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1 <br />t <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />4! NOUN I Z'"- :J; <br />iffMEASURE AND RECORD DEPTH <br />AN <br />AND WELL TOTALDEPTH <br />CALCULATE PURGE VOLUME BY <br />USING THE FOLLOWING EQUATION: <br />P=itr2hx7.48x3 <br />where: <br />P = calculated purge volume (gallons) <br />17 = 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 GROUND -WATER STABILIZATION <br />INDICATOR PARAMETERS <br />(pH, CONDUCTIVITY, TEMPERATURE) <br />AT INTERVALS OF ONE CASING VOLUME. <br />WELL EVACUATED TO PRACTICAL LIMIT <br />OF DRYNESS BEFORE REMOVING <br />CALCULATED PURGE VOLUME <br />m <br />FINAL TWO SETS OF GROUND -WATER <br />STABILIZATION INDICATOR PARAMETER <br />MEASUREMENTS MEET THE FOLLOWING <br />CRITERIA: <br />pH = t 0.1 pH units <br />COND. _ 10% <br />TEMP. = + 1.0 °F <br />ICONTINUE PURGING; <br />EVACUATE ADDITIONAL <br />VOLUMECASING OF <br />MONITORING <br />INDICATOR PARAMETERS <br />WE <br />O- <br />WELL RECHARGES TO A LEVEL <br />SUFFICIENT FOR SAMPLE <br />COLLECTION WITHIN 24 HOURS <br />OF EVACUATION TO DRYNESS. <br />Evi*0 <br />FIELD TEST FIRST <br />RECHARGE WATER FOR <br />INDICATOR PARAMETERS, <br />THEN PROCEED TO WELL <br />SAMPLING. <br />•'r <br />