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Kennedy/Jenks Consultants <br /> 3.4 Groundwater Monitoring Well Installation and Well <br /> Development <br /> After LAA construction is completed, replacement wells GW-5R and GW-6R will be installed on <br /> the north-south trending roadway located on the west side of the new LAA. The well locations <br /> are shown on Figure 3. <br /> Kennedy/Jenks will oversee the licensed drilling subcontractor during drilling of the subsurface <br /> borings for the proposed monitoring wells at the site. The boring for each well will be drilled <br /> using a hollow-stem auger drilling rig. Soil will be continuously cored using a CME or equivalent <br /> system, or continuously cored using a drive sampler. The soils will be logged under the <br /> supervision of a California Professional Geologist. Based on a review of available data, the <br /> anticipated boring depth is no more than 20 feet bgs. Both monitoring wells will be completed <br /> with 10-foot long well screens. <br /> 3.4.1 Well Construction <br /> The boreholes will be converted into completed groundwater monitoring wells in accordance <br /> with Kennedy/Jenks' Standard Operating Guideline (SOG)for Well Construction and <br /> Development(Appendix B). The boreholes will be 8 inches in diameter and the monitoring wells <br /> will be constructed of 2-inch diameter Schedule 40 polyvinyl chloride (PVC)casing. The <br /> screened interval will consist of 10 feet of 0.010-inch slotted casing, or other slot size <br /> appropriate for the lithologies encountered based on the lithologic logs from the soil borings, <br /> with a threaded end cap. Above the screened section, each well will consist of flush-threaded, <br /> 2-inch diameter, Schedule 40 PVC blank casing. A continuous filter pack will be placed in the <br /> annular space between the screened section and the wall of the boring. The filter pack will <br /> consist of washed packaged sand sized accordingly for the well screen slot size selected <br /> (Lonestar#2/12 or equivalent for 0.010-inch slots). The filter pack will extend upwards from the <br /> bottom of the boring to one to two feet above the screened section. The wells will be <br /> pre-developed after the filter pack is installed, and prior to the bentonite seal being installed. A <br /> two-to three-foot layer of protective bentonite clay pellets will be placed to minimize downward <br /> migration of the grout seal into the filter pack. A neat cement grout will be placed above the <br /> bentonite extending continuously from the top of the bentonite pellet layer to less than one foot <br /> below grade. Based on the construction of existing wells, it is anticipated that this grout seal will <br /> be extended to an approximate depth of three to four feet bgs. <br /> A locking expansion cap and well-housing enclosure will be installed to control access to the <br /> well opening. Wells located in unpaved areas off of the access roads will be completed above <br /> grade and furnished with a protective, locking steel casing. Wells located in access roads will be <br /> completed with a traffic-rated surface monument. Each surface monument will be completed <br /> one to two inches above grade and furnished with a sloping concrete apron to facilitate surface <br /> drainage away from the well. A schematic diagram of well construction details is shown on <br /> Figure 4. <br /> Sampling equipment will be steam cleaned between boreholes. The augers will not be steam <br /> cleaned between boreholes. <br /> Monitoring Well Replacement Work Plan Page 5 <br /> Sutter Home Winery, Lodi, California <br /> g mupkWminyoDlOB`A985005.15_v rhomeM0 epat wln4a9w txtdm <br />