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28 April 1999 <br />,r AGE-NC Project No 95-0137 <br /> Page 3 of 5 <br /> ground water monitoring wells over the quarter The relative ground water elevation ranged from <br /> 82 12 to 83 45 feet <br /> ' The ground water flow was directed toward north to northwest The ground water gradient was <br /> shallow on the RFS site compared to the Jimco portion of the site and was directed toward the <br /> northwest <br /> ' Historically, ground water flow direction at the site has vaned from north to northwest, consistently <br /> at a low gradient Figure 3 illustrates the contoured relative ground water elevations as measured on <br /> ' 11 February 1999 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ' TPH-g was detected in wells MW-1 though MW-8 and vapor/air-sparging wells VW-1 and VW-2 <br /> at concentrations as high as 13,900 micrograms per liter (yg/1) TPH-d was detected in same wells <br /> at concentrations up to 290,000 Mcg/1 (V W-2) <br /> Benzene was detected in the sample from wells at concentrations up to 1,500 yg/l Toluene was <br /> detected at a maximum concentration of 100 deg/1 in the ground water samples from well MW-2 <br /> ' Ethylbenzene and xylenes were detected at maximum concentration in samples collected from well <br /> MW-2 at 800 /,eg/l and 1,700 ,ugll, respectively Low concentrations (less then 6 /.cg/1) of BTEX <br /> compounds was detected in samples from wells MW-1 and MW-3 through MW-8 While moderate <br /> trange concentrations (85 yg/l to 540 yg/1) of BTEX compounds were detected in the vapor wells <br /> VW-I and VW-2 <br /> ' MTBE was detected in wells MW-1 And MW-3 at concentrations of 2 4 ,ug/L and 3 7 µg/L, <br /> respectively DIPE and TBA were detected in wells at the site at concentration up to 17 yg/L and <br /> ' 120 yg/L, respectively <br /> Analytical results from ground water samples for each monitoring event analyzed by EPA Methods <br /> ' 8015 Modified and 8020 are summarized in Table 2 Analytical results for ground water samples <br /> analyzed by EPA Method 8260 Modified are summarized in Table 3 The laboratory report (MAI <br /> Lab ID Numbers 03474 through 03485), quality assurance and quality control (QA/QC) and chain- <br /> of-custody are included in Appendix B <br /> ' 40 CONCLUSIONS <br /> Based upon data collected during the February 1999 monitoring event, AGE concludes <br /> A(hanced GeoEnvaronmcnlal,Inc <br />