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I <br /> I <br /> 03 October 2000 <br /> AGE-NC Project No 95-0144 <br /> Page 4 of 5 <br /> • Ground water elevation decreased approximately 0 8 feet at the site since the previous <br /> ground water monitoring event Ground water remained above the screened interval in nine <br /> of the shallow wells sampled during the current quarter Ground water elevations in wells <br /> completed beneath the clay layer were lower than in wells completed within first ground <br /> water <br /> ' Petroleum hydrocarbons were detected in five of the eleven wells sampled during the August <br /> 2000 monitoring event The average concentration of TPH-d has increased between the May <br /> 2000 and August 2000 monitoring events Average concentrations of TPH-g and TPH-mo <br /> ' have decreased between May 2000 and August 2000 <br /> • The plume of ground water impacted by TPH-g appears to be confined to the area centered <br /> on the former UST No 8 pit, and does not extend more than 40 feet southwest of the pit or <br /> ' more than 50 feet northeast of the pit <br /> • The plume of ground water impacted by TPH-d is larger than the TPH-g plume, extending <br /> ' at least 40 feet to the southwest of the former UST No 8 pit to MW-19 and more than 50 feet <br /> northeast to MW-20 The plume does not appear to extend more than 100 feet northwest to <br /> . MW-13 , <br /> ' • MTBE was detected in ground water samples from monitoring wells MW-2, MW--4, MW- <br /> 13, <br /> W13, MW 19A and MW19B at concentrations ranging from 1 1 µg11 to 1 5 µg/1 MTBE was <br /> ' not detected in samples from the other sic wells monitored in August 2000 The limited <br /> distribution and low concentrations of MTBE indicate that the impact of MTBE on the site <br /> is minimal <br /> ' • TPH-g and TPH-d contamination detected in soil samples recovered from soil probe borings <br /> advanced near MW-12 during the previous quarter do not appear to have Impacted ground <br /> ' water <br /> ' S.O. RECOMMENDATIONS <br /> Based upon data obtained during the second quarter of 2000 and previous sampling events, AGE <br /> recommends <br /> • Continued quarterly monitoring of the site The next quarterly monitoring event should be <br /> scheduled for November 2000, concurrent with monitoring at the Van Buren site- In <br /> accordance with the revised monitoring schedule, monitoring wells MW-1, MW-2, MW-4, <br /> MW-13, MW-19A &B, MW-20A&B and MW-21A& B will be sampled at that time <br /> 1 , <br /> ' Advanced GeoEnvironmental Inc <br /> I , <br />