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I18 November 2003 <br /> AGE-NC Project No 95-0128 <br /> Page 4 of 7 <br />' The BTE&X concentrations varied greatly between April and September 2003 Benzene <br /> ranged from below detectable limits in May to 260 ug/l in July The remaining BTE&X <br /> compounds ranged from below detecable limits to 270 ug/1 during this time period <br /> • MTBE concentrations were fairly stable through this time period, fluctuating between 190 <br /> ug/1 and 300 ug/1 <br />' TPH-g,TPH-d,MTBE and BTEX were not detected in the effluent samples The pH measurements <br /> Iwere within permitted discharge levels <br /> The analytical results are summarized on Table 3 The laboratory reports for the quarterly monitoring <br /> I event (MAI Laboratory ID Nos 0304252, 0305254, 0305446, 0306525, 0307414, 0308003, <br /> 0303207 and 0309221), quality assurance and quality control (QA/QC) reports and the chain-of- <br /> custody form are included in Appendix C <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 179,479 gallons was extracted between <br /> 10 March and 11 September 2003, based on effluent flow meter observations <br /> Based on the total watervolume extracted,0 17 kg/0 37 lbs of MTBE,0 102 kg/0 225 lbs of benzene <br /> and 0 844 kg/1 86 lbs of TPH-g were removed frorn the site and treated <br /> The hydrocarbon mass removal calculations and the concentration trends of the influent samples over <br /> time are displayed in Appendix D <br /> 3 3 GROUND WATER ELEVATION AND GRADIENT <br /> The depth to giound water on 02 October 2003 ranged from 33 98 feet (MW-15) to 36 93 feet <br /> (MW-13)below the well casings The ground water elevation calculated from the same data,ranged <br /> from 22 07 feet (MW-10) to 23 92 feet(MW-14) below mean sea level (MSL) <br /> The ground water table occurred within the screened interval of the shallow-screened monitoring <br /> wells, however, wells MW-1 to MW-3, MW-I IB and MW-12B and MW-18 are deeper-screened <br /> wells and are currently drowned The depth to ground water and ground water elevation data is <br /> • <br /> Advanced GeoEnvironwenta!Inc <br /> I <br />