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THE REMEDIATION GROUP, Inc <br /> PROTOCOL FOR <br /> GROUNDWATER QUALITY SAMPLING <br /> 1.0 .INTRODUCTION <br /> This document describes procedures to be followed while sampling groundwater from monitoring <br /> wells Field measurements will be performed on groundwater samples collected from monitoring <br /> wells for water quality analyses <br /> The procedures herein are intended to be of general use As the work progresses, and if <br /> warranted, appropriate revisions may be made <br /> 2.0 SAMPLING <br /> 2.1 Sample Collection <br /> Prior to sample collection, well measurements, such as water level depth and free-floating product <br /> thickness, will be performed Individual samples from wells will be collected as follows <br /> A Wells will be purged by pumping or bailing until the volume of purge water equals a <br /> minimum of four well casing volumes To assure that the water samples are <br /> representative of the aquifer, periodic field measurements of the temperature, ph, and <br /> specific conductance will be made as described in Section 3 0 The sample will be <br /> collected only when the temperature, pH, and specific conductance reach a more or less <br /> constant value For newly completed wells (such as monitoring wells), it may be <br /> necessary to pump the well for a longer period of time because of water contamination <br /> by drilling fluids and/or cement <br /> B A positive-displacement pump (bladder or reciprocating) and/or bailer will be used for <br /> evacuating the well casing If the discharge rate using this equipment is too slow to be <br /> practical, an electric submersible pump will be used A positive-displacement Teflon <br /> bladder pump with Teflon tubing, a positive-displacement Teflon reciprocating pump with <br /> Teflon tubing, and/or a Teflon, stainless steel or disposable, factory-cleaned, polyethylene <br /> bailer will be used to collect the water samples for laboratory chemical analysis <br /> Pumping equipment may be permanently installed(dedicated) in each shallow monitoring <br /> well in the sampling network, in which case the dedicated (bladder) pumps will be used <br /> to both purge and sample the wells <br /> protocol gw 1 16 July 1994 <br />