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APPENDIX C • Following surging, additional water will be removed from the well by bailing or pumping; •, Periodically during.development,water samples will be collected and analyzed for water quality parameters (pH, specific conductance,temperature,turbidity); and, • The process of surging and bailing or pumping will continue.until a minimum of ten casing volumes of groundwater have been removed and water quality parameters stabilize. Water purged from the wells will be contained in drums, labeled, and remain at the Site pending appropriate disposal. Groundwater Sampling At least 48 hours after well development is complete, groundwater samples will be collected from each well according to the following general procedures:. • Purging and sampling equipment will be cleaned in a solution of `laboratory-grade detergent and distilled water and rinsed with distilled water; • The water level and total depth at each well will be measured and recorded; • Wells will be purged using the U.S. EPA Low Flow(Minimal Drawdown) Ground-Water :Sampling Procedures (U.S.EPA, 1996); • During purging, general water quality parameters (pH; specific conductance, turbidity, and temperature)will be periodically measured and recorded; • Purging will continue until water quality parameters stabilize; • Groundwater samples will be collected using the low-flow pump and transferred into sample containers prepared by the analytical laboratory;and, • Sample containers will be sealed, labeled, and then placed in a cooler with ice for transport to the laboratory. A blind duplicate sample will be collected from one well. One equipment blank will be collected during each day of groundwater sampling. Trip blanks consisting of organic-free, deionized water will be prepared by the laboratory and will accompany the sample containers during transport to, during, and after sampling. The trip blank sample bottles will not be opened. Groundwater and QA/QC samples will be handled under standard chain of custody procedures and will be analyzed for toluene by EPA Method 8260. Purged water will be contained in drums, labeled; and remain at the facility, pending appropriate disposal.