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Geosyntec <br /> consultants <br /> • All downhole equipment will be decontaminated by steam cleaning or washing <br /> in a solution of laboratory-grade detergent prior to, between, and after use; <br /> • The total depth of the well and the water level will be measured; <br /> • Approximately one casing volume of water will be removed from the well using <br /> a submersible pump or bailer; <br /> • The well will be surged for a period of 15 to 30 minutes; <br /> • Following surging, additional water will be removed from the well by bailing or <br /> pumping; <br /> • Periodically during development, water samples will be collected and analyzed <br /> for water quality parameters (pH, specific conductance, temperature, turbidity); <br /> and, <br /> • The process of surging and bailing or pumping will.continue until a minimum of <br /> ten casing volumes of groundwater have been removed and water quality <br /> parameters stabilize. <br /> Water purged from the wells will be contained in drums, labeled, and remain at the Site <br /> pending appropriate disposal. <br /> 2.3.5 Groundwater Sampling <br /> At least 48 hours after well development is complete, groundwater samples will be <br /> collected from each well according to the following general procedures: <br /> • Purging and sampling equipment will be cleaned in a solution of <br /> laboratory-grade detergent and distilled water and rinsed with distilled water; <br /> • The water level and total depth at each well will be measured and recorded; <br /> • Wells will be purged using the .U.S. EPA Low Flow (Minimal Drawdown) <br /> Ground-Water Sampling Procedures (U.S.EPA, 1996); <br /> • During purging, general water quality parameters (pH, specific conductance, <br /> turbidity, and temperature)will be periodically measured and recorded; <br /> • Purging will continue until water quality parameters stabilize; <br /> Final Work Plan.doc 12 27 June 2012 <br />