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Groundwater Monitoring Well Installation <br /> Section 2 <br /> 2.6 WELL DEVELOPMENT <br /> The drilling contractor will develop the wells using a combination of methods. Where <br /> practicable and where formations stability permits,well development by gently swabbing the <br /> well with a surge block will be initiated before the installation of the bentonite transitional seal or <br /> neat cement/cement grout sanitary seal to ensure settling of the filter pack prior to sealing the <br /> annulus. Once the seal has been installed and sets up for no less than 12 hours, further <br /> development by vigorously swabbing the wells with a surge block and manual bailing will ensue <br /> and continue until the concentration of suspended solids in the water baild from the wells are <br /> sufficiently low to permit pumping with a portable submersible pump. Ac mulated fill shall be <br /> removed from the bottom of the well screens. <br /> Development will continue until the discharge water runs clear and/or field measured turbidity is <br /> 5 n.t.u., or less. During the pumping phase of well development, the pump will be moved up and <br /> down the entire length of well screen, maximizing the removal of accumulated fines. <br /> Water generated from the wells during development will be discharged directly to land. <br /> 2.7 WELL DISINFECTION <br /> It has been ECO:LOGIC's experience that the effectiveness of well disinfection procedures vary. <br /> As such,the proposed monitoring wells will not be disinfected unless monitoring results indicate <br /> persistently elevated densities of coliform organisms over several consecutive quarters of <br /> groundwater monitoring. Should coliform fail to decline over time well disinfection maybe <br /> conducted in accordance with ANSI/AWWA Standard C654-03, Disinfection of Wells (2003). <br /> April 2008 Woodbridge Sanitary District <br /> WBSD07-002 2S Groundwater Monitoring Well Installation Workplan <br />