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Kennedy/Jenks Consultants 4.7.1 Sampling of Onsite Production and Irrigation Wells Kennedy/Jenks will inventory and assess the conditions, water levels, and analytical samples of available irrigation wells and the four production wells. The number of irrigation wells onsite and in the vicinity of the site is unknown at this time. If useful information is retrieved from the irrigation well and production well assessment, those results will be used to assess the number of groundwater probes as described in the following section that may be needed to fill spatial data gaps that prevent the adequate understanding of groundwater conditions beneath the site. Any proposed sampling of the irrigation or production wells will coincide with a regularly scheduled groundwater monitoring event as specified in MRP No. 87-184. 4.7.2 CPT and HydropunchT" The next step will be to install temporary soil and groundwater probes to fill in apparent data gaps that may be realized after the initial sampling efforts described above are completed. Focus will be on two primary onsite areas: 1. Three to five conepenetrometer(CPT)/ HydropunchTM probes will be installed in the area between wells MW-4 and MW-5. This area based on time concentration plots and groundwater contours represents a mixing zone of river water and upgradient sourced groundwater—such as groundwater moving onsite from south of the river and from southeast offsite and cross-gradient areas. CPT data can enhance the understanding of groundwater gradie t and the gradational changes in water quality. Proposed locations of the three CPT and HydropunchTm probes are depicted as CPT 01 to CPT 03 in Figure 2. Initially three locations will be probed and analytical results will be analyzed to determine if two more probes are required in this area. An initial depth of 75 feet bgs is recommended for CPT probes intended to encounter both perched groundwater and the first water bearing zone (aquifer)that is encountered in monitoring wells. 2. Six to 12 conepenetrometer(CPT)/ HydropunchTA1 probes will be installed in the area between wells MW-5, MW-6, and MW-7 to characterize groundwater gradient and water quality in areas that are not irrigated with treated process water. These probes can also shed light on potential migration of constituents, if any,from Block A, E, F, and the East Block vineyards. Proposed locations of the six CPT and HydropunchT"" probes are depicted as CPT 04 to CPT 08 in Figure 2. An initial depth of 85 feet bgs is recommended for CPT probes intended to encounter both perched groundwater and the first water bearing zone (aquifer)that is encountered in monitoring wells. Groundwater Protection Work Plan, Woodbridge Winery Page 4-7 Robert Mondavi,Acampo, California 9 v oG.'�.'tlmpN 1 a r-tkz Aerep-r yu.�i ;1"�aca