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<br />] <br /> <br />...r:-. <br /> <br />The Phase I investigation will incbtde several site inspections, <br /> <br />review of previous studies such as the Colorado Geological Survey <br /> <br />"Geologic Reconnaissance Report Stewart Ditch Landslide", some field <br /> <br />measurements for existing .slopes and mapping. A preliminary eva- <br /> <br />luation of the causative mechanism for the landslide will be made. <br /> <br />This will include seepage or increased groundwater levels, progressive <br /> <br />weakening of the Mancos Shale-overlying colluvium (or old landslide <br /> <br />material) interface, seepage or weakness created by the old tunnel <br /> <br />through this reach of ditch, ditch seepage and the Gunnison River <br /> <br />undercutting the slope toe. Identification of the causative mechanism <br /> <br />is vital to the process of definition of remedial measures and slope <br />stabilization. <br /> <br />Potential remedial measures will be defined based upon the above <br /> <br />and considering the current status of construction. Obviously, any <br /> <br />permanent stabilization measure must be developed with full recogni- <br /> <br />tion of work already performed. <br /> <br />Cost estimates will be developed for the one or two most <br /> <br />feasible alternatives. The results of the Phase I work will be pre- <br /> <br />sented within a brief report. This report will be utilized by both <br /> <br />the Stewart Ditch and Irrigation Co. and the Colorado Water <br /> <br />Conservation Board for the funding review .on the project. <br /> <br />II-2 <br />