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' 06 August 2004 <br /> AGE-NC Protect No 95-0128 <br />' Page 7 of 11 <br />' 0 15 March 2004 - TPH-g and TPH-d were detected at concentrations of 420 µg/l and 1,300 <br /> µg/l BTEX compounds were detected at concentrations of 180 µg/l, 11 µg11, 98 µg/1 and <br /> 81 µg/1 MTBE was detected at a concentration of 230 µg/1 <br />' a 28 April 2004 - TPH-g was detected at a concentration 640 µg/1 BTEX compounds were <br /> detected at concentrations of 61 pg/l, no toluene, 6 6 µg/1 and 51 µg/l MTBE was detected <br />' at a concentration of 280 µg/1 <br /> • 17 May 2004 - TPH-g was detected at a concentration 1,500 µg/1 BTEX compounds were <br /> detected at concentrations of 120 µg/1,no toluene,27 µg/1 and 60 µg/1 MTBE was detected <br />' at a concentration of 200 µg/1 <br />' TPH-g,TPH-d,MTBE and BTEX were not detected In the effluent samples The pH measurements <br /> were within permitted discharge levels Metals and 624/624 concentrations were within permitted <br /> discharge levels The analytical results are summarized in Tables 3 and 4 The laboratory reports for <br />' the quarterly monitoring event(MAI Laboratory ID Nos 0310233,0311253,0402359,0403246 and <br /> CTEL Project No 214- 0312205, 0401186, 0403206, 0404208, 0405105), quality assurance and <br /> quality control(QA/QC)reports and chain of custody forms are Included in Appendix E GeoTracker <br />' confirmation pages ofthe submitted laboratory electronic deliverable format(EDF)files are Included <br /> In Appendix I <br />' 3 2 MASS CALCULATION OF RECOVERED PRODUCT <br />' The mass of hydrocarbons removed was calculated from the volume of water treated and the <br /> concentrations from laboratory analysis A total volume of 288,091 gallons was extracted between <br /> September 2003 and May 2004, based on effluent flow meter observations <br />' Based on the total water volume extracted, 0 308 kg/0 68 lbs of MTBE, 0 169 kg/0 373 lbs of <br /> benzene and 1 874 kg/4 13 lbs of TPH-g were removed from the site and treated <br /> 1 <br /> The hydrocarbon mass removal calculations and the concentration trends of the Influent samples <br /> over time are displayed in Appendix F <br />' 3 3 GROUND WATER ELEVATION AND GRADIENT <br /> The depth to ground water In March 2004 ranged from 32 25 feet(MW-15)to 35 12 feet(MW-13) <br /> below the well casings The ground water elevation calculated from the same data, ranged from <br /> 20 67 feet (MW-7) to 22 08 feet (MW-17) below MSL <br /> 1 <br /> Advanced GeoEnvironmental Inc <br /> 1 <br />