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I23 September 2002 <br /> AGE-NC Project No 95-0128 <br /> Page 5 of 7 <br /> MTBE was detected by EPA Method 8260M in ground water samples MW-3, MW-4, MW-5, <br /> MW-8,MW-11A,MW1IB,MWI2A,MW-12B,MW-15andVW-1 at concentrations ranging from <br /> 3 7 gg/l in MW-3 to 1,700µg/1 in VW-1 (see Figure 4) In addition,the lead scavenger 1,2-DCA was <br /> detected in sample MW-3 at a concentration of 1 5 µg/l <br /> No other target analytes were detected in the samples analyzed The analytical results are <br /> summarized on Tables 2 and 3 The laboratory reports for the quarterly monitoring event (MAI <br /> Laboratory Work Order 0205232), quality assurance and quality control (QA/QC) reports and the <br /> chain-of-custody form are included in Appendix B <br /> 4 3 ANALYTICAL RESULTS OF GROUND WATER TREATMENT SAMPLES <br /> ITPH-d,TPH-g,Benzene and MTBE were detected in the April influent sample at concentrations of <br /> 1,100 µg/l, 5,500 µg/l, 300 µg/1 and 370 pg/l, respectively <br /> TPH-d, TPH- ,Benzene and MTBE were detected in the May influent sample at concentrations of <br /> g Y p <br /> lie <50 µg/l, 3,300 µg/l, 48 µg/1 and 300 µg/1, respectively <br /> TPH-d, TPH-g, Benzene and MTBE were detected in the June influent sample at concentrations of <br /> I <50 µg/1, 5,600 µg/l, 320 µg/1 and 360 µg/1, respectively <br /> The remaining BTEX compounds were detected in the same influent samples at concentrations <br /> ranging up to 1,200 µg/l (xylenes) TPH-d, TPH-g,BTEX and MTBE were not detected in effluent <br /> samples <br /> I The analytical results are summarized on Table 4 The laboratory reports for the quarterly monitoring <br /> event(MAI Laboratory Work Orders 0204360,0205187 and 0206099),quality assurance and quality <br /> control (QA/QC) reports and the chain-of-custody form are included in Appendix C <br /> I <br /> 44 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 281,997 gallons was extracted between <br /> I20 March and 05 June 2002, based on effluent flow meter observations <br /> Based on the total water volume extracted, 0 42 kg or 0 93 lbs of MTBE, 0 28 kg or 0 62 lbs of <br /> BTEX, 5 6 kg or 12 lbs of TPH-g and 0 67 kg or 1 5 lbs of TPH-d were removed from the site and <br /> treated <br /> IAdvanced GeoEnvironmental Inc <br />