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