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- 16 - <br />No formal stability analyses were performed on the proposed <br />sediment pond embankments because of their size and the strength of • <br />the foundation materials. Literature published by the U.S. Bureau of <br />Reclamation and our experience with similar dams indicate that <br />embarilanents less than 10 feet in height ronstructed at slopes between <br />2 and 3 horizontal to 1 vertical have factors of safety exceeding <br />those suggested for earth dam construction. <br />PERIODIC INSPF]GTION <br />We believe that a periodic visual inspection of the coal refuse <br />area should be conducted by a qualified geotechnical engineer and <br />geologist. In addition, periodic density tests should be taken in the <br />coal refuse area to determine the eortgaction densities being achieved <br />by the construction procedures. <br />u <br />LIMITATIOIZS <br />7t~is report has been prepared in accordance with generally <br />accepted soil and foundation engineering practices in this area for <br />use by the client for design purposes. The ronclusions and <br />reoormtendations submitted in this report are based upon the data <br />obtained from the exploratory holes drilled at the locations indicated <br />on the exploratory hole plan. The nature and extent of variations <br />between the exploratory holes may not become evident until excavation <br />is performed. If, during construction, soil, rode and ground water <br />oorsditions appear to be different fray those described herein, this <br />office should be advised at once so that re-evaluation of the <br />n <br />LJ <br />