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Kennedy,'Jenks_ Consultants point is at elevation 14.48 but does not provide the datum. Subsequent Condor monitoring reports state that groundwater elevations are referenced to a 'relative datum", probably meaning Condor Control Point No. 1. The groundwater gradient magnitude based on the elevations referenced to the relative datum is typically around 0.0005 feet per foot. The small gradient magnitude is a function of the proximity to the Delta and the flat local topography. 2.2.7.2 Facility Groundwater Quality Condor has monitored the groundwater quality at the facility on behalf of Sutter Home since 2002. The analytical results from the reconnaissance groundwater samples collected from the two northern parcels in September 2008 are summarized in Table 4. The TDS and nitrate data from the onsite monitoring wells and the reconnaissance groundwater samples collected from the two northern parcels indicates some variability which is difficult to attribute to specific activities. For example, although TDS concentrations in groundwater wells at the western, downgradient edge of the facility (wells GW-5 and GW-6) are typically higher than those in wells installed along the southern perimeter of the facility (wells GW-1, GW-3 and GW-4), the TDS concentrations in wells GW-5 and GW-6 are similar to those observed in the reconnaissance groundwater samples. These TDS concentrations are also consistent with those measured in wells throughout the region. 2.3 Water Supply Source water for the facility is supplied by a groundwater supply well located at the eastern side of the facility (see Figure 2). The supply well provides water for both domestic and process uses. A well log for the supply well was not available but the well was reportedly drilled to 225 feet bgs, installed with 16-inch diameter casing and 30 feet of screen at the bottom of the well. Data collected from the supply well are summarized in Table 5. Water quality samples have been collected at both the wellhead and at various locations within the distribution system. Based on the data collected, the average TDS of the supply water is approximately 230 milligrams per liter (mg/1). Nitrate as nitrogen values are typically less than 1 mg/l. 2.4 Surrounding Land Uses Neighboring properties were reviewed by conducting a survey of aerial photographs and conducting a drive-by visual inspection during site visits to the facility. Local land use consists of vineyards, agricultural operations, and confined animal facilities. Topography of the surrounding area is generally level. Irrigation ditches along the southern edge of the facility transport Woodbridge Irrigation District water to local farmers. The onsite irrigation ditches are not connected to nearby surface water. Regional surface drainage is to the Mokelumne River and the facility is located within the Lower Mokelumne Hydrologic Area (No. 531.20). The beneficial uses of the Mokelumne River include agricultural irrigation and stock watering, contact recreation, canoeing and rafting recreation, other non-contact Monitoring Well Installation Work Plan Page 7 Sutter Home Winery, Lodi, California g:gs-groupteE njobWB096500604_subftmel09 repels installw NnYextAc