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Section No b <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 16 of 55 <br /> 6 4 Groundwater Sampling <br /> 6 4 1 General Considerations <br /> There are numerous designs of monitoring wells and purging and sampling <br /> equipment Consequently, all the combinations will not be addressed herein <br /> However, general.- rocedures common to all techniques-will-be presented <br /> 6 4 2 Purging and Sampling Equipment <br /> Purging is typically conducted with a pump capable of pumping several <br /> gallons per minute This may be a centrifugal surface pump, a submersible <br /> pump, a surface diaphragm pump, or a submersible gas displacement pump For <br /> low-yielding wells, either a bailer or a bladder pump may be used Under no <br /> circumstances should the water in the well be aerated <br /> Sampling-may be-..-conducted with---either—a-de dicate d_b1adder—pump..-or----a-- - <br /> bailer A bailer can be either a decontaminated Teflon bailer or a dedicated <br /> single-use disposable bailer <br /> 6 4 3 Sample Container Preparation <br /> Sample container preparation will be in accordance with SW-846 and is <br /> the responsibility of the laboratory _ <br /> 6 4 4 Equipment Decontamination <br /> 6 4 4 1 General. - All equipment used to measure and sample the <br /> groundwater system (e g pumps, discharge hose, water level meters) must be <br /> cleaned before use in each well to prevent cross-contamination between wells 0 <br /> 6-16 <br />