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~eiORRISO\-I(P!UDSEP! CO~eiPAP!Y, IP!C. <br />~> Mr. Cass Legal <br />`~ October 21, 1981 <br />Page 3 <br />rainfall, the precipitation is likely to run off the northeast portion, but <br />on the southwest portion infiltration would be expected. Therefore, as the <br />spoil pile is not contiguous with any other high ground which might affect <br />the groundwater regime, the maximum phreatic surface elevation which might <br />reasonably be expected would be some depth below the top of the southwest <br />portion of the spoil pile. As the top of this part of the pile corresponds <br />closely to the elevation of the phreatic surface required to reduce the <br />factor of safety to 1 .5, the likelihood of its occurring is believed to be <br />remote. Because of the steeper, albeit lower slopes along the southwest <br />face, if such a high phreatic surface were to occur, seepage from the slope <br />would be expected which, as previously mentioned, reportedly does not oc- <br />cur. <br />Conclusion <br />From the above, it can be seen that even in the event of the occurrence of <br />unlikely hydrologic conditions, the factor of safety of the spoil pile is <br />~ unlikely to fall below 1.5. If there are any questions concerning the con- <br />`- ~ tent of this addendum, please contact us. <br />Very truly yours, <br />Oavid A. O'Day <br />Principal Geotechnical Engineer <br />n <br />M133 <br />