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' PROTOCOL GEOMATRIX <br /> t 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 <br /> must 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 <br /> ' by 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 ' protocol may be superseded by applicable regulatory requirements.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- <br /> dedicated equipment are described in this Section. When practical, the purging <br /> and sampling technique adopted for a given site will remain consistent from one <br /> ' sampling event to the next. <br /> ' A.l Purzing Monitoring Wells <br /> A submersible pump, diaphragm pump, positive displacement pump, which <br /> ' may contain a bladder, or a bailer will be used for evacuating (purging) the <br /> monitoring well casing. If the well is to be sampled using equipment that <br /> must be separately introduced into the well, the purge intake will be <br /> ' 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 <br /> SAMPLING OF GROUNDWATER MONITORING WELLS <br /> AND WATER SUPPLY WELLS Page I of 10 <br /> ' MSC PRO TO-N4W'.TST REVISION DA TE:)PARCH 1995 V[W-I <br />