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MONITORING WELL PURGING PROTOCOL <br /> MEASURE AND RECORD DEPTH TO WATER AND <br /> W£:LL TOTAL DEPTH <br /> OWT <br /> =11ECK FOR FLOATING PRODUCT <br /> YES NO <br /> MEASURE AND DOCUMENT CALCULATE PURGE VOLUME BY <br /> FLOATING PRODUCT THICKNESS. USING TIE FOLLOWING EQUATION: <br /> DO NOT SAMPLE WELL FOR P= n r2h x 7.48 x 3 <br /> DISSOLVED CONSTITUENTS. 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 /> WELL EVACUATED TO PRACTICAL LIMITS THE CALCULATED PURGE VOLUME WHILE <br /> OF DRYNESS BEFORE REMOVING MONITORING GROUNDWATER <br /> CALCULATED PURGE VOLUME STABILIZATION INDICATOR PARAMETERS <br /> (pH, CONDUCTIVITY,TEMPERATURE)AT <br /> . INTERVALS OF ONE CASING VOLUME. <br /> NO YES <br /> FINAL TWO SETS OF GROUNDWATER <br /> STABILIZATION INDICATOR PARAMETER <br /> MEASUREMENTS MEET THE FOLLOWING <br /> CRITERIA: FOIFEVACUATION <br /> RECHARGES TO A LEVEL <br /> PH ±O.I pH units CIENT FOR SAMPLE <br /> GOND. _ ± 10 % ECTION WITHIN 24 HOURS <br /> TEMP. = ± 1.0 °F TO DRYNESS. <br /> YES NO YES NO <br /> WELL PURGING CONTINUE PURGING; EVACUATE FIELD TEST FIRST RECORD WELL <br /> CRITERIA MET; ADDITIONAL CASING VOLUME RECHARGE WATER FOR AS DRY FOR <br /> PROCEED TO OF WATER, MONITORING INDICATOR PARAMETERS, PURPOSES OF <br /> WELL SAMPLING. INDICATOR PARAMETERS FOR THEN PROCEED TO WELL SAMPLING. <br /> STABILITY. SAMPLING. <br /> nA <br /> A' FIGURE <br /> EMCON MONITORING WELL PURGING PROTOCOL A-°1 <br />