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r n <br /> r � <br /> t <br /> r ' <br /> c I + <br /> I <br /> 26 December 2001 <br /> AGE-NC Project No 96-0235 <br /> Page 4'of 5 h <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> 4 Based on the data collected from the former UST No 3 area, AGE finds a - <br /> I • Ground water flaw within the lower monitored interval appears to have been toward the � <br /> south-southwest, ground water flow in the upper interval was flowing radially toward the <br />' east-southeast <br /> • TPH-g,TPH-d and BTEX compounds were detected in groundwater samples collected from <br />' MW-1, MW-2 and EW-2 1,2-DCA was detected in ground water samples collected from <br /> wells MW-1,MW-2,MW-5, MW-6A, MW-6B, MW-7 and EW-2 The petroleum-impacted <br /> ground water plunie has remained relatively stable ` <br />' • MTBE was not detected in any of the ground water samples collected from the former UST <br /> No 3 excavation area <br /> • The lateral extent of the plume of impacted ground water is not well defined to the south <br /> •' Based on the data collected from the former UST cluster area, AGE finds <br /> • TPH-g was detected in samples collected from MW-10, MW-11 B, MW-12B, MW 13B and <br />' <br /> EW-1 at concentrations as high as 53,000 µg/1 TPH-d'was detected in samples collected <br /> from MW-9, MW-10, MW-11B and EW-1 at concentrations as high as 36,000 µg/1 +` <br />' • BTEX compounds were detected In samples collected from MW-9, MW-10, MW-11B, <br /> MW-12B, MW-13B and EW-1 Benzene was detected at concentrations as high as 2,000 <br /> µg/l Concentrations of BTEX compounds in ground water samples collected from the <br />' former UST cluster have remained relatively stable during the past six quarters <br /> • MTBE was detected by EPA Method 8260 Modified in the lower screened wells MW-9, <br /> MW-11B, MW-12B and MW-13B and in shallow wells MW-10, MW-13A and EW-1 at <br />' concentrations as high as 340 µg/1 <br /> I r <br /> • The most impacted groundwater appears to be centered around-EW-1 and MW-10, deeper <br />' ground water is less intensely impacted The lateral extent of the contamination plume in „ <br /> ground water is not well defined toward the east and south area of the former UST cluster <br /> I <br /> • Ground water flow in the area of the former UST cluster was generally toward the'east- <br /> southeast in the lower monitored interval and in the upper interval <br /> 1 x <br /> , <br /> 1 5 1 y I <br /> Advanced GeoEnvironmental,Inc <br /> 1 I <br />