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24 April 2007 <br /> AGE-NC Project No. 04-1207 <br /> Page 6 of 9 <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the first quarter sampling event,petroleum hydrocarbons were detected only in monitoring <br /> well MWA. TPH-g was detected at a concentration of 1,500 micrograms per liter (µg/1). BTEX <br /> compounds were detected atthe following concentrations: 18µg/1 toluene,25 µg/1 ethylbenzene,and <br /> 127 µg/1 total xylenes. <br /> No other analytes were detected at or above laboratory detection limits in the ground water samples <br /> analyzed. The analytical results of the ground water samples collected on 18 January 2007 are <br /> summarized in Table 3. Figure 5 depicts the estimated lateral distribution of dissolved TPH-g at the <br /> site. The laboratory report (CTEL Project No. CT214-0701132), QA/QC reports, and chain of <br /> custody form are included in Appendix E. <br /> 3.3. SOIL-VAPOR EXTRACTION FINDINGS <br /> Between 05 February 2007(initiation of S VE remediation)and 28 March 2007(last S VE monitoring <br /> of the quarter),the SVE unit operated for approximately 580 hours; influent flow rates ranged from <br /> approximately 38 standard cubic feet per minute (scfin)to 90 scfm (Table 2). <br /> Hydrocarbon concentrations detected in influent soil vapor samples were as follows: <br /> • 05 February 2007-TPH-g was detected at 1,900µg/1,benzene at 4.2µg/l,toluene at 80µg/1, <br /> ethylbenzene at 26 pg/1, and total xylenes at 130 µg/1. <br /> • 12 February 2007 - TPH-g was detected at 6,100 µg/1, toluene at 54 µg/1, ethylbenzene at <br /> 25 µg/1, and total xylenes at 110 µg/1. <br /> • 19 February 2007-TPH-g was detected at 6,600 gg/l,benzene at 4.8µg/1,toluene at 28µg/1, <br /> ethylbenzene at 15 µg/1, and total xylenes at 65 µg/1. <br /> • 26 February 2007-TPH-g was detected at 1,200µg/1,benzene at 9.2 µg/1,toluene at 27µg/1, <br /> ethylbenzene at 19 gg/l, and total xylenes at 65 µg/l. <br /> • 05 March 2007 - TPH-g was detected at 3,300 µg/l, toluene at 32 µg/1, ethylbenzene at <br /> 20 µg/1, and total xylenes at 86 µg/1. <br /> • 12 March 2007-TPH-g was detected at 280µg/1,toluene at 28µg/l,ethylbenzene at 18 gg/l, <br /> and total xylenes at 68 µg/1. <br /> • 19 March 2007-TPH-g was detected at 700µg/1,toluene at 21 µg/1,ethylbenzene at 13 µg/1, <br /> and total xylenes at 42 µg/1. <br /> Advanced GeoEnvironmental,Inc. <br />