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STANDARD OPERATING PROCEDURE FOR �11 MONITORING WELL DEVELOPMENT ,L - PURPOSE The purpose of this standard operating procedure is to delineate protocols for monitoring well development. FIELD SUPPLIES • Well Development Form • Boring Log and Well Completion Diagram for the well. • Containers for purified water, as required • Decontaminated submersible pump or bailer of appropriate capacity, and surge block sized to fit well • Conductivity,pH, temperature and turbidity meters w • Electric well sounder and measuring tape PROCEDURE • Well development is the process by which drilling fluids, solids, and other mobile particulates within the vicinity of the newly installed monitoring well have been removed r to restore the aquifer hydraulic conductivity. Development corrects damage to or clogging of the aquifer caused by drilling, increases the porosity of the aquifer in the (' vicinity of the well, and stabilizes the formation and filter pack sands around the well screen. • Well development will be initiated after 48 consecutive hours but no longer than 7 calendar days following grouting and or placement of surface protection. • Multiple well development techniques, bailing, over pumping, and surging, will be employed in tandem. Over pumping is simply pumping the well at a rate higher than recharge. Surging a method of forcing water to flow into and out of the screen by r operating of a plunger up and down within the well casing, similar to a piston in a cylinder. rr • Pump or bail the well to ensure that water flows into it,-and to remove some of the fine L� materials from the well. Removal of a minimum of one well volume is initially recommended. The rate of removal should be high enough to stress the well by lowering the water level to approximately one-half its original level, if well recharge allows. i Page 1 of 3 . well_dev_SOP MONITORING WELL DEVELOPMENT February 2005