the groundwater gradient ranges from approximately 0.001 to 0.005 vertical feet per horizontal foot. As shown in Figure 5, the groundwater flow direction in October-September 2003 was to the northwest with a gradient of approximately 0.002 feet/feet. Based on calculated gradients in Table 4, MW-1 and MW-3 are considered to be hydraulically ► downgradient of the process water land application areas and upgradient of sanitary wastewater septic tank and leach field systems. MW-2 may be considered to be located hydraulically upgradient of the process water land application areas, although MW-2 is slightly offset to the west and may not accurately represent background water quality directly upgradient of the land ` application areas. Average annual rainfall for the area totals approximately 13 inches based on the Modesto Irrigation District weather station as reported by the California Data Exchange Center(CDEC). The wettest months include December,.January, February, and March with the peak monthly rainfall occurring in January. Based on the Reference Evapotranspiration Map developed by the .- California Irrigation Management Information System (CIMIS), annual evapotranspiration (ET) totals 53.3 inches with the highest ET occurring in April, May, June, July, August and Groundwater Protection Work Plan, The Wine Group Page 1-6 j Franzia Winery, Ripon, California 94s9aW`�!in'ack'D3'A3017G02_winyoup;A9re4wuloohdan;5,��l.ec