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Kennedy/Jenks Consultants The three production wells (PW-1, PW-3, and PW-4) are located on the south, east, and north ends of the Facility(Figure 2). They are used for the processes associated with wine fining, stabilization, and storage, including general wash down, sanitation, clean up, and tank rinsing. According to the San Joaquin County Environmental Health Department, these wells were most likely installed in the 1960s (SJRGA, 1999). Recent sampling results for production wells PW-3 and PW-4 are summarized in Table 1. Boring logs and well construction details for the production wells were not available. The fire-fighting well (FW-2) is located on the west side of the Facility (Figure 2). A summary of typical laboratory analytical results from groundwater sampling of the well for various volatile organic compounds is provided in Table 2. A boring log and well construction details were not available. Two domestic water wells (A and B) located on the southeast side of the Facility (Figure 2) provide potable water for sanitation and consumption by Facility personnel. The wells were drilled in October and November 2000, respectively, and completed to depths of approximately 300 feet bgs. The wells are 8-inch-diameter, and have steel casing and a 0.060-inch slotted screen. Well A has a 20-foot screened interval, and Well B has 40-foot screened interval. A summary of available analytical data from groundwater sampling for pH, nitrate, nitrite, various volatile organic compounds, metals, and general minerals is provided in Table 3. 1.8 Onsite Groundwater Since 2000, seven onsite groundwater monitoring wells have been installed to investigate groundwater at the Facility. Groundwater monitoring wells MWA through MW-5 were installed at the Site in 2000, and groundwater monitoring wells MW-6 and MW-7 were installed at the Site in 2003. All of the groundwater monitoring wells are 4-inch-diameter, and were constructed of Schedule 40 polyvinyl chloride (PVC) pipe. Wells MW-1 through MW-5 were each constructed with approximately 30 feet of 0.020-inch slotted screen, since the magnitude of groundwater elevation fluctuations was unknown However, since quarterly monitoring data from MW-1 through MW-5 indicated that groundwater elevations fluctuated by approximately 5 feet annually, MW-6 and MW-7, installed in 2003, each have approximately 15 feet of 0.01-inch slotted screen. Monitoring wells MW-1, MW-2, and MW-5 were completed to approximately 77 feet below ground surface (bgs); wells MW-3 and MW-4 were completed to approximately 79 feet bgs; and wells MW-6 and MW-7 were completed to approximately 70 feet bgs. Copies of the well completion logs for wells MW-1 through MW-5 were provided in the RWD (Kennedy/Jenks, 2002) and for wells MW-6 and MW-7 were provided in the Vadose Zone Lysimeter and Groundwater Monitoring Well Installation Report(Kennedy/Jenks, 2003d). Groundwater monitoring wells MW-1 through MW-5 have been sampled quarterly since 2001, and wells MW-6 and MW-7 were added to this quarterly sampling protocol starting in February 2004. The locations of these two wells are considered cross-gradient relative to groundwater flow (Figures 3 and 4). Monitoring activities include measurement of groundwater elevations on a quarterly basis and the collection of groundwater samples for laboratory analysis on a quarterly and annual basis, depending on the parameter. Groundwater monitoring field activities and laboratory analytical services are provided by The Twining Laboratory(Twining). Groundwater Investigation Work Plan Page 10 Barrel Ten Quarter Circle Winery, Escalon, California g:ys-groupladminyob1031030118.08_barrelten103reportslgw invest wrk phtextdoc