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quality monitoring well installation in the borehole. A bentonite/cement grout slurry will <br /> then be pumped into place to ground surface. <br /> All morutonng wellE 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 /> i <br /> stockpiled away from dnlhng and sampling activities on polyethylene sheeting and covered to <br /> prevent contamination All groundwater quality monitoring wells will be completed utilizing <br /> rigidPP NSF-a roved PVC casing and screen <br /> i <br /> Materials to be used for constructing the groundwater quality monitoring wells will include <br /> 2-inch diameter nntenor/exterior flush threaded NSF-approved rigid PVC Schedule 40 well <br /> i <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 /> • m nuT zing volatilization and not biasing the representativeness of groundwater quality <br /> samples collected from the groundwater quality monitoring wells. A 10-foot well screen will <br /> be installed to each groundwater quality monitoring well from a depth of 5 feet above to 5 feet <br /> below the existing groundwater surface This will adequately compensate for any annual <br /> fluctuations in the local groundwater surface, thereby allowing accurate determination of <br /> groundwater elevations at any time of the year, and providing representative groundwater <br /> samples for determination of hydrocarbon constituents with specific gravities less or greater <br /> than water All screen/casing strings will be threaded together The use of solvent glues will <br /> not be used to assemble the screen/casing strings Filter pack material will be clean, rounded, <br /> water-worn material, and will be installed in the annular space adjacent to the well screen to a <br /> distance of 2 feet above the top of the well screen section Within the annular space above <br /> the filter pack material, a nummum 2-foot thick hydrated bentonite pellet seal will be placed <br /> The remaining portion of the annular space will be sealed with a 507o bentonite/cement slurry <br /> r to ground surface To protect the monitoring wells from accidental damage or tampering, a <br /> Page 21 <br /> I <br />