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PROGRESS REPORT <br />LANDSLIDES AT MOUNT GUNNISON MINE <br />SOMERSET, COLORADO <br />FOR MERRICK AND COMPANY <br />' 1.0 INTRODUCTION <br />1.1 GENERAL <br />Merrick and Company is currently designing surface struc- <br />' tures and facilities related to a proposed ARCO underground coal <br />mine located in the town of Somerset, to the south of the North <br />,I Fork of the Gunnison River, approximately eight miles east of <br />Paonia, Colorado. <br />' Geotechnical investigations performed at the site in 1976 by <br />' ~ International Engineering Company ("Foundation Investigation Re- <br />j port, Proposed Coal Preparation Plant, Mount Gunnison Mine, Somer- <br />~~iset, Colorado", dated December 1976) indicated that an area in <br />i <br />the northern part of the property was an old landslide. Several <br />structures and facilities of the proposed mine are currently <br />1 ~Ilbeing designed within the old landslide; they include the mine <br />I~portal cut for the mine's five entries and the mine access road. <br />~,I~Additional structures may also be located within the same area. <br />I <br />GEO-HYDRO Consulting, Inc., was retained by Merrick and <br />' Company to conduct a geotechnical study of the landslide area to <br />evaluate the effects of the landslides on the proposed cons- <br />' truction. Our investigation has been conducted in several phases; <br />,this progress report presents our evaluation of the landslide <br />' urea and of the expected construction problems. <br />` 1.2 SCOPE OF THE STUDY <br />ii The scope of Phases 1 and 2 of our study was to delineate in <br />i more detail the extent and depth of the existing landslides; to <br />;evaluate their character and, if possible, to estimate the <br />;'reasons for the landslides. The study was also to assess, in <br />wo-w.oeo cwuuw ~c <br />