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Kennedy/Jenks Consultants 3.2.2 Existing Groundwater Monitoring Wells The Wine Group has constructed three (3)groundwater monitoring wells to monitor groundwater beneath the Facility. The locations of monitoring wells MW-1, MW-2, and MW-3 are depicted in Figure 2. Based on calculated gradients in Table 4, MW-1 and MW-3 are considered to be hydraulically downgradient of the process water land application areas and upgradient of sanitary wastewater septic tank and leach field systems. MW-2 may be considered to be located hydraulically upgradient of the process water land application areas, although MW-2 is slightly offset to the west and may not accurately represent background water quality directly upgradient of the land application areas. Construction details for the existing wells are presented in Table 3, and copies of the well construction logs for the three monitoring wells are provided in Appendix A. The total depths of these wells range from 56 feet bgs (MW-3)to 80 feet bgs (MW-1 and MW-2), and the wells are screened at depths of 35.5 to 55.5 feet bgs (MW-3) and 50 to 80 feet bgs (MW-1 and MW-2). 3.2.2.1 Groundwater Analyses The current WDR, issued in April 1995 and the revised MRP issued in April 2001, require monitoring of the groundwater beneath the Facility. Current monitoring activities include measuring groundwater elevations on a quarterly basis and collecting samples for laboratory analysis on a quarterly and annual basis, depending on the parameter, from the three existing groundwater monitoring wells. Table 7 summarizes available analytical results for the time period of November 1995 through April 2003. According to the CAO, the groundwater monitoring data may suggest that concentrations of dissolved solids in groundwater samples collected from monitoring wells MW-1 and MW-3 (downgradient of the LAAs) are elevated relative to the concentrations in groundwater samples collected from MW-2 (the upgradient well). According to the CAO, the average electric conductivity, total dissolved solids, fixed dissolved solids, sodium, magnesium, chloride, and sulfate concentrations in the downgradient wells are higher than in the upgradient well. The CAO also indicated that MW-1 has had a higher nitrate concentration than the other monitoring wells sampled at the Facility. 3.2.3 Proposed Groundwater Monitoring 3.2.3.1 Locations of Proposed Wells The Wine Group proposes two monitoring well locations to characterize the groundwater upgradient, beneath, and downgradient of the Facility. These monitoring well locations are identified as monitoring wells MW-4 and MW-5, and are shown in Figure 14. These proposed locations were selected based on accessibility, probable location of potential sources that may impact groundwater beneath the Facility, soil type and subsurface stratigraphy, probable location of known subsurface utilities, and spacing between wells to allow for more accurate estimation of the groundwater gradient(see Section 2.6.1). Groundwater Protection Work Plan, The Wine Group Page 3-2 Franzia Winery, Ripon, California gtisF'nW`Mmi;yolY3AJ1340I wineq�vup;53reoaLSUro�atinmsA:ac