Laserfiche WebLink
Kennedy/Jenks Consultants <br /> nature of groundwater flow beneath the Facility; and (2) identify environmental factors that could <br /> be influencing groundwater quality at the Facility and vicinity. <br /> Analysis of existing data indicates that the groundwater quality beneath the Facility is influenced <br /> by multiple origins of groundwater with differences in water chemistry. For the purposes of <br /> responding to the CRWQCB's request and more importantly to maintain a focused investigation <br /> of the nature of groundwater beneath the Facility, concurrent onsite and offsite investigation <br /> activities are outlined herein. Available offsite groundwater quality data are crucial in performing <br /> a flow balance to understand the relationship between onsite and offsite groundwater quality. <br /> Onsite findings of groundwater flow and chemistry will be compared regional groundwater <br /> trends (flow gradients and chemical distributions). The planned investigations will continue to <br /> focus on shallow groundwater of depths near the ground surface to about 70 feet bgs <br /> (see Section 1.4.2 and 1.4.3). Perched groundwater at about 10 feet bgs will be investigated. <br /> Groundwater elevation and water quality temporal and spatial trends for any existing and <br /> additional monitoring wells will be analyzed. These analyses are based on time versus water <br /> levels and concentrations plots. In addition, isochron (contour) maps will also be evaluated to <br /> identify spatial dependency or environmental source area(s) influences. <br /> 4.6 Offsite Data Compilation <br /> Available offsite groundwater elevations and groundwater quality data will be compiled to <br /> evaluate potential offsite influences on onsite groundwater. If the available offsite data is <br /> inadequate for evaluating onsite groundwater quality, additional offsite data collection activities <br /> may be recommended. To characterize the regional groundwater and geology, the area of <br /> interest will be delineated in terms of township and range coordinates. The groundwater data <br /> that are from the same shallow groundwater aquifer beneath the Facility will be compiled. <br /> Data such as groundwater elevation, groundwater quality, and well completion logs that are <br /> available from the Department of Water Resources (DWR)will be compiled. Groundwater <br /> elevation data are generally reported in files of data prior to 1990 and another file of data from <br /> 1990 to present. Typically, groundwater quality data includes a list by sample date of <br /> constituents analyzed as well as the units for those measurements. These two data sets <br /> generally are not characterized for the same wells. Well completion logs will also be requested <br /> for all drilled wells in the study area. <br /> Groundwater gradient will be developed in conjunction with onsite data. Contour maps <br /> representing the groundwater table will be constructed to assist in a Darcy flux model of flow <br /> balance between offsite and onsite groundwater and the contribution from the Mokelumne <br /> River. <br /> 4.7 Onsite Activities <br /> No new monitoring wells are proposed at this time to assess groundwater quality beneath the <br /> site. The proposed priority for onsite investigations are outlined below. <br /> Groundwater Protection Work Plan, Woodbridge Winery Page 4-6 <br /> Robert Mondavi, Acampo, California <br /> g4s9rouP�nyeG'Di:C.0�2��A_to4r7av004�Wwri'mn_praavon_wrtylnlW;bicc <br />