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15 April 2006 AGE-NC Project No 95-0142 Page 5 of 5 TK1-90,at a depth interval between 10 and 40 feet bsg,ground water remediation efforts are directed in this area, soil vapor extraction has been discontinued at the site • The ground water pump-and-treat system was in operation during the fourth quarter 2005 and the first quarter 2006, except for short periods for system repairs Approximately 946,735 gallons of water were processed, AGE estimates that an average of 4,931 gallons of water were discharged per day during this time • Based on the amount of ground water processed and laboratory analytical results, approximately 100 9 lbs of TPH-g and 13 3 lbs of benzene were removed from the extracted ground water during the fourth quarter 2005 and the first quarter 2006 To date, a total of approximately 23 8 lbs of TPH-g and 3 3 75 lbs of benzene have been extracted from ground water i 4.0. RECOMMENDATIONS Based upon the results of the remediation activities to date, AGE recommends o Continuation of ground water remediation with a possible addition of extraction vapor wells VW-2, VW-3 and VW-4 • Continuation of the quarterly ground water monitoring program 5.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based mainly upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (e g ground water samples), and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report Advanced GeoEnvironmental,Inc