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0 0 Kennedy/Jenks Consultants 4.7.3 Continuous Water Level Monitoring and Stream Gauge Measurements In addition to proposed CPT/ HydropunchT"' methods, onsite activities will include continuous monitoring of groundwater levels in monitoring wells MW-2, MW-3, and MW-4. Water levels will be logged using electronic data loggers for two weeks. Water levels in these and in well MW-5 will then continue to be monitored on a monthly basis for ten months. Stream gauge data for the Mokelumne River that is closest to the site may be used to correlate groundwater levels collected in the above wells. If stream gauge data are not available within an acceptable proximity to the site, Kennedy/Jenks may recommend the temporary construction of a river stage staff (rod) beneath the nearby railroad trestle to manually collect monthly river stage data. The rod would most likely be located beneath the railroad trestle crossing the Mokelumne River just over the Facility s eastern property line. The reason for this effort is to asses the relationship between a likely discharging river and surrounding groundwater. A Darcy flux model will be constructed to quantify the seasonally variable mixing of river water and regionally sourced groundwater by percent volume. 4.8 Groundwater Characterization Report A groundwater characterization report will be submitted to the CRWQCB on 1 May 2006. The report is intended to summarize regular groundwater monitoring data and those collected as part of the GWC Work Plan outline above. The majority of the interpretation will focus on the pattern of groundwater flow beneath the site and its relevance to site activities. As important,the report will identify possible offsite and past practices that may be or have contributed to the current water quality. 4.9 Groundwater Characterization Work Plan Schedule The work outlined in the GWC Work Plan will be implemented according to the following schedule: • 1 November 2004—Submit Groundwater Characterization Work Plan • 30 December 2004— Initiate offsite data collection efforts • 31 January 2004— Install river stage staff(if needed) • 1 May 2005 —Complete CPT/HydropunchTm work • 1 May 2006—Submit Groundwater Characterization Report to CRWQCB Groundwater Protection Work Plan, Woodbridge Winery Page 48 Robert Mondavi, Acampo, California q'a>9rcp'atlrua`;c6'A3�9JG72i00_n„de;�94roiu`.w:li�la:.on+rtV:,la's�coc