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• • • spray enters the well. The well designation will be painted on the outside of the • protective casing using white paint and a stencil. The identification will be accomplished • after the casing is painted. All painting will be completed and dry prior to well • development. The site will be restored at the completion of the well, with sites graded to original contours. • • D. WELL DEVELOPMENT The monitoring wells will be cleaned and developed to improve the permeability of the zone around the well screen, and to permit the collection of sediment-free groundwater • samples. The development of the monitoring well will be performed as soon as practical • after well installation, but no sooner than 24 consecutive hours after grout seal placement. • The development purging requirement will be ten well casing volumes, with a turbidity goal of 10 NTU and stabilization of pH, electroconductivity(EC), and temperature. • • Well development will be accomplished with a pump and/or a bottom discharge/filling • bailer(for sediment removal) and surge block. Well development will be completed at least four consecutive days before well sampling. Development will proceed in the • manner described below until the well water is clear to the unaided eye and the sediment • thickness remaining within the well is less than 5 percent of the screen length. No • dispersing agents, acids, disinfectants, or other additives will be used during development • or at any other time be introduced to the well. During development, water will be removed throughout the entire water column by periodically lowering and raising the • pump intake (or bailer stopping point). During development and test pumping of the wells, development water will be conveyed away from the well site in such a manner as to minimize erosion and avoid inundation. • Water, including mud, sand, and debris pumped from the well during development and • testing, will be disposed of in such a manner as not to damage or interfere with work or • property of others. • Part of the well development will be the washing of the entire well cap and the interior of • the well casing above the water table using only water from the well. The result of this • operation will be a well casing free of extraneous materials (grout,bentonite, sand, etc.) • inside the riser, well cap, and blank casing between the top of the well casing and the water table. The washing will be conducted before and/or during development. • • The following data will be recorded as part of development: • . Well designation. • • • Date(s) of well installation. • Date(s) and time of well development. • • Static water level from the top of well casing. • • Riverbank WWTP Workplan Nolte Associates,Inc. • March 2005 5 \\SasO\project\SA1542\mon_weMnew\gwmwiwp\wp.doc •