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MONITORING WELL PURGING PROTOCOL <br /> ' MEASURE AND RECORD DEPTH TO WATER AND <br /> WELL TOTAL DEPTH <br /> CALCULATE PURGE VOLUME BY <br /> USING THE FOLLOWING EQUATION: <br /> ' <br /> P=n r2h x 7.48 x 3 <br /> where: <br /> ' P=calculated purge volume(gallons) <br /> 71=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 LB41TS <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. =f 10% COLLECTION WITHIN 24 HOURS <br /> TEMP. =t 1.0 OF OF EVACUATION TO DRYNESS. <br /> ' YES INO I YES Iv'O <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. ISAMPLING. <br /> r- <br /> ' C MONITORING WELL PURGING PROTOCOL FIGURE-1 <br />