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Kennedy/Jenks Consultants chemical concentrations in nearby wells (GW-3 and GW-4). The ditch along the northern property boundary historically collected irrigation return flow. Potential impacts of the perimeter canal and ditches at the facility will be evaluated by maintaining logs of the presence and amount of flows in each ditch. During quarterly groundwater monitoring events in winter and spring 2010, water quality samples will be collected from each ditch if water is present. This dataset will be used to assess potential leakage from the irrigation canal and the degree of dewatering of the LAAs by the north drainage ditch. Soil permeability along the ditches will be assessed as part of this investigation, if needed. Additional groundwater monitoring wells along the north property boundary (discussed below) will provide groundwater quality information. 3.2 Proposed Groundwater Monitoring Well Locations and Rationale Additional groundwater monitoring wells are proposed to better understand the variability in groundwater quality at the facility and to characterize background water quality. 3.2.1 Purpose of Monitoring Wells The proposed groundwater monitoring wells will allow Sutter Home to further characterize and monitor groundwater underlying the proposed land application areas. The additional groundwater monitoring will enable Sutter Home to characterize background groundwater quality. Once background conditions are established, potential impacts of the LAAs can also be evaluated. 3.2.2 Proposed Locations Four new groundwater monitoring wells are proposed for installation under this Work Plan. The proposed and existing monitoring well locations are shown on Figure 4. The rationale for each of the proposed monitoring wells is discussed below: Proposed Monitoring Well Rationale GW-15, GW-16, GW-17 These locations along the northern property boundary are hydraulically cross-gradient to the dominant groundwater flow direction in the area. Land use to the north consists of crop production and some manure land application. GW-18 This location at the eastern property boundary is hydraulically upgradient of the dominant groundwater flow direction and downgradient of dairy farming operations to the east. These well locations would augment two existing wells on the eastern property boundary (GW-1 and GW-13) to provide sufficient data to characterize variability in upgradient groundwater quality. The well installation process is described in Section 4. Hydrogeologic Investigation and Groundwater Sampling and Analysis Work Plan, Page 11 Sutter Home Lodi Winery, Lodi, California g:Y3-gro.plaGNn'{oC108108c5005.�wtteilfame109aepoftk"r tas %10yft work PIVnLxtdm