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TABLE OF CONTENTS <br />Purging from High Yielding Wells <br />1. PURPOSE AND SCOPE <br />This Standard Operating Procedure (SOP) describes the method by which a high yield <br />well is to be evacuated to obtain a representative sample of formation water. wells are <br />purged to remove stagnant water from the casing, but excessive purging can also yield <br />non- representative results. 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 sampling procedures, field data collection and personnel <br />responsibilities <br />2. RESPONSIBILITIES AND QUALIFICATIONS <br />The project manager or their designated representative will be responsible for <br />implementing this SOP. <br />3. RELATED STANDARD OPERATING PROCEDURES <br />o Well development <br />a Well depth and water level determination <br />e Well casing volume determination <br />© Well recovery rate determination <br />4. EQUIPMENT LIST <br />o Pump and suction hose <br />o Meters to measure at least two of the following field parameters: <br />temperature, conductivity, pH <br />o Teflon bailer <br />5. PROCEDURES <br />1. Ensure that fine sediment has been removed by well development (prior <br />procedure). <br />2. Determine volume of water in well casing (prior procedure). <br />3. If field parameter meters have down hole probes, determine at least two field <br />parameters in the water inside the well casing before purging. <br />4. If meters do not have downhole probes, use Teflon bailer to take on sample of <br />standing water for initial field parameter determination. <br />Wildcat Mining Corporation <br />R Squared33 SOP - Purging High Producing- gmlr.doc <br />3 <br />6/10/2011 <br />