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I <br /> I22 August 2000 <br /> �. AGE-NC Project No 98-0540 <br /> Page 3 of 3 <br /> Analytical results of ground water samples are summarized on Table 2 The laboratory report (MAI <br /> Laboratory ID 36212-36215) and chain-of-custody forms are Included In Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> I <br /> Based upon data collected from the site, AGE concludes the following <br /> I • The ground water adient was 0 002 ft/ft directed N 62° E and was consistent with the <br /> � t�" > <br />' gradient and flow direction from the last monitoring event <br /> • TPH-g and BTEX compounds were detected In ground water samples collected from MW-1 <br /> and MW-3, the benzene concentrations exceeded the State of California's Maximum <br /> IContaminant Level (MCL) of 1 µg/1 in both samples <br /> MTBE was not detected above laboratory reporting limits In any of the ground water samples <br /> collected and analyzed <br /> • TBA was detected at 32 ppb in the ground water sample collected from MW-1 <br /> • • The highest concentrations of dissolved petroleum hydrocarbons is in the area of the former <br /> UST <br /> O The lateral extent of dissolved petroleum hydrocarbon-Impacted ground water has not been <br /> Idelineated <br /> 5.0. RECOMMENDATIONS <br /> I Based upon data collected from the site, AGE recommends continued ground water monitoring The <br /> next quarterly monitoring event should be scheduled for September 2000 <br /> 6.0 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 e ground water samples) and subsurface conditions may <br /> ' vary away from these data points No other warranty, expressed or Implied, is made as to the <br /> professional recommendations contained In this report <br /> Advanced GeoEnvironmental,Inc <br /> I <br /> i <br />