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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 /> YES NO <br /> CALCULATE PURGE VOLUME BY <br /> MEASURE AND DOCUMENT -USING THE FOLLOWING EQUATION: <br /> FLOATING PRODUCT THICKNESS. P=n P x 7.48 x 3 <br /> DO NOT SAMPLE WELL FOR <br /> where: <br /> DISSOLVED CONSTITUENTS. 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 /> WELL EVACUATED TO PRACTICAL LIMITS MONITORING GROUNDWATER <br /> OF DRYNESS BEFORE REMOVING STABILIZATION INDICATOR PARAMETERS <br /> CALCULATED PURGE VOLUME (pH, CONDUCTIVITY, TEMPERATURE)AT <br /> INTERVALS OF ONE CASING VOLUME. <br /> NO YES <br /> FINAL TWO SETS OF GROUNDWATER <br /> STABILIZATION INDICATOR PARAMETER <br /> MEASUREMENTS MEET THE FOLLOWING <br /> WELL RECHARGES TO A LEVEL <br /> CRITERIA: <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 /> YE5 NO YES NO <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 /> FIGURE <br /> EMCON MONITORING WELL PURGING PROTOCOL A-1 <br />