Laserfiche WebLink
14 December 2005 <br /> • AGE-NC Project No 95-0167 <br /> Page 3 of 4 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the June 2005 ground water monitoring event TPH-g was detected in ground water samples <br /> collected from monitoring wells MW-1 and MW-2 at a concentrations of 85,000 micrograms per <br /> liter (µg/]) and 160 µgll, respectively <br /> ' BTEX compounds were detected in the ground water samples collected from monitoring wells <br /> MW-1 and MW-2 at concentrations of 40,000 µg/l benzene, 26,000 µg/l toluene, 2,500 µg/l <br /> ethylbenzene,and 14,500µg/1 total xylenes in MW-1,and 10 µg/1 benzene,5 7 µg11 toluene,and 7 1 <br /> µg/t total xylenes in MW-2 <br /> Methyl-tert-butyl-ether (MtBE)was detected in MW-1 at a concentration of 61 µg/l <br /> Fuel additive t-Amyl Methyl Ether(TAME)was detected in MW-1 at a concentration of 58µg/l,and <br /> additive 1,2-Dichloroethane (1,2-DCA) was detected in MW-1 and MW-2 at concentrations of <br /> ' 51 µg/1 and 2 3 µg/l, respectively <br /> Analytical results of ground water samples collected during the September 2005 monitoring event <br /> are summarized in Table 2 Figure 4 illustrates the estimated lateral distribution of dissolved TPH-g <br /> at the site The laboratory report (CTEL Project No CT214-0509095), quality assurance/quality <br /> control (QA/QC) report, and chain of custody forms are included in Appendix C Documents <br /> confirming the upload of laboratory electronic deliverable format (EDF) files and depth to water <br /> measurements to GeoTracker are included in Appendix D <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> • On 12 September 2005,depths to ground water ranged from 14 54 feet(MW-7)to 15 78 feet <br /> (MW-6) below the tops of the well casings Ground water elevations at the site averaged <br /> approximately 3 92 feet below mean sea level (MSL), Indicating an average elevation <br /> decrease of 0 84 feet since the last monitoring event in June 2005 (Table 1) <br /> ' Ground water flow was determined to be towards the east-northeast under hydraulic <br /> gradients ranging from 0 003 ft/ft to 0 013 ft/ft <br /> • TPH-g was detected in ground water samples collected from monitoring wells MW-I and- <br /> MW-2 at concentrations of 85,000µg/1 and 160 µg11, respectively BTEX compounds were <br /> detected in the ground water samples collected from monitoring wells MW-1 and MW-2 at <br /> maximum concentrations of 40,000 µg/1 benzene, 26,000 µg/1 toluene, 2,500 µg/I <br /> ethylbenzene, and 14,500 µg/l total xylenes in MW-1 <br /> rAdvanced GeoEnvvonmentai,Inc <br />