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r <br /> 23 May 2001 ' <br /> AGE-NC Project No 95-0144 2 <br /> Page 7 of 8 <br /> s <br /> i '` • The plume of ground water impacted by TPH-d is larger than the TPH-g plume, extending <br /> just south of the former UST No 8 pit and north of MW-20 <br /> ' Most impacted soil was successfully removed from the former UST No 1 site; one <br /> excavation floor sample and one sidewall sample contained low concentrations of various <br /> hydrocarbons <br /> • *MTBE was not detected in ground water samples collected from the site Based on its <br /> sporadic detections and low concentrations, the impact of MTBE on the site is minimal <br /> • Nutrient concentrations detected m the samples collected from MW-21A and MW-21B <br /> appear to be suitable for microbiological degradation of hydrocarbons Nutrient <br /> concentrations have remained stable since the February 2000 physicochemical analysis ` <br /> • Bioenumeration analyses indicate that microbial degradation of hydrocarbons in ground <br /> water is occurring in both the upper and lower intervals During the February 2000 analysis <br /> ' microbial degradation was only occurring in ground water below the clay layer According <br /> to the April 2001 AKK report, ground water from both wells appears to be,undergoing a Y <br /> degree of natural attenuation _ <br /> 10 <br /> 5.0. RECOMMENDATIONS <br /> Based upon data obtained during the first quarter of 2001 and previous sampling events, AGE <br /> 1 recommends <br /> s ` <br /> • Continued quarterly monitonng of the site The next quarterly monitoring event should be <br /> ' scheduled for May 2001, concurrent with monitoring at the Van Buren site In accordance <br /> with the revised monitoring schedule, all on-site monitoring wells will be sampled at that <br /> time <br /> ' Completion of the scope of work proposed in AGE's Remedial ActionlFeaszbzlty Pilot Tests r` <br /> Work Plan, dated 10 February 2000 and approved by the PHS-EHD Work to be completed <br /> includes an eight-hour pump test and disposal of hydrocarbon-impacted soil <br /> r f <br /> r <br /> ' 6.0. LMTATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing iii this or similar localities The findings were based mainly <br /> . upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site have been made from a limited number of available data points (i e ground <br /> Advanced GeoEnvironmental,Inc <br />