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K � Kennedy Jenks 5. Place a 2- to 3-foot thick (or more) bentonite pellet or chip seal above the sand pack, as the auger and/or casing is removed from the boring. If the seal is placed above the water table, the bentonite pellets must be hydrated with potable water prior to placement of the annular seal. 6. Fill the remainder of the annulus between the well casing and the borehole wall with cement/bentonite grout (with approximately 5 percent bentonite), or neat cement, to a depth of approximately 1 foot below ground surface. If the water level is higher than the seal, or the casing is installed in an open borehole, use a tremie pipe to place the grout. 7. Install either a threaded cap or a locking watertight expansion plug on the monitoring well. Place a steel hasp-locking well housing over the top of the well and cement it into the annulus of the boring. 8. Place a traffic-rated precast concrete or steel well enclosure approximately 1 to 2 inches above grade in non-paved areas and slightly above grade in paved areas, and cement it into place with concrete. Have a concrete apron constructed around the well housing enclosure to facilitate runoff. Use a bubble level to ensure the lid is flat. 9. For aboveground completion, ensure that the well casing extends approximately 3 feet above ground surface. An 8-inch diameter hasp-locking steel well housing surrounds the well casing. Traffic bollards can be installed around the well housing, as necessary. 10. Repeat Steps 1 through 9 for all monitoring wells at site. 11. Following the curing of the grout (approximately 24 hours), each monitoring well is developed. Prior to development activities, measure the depth in each well to static water level and total casing depth. 12. During development of each well, ensure that field parameters and observations are recorded on a purge and sample form. Information to be recorded includes, but is not limited to, the following items: Beginning depth to water Development time and volume Development (flow) rate pH, temperature, specific conductivity, and turbidity Other observations, as appropriate (e.g., color, presence of odors, or sheen) Total volume of water removed by method, and the pumping rate. Ending depth to water 13. Follow the basic steps: A. Remove standing sediment from the bottom, with a bailer or suction pump. Sediment may clog or ruin a submersible pump. Monitoring Well Installation Work Plan, D-2 The Wine Group, Franzia Winery, Ripon, CA P.\1 S-Proj\2003-post archive\030120.XY_GW Mon Well Support\09-Reports\piecesWPP_D SOG Well_Const.doc