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MONITORING WELL PURGING PROTOCOL <br /> MEASURE AND RECORD DEPTH TO WATER AND <br /> WELL TOTAL DEPTH <br /> OWT <br /> CHECK FOR FLOATING PRODUCT <br /> YE5 <br /> NO <br /> MEASURE AND DOCUMENT CALCULATE PURGE VOLUME BY <br /> FLOATING PRODUCT THICKNESS. USING THE FOLLOWING EQUATION: <br /> DO NOT SAMPLE WELL FOR P =n r;x 7.48 x 3 <br /> DISSOLVED CONSTITUENTS. where: <br /> P =calculated purge volume(gallons) <br /> r =3.14 <br /> r=radius of well casing in feet <br /> h =heizht of water column in feet <br /> EVACUATE WATER FROM WELL EQUAL TO <br /> WELL EVACUATED TO PRACTICAL LIMITS THE CALCULATED PURGE VOLUME WHILE <br /> OF DRYNESS BEFORE REMOVING MONITORING GROUNDWATER <br /> CALCULATED PURGE VOLUME STABILIZATION INDICATOR PARAMETERS <br /> (pH,CONDUCTIVITY,TEMPERATURE)AT <br /> INTERVALS OF ONE CASING VOLUME, <br /> NO <br /> ij_ E 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.l pH units SUFFICIENT FOR SAMPLE <br /> GOND. = 1 % COLLECTION WITHIN 24 HOURS <br /> TEMP. -t i..4 °F OF EVACUATION TO DRYNESS. <br /> YE5 NO <br /> YES NO <br /> WELL PURGING CONTINUE PURGING. EVACUATE FIELD TEST FIRST <br /> CRITERIA MET, ADDITIONAL CASING VOLUME RECHARGE WATER FOR RECORD WELL <br /> PROCEED TO OF WATER MONITORING INDICATOR PARAMETERS, PURPOSES <br /> DRY FOR <br /> OF <br /> WELL SAMPLING. INDICATOR PARAMETERS FOR THEN PROCEED TO WELL <br /> STABILITY. SAMPLING. <br /> SAMPLING. <br /> ;A J FIGURE <br /> VIRONMENTAL SOLUTIONS MONITORING WELL PURGING PROTOCOL A-1 <br /> A DIVISION OF EMCON <br />