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1 <br />' 28 August 2000 <br /> . AGE-NC Project No. 95-0100 <br /> Page 3 of 3 <br /> Analytical results of ground.water samples are summarized in Table 2. The laboratory reports (MAI <br /> Laboratory ID 44218 to 44223), quality assurance and quality control (QA/QC) data and chain-of- <br /> custody forms are attached in Appendix B. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings of this and previous investigations, AGE concludes the following: <br />' The ground water flow direction shifted from a north flow direction in May 2000 to a <br /> northwest flow direction during this sampling event. The ground water rose approximately <br /> 0.69 feet between May and August 2000. <br /> • MTBE was only detected in monitoring wells MW-1 and MW-3. The concentrations <br /> exceeded the State of California maximum contaminant level (MCL) of 14 µg/l, however, <br /> the MTBE concentrations decreased in both wells as compared to the May 2000 results. <br />,. 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends that quarterly monitoring be continued. <br /> The next quarterly event should be scheduled for November 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 mainly <br /> upon analytical results provided by an independent laboratory. Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation were made from <br /> a limited number of available data points (i.e. ground water samples and data from monitoring <br /> wells), and subsurface conditions may vary away from these data points. No other warranty, <br />' expressed or implied, is made as to the professional recommendations contained in this report. <br /> AdvtrncedGeoLnvironment nc. + <br /> al I <br />