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, <br /> ,'04 April-2002 <br /> AGE-NC Protect No 96-0235 <br />' Page 4of5 <br /> monitoring event Analytical results of water'samples collected during the first quarter of 2002 are <br />' summarized on Table 2 and 3, analytical results from previous monitoring events are summarized <br /> on Tables 4 and 5 Figures 4 and 5 illustrate the ground water contamination plumes in upper and <br />' lower ground water intervals, respectively The laboratory report (MAI Lab IDs 0202184-001 <br /> through 0202184-020), chain-of-custody forms and the laboratory QA/QC report are included in <br /> Appendix B <br /> 1 <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 southeast <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-1, MW-2, MW-5, 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 groundwater 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-11B and EW-1 at <br />' concentrations as high as 39,000µg11(EW-1) TPH-d was detected in samples collected from <br /> MW-10,-MW-11B and EW-1 at concentrations as high as 5,900 µg11 (EW-1), the TPH-d <br /> concentration detected in MW-10 was significantly lower than previous analytical results - - <br /> • BTEX compounds were detected in samples collected from MW-9, MW-10, MW-11B, <br /> MW-12B, MW-13B and EW-1, the maximum BTEX concentrations were detected in the <br /> 1 samples EW-1 Concentrations ofBTEX compounds in groundwater samples collected from <br /> the former UST cluster have remained relatively stable during the past seven quarters <br /> • MTBE was detected by EPA Method 8260 Modified in the deep-screened wells MW-9, _ <br />' MW-11B,MW-12B and MW-13B and in the shallow-screened wells MW-10,MW-13A and <br /> . EW-1 at concentrations as high as 310 �Lg/l (EW-1) <br />' Advanced GcoEnvironmental,Inc <br /> 1' <br />