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KennedyJenks Consultants Section 3: Proposed Groundwater Monitoring Well Locations and Rationale The primary objective of the proposed groundwater monitoring wells is to characterize ambient groundwater underlying the proposed expanded land application areas. Upgradient, infield, and downgradient monitoring wells are proposed to monitor groundwater quality. The proposed locations are shown on Figure 4. 3.1 Purpose of Monitoring Wells The proposed groundwater monitoring wells will allow Sutter Home to characterize and monitor groundwater underlying the proposed expanded land application areas. There are two principal reasons for characterizing groundwater conditions: • First, ambient groundwater conditions have not been fully characterized beneath the proposed additional land application areas. Although reconnaissance groundwater samples were collected in September 2008 for laboratory analysis, the samples were not collected from properly installed and developed monitoring wells with well screens selected for the site-specific soil conditions. Moreover, the reconnaissance samples were collected during a single event, and monitoring wells will allow characterization of temporal variations. • Second, the proposed monitoring wells will allow Sutter Home to monitor potential impacts (if any) to groundwater as the land application system is expanded into the northern portions of the facility. The series of monitoring wells proposed in this Work Plan will serve both purposes identified above. 3.2 Proposed Locations Seven new groundwater monitoring wells are proposed for installation under this Work Plan. These new monitoring wells, together with the existing monitoring wells, will allow Sutter Home to characterize ambient groundwater conditions and monitor groundwater as the expanded land application system is brought into service. 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-7 Monitor groundwater quality downgradient of the LAAs GW-8 Monitor groundwater quality on the downgradient side of the new process water ponds GW-9 Monitor groundwater quality mid-field,to provide adequate coverage of groundwater quality over the LAA. GW-10 Monitor groundwater quality on the upgradient side of the new process water ponds GW-11 Monitor groundwater quality mid-field,to provide adequate coverage of groundwater quality over the LAA. GW-12 Monitor groundwater quality mid-field,to provide adequate coverage of groundwater quality over the LAA. GW-13 Monitor groundwater quality on the upgradient side of the LAA. The well installation process is described in Section 4. Monitoring Well Installation Work Plan Page 9 Sutter Home Winery, Lodi, California g.` Wup�n4obM%0866085043u rhwnCAB+ep� instAI w!plNextMc