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Jim Crandell - 3 - 15 February 2005 <br /> • Groundwater samples shall be collected from the first saturated interval. Additional samples can <br /> be collected from deeper intervals if desired. If multiple intervals will be sampled, please <br /> describe how mixing of groundwater from different depths will be prevented. <br /> • Please describe what physical parameters will be logged while pushing the CPT. <br /> • Please describe any evidence of a perched groundwater zone. Staff's review of the boring logs <br /> does not indicate a perched zone exists. Even if a perched zone exists, it is considered <br /> groundwater from a regulatory protection perspective. <br /> • Please describe how the CPT holes will be grouted. <br /> Staff believes the wastewater ponds are presently degrading groundwater quality and the 15 March 2004 <br /> Preliminary Groundwater Evaluation Report prepared by Kennedy/Jenks Consultants stated additional <br /> investigation was warranted. The Groundwater Characterization Workplan should focus on collecting <br /> data necessary to determine if groundwater is being degraded. Because the workplan does not describe <br /> an investigation that will resolve the degradation question, it must be revised. <br /> Groundwater Monitoring Well Installation Workplan <br /> Staff did not review the Groundwater Monitoring Well Installation Workplan portion of the report at this <br /> time because no new monitoring wells are proposed. Staff believes that the results of the CPT <br /> investigation will delineate the areas in which additional wells are needed. At that point, Robert <br /> Mondavi Winery shall submit an addendum that identifies proposed well locations and staff will provide <br /> comments at that time. <br /> By 11 March 2005, please submit an addendum to the workplan. If you have any questions on this <br /> conditional approval, please telephone me at(916) 464-4616. <br /> TIMOTH R. O'BRIEN <br /> Waste Discharge to Land Unit <br /> cc: Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Robert Chrobak, Kennedy Jenks Consultants, San Francisco <br /> W 1SI0 nenTan JopuinY.MOMavOCmr ll 9 Feb 05.dov <br />