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Kennedy/Jenks Consultants Chapter 4: Groundwater Characterization Work Plan This work plan presents an outline for characterization of groundwater at Woodbridge and was prepared by Kennedy/Jenks in response to Item 1.b of the Order. 4.1 Introduction The objective of Chapter 4, the Groundwater Characterization Work Plan (GWC Work Plan) is to describe a plan to evaluate the quality of groundwater upgradient, beneath, and downgradient of the Facility, and to protect the beneficial uses of groundwater and satisfy the provisions of WDR No. 87-184 (CRWQCB, 1987), and Revised MRP No. 87-184 (CRWQCB, 2001). The GWC Work Plan includes a compilation of the onsite and offsite groundwater data, and a plan for acquiring additional groundwater quality data both onsite and offsite. 4.2 Onsite Groundwater Quality The purpose of this section is to discuss the strategy and methods and source of information for evaluating the groundwater quality beneath the Facility. Onsite groundwater quality data and subsurface stratigraphic information are derived from soil borings, production, irrigation, and monitoring wells that are located at the Facility. The available information is briefly summarized below. 4.2.1 Production and Irrigation Wells At the time of this work plan, there is an unknown number of irrigation wells located at the Facility that are used for vineyard irrigation on an as needed basis.Well construction details for the irrigation wells are also not available at this time. Three production wells are currently used at the Facility as shown in Figure 2. A fourth well, Production Well No. 2, was taken out of service in December 2002. In 2003, the Facility used approximately 240,000 gallons of production well water per day which is used for all needs within the Facility including drinking water, landscape irrigation, wine production processes, and sanitation of equipment, floors, and process areas. Prior to use for some winemaking processes (e.g., bottle rinsing, barrel washing, and lab activities), production well water is softened using Ecowater Systems water softeners. Water used in cellar operations (e.g., equipment rinsing, tank sanitizing, and line chasing) is not softened. Water supply produced from Production Well No. 4 is filtered with Fresno vertical sand media filters prior to use. Woodbridge is in the process of separating the domestic water distribution system from the production water supply distribution system. Production Well No. 1 will be used for domestic water and Production Well No. 4 will be used for production water. Production Well No. 3 is a standby well that is used for emergencies or during power outages. As mentioned above, Production Well No. 2 was taken out of service in December 2002 and is no longer used at the Facility. Groundwater Protection Work Plan, Woodbridge Winery Page 4-1 Robert Mondavi,Acampo, California g6s9r�9a:e N7DJOJ91%3.OQ rniondmW,4mpe'Giguswler8ion�aVrinuaada,