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DATA GAP ASSESSMENT WORK PLAN <br /> Stockton Charter Way Commingled Plume <br /> July 30, 2014 <br /> Each well designated for pressure-grout will be destroyed using neat cement with a tremie pipe system, <br /> pressure applied, cut at 2.5 feet bgs and the remaining casing overfilled forming a mushroom grout <br /> cap/surface seal at a minimum of one foot over the shortened top of casing. If groundwater is expelled <br /> during the grouting process, it will be properly contained, characterized, and disposed. The former well <br /> locations will be airknifed one foot greater than the original diameter of the borehole to three feet bgs and <br /> then backfilled and resurfaced with appropriate materials to match the existing grade. <br /> Wells designated to be decommissioned by over-drilling will be drilled using augers larger than the <br /> original borehole, removing material within the original borehole including the well casing, filter pack, <br /> and annular seal. The borehole will then be grouted with neat cement using a tremie pipe system from <br /> the bottom of the borehole to approximately 2.5 ft bgs. If groundwater is expelled during the grouting <br /> process, it will be properly contained, characterized, and disposed. Soil cuttings and well material waste <br /> will also be properly contained, characterized, and disposed. The borehole locations will be resurfaced <br /> with appropriate materials to match the existing grade. <br /> 3.5 Waste Disposal <br /> Soil cuttings,drilling fluids,purge water,decontamination water and used personal protective equipment <br /> (PPE)generated during drilling operations will be containerized in Department of Transportation (DOT)- <br /> approved 55-gallon drums and temporarily stored at the Site pending characterization and disposal.Upon <br /> characterization, wastes will be transported by an appropriate disposal contractor to a licensed <br /> disposal/treatment facility. <br /> 7 <br />