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MONITORING WELL PURGING PROTOCOL <br /> MEASURE AND RECORD DEPTH TO WATER AND <br /> WELL TOTAL DEPTH <br /> OT <br /> CALCULATE PURGE VOLUME BY <br /> USING THE FOLLOWING EQUATION: <br /> P=71r2hx7.48x3 <br /> where: <br /> P=calculated purge volume(gallons) <br /> 7c=3.14 <br /> r=radius of well casing in feet <br /> h=height of water column in feet <br /> EVACUATE WATER FROM WELL EQUAL TO <br /> THE CALCULATED PURGE VOLUME WHILE <br /> MONITORING GROUNDWATER <br /> STABILIZATION INDICATOR PARAMETERS <br /> (pH,CONDUCTIVITY,TEMPERATURE)AT <br /> INTERVALS OF ONE CASING VOLUME. <br /> WELL EVACUATED TO PRACTICAL LIMITS <br /> OF DRYNESS BEFORE REMOVING <br /> ® CALCULATED PURGE VOLUME <br /> NO YES <br /> FINAL TWO SETS OF GROUNDWATER <br /> STABILIZATION INDICATOR PARAMETER <br /> MEASUREMENTS MEET THE FOLLOWING _ <br /> CRITERIA: WELL RECHARGES TO A LEVEL <br /> pH =f 0.1 pH units SUFFICIENT FOR SAMPLE <br /> COND. =±10% COLLECTION WITHIN 24 HOURS <br /> TEMP. =t 1.0 OF OF EVACUATION TO DRYNESS. <br /> YES NO YES NO <br /> I <br /> WELL PURGING CONTINUE PURGING;EVACUATE FIELD TEST FIRST RECORD WELL <br /> CRITERIA MET; ADDITIONAL CASING VOLUME RECHARGE WATER FOR AS DRY FOR <br /> PROCEED TO OF WATER,MONITORING INDICATOR PARAMETERS, PURPOSES OF <br /> WELL SAMPLING: INDICATOR PARAMETERS FOR THEN PROCEED TO WELL SAMPLING. <br /> STABILITY. SAMPLING. <br /> EMCON <br /> FIGURE <br /> MONITORING WELL PURGING PROTOCOL UR <br />