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Chevron U.S.A. <br /> Page 33 <br /> o Surface contamination observed by Dames& Moore immediately around <br /> monitoring well MW-2, within the Christy-box and within the well <br /> casing, lead to the conclusion that the contamination reported during <br /> 1988 and 1989 in monitoring well MW-2 was apparently due to external <br /> contamination entering the well through the Christy-box. <br /> 12.0 LIMITATIONS <br /> - The conclusions presented in this report are professional opinions based on the <br /> data described in this report. They are intended only for the purpose, site location <br /> and project indicated. The conclusions and opinions presented in this report are <br /> based on the assumption that subsurface conditions do not deviate from those observed <br /> during our study,as described in this report. <br /> It should be recognized that this study was not intended to be a definitive study <br /> _. of contamination at the site. The conclusions present in this report are based on <br /> those locations sampled and tested. <br /> The opinions presented herein apply to site conditions existing at the time of <br /> our study. They cannot necessarily apply to site changes made of which this office is <br /> not aware and has not had opportunity to evaluate. Changes in the conditions of the <br /> subject property can occur with time, because of the natural processes or the works of <br /> man, on the subject site or on adjacent properties. Changes in applicable engineering <br /> or regulatory standards can also occur as the result of legislation or from the <br /> broadening of knowledge. Accordingly the findings of this report may be invalidated, <br /> wholly or in part,by changes beyond Dames&Moore's control. <br /> 16000-206-044 - - <br />