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02 March 2000 <br /> s AGE-NC Protect No 98-0452 <br /> Page 5 of 5 <br /> Laboratory ID 26440-26442) and chain-of-custody forms are included in Appendix D <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> • The ground water gradient was calculated to be 0 003 ft/ft directed N 46° E <br /> • TPH-g, TPH-d, and BTEX compounds were not detected above laboratory reporting limits <br /> in any of the ground water samples collected and analyzed <br /> • MTBE was detected at concentrations as high as 17 ppb, exceeding the State of California's <br />' action level of 13 ppb and secondary MCL of 5 ppb <br /> 6.0. RECOMMENDATIONS <br /> lieBased upon data collected from the site, AGE recommends An additional ground water monitoring <br /> event to further assess the concentrations of MTBE <br /> 7.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon field <br /> measurements and analytical results provided by an independent laboratory Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points (i a probe boring soil and ground water samples) and <br /> subsurface conditions may vary away from these data points No other warranty, expressed or <br />' implied, is made as to the professional recommendations contained in this report <br /> I <br /> • <br /> Advanced GeoEnvironmental,Inc <br />