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• •k <br /> 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 /> MEASURE AND DOCUMENT CALCULATE PURGE VOLUME BY <br /> FLOATING PRODUCT THICKNESS. USING T1-T-- FOLLOWING EQUATION: <br /> DO NOT SAMPLE WELL FOR P = jT r''-h x 7.48 x 3 <br /> DISSOLVED CONSTITUENTS. where:. <br /> P= calculated purge volume(gallons) <br /> a=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 /> 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 /> 0 INTERVALS OF ONE CASING 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 = ±0.1 pH units SUFFICIENT FOR SAMPLE <br /> COND. =± 10 % COLLECTION WITHIN 24 HOURS <br /> TEMP. = *— 1.0 °F OF EVACUATION TO DRYNESS. <br /> YES 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 />