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1 22 July 2002 <br /> AGE-NC Project No 96-0235 <br />' Page 4of5 <br /> (MW-11B) Concentrations of DIPE, ETBE, TAME and EDB were not detected above laboratory <br />' reporting limits in any of the water samples collected during the May 2002 monitoring event <br /> Analytical results of water samples collected during the second quarter of 2002 are summanzed on <br />' Table 2 and 3, analytical results from previous monitoring events are summarized on Tables 4 and <br /> 5 Figures 4 and 5 illustrate the groundwater contamination plumes in upper and lower groundwater <br /> intervals, respectively The laboratory report (MAI Lab IDs 0205399-001 through 0205399-020), <br />' chain-of-custody forms and the laboratory QA/QC report are included in Appendix B <br /> 4 0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the former UST No 3 area;AGE finds <br />' • Ground water flow 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 />' northeast to the west - <br /> • TPH-g,TPH-d and BTEX compounds were detected in ground water samples collected from <br /> MW-1 and MW-2, TPH-g and benzene were detected in the sample from EW-2 1,2-DCA <br />'• was detected in ground water samples collected from MW-2, MW-5, MW-6A, MW-6B, <br /> MW-7 and EW-2 The petroleum-impacted ground water plume has remained relatively <br /> 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 and EW�1 at concentrations as high <br /> • as 31,000 pg/l(EW-1) TPH-d was detected in samples collected from MW-9,MW-10,MW- <br /> 11 B <br /> W- <br /> 11B and EW-1 at concentrations as high as 5,900 gg/l (EW-1) <br />_ ___ _ _ __,_•--BTEX compounds were-detected in samples, collected from MW-10 and_EW=l,'_the <br /> maximum BTEX concentrations were detected in the sample from EW_I'Concentrations of <br /> t BTEX compounds in ground water samples collected from the former UST cluster have <br /> remained relatively stable during the past"eight quarters <br />' MTBE was detected by EPA Method 8260 in the deep-screened wells MW-9, MW-11B, <br /> MW-12B and MW-13B and in the shallow-screened wells MW-10, MW-13A and EW-1 at <br />' concentrations as high as 420 gg/l (EW-1) ; <br /> • The most impacted ground water appears to be centered around EW-1 and MW-10 The <br /> • deeper ground water appeared less intensely impacted than shallow ground water <br />' Advanced GeoEnviron mental,Inc <br />