Laserfiche WebLink
1 <br /> ' 24 June 2005 <br /> AGE-NC Project No 95-0103 <br /> ' Page 5 of 12 <br /> ' 3.0. FINDINGS <br /> From field data collected at the ground water treatment system(flow volume)between 18 December <br /> 2004 and 10 May 2005, AGE calculated the approximate mass and volume of TPH-g and benzene <br /> removed Ground water flow direction and gradient was determined from the field data collected on <br /> 10 May 2005,the contaminant and geo-chemical condition of ground water on 10 and 11 May 2005 <br /> ' was assessed from laboratory data <br /> ' 3 1 GROUND WATER TREATMENT RESULTS <br /> Between 18 December 2004 and 10 May 2005, the pump-and-treat system extracted and treated <br /> ' approximately 219,928 gallons of impacted ground water(Table 4),for a total of 3,701,758 gallons <br /> of water treated since ground water extraction began in April 2002 <br /> 3 1 1 Laboratory Analysis sis of Influent and Effluent Ground Water Samples <br /> p <br /> '• TPH-g and BTEX compounds were detected In the influent samples and ground water extraction <br /> samples collected from wells EW-1, EW-2 and EW-3 The following is a summary of the detected <br /> concentrations <br /> • 26 January 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 7,500 micrograms liter(µg11),9µg/l benzene,7 1 µg/1 toluene,370 µg/1 ethylbenzene and <br /> 280 µg11 xylenes TPH-g, BTEX compounds concentrations were detected in sample EW-2 <br /> at 8,100 µg11,120 µg/l benzene, 5 3 µg/1 toluene, 76 µg/1 ethylbenzene and 50 µg11 xylenes <br /> TPH-g, BTEX compounds concentrations were detected in sample EW-3 at 10,000 ggll, <br /> 340 µg/1 benzene, 88 µg/l toluene, 300 µg/l ethylbenzene and 400 pg/l xylenes <br /> • 22 February2045 Grab groundwater samples were collected from the three extraction wells <br /> during pumping TPH-g, BTEX compounds concentrations were detected in sample EW-1 <br /> at 7,600µg11,4 6µg/1 benzene,5 1 µg/1 toluene, 170µg/1 ethylbenzene and 250µg/1 xylenes <br /> ' TPH-g, BTEX compounds concentrations were detected in sample EW-2 at 9,700 µg/l, <br /> 260 µg/1 benzene, 25 µg/l toluene, 100 gg/l ethylbenzene and 450 µg/1 xylenes TPH-g, <br /> ' BTEX compounds concentrations were detected in sample EW-3 at 9,900 µg/1, 260 µg/1 <br /> benzene, 28 µg11 toluene, 200 µg/1 ethylbenzene and 450 µg/1 xylenes <br /> • 21 March 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 8,200µg/1,7 3 µg11 benzene,5 7µg/1 toluene,670µg/l ethylbenzene and 290[Ig/1 xylenes <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 � <br />