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SOP No. 22.0 Purging and Sampling Monitoring Well <br />1.0 PURPOSE AND SCOPE <br />This Standard Operating Procedure (SOP) describes the method by which a groundwater <br />monitoring well is to be evacuated and sampled to obtain a representative sample of <br />formation water. Wells are purged to remove stagnant water from the casing but <br />excessive purging can also yield non-representative results. Wells with slow recovery <br />rates create a logistical problem because of the time required for purging. Wells with <br />slow recovery rates (low-yield) create a logistical problem because of the time required <br />for purging; where as a high-yield well is defined as one in which the water level <br />recovers almost immediately after water is removed. The procedure addresses the types <br />of equipment, field purging and sampling procedures, field data collection and personnel <br />responsibilities needed to ensure representative data. <br />2.0 RESPONSIBILITIES AND QUALIFICATIONS <br />The project manager or their designated representative will be responsible for <br />implementing this SOP. <br />3.0 EQUIPMENT LIST <br />• Teflon bailer/ pump <br />(Grundfos or ProActive) <br />• Tubing for pump <br />• Nylon rope for bailer <br />• Water level indicator <br />• Water quality meter (YSI 556) to collect the following field parameters: <br />temperature, conductivity, pH, oxygen-reduction potential and dissolved <br />oxygen. <br />• Sample bottles/ 40-m1 vials <br />• Knife <br />• Sample gloves <br />• Paper towels <br />• Waste containers (gallon jug and trash bag) <br />• Pump and suction hose <br />4.0 RELATED STANDARD OPERATING PROCEDURES <br />SOP 6.0 Water Table Elevation <br />SOP 66.0 Well Development <br />SOP 8.0 Field Equipment Calibration <br />SOP 21.0 Well recovery rate determination <br />SOP 20.1 Sample Shipping Methods <br />SOP 52.0 Note Taking and Log Book Entries <br />SOP 10.0 Decontamination of Sampling Equipment <br />SOP 32.0 Well Casing Volume Determination <br />7/17/07 Page 1 of 9 <br />R Squared Inc.