ARCHIVED REPORTS_XR0005174 - Laserfiche WebLink

Home Browse Search

1 27 February 2003 t AGE-NC Project No 95-0103 Page 6 of 7 Based on the results of ground water remediation activities, AGE concludes the following • Between 22 Augdst and 27 December 2002, the pump-and-treat system processed approximately 809,488 gallons of water ' • Dissolved hydrocarbons were detected from ground water samples collected at the influent end of the treatment system. Based on the amount of ground water processed and labor atory analytical results, approximately 1 12 lbs of benzene and 31 9 lbs of TPH-g were removed ' from the extracted ground water(Table 1) • Cumulative totals of 4 3 lbs of Benzene and 95 9 lbs of TPH-g are estimated to have been ' extracted since ground water treatment began on 02 April 2002 Based on the results of the 09 January 2003 monitoring event, AGE concludes the following • The average gt ound water level was approximately 15 feet below the top of the casing a ground water increase of approximately 0 3 feet since the monitoring event in l September 2002 The map of ground water contours indicates a general ground water flow ie toward the southeast • The ground water table in monitoring wells MW-2 through MW-4 was at the top of the ' screened interval, these wells should yield samples representative of shallow ground water conditions • The concentrations of TPH-g continue to decline in wells MW-3 to MW-5, TPH-g was not detected in sample MW-5 to the fourth quarter 2002 ' The benzene concentration in well MWA continues to show a decline during fourth quarte; 2002, however, the detected concentration of 50 µg/1 is above the DHS' Maximum Contaminant Level (MCL) of 1 0 µg/1 in drinking water ' MTBE was present for the second consecutive time since initiation of ground water extraction in April 2002, the MTBE concentration of 10 µg/1 exceeds the MCL of 5 0 µg/l ' for drinking water 1 ' Advanced GeoEnvironmental,Inc