Laserfiche WebLink
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 />1 <br />1 <br />1 <br />MONITORING WELL PURGING PROTOCOL <br />MEASURE AND RECORD DEPTH TO WATER AND <br />WELL TOTAL DEPTH <br />I NO I <br />CALCULATE PURGE VOLUME BY <br />USING THE FOLLOWING EQUATION: <br />P=nrzhx7.48x3 <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 />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. =±10% <br />TEMP. = t 1.0 OF <br />YES <br />WELL PURGING <br />CRITERIA MET; <br />PROCEED TO <br />WELL SAMPLING. <br />CONTINUE PURGING; EVACUATE <br />ADDITIONAL CASING VOLUME <br />OF WATER, MONITORING <br />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 <br />FIELD TEST FIRST <br />RECHARGE WATER FOR <br />INDICATOR PARAMETERS, <br />THEN PROCEED TO WELL <br />SAMPLING. <br />II MONITORING WELL PURGING PROTOCOL <br />NO <br />RECORD WELL <br />AS DRY FOR <br />PURPOSES OF <br />SAMPLING. <br />