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<br />1 - 2 - <br />1 slides on the proposed surface construction. No attempt was <br /> made, however, to evaluate the influence of the future waste <br /> rock pile on the stability of the area. <br /> In this report, the influence of the future waste rock <br />' pile on the existing landslides in the area and the potential <br /> for the development of new landslides will be discussed; a <br /> preliminary evaluation of stability of the area below the <br /> waste rock pile will be made. <br /> 1.2 PURPOSE OF STUDY <br />' The purpose of our study was to collect any pertinent <br />' geological, hydrological, and geotechnical information avail- <br /> able within the area of concern. With the help of this infor- <br /> oration, a preliminary assessment of the stability of the area <br /> and of the influence of the future waste rock pile was to be <br /> made. <br /> 1.3 METHOD OF STUDY <br /> <br /> A substantial amount of information on the geology and <br />' hydrology of the area is available from previous studies. Data <br /> on the geologic conditions were obtained mostly from the ex- <br /> ploration drilling performed earlier by ARCO. ARCO drilled a <br /> number of exploratory borings on the property; some of them <br /> were located within the area of the upper bench. All these <br /> borings penetrated the F coal seam and they enable a fairly <br /> accurate interpretation of the coal seam location and of the <br /> character of the rock immediately below the seam and between <br /> the surface and the coal seam. A few additional borings <br />ill <br />b <br />h <br />d f <br />i <br />t <br />d <br />d <br />h <br />f <br />h <br />l <br />h <br /> r <br />enc <br />n <br />er- <br />e <br />sout <br />o <br />t <br />e upper <br />were a <br />so use <br />or t <br />e <br /> pretation of the geologic conditions. <br /> <br />' <br /> cEO~wnocoww~mw.iNC. <br />