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Kennedy/Jenks Consultants The Wine Group and previous owners historically discharged winery process water to a series of evaporation/ percolation basins located south of the Facility (see Figure 2) during the period from 1935 to 1995. In 1995, the Facility eliminated the practice, of treatment and disposal of process water in the basins and instead began to pretreat the process water for solids removal and discharge to approximately 286 of the 330 acres of the Facility's vineyards for treatment and reuse as vineyard irrigation. A portion of the former evaporation/percolation basins area was converted to an approximate 12.6 acre-feet emergency discharge reservoir where process water and stormwater could be diverted in high-Flow or emergency situations. During the non-irrigating season, typically October through March, the process water has been applied to a network of furrows in the vineyard using a piping manifold with various risers and valves located at the end of 3-foot wide by 2-foot deep triangular furrows that are plowed between the vines. Once the process water has been applied to a furrow, the valve is closed and another valve at the end of the next furrow is opened. By utilizing such an alternating pattern for process water disposal, the Facility can evenly distribute process water over the 286 acres of vineyards and achieve sufficient evaporation, treatment, and percolation of process water in soils beneath the vines prior to the next application. Between each process water application, each furrow is allowed to dry and then plowed with a disc within 10 to 30 days after the field is dry prior to the next process water application. During the irrigating season, typically April through September, the Facility has supplemented process water with water from South San Joaquin Irrigation District (SSJID) or irrigation wells to meet the water demands of the vineyards. 5.4.2 Soil Treatment of the process water primarily takes place in the soil; therefore, an evaluation of the site soils' ability to treat the process water is warranted. The following sections outline the necessary steps for soil evaluation. 5.4.2.1 Soil Types According to the USDA, there are three soil types at the Facility and surrounding vineyards: _ Honcut, Delhi, and Veritas. Figure 4 provides an areal map of the site depicting approximate locations of the three soil types (Section 1.4.1 of this Work Plan includes a description of the various soil types). Veritas soils are located in the northern vineyards and cover the smallest portion of the total vineyards. Honcut and Delhi are intermingled over the remaining vineyards and cover approximately equal portions of the vineyards. 5.4.2.2 Soil Quality Estimates of the physical and chemical properties of the soils are included in the October 1992 Soil Survey for San Joaquin County, California (USDA, 1992). A soil sampling program will be initiated at the Wine Group to confirm the assumptions found in the USDA soil survey. Groundwater Protection Work Plan, The Wine Group Page 5-2 Franzia Winery, Ripon, California