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Kennedy Jenks Consultants 1, proximity of certain wells to the Delta with its poorer quality water and the proximity of certain +11 wells to agricultural activities and food processing operations. '. 2.2.6 Facility Geology i Condor installed the seven groundwater monitoring wells near the 15.5-acre land application area and at other locations within the facility in 2002. Three additional groundwater monitoring wells were installed to evaluate the sanitary wastewater mound system. The shallow subsurface stratigraphy at the facility has been recorded on well construction logs from the seven monitoring wells installed in 2002 and the soil borings advanced in 2008 on the two parcels � immediately north of the facility. l s Kennedy/Jenks advanced ten soil borings on the 150-acre adjacent parcel numbers 011-090-14 and 011-150-23 located immediately north of the facility. Figure 4 shows the locations of the existing groundwater monitoring wells and recent soil borings. Monitoring well construction details are summarized in Table 3. Wells and soil borings have been drilled to characterize the first-encountered groundwater beneath the facility and two northern parcels. Groundwater is generally encountered at depths of less than 10 feet bgs, so wells and borings have only been drilled to a maximum of 16.5 feet bgs. The well construction logs indicate the well borings were sampled with an 18-inch long split spoon sampler starting at about five feet bgs. The soil borings were drilled using a continuous coring system (Condor 2002). Generally the subsurface consists of a mixture of silty or clayey layers. Well-graded sand was encountered in well GW-6 from about 11 feet bgs to the total depth of the boring but this sand layer was not observed in nearby boring KB-8, or in well GW-5 or GW-7. In many of the soil borings, the upper eight to nine feet consisted of silty sand and in borings KB-4 and KB-6 the entire 10 feet of the boring consisted of silty or well-graded sand. The clay and silt soils logged in the soil borings were very stiff to stiff and typically had low to no plasticity. 2.2.7 Facility Hydrogeology In the soil borings, the first-encountered groundwater was typically observed at the base of the ` silty sand just above a deeper clay or silt layer. Groundwater was also observed in the clay and silt layers If sand was absent. The stabilized groundwater levels in the wells indicate that the shallow aquifer is unconfined. 2.2.7.1 Groundwater Gradient Groundwater monitoring data indicate that the groundwater flow direction at the facility is generally from east to west, so the shallowest depth to groundwater is typically measured in , a well GW-1 or well GW-2 (from 0.41 to 9.28 feet bgs) and the deepest is typically measured in well GW-6 (0.71 to 4.65 feet bgs). The highest groundwater levels are typically measured in January or February, although in 2006 the highest level was measured in June. , The groundwater elevations presented in the monitoring reports are measured relative to ' Condor Control Point No. 1. The survey report included in Condor (2002) indicates this control �2 Page 6 Monitoring Well Installation Work Plan Sutter Home Winery, Lodi,California g%groupW inyoblON865gg5.04 s erho:neOR-report inMg wk pinY Ort