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D04155GE <br />- The laboratory study included tests of select soil samples obtained during the field study <br />to help assess: <br />the soil strength potential (internal friction angle and cohesion) of samples tested, <br />the moisture content and density of samples tested. <br />- This report presents our geotechnical engineering slope stability analysis including <br />comments, suggestions and recommendations regarding the slope stability conditions at <br />the site including: <br />Slope stability analysis of the current slope configuration, <br />A discussion of the results of the analysis and aspects of the site which may <br />influence the slope stability, and, <br />A discussion of potential mitigation techniques for similar conditions. <br />- Our comments, suggestions and recommendations are based on the subsurface soil and <br />ground water conditions encountered during our site and laboratory studies. <br />- Our study did not include any environmental or geologic hazard issues. <br />2.0 SITE CHARACTERISTICS <br />Site chazacteristics include observed existing site conditions that may influence the geotechnical <br />engineering aspects of the proposed project and site development. <br />2.1 Site Location <br />The site is located at the north end of the abandoned town of Eureka, Colorado. A project <br />vicinity map is presented on Figure 1. <br />2.2 Site Conditions <br />The natural talus slope inclinations above the gravel pit site and in the general area range from <br />about twenty-five (25) to thirty (30) degrees with isolated areas of slopes estimated to be as steep <br />as about forty (40) degrees. The gravel mining activity included excavation of material from the <br />toe of the talus slope. As the excavation operations increased the steepness of the slope talus <br />material sloughed and raveled to the toe area from higher elevations of the slope. This process <br />generated an erosional head scarp above the mined area. Currently the head scarp is located at an <br />estimated elevation of about 150 to 200 feet above the elevation of the toe of the slope, about 100 <br />to 150 feet below the elevation of County Road 125. The author of this report frequents the area <br />for recreational activity. Based on cursory observations and general exposure to the site, it does <br />~YYtCTPI't ~I1T~Y ~.'c~SLT~CI?TtEB <br />CONSULTING GEOTECENICAL ENGINEERS AND <br />-2- MATERIALS TESTING <br />