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sealed, capped, labeled, placed in an ice chest at 4'C and kept refrigerated until the degree of <br /> saturation is determined. <br /> Following the completion of drilling and sampling operations, each borehole will be <br /> completely filled to existing grade with a 5% bentonite/cement grout slurry using pressure <br /> grouting equipment aYd techniques. <br /> GROUNDWATER QUALITY MONITORING WELL COMPLETION <br /> When the desired borehole depth is reached, blank casing, screen, filter pack, and bentonite <br /> seal will be installed in the hollow-stem auger string. After installation of construction <br /> materials, the hollow-stem auger string will be removed, leaving the completed groundwater <br /> quality monitoring well installation in the borehole. A bentonite/cement grout slurry will <br /> then be tremied into place to ground surface. <br /> All monitoring well screen/casing strings will be thoroughly steam cleaned prior to insertion <br /> in the borehole. All construction materials (filter pack, bentonite and cement) will be <br /> stockpiled away from drilling and sampling activities on polyethylene sheeting and covered to <br /> prevent contamination. The groundwater quality monitoring well will be completed utilizing <br /> rigid NSF-approved PVC casing and screen. <br /> Materials to be used for constructing the groundwater quality monitoring well will include <br /> 2-inch diameter interior/exterior flush threaded NSF-approved rigid PVC Schedule 40 well <br /> casing and well screen. Well screen perforations will be precision machine slotted. Screen <br /> slot sizes will be 0.020 inch to maximize development of the monitoring well, expedite purging <br /> of the monitoring well prior to sampling, and lower groundwater entrance velocities thereby <br /> minimizing volatilization and not biasing the representativeness of groundwater quality <br /> samples collected from the groundwater quality monitoring well. A 1-foot well screen will be <br /> ngb"l(m*2-2) Page 3 <br />