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<br /> - 3 - <br /> <br />' ARCO Coal Company provided us with detailed interpret- <br /> ations of the coal seam position in the form of structure <br />' maps of the top of the F seam and in the form of structural <br /> stratigraphic sections in the vicinity of the upper bench. <br /> Detailed structural maps were available from the vicinity of <br />' the F seam outcrop directly below the proposed waste rock <br /> ile. <br />~ <br /> _ <br /> Boring logs of the exploratory borings located within <br />' the area of concern were made available to us; they were re- <br /> viewed and their data used for the purpose of our study. <br /> Several logs of borings drilled by International Engineering <br /> Company, by GEO-HYDRO, and by Chen fi Associates within the <br /> area were also reviewed. <br />1 With the help of this information, appropriate geo- <br />d <br />l <br />i <br />l <br />i <br />f <br /> ons necessary <br />or our purpose were interprete <br />og <br />ca <br />sect <br /> and are presented in this report. <br /> As a next step, an attempt has been made to explain the <br />r origin of the landslides. The-landslides on the site were <br /> studied and delineated previously by International Engineer- <br />1 ing Company, Inc. and GEO-HYDRO Consulting, Inc. More atten- <br /> tion has been paid to the landslide character immediately <br /> below the proposed waste rock pile so that the influence of <br /> the pile on the stability of the area could be properly <br /> assessed. <br /> Using the data available, a set of stability analyses <br /> has been performed so that~the influence of the future waste <br /> rock pile could be evaluated in preliminary terms. The results <br /> of these analyses support the conclusions and recommendations <br /> of this report. At the same time, further studies, which are <br />1 <br />cto*roao coKw~m+c. iNC. <br />