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• 27 February 2003 <br /> AGE-NC Project No 95-0103 <br /> Page 3 of 7 <br /> 2 3 QUARTERLY GROUND WATER MONITORING AND SAMPLING <br /> On 09 January 2003, ground water monitoring and sampling were performed,on monitoring wells <br /> MW-2 through MW-6 <br /> 1 2 3 1 Well Monitoring and Evacuation <br />' A Solinst water level meter was used to measure the depth to ground water in monitoring wells <br /> MW-2 through MW-6 relative to the tops of the well casings (Table 1) The ground water elevation r <br /> in each well was calculated by subtracting the measured depth to ground water from the surveyed <br /> casing elevation <br /> After water levels were measured, between 5 and 10 gallons of ground water (a minimum of thice <br /> casing water-volumes per well)were evacuated(purged) from wells MW-2 through MW-6 utilizing <br /> polyethylene disposable bailers Temperature, pH and conductivity were measured for stabilization <br /> at regular purge-volume intervals from each well using an Oakton water analyzer, the field <br /> measurements are included in Appendix A Purged water was subsequently ti eated through the on- <br /> site ground water treatment system <br /> 2 3 2 Ground Water ater Sample Collection and AnJysis <br />' Water samples were retrieved fioni each purged well using the disposable bailers after allowing the <br /> well to achieve a minimum of 80 percent recharge prior to sample collection The samples were <br />' transferred into 40-m1 EPA-appi oved volatile organic analysis(VOA)vials containing 0 5 iril of 18% <br /> hydrochloric acid as a sample preservative The samples were properly labeled and transported in a <br /> chilled container under chain-of custody to Cal Tech Environmental Laboratories, Inc (CTEL), a <br />' DHS-certified laboratory, for analysis The ground water samples were analyzed for <br /> • TPH-g in accordance with EPA Method 8015 Modified and <br />' • BTEX and MTBE in accordance with EPA Method 8260 <br /> 3 0. FINDINGS <br />' From field data collected at the ground water treatment system between 22 August and <br /> 27 December 2002,AGE determined the average TPH-g and benzene concentrations and the average <br /> flow rate,and calculated the approximate mass and volume of TPH-g and benzene removed Ground <br /> Advanced GeoEnvir0nu1eut41,Inc <br />