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A 2-foot bentonite seal will be placed above the send pack by slowly dropping bentonite <br /> pellets through a tremie pipe to the top of the filter pack. The pellets will be hydrated by <br /> adding clean water if water is not present in the annulus. <br /> A cement bentonite grout mixture will be placed to seal the annulus up to the ground <br /> surface. The grout mixture will contain five percent bentonite to cement and will be mixed <br /> thoroughly be recirculation through a pump. Tne mixture will then be tremied into the <br /> annulus between the casing and the borehole wall. <br /> The wells will be completed above grade and enclosed inside a locking monument box. A <br /> gram is included as Attachment 1, Monitoring Well <br /> typical monitoring weil completion dia <br /> Design. <br /> Approximately 24 hours after installation, each monitoring well will be developed by <br /> of the well with a surge block in a plunger-like fashion and then <br /> swabbing the inside <br /> 3 pumping with a submersible pump until the discharge water clears. This procedure is <br /> repeated twice. Surging will also take place during the pumping phase of development y <br /> turning off the submersible pump (with its check valve removed) intermittently during <br /> pumping. <br /> The well will be swabbed 30 times at a slow speed over the entire length of the well screen <br /> ng of the well until the pump discharge water clears. This step will then <br /> followed by pumpi <br /> increased. Following clearing of the discharge water <br /> be repeated with the swabbing speed <br /> ` from the final pumping, the well will be pumped at the submersible pump's maximum <br /> pumping rate (approximately 20 gallons per minute) for one hour. <br /> After installation and development of the monitoring wells, the areal location of the well <br /> duce an accurate <br /> will be surveyed to proplot plan. The casing elevations of the monitoring <br /> to obtain accurate groundwater elevations. A total <br /> well will also be surveyed in order <br /> station surveying unit will be used to obtain the angle, distance, and elevation <br /> measurements. <br /> Page 2 <br /> j)1 IlbecL3Q) <br /> 1 <br />