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31 January 2005 <br /> AGE-NC Project No 96-0232 <br /> Page 9 of 9 <br /> • Consideration for closure utilizing fate-and-transport model techniques to demonstrate that <br /> concentrations of remaining MTBE in ground water would approach the State of California <br /> water standards (i e MCLS) From previous data, AGE has documented that MTBE <br /> concentrations in ground water at the site have been at non-detectable or near non-detectable <br /> levels Furthermore, the Banner Avenue MTBE plume that migrated onto the Flag City <br /> Chevron property is no longer being drawn by pump-treat ground water extraction <br /> operations,and has most likely began dissipating with the natural gradient towards the east- <br /> southeast <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 hydrogeologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points (i a ground water samples), and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> interpretations, opinions and recommendations contained in this report <br /> Advanced GeaEnvironmental,Inc <br />