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GEOMATRIX <br /> PROTOCOL <br /> SAMPLING OF GROUNDWATER MONITORING WELLS <br /> AND WATER SUPPLY WELLS <br /> 1.0 INTRODUCTION <br /> This protocol describes the procedures to be followed during sampling of groundwater <br /> monitoring wells and water supply wells for laboratory chemical analysis. The laboratory must <br /> be certified by the appropriate regulating agency for the analyses to be performed. <br /> The procedures presented herein are intended to be of general use and may be supplemented by <br /> a work plan and/or health and safety plan. As the work progresses and if warranted, <br /> appropriate revisions may be made by the project manager. Detailed procedures in this <br /> protocol may be superseded by applicable regulatory requirements. <br /> 2.0 SAMPLING <br /> 2.1 SAMPLE COLLECTION <br /> A. Monitoring Wells <br /> Methods for purging and sampling monitoring wells with dedicated and non-dedicated <br /> equipment are described in this Section. When practical,the purging and sampling technique <br /> adopted for a given site will remain consistent from one sampling event to the next. <br /> A.I Purging Monitoring Wells <br /> A submersible pump,diaphragm pump,positive displacement pump,which may contain a <br /> bladder, or a bailer will be used for evacuating r.,,,rtr;r� l the moriitor'ng well casing. If the <br /> 5V _01 gl ` <br /> well is to be sampled using equipment that must be separately introduced into the well,the <br /> purge intake will be located near the top of the water column for removal of at least one casing <br /> volume to remove stagnant water above the screened interval in the well casing; the pump may <br /> then be moved to the midscreen interval to complete the purging progress, if required. If a <br /> bailer is used to purge the monitoring well, it will be gently lowered into the well to reduce the <br /> potential for aeration of water. Purging will progress at a rate intended to minimize differential <br /> drawdown between the interior of the well screen and the filter material to limit cascading <br /> L\Doc_Safe\PROTOCOLAPROTO-MW.doc SAMPLING OF GROUNDWATER MONITORING WELLS AND WATER SUPPLYWELL.q <br /> Revision Date March 1996 Page)of 9 <br />