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i i03 November 2000 • AGE-NC Project No 98-0511 iPage 3 of 3 i Analytical results of ground water samples are summarized on Table 2 The laboratory report(MAI Laboratory ID 48031-48034) and chain-of-custody forms are included In Appendix B i4.0. SUMMARY AND CONCLUSIONS iBased upon data collected from the site, AGE concludes the following i • The ground water gradient was calculated to be 0 0036 ft/ft directed N 45'W Much higher concentrations of TPH-g, as well as toluene, ethylbenzene and xylenes were detected In MW-1 than in previous quarterly monitorings,TPH-g concentrations were twice i as high and xylenes were three tunes as much as previous monitonngs TPH-g also was detected in MW-3 for the first time i • Petroleum hydrocarbons were not detected m MW-2 and MW-4 • MTBE was detected at concentrations as high as 22 µg/1 in monitoring well MW-3, • exceeding both the State of California's secondary MCL of 5 pg/1 and the State of iCalifornia's action level of 13 µg/1 a i5.0. RECOMMENDATIONS i Based upon data collected from the site,AGE recommends continued ground water monitoring The next quarterly monitoring event should be scheduled for December 2000 i6.0. LIMITATIONS iOur professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based upon field i measurements and analytical results provided by an independent laboratory Evaluations of the geologlc/hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points(1 a ground water samples)and subsurface conditions may i vary away from these data points No other warranty, expressed or implied, is made as to the professional recommendations contained in this report i r i Advanced GeoEnvironmental,Inc I