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MORRISON-KNUDSEN COMPANY,INC. i <br /> the Bear Creek subdrainage which is also a perennial steam. <br /> i .' The present refuse pile is a non-impounding, sidehill type. Site in- <br /> spection by M-K engineers revealed no visible sign of seepage from the <br /> refuse pile which appeared to be almost dry. For the purpose of this study <br /> it had been assumed that no pore pressure build-up exists in the refuse pile. <br /> In the event of selection of a cross-valley site for refuse disposal , site <br /> rainfall and stream flow' data will be needed for a final design. <br /> 1 .1.6 Refuse Pile Configuration <br /> In order to determine the capacity and the stability of the present <br /> refuse pile, the approximate volume and configuration of the pile has been <br /> determined. As no large scale topographical map of the original ground <br /> surface under the present refuse area was available, USGS maps (1 "=2000' <br /> and 40' contour interval ) were used for drawing vertical sections through <br /> c• the refuse pile. As a result, the volumetrics are approximations . A num- <br /> ber of vertical sections were drawn normal to the slope face for use in <br /> stability analyses. The refuse pile was estimated to be about 180 feet <br /> at its highest point and standing at an angle of approximately 380 at its <br /> steepest slope. <br /> The volume of the present refuse pile, as shown on the map supplied <br /> by Mid-Continent, was estimated to be about 1 .5 million cubic yards. <br /> 1 .3.7 Classification of the Refuse Pile <br /> The present refuse pile was reportedly started in 1961 and is a low <br /> hazard non-impounding type. The proposed sites for future expansion are: <br /> a) Non-impounding, cross-ridge type and - <br /> b) Non-impounding, cross-valley type <br />;i <br /> 1-8 <br />