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' §eofogtc dTechnus inc Page 4 J M Equipment Co Monitoring Well Installation Work Plan ' Appendix A Project No 507 2 January 13,1997 1 ' center of the hollow stem augers and then the augers will be withdrawn from the hole The borehole annulus will be closed by pumping a neat cement grout(<4%bentonite/cement)through the tremie tube up to grade 29 Monitoring Well Construction The monitoring wells will be constructed with 4 0 inch diameter, schedule 40 PVC casing with flush threaded Joints A screened interval will consist of 0 020 inch perforations extending from approximately 15 feet below and 5 feet above the water table ' A number three sand will be used to form a filter pack about the saturated zone (0 020") perforations and will extend two feet above this screened interval An annular seal will be constructed by mstallmg 100 pounds of granular bentonite that will be hydrated with tap water and be allowed to expand for a period of one hour In ' the remaining annulus, neat cement grout will be installed using a slurry pump and tremae pipe The well will be secured with a water tight locking cap encased within a traffic safe well box A well construction schematic is attached as Figure 3 Relative well collar elevations may be surveyed by a competent surveyor 2 10 Monitoring Well Development Within 48 hours of well installation after well sealing materials have had time to set, each monitoring well will be developed by mechanical surging and pumping unto a clear stream is obtained All down hole equipment will be decontaminated before and between uses Development water will be removed from the well using either a bailer or a submersible pump and contamerized in D O T approved drums (labeled contents under analysis) to await proper disposition After development the wells will be allowed to stabilize before they are purged and sampled •