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t 4 <br /> ' 20 March 2002 <br /> AGE-NC Project No 95-0144 <br /> Page 6of7 <br /> 5.0. SUMMARYXONCLUSIONS <br /> I <br /> Based upon data collected during the ground water monitoring event, AGE concludes <br /> ' The average ground water elevation increased approximately 0 80 feet at the site since the <br /> previous ground water monitoring event Ground water remained above the screened Interval <br /> I in seven of the shallow wells sampled during the first quarter of 2002 Ground water <br /> elevations in wells completed beneath the clay layer(approximately 35 to 45 feet bsg)were <br /> between 141 to 1 68 feet lower than in wells completed within first ground water <br /> ' Petroleum hydrocarbons were detected in six of the ten wells sampled during the February <br /> 2002 monitoring event Concentrations of TPH-g, TPH-d and TPH-mo have remained <br /> ' relatively stable since the August 2001 monitoring event <br /> • TPH-g and TPH-d were detected in wells MW-21A and MW-21B located within the former <br /> UST No 8 pit The plume of ground water impacted by TPH-d is larger than the TPH-g <br /> plume, extending north of MW-19 and north of MW-20 <br /> • Low concentrations of MTBE were detected in ground water samples collected from <br /> lie <br /> monitoring wells MW-2,MW-4,MW-13,MW-19A,MW-19B and MW-21B located north <br /> of the former UST No 8 pit Based on its sporadic detections and low concentrations, the <br /> impact of MTBE on the site is believed to be minimal The concentrations of MTBE detected <br /> ' during the February 2002 monitoring event were below the DHS Secondary Maximum <br /> Contaminant Level of 5 Ag/1 <br /> 6.0. RECOMMENDATIONS <br /> Based upon data obtained during the first quarter of 2002 and previous sampling events, AGE <br /> recommends continued quarterly monitoring of the site The next quarterly monitoring event should <br /> be scheduled for May 2002, concurrent with monitoring at the former Chase Chevrolet Van Buren <br /> site <br /> 7.0. LIMITATIONS <br /> ' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in 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 /> water monitoring wells, ground water samples) and subsurface conditions may vary through time <br /> ' Advanced GcoEnvtronmental,Inc <br />