WORK PLANS - Laserfiche WebLink

Home Browse Search

Schedule 40 steel posts will be installed around the monitoring well pad to prevent damage to the well by vehicular operation. The posts will be installed a minimum of 2% feet into the ground and extend approximately 3%: feet above ground surface. The posts will be anchored in concrete and painted fluorescent yellow or orange. The outside of the protective casing, hinges, and cover/cap will also be painted fluorescent yellow or orange. Extra care will be taken to ensure that no paint or aerosol spray enters the well. The well designation will be painted on the outside of the protective casing using black 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. 4.0 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 representative groundwater samples. The development of the monitoring well will be performed as soon as practical after well installation, but no sooner than 48 consecutive hours after grout seal placement. 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 two 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. The turbidity goal is 10 NTUs. 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). Compressed air may be used for development. 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. French Camp-Monitoring Well Installation Workplan 5 SAB027100 September 2006 C9Documents and Senings\mlagorlo\Local Settings\Temporary Internet Files\OLK9F\Work Plan