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r <br />u <br />0 <br />0 <br />U <br />d <br />LI <br />1 <br />I <br />!.l <br />I11 <br />�J <br />J <br />91 <br />91 <br />1-111 <br />I <br />u <br />11 <br />Qaj/"Om �* 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=rcPhx7.48x3 <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 />I NO I <br />FINAL TWO SETS OF GROUNDWATER <br />STABILIZATION INDICATOR PARAMETER <br />MEASUREMENTS MEET THE FOLLOWING <br />CRITERIA: <br />pH =1 0.1 pH units <br />COND. =±10% <br />TEMP. =± I.0 °F <br />YES I I NO <br />WELL PURGING CONTINUE PURGING; EVACUATE <br />CRITERIA MET; ADDITIONAL CASING VOLUME <br />PROCEED TO OF WATER, MONITORING <br />WELL SAMPLING: INDICATOR PARAMETERS FOR <br />STABILITY. <br />I YES I <br />WELL RECHARGES TO A LEVEL <br />SUFFICIENT FOR SAMPLE <br />COLLECTION WITHIN 24 HOURS <br />OF EVACUATION TO DRYNESS. <br />YES NO <br />TEST FIRST RECORD WELL <br />kRGE WATER FOR AS DRY FOR <br />&TOR PARAMETERS, PURPOSES OF <br />PROCEED TO WELL SAMPLING. <br />FIGURE <br />EMCON <br />MONITORING WELL PURGING PROTOCOL UR <br />