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• DDIAcy OU 1 Pesticide Reme diation Groundwater Extraction Well Installation Work Plan Table 3-1. Estimated Well Specificationsa Estimated Estimated Casing Estimated Length of Boring Depth Diameter Casing Well Slot Well Screen ID (feet bgs) (inches Material Screen Material Size fee PEW-1 40 6 SCH 40 PVC #304 wire-wrapped 0.020 20 stainless steel PEW-2 40 6 SCH 40 PVC #304 wire-wrapped 0.020 20 stainless steel Well specifications are dependent on the lithology encountered during drilling. bgs = below ground surface PEW = proposed extraction well PVC = polyvinylchloride SCH = schedule 4.0 WELL MATERIALS the factory or steam cleaned on site prior t$ installation.The well screen will have smooth, 4.1 Well Casing sharp-edged openings free of burrs,chipped edges,or broken pieces on the interior and The well casing will be a 6-inch-diameter exterior surfaces of the pipe. Sections of the Schedule 40 polyvinyl chloride(PVC)pipe with screen will be received from the supplier flush threads.The casing surface will be free of wrapped in polyethylene protective wrappers solvents,oils, grease,paint, and dirt and will be with sealed ends to limit exposure to potential certified clean from the factory or steam cleaned contaminants.Wrapping will not be removed on site prior to installation. Sections of casing until the screen is to be used. will be received from the supplier wrapped in polyethylene protective wrappers with sealed 4.3 Filter Pack ends in order to limit exposure to potential contaminants. Casing will not be removed from The filter pack material will be composed f the wrapping until immediately before it is to be round,hard,water-wom siliceous sand anfree placed in the boring. of flat or elongated pieces,organic matter,or other foreign matter.All filter pack materi d will 4.2 Well Screen be protected from contamination prior to placement by either storing it in plastic-lin d The extraction well screen will be 6-inch paper bags or on plastic sheeting in a local on diameter, wire-wrapped, stainless steel with protected from the weather and contarnina'on. flush threads. All screen openings will widen All filter pack material will be placed in th inward so as to be non-clogging. The slot size annular space in the borehole by using a 2 inch will be compatible with the filter pack that will tremie pipe. Once the filter pack is in place,the surround the screen; slot size, and filter pack driller will develop the interval until no m asur- will be determined based on lithologies able decline in the filter pack is observed. described during borehole drilling. The well complete description of the guidelines to used screen will be of sufficient size and design to for the installation of filter pack material i hold back and support the filter pack and in situ presented in the DDJC-SharpelTracy Cont re- soils surrounding the screen.The well screen hensive Field Work Plan(URS, 2001). surface will be free of solvents,oils, grease, paint, and dirt and will be certified clean from KA02237\01J 1Pes1-RemUna1\GW-EW-WrkP1n.dcc 5 11y2002