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i <br /> ® ' i <br /> MONITORING WELL PURGING PROTOCOL <br /> MEASURE AND RECORD DEPTH TO WATER ARID <br /> WELL TOTAL DEPTH <br /> OT <br /> CALCULATE PURGE VOLUME BY <br /> USING THE FOLLOWING EQUATION: <br /> P=xrZhx7.48x3 <br /> where: <br /> P=calculated purge volume(gallons) <br /> n=3.14 <br /> r=radius ofweli casing in feet <br /> h=height of water column in feet <br /> EVACUATE WATER FROM WELL EQUAL TO i <br /> THE CALCULATED PURGE VOLUME WHILE i <br /> MONITORING GROUNDWATER <br /> STABILIZATION INDICATORPARAMETERS <br /> (pH,CONDUCTIVITY,TEMPERATURE)AT <br /> INTERVALS OF ONE CASING VOLUME. <br /> i <br /> f <br /> WELL EVACUATED TO PRACTICAL L1141 S <br /> OF DRYNESS BEFORE REMOVING <br /> CALCULATED PURGE VOLUME <br /> i <br /> i <br /> NO YES <br /> E <br /> FINAL TWO SETS OF GROUNDWATER <br /> STABILIZATION INDICATOR PARAMETER E <br /> MEASUREIAENTS MEET THE FOLLOWING <br /> CRITERIA.: WELL RECHARGES TO A LEVEL <br /> pH =t 0.1 pH units SUFFICIENT FOR SAMPLE <br /> COND. =±10% COLLECTION WITHIN 24 HOURS <br /> TEMP. =t 1.0°F OF EVACUATION TO DRYNESS. <br /> i <br /> i <br /> YES NO YES NO <br /> WELL PURGING CORITINUE PURGING;EVACUATE FIELD TEST FIRST RECORD WELL j <br /> CRITERIA NET; ADDITIONAL CASING VOLUME RECHARGE WATER FOR AS DRY FOR <br /> PROCEED TO OF WATER,MONITORING J IINDICATOR PARAMETERS, PURPOSES OF I <br /> ViBLL SAMPLING_ INDICATOR PARAMETERS FOR THEN PROCEED TO WELL SAMPLING. <br /> STABILITY. SAMPLING. <br /> i <br /> EMCON <br /> FIGURE <br /> MONITORING WELL PURGING PROTOCOL ..'� <br />