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Kennedy/Jenks Consultants September 2008 are also summarized in Table 3. Annual monitoring has been performed since 2002 for the domestic wastewater system monitoring wells (DWS-1 through DWS-3), and these monitoring data are provided in Table 4. Constituent concentration contour maps for TDS and nitrate-N (August 2009) are provided on Figures 8 and 9, respectively. These concentration contours represent chemical data collected on 26 August 2009 (GW-1 through GW-7) and 18 August 2009 (GW-8 through GW-14). The TDS and nitrate-N data from the onsite monitoring wells and the reconnaissance groundwater samples collected from the two northern parcels indicate some variability that is difficult to attribute to specific activities. TDS. TDS concentrations in groundwater wells at the western, downgradient edge of the facility (wells GW-5 and GW-6) and at the northern, cross-gradient edge of the facility (GW-9, GWA 1, GWA 3, and GWA 4) 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 at monitoring wells along the western and northern edges of the facility are also consistent with those measured in wells throughout the region. Nitrate. Nitrate concentrations in groundwater wells at the northern, cross-gradient edge of the facility (GW-9, GWA 1, GW-12, and GWA 3) and downgradient of the historic process water ponds (GW-7) are typically higher than those in wells installed along the southern perimeter of the facility (wells GW-1, GW-3 and GW-4) and western perimeter of the facility (GW-5 and GW-6). Groundwater quality trends are depicted on Figures 10 through 12. The current estimates of background TDS and nitrate concentrations for the facility were calculated using the 95% upper confidence limit (UCL) of the mean (USEPA 2009). The data used for the concentrations shown below were collected in August 2009 from GWA through GW-4 and GW-8 through GW-14. Wells GW-5, GW-6, and GW-7 were excluded from the background analysis, because these wells are adjacent to the existing 15.5-acre LAA. In this dataset, nitrate-N is used to represent total nitrogen, as concentrations of total Kjeldahl nitrogen were all below analytical reporting limits. Chemical 95 Percent Upper Confidence Limit Concentration TDS mg/I 665.5 _ Total Nitrogen (NO3-N), mg/I 20.5 In the future, after LAA acreage has increased, background concentrations will be approximated by calculating the 95% UCL on the six perimeter wells: GW-1, GW-13, and the four new wells described in Section 3.2.2. Background concentrations will be updated annually to incorporate new data. Hydrogeologic Investigation and Groundwater Sampling and Analysis Work Plan, Page 7 Sutter Home Lodi Winery, Lodi, California gV$-9rou0ddmnWbM&086500506svt bome109-repom*dr le SUbhyko work plan,MxLda