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Kennedy/Jenks Consultants washed packaged sand sized accordingly for the well screen slot size selected (Lonestar#2/12 or equivalent for 0.010-inch slots). The filter pack will extend upwards from the bottom of the boring to one to two feet above the screened section. All wells will be pre-developed after the filter pack is installed, and prior to the bentonite seal being installed. A two- to three-foot layer of protective bentonite clay pellets will be placed to minimize downward migration of the grout seal into the filter pack. A cement/bentonite grout will be placed so as to extend continuously from the top of the bentonite pellet layer to ground surface. If the well is constructed in a trafficked area, the well will be completed with a flush, traffic-rated well enclosure will be installed to control access to the well opening. If the well is located in the LAA, the well casing will be extended above ground and a protective steel standpipe will be erected the well casing. A schematic diagram of well construction details is shown on Figure 6. After waiting a minimum of 48 hours to allow curing of the grout and concrete, the monitoring wells will be developed by surging and pumping until the water removed from the wells is sediment-free or until no further improvement in water quality is observed. The wells will be allowed to recover for a minimum of 72 hours following well development, prior to monitoring and sampling. 2.1.1 Surveying The locations and well casing elevations of the new monitoring wells will be horizontally and vertically surveyed by a licensed land surveyor. The ground surface and top of well casing elevation will be surveyed to the nearest 0.01 foot relative to mean sea level. The ground surface and casing will be surveyed to the National Geodetic Vertical Datum (NGVD 1983), relative to nearest benchmark at the Facility. Horizontal locations of the new wells will also be surveyed relative to the California Coordinate system to 0.1 foot. 2.1.2 Residuals Management Residuals generated as a result of these activities are anticipated to include soil cuttings from the drilling activities, decontamination water resulting from the drilling activities and development of the monitoring wells, and purge water from sampling of the monitoring wells. The soil cuttings will be distributed on the ground near each work site. Water residuals will be distributed on the ground or in the LAA at the Facility, in a manner that does not affect work site safety. 2.1.3 Groundwater Sampling An initial sampling of groundwater will be conducted from the two monitoring wells no sooner than 72 hours after the newly installed wells have been developed. Groundwater sampling will be performed in accordance with the SOG for Groundwater Sampling (Appendix 13). Groundwater will be purged from the monitoring wells prior to sampling to acquire samples representative of aquifer conditions. Field parameters pH, temperature, and specific conductance will be monitored during purging to document stabilization. The parameters will be measured in accordance with Kennedy/Jenks' SOG for Field Measurement of pH, Temperature, and Specific Conductance (Appendix C). Purge water will be distributed on the ground or in the LAA at the Facility. Groundwater Investigation Work Plan Page 16 Barrel Ten Quarter Circle Winery, Escalon, California 9:6s-groupladminl ob1031030l l8.08 barrelten109-reportslgw invest wrk pinllext doc