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qb <br /> STANDARD OPERATING PROCEDURE FOR <br /> MONITORING WELL DEVELOPMENT <br /> PURPOSE <br /> The purpose of this standard operating procedure is to delineate protocols for monitoring well <br /> development. <br /> FIELD SUPPLIES <br /> • Well Development Form <br /> • Boring Log and Well Completion Diagram for the well <br /> • Containers for purified water, as required <br /> • Decontaminated submersible pump or bailer of appropriate capacity,and surge block <br /> sized to fit well <br /> • Conductivity,pH,temperature and turbidity meters <br /> • Electric well sounder and measuring tape <br /> PROCEDURE <br /> • Well development is the process by which drilling fluids,solids,and other mobile <br /> particulates within the vicinity of the newly installed monitoring well have been removed <br /> to restore the aquifer hydraulic conductivity. Development corrects damage to or <br /> clogging of.the aquifer caused by drilling,increases the porosity of the aquifer in the <br /> vicinity of he well, and stabilizes the formation and filter pack sands around the well <br /> screen. <br /> • Well development will be initiated after 48 consecutive hours but no longer than 7 <br /> calendar days following grouting and or placement of surface protection. <br /> • Multiple well development techniques,bailing, over pumping, and surging,will be" <br /> employed in tandem. Over pumping is simply pumping the well at a rate higher than <br /> recharge. Surging a method of forcing water to flow into and out of the screen by <br /> operating of a plunger up and down within the well casing, similar to a piston in a <br /> cylinder. <br /> • Pump or bail the well to ensure that water flows into it, and to remove some of the fine <br /> materials from the well. Removal of a minimum of one well volume is initially <br /> recommended. The rate of removal should be high enough to stress the well by lowering <br /> the water level to approximately one-half its original level,if well recharge allows. <br /> Page 1 of 3 <br /> well_dev_SOP MONITORING WELL DEVELOPMENT February 2005 <br />