Laserfiche WebLink
f <br /> MONITORING WELL PURGING PROTOCOL ! <br /> j <br /> MEASURE AND RECORD DEPTH TO WATER AND ! <br /> WELL TOTAL DEPTH i <br /> OWT <br /> CALCULATE PURGE VOLUME BY <br /> USING THE FOLLOWING EQUATION: <br /> P=7c eh x 7.48 x 3 <br /> where: <br /> P=calculated purge volume(gallons) I <br /> =3.14 <br /> r=radius of well casing in feet <br /> h=height of water column in feet E <br /> EVACUATE WATER FROM WELL EQUAL TO <br /> THE CALCULATED PURGE VOLUME WHILE <br /> I <br /> MONITORING GROUNDWATER I <br /> STABILIZATION INDICATOR PARAMETERS j <br /> (pH,CONDUCTIVITY,TEMPERATURE)AT <br /> INTERVALS OF ONE CASING VOLUME. <br /> I <br /> WELL EVACUATED TO PRACTICAL LIMITS <br /> OF DRYNESS BEFORE REMOVING I <br /> CALCULATED PURGE VOLUME <br /> NO <br /> e YES i <br /> FINAL TWO SETS OF GROUNDWATER i <br /> STABILIZATION INDICATOR PARAMETER <br /> MEASUREMENTS MEET THE FOLLOWING i <br /> CRITERIA: WELL RECHARGES TO A LEVEL i <br /> PH = 0.1 pH units SUFFICIENT FOR SAMPLE <br /> COND. =f 10% COLLECTION WITHIN 24 HOURS <br /> TEMP. =f 1.0 OF OF EVACUATION TO DRYNESS. <br /> IWELLSAMPLING'.iINDICATOR <br /> NO YES <br /> NO ! <br /> NTINUE PURGING;EVACUATE FIELD TEST FIRST RECORD WELL <br /> DITIONAL CASING VOLUME RECHARGE WATER FOR I DRY FOR 1 <br /> WATER,MONITORING INDICATOR PARAMETERS, PURPOSES OF <br /> ICATOR PARAMETERS FOR THEN PROCEED TO WELL SAMPLING <br /> STABILITY. SAMPLING. <br /> FIGURE 4 <br /> EMCONMONITORING WELL PURGING PROTOCOL �� <br /> i <br /> I <br /> j <br />