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-43- <br />The analyses indicate that the most critical loading condition <br />for the development rock pile is the infinite slope analogy with a <br />shallow surface failure occurring. The face of the rock pile and the <br />foundation materials are stable under all the analyzed loading <br />conditions, including earthquake coefficients of 0.05 and 0.1 which <br />represent dynamic loadings which are larger than can reasonably be <br />expected at this site. <br />Because of the embankment size and the strength of the foundation <br />materials, no formal stability analyses were performed on the berms <br />which will be constructed around the acid storage tanks. Literature <br />published by the U.S. Bureau of Reclamation and our experience with <br />similar small dikes indicates that providing they are constructed <br />according to the criteria discussed in Berms and Liners, they will <br />have factors of safety exceeding those suggested for earth dam <br />construction. <br />SITE DRAINAGE <br />Surface drainage ditches are recommended upslope of the vat <br />leaching facilities and the waste rods storage pile in order tc <br />divert surface runoffs around the plant area. <br />Considering the meteorology of the region and the size of the <br />i.nages, the probable maximum precipitation events will most likely <br />associated with thunderstorm activity. Probable maximum thunder - <br />_ormS for a 1 hour rainfall west of the 105th Meridian are presented <br />,i the Bureau of Reclamation (1974). According to this publication, <br />probable maximum thunderstorm in the vicinity of the JD-5 lease <br />