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Active Groundwater Sampling Standard Operating Procedure <br /> SWE-FSOP-401;Revision 1 Ahtna Southwest Environmental Operations <br /> 1.4 Definitions <br /> Bailer.A bottom-filling cylindrical tube with a check valve at the bottom.A bailer is not recommended for <br /> sampling volatile organic compounds (VOCs), gasoline range organics (GRO), or metals. <br /> Bladder Pump. A positive-displacement pump is used to pump groundwater to the surface from most <br /> depths. A bladder pump can be small enough to sample from wells as small as 3/4-inch in diameter. <br /> Peristaltic Pump.A negative air pressure pump is used to draw groundwater to the surface.These pumps <br /> can be used if the depth to water is less than approximately 25 feet. Due to a potential loss of the volatile <br /> fraction from negative pressure gradients, peristaltic pumps are generally not recommended for well <br /> purging and sampling when VOC analysis is required. <br /> Submersible Pump. A positive-displacement pump is used to pump groundwater to the surface. <br /> Achievable depths are limited by the power of the pump and the length of the wiring. The well must be <br /> at least 2 inches in diameter. <br /> 2.0 Relevant Documents <br /> This SOP focuses on the groundwater purging and sample collection tasks and applications and should be <br /> used in conjunction with other applicable SOPS, including the following: <br /> Standard Operating Procedures <br /> SWE-FSOP-001, Field Documentation <br /> SWE-FSOP-002, Field Sample Management <br /> SWE-FSOP-101, Water Quality Measurements <br /> SWE-FSOP-102, Groundwater and NAPL Measurements <br /> SWE-FSOP-801, Equipment Decontamination <br /> SWE-FSOP-802, IDW Management <br /> Field Forms <br /> SWE-FFRM-004, Daily PFAS Sampling Checkist [PFAS Projects] <br /> SWE-FFRM-300, Groundwater Sampling <br /> SWE-FFRM-501, Water Level/NAPL Measurements <br /> SWE-FFRM-801, Equipment Calibration <br /> 3.0 Equipment and Materials List <br /> Multiple types of equipment can be used to purge and sample groundwater. The correct equipment to <br /> use should be determined by the PL based on site conditions and analyses to be performed. <br /> Materials used during groundwater sampling must not absorb, desorb, or leach contaminants of concern <br /> from or into a potential groundwater sample. The materials used must be resistant to chemical and <br /> biological degradation. <br /> Page 5 of 14 <br />