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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />4�64 MONITORING WELL PURGING PROTOCOL <br />MEASURE AND RECORD DEPTH TO WATER AND <br />WELL TOTAL DEPTH <br />OT <br />CALCULATE PURGE VOLUME BY <br />USING THE FOLLOWING EQUATION: <br />P=nrzhx7.48 x3 <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 <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 />NO <br />FINAL TWO SETS OF GROUNDWATER <br />STABILIZATION INDICATOR PARAMETER <br />MEASUREMENTS MEET THE FOLLOWING <br />CRITERIA: <br />pH = f 0.1 pH units <br />COND. = f 10 % <br />TEMP. = f 1.0 °F <br />YES <br />WELL PURGING <br />CRITERIA MET, <br />PROCEED TO <br />WELL SAMPLING <br />NO <br />CONTINUE PURGING; EVACUATE <br />ADDITIONAL CASING VOLUME <br />OF WATER, MONITORING <br />INDICATOR PARAMETERS FOR <br />STABILITY. <br />1 YES i <br />WELL RECHARGES TO A LEVEL <br />SUFFICIENT FOR SAMPLE <br />COLLECTION WITHIN 24 HOURS <br />OF EVACUATION TO DRYNESS. <br />YES I I NO <br />TESTFIRST <br />RECORD WELL <br />4RGE WATER FOR <br />AS DRY FOR <br />ATOR PARAMETERS, <br />PURPOSES OF <br />PROCEED TO WELL <br />LING. <br />, <br />SAMPLING. <br />('` FIGURE <br />EMCO MONITORING WELL PURGING PROTOCOL <br />