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t <br /> MONITORING WELL PURGING PROTOCOL <br /> MEASURE AND RECORD DEPTH TOW ATER A.ND ' <br /> WELL TOTAL DEPTH <br /> OWT <br /> CALCULATE PURGE VOLUME BY <br /> USING THE FOLLOWING EQUATION: I <br /> P=rtrah x7.49x3 i <br /> where: <br /> P=calculated purge volume(gallons) <br /> n=3.14 ! <br /> r=radius of well casing in feet <br /> h=height of water column in feet j <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 /> i <br /> NO YES <br /> FINAL TWO SETS OF GROUNDWATER <br /> STABILIZATION INDICATOR PARAMETER <br /> MEASUREMENTS MEET THE FOLLOWING <br /> CRITERIA: ! <br /> WELL RECHARGES TO A LEVEL <br /> PH = 0.1 pH units SUFFICIENT FOR SAMPLE <br /> TEMP.COND. =f 1 % COLLECTION WITHIN 24 HOURS <br /> TEMP =f 1..0°F OF EVACUATION TO DRYNESS. <br /> I <br /> jPUREGING ' <br /> NO YES NO <br /> WELrCONTINUEGING;EVACUATE FIELD TEST FIRSTCRIASING VOLUME RECHARGE WATER FOR CORD VdELL <br /> PRONITORING INDICATOR PARAMETERS, AS DRY FOR <br /> PURPOSESOF <br /> WELRAMETERS FOR THEN PROCEED TO WELL SAMPLING. <br /> STABILITY. SAMPLING <br /> FIGURE <br /> rMONITORING WELL PURGING PROTOCOL <br />