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t24 June 2005
<br /> AGE-NC Project No 95-0103
<br /> Page 6 of 12
<br /> ' TPH-g, BTEX compounds concentrations were detected in sample EW-2 at 8,900 µg/1,
<br /> 130µg/1 benzene, 12µg11 toluene,94µg11 ethylbenzene and 170µg/1 xylenes TPH-g,BTEX
<br /> compounds concentrations were detected in sample EW-3 at 11,000 µg/l,200µg/1 benzene,
<br /> ' 18 µg11 toluene, 390 µg/1 ethylbenzene and 480 µg11 xylenes
<br /> 25 April 2005 Grab ground water samples were collected from the three extraction wells
<br /> during pumping TPH-g, BTEX compounds concentrations were detected in sample EW-1
<br /> at 5,300µg11, 11 µg/l benzene,4 2µg11 toluene,560µg11 ethylbenzene and 150 µg/l xylenes
<br /> TPH-g, BTEX compounds concentrations were detected in sample EW-2 at 2,100 µg11,
<br /> 1 39µg/1 benzene,<0 5 µg11 toluene, 14µg/1 ethylbenzene and 4 6µg/l xylenes TPH-g,BTEX
<br /> compounds concentrations were detected in sample EW-3 at 28,000 µg/l, 850µg11 benzene,
<br /> 95 µg/l toluene, 820 µg/l ethylbenzene and 3,100 µg/1 xylenes
<br /> • 11 May 2005 Grab ground water samples were collected from the three extraction wells
<br /> during pumping in conjunction with the sampling of three other inonitoring wells TPH-g,
<br /> BTEX compounds concentrations were detected in sample EW-1 at 1,000 µg/1, <0 5 µg/1
<br /> benzene, <0 5 µg/1 toluene, 31 µg/1 ethylbenzene and 50 µg/l xylenes TPH-g, BTEX
<br /> compounds concentrations were detected in sample EW-2 at 2,400 µg/1, 70 µg/1 benzene,
<br /> 7 4 µg/1 toluene, 40 µg/1 ethylbenzene and 45 µg/1 xylenes TPH-g, BTEX compounds
<br /> • concentrations were detected in sample EW-3 at 8,300 µg/1, 400 µg/l benzene, 32 µg/1
<br /> toluene, 480 µg/1 ethylbenzene and 1,500 µg/1 xylenes
<br /> TPH-g/d, BTEX compounds and fuel additives were not detected in the effluent ground water ,
<br /> treatment samples analyzed The analytical results are summarized in Table 4, laboratory reports
<br /> (CTEL 0501154,0502145,0502166,0503211,0504239 and 0505111)are provided in Appendix C
<br /> Trend analysis of the extraction well concentrations is depicted in Appendix D
<br /> I3 12 Volume-Mass Removal Calculations
<br /> During remediation in first and second quarters of 2005 an estimated 0 298 lbs of benzene and
<br /> 14 68 lbs of TPH-g were extracted from ground water The first and second quarters 2005
<br /> volume-mass calculations from the ground water treatment system are presented in Appendix D
<br /> 3 2 GROUND WATER MONITORING RESULTS
<br /> 1
<br /> Geochemical parameters of ground water were collected during well purging were used to evaluate
<br /> low-flow ground water sampling techniques Ground water elevation and flow direction were
<br /> determined from field data The geochemical parameters and hydrocarbon-impact to ground water
<br /> was quantified from laboratory analysis of the ground water samples
<br /> tAdvanced GeoEnvironmental,Inc
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