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Grand Island Resources,LLC Page 19 <br /> Idaho Tunnel Portal—Slope Stability Analysis <br /> • Groundwater conditions <br /> • Laboratory testing data to determine the geomechanical properties of the materials comprising <br /> the slope <br /> • Shotcrete thickness distribution <br /> • Soil anchor installation details and pullout capacity <br /> This study should be updated and reassessed once additional data such as the as-built slope geometry <br /> becomes available. In other cases,the cost and effort required to refine the analyses may be more than <br /> the value provided. For example, the cost to accurately characterize the highly variable geologic <br /> conditions within the slope may be higher than the cost implications of adopting conservative <br /> assumptions, such as those provided herein. Similarly, the cost to accurately characterize and monitor <br /> the potential ground water variations would likely be higher than the cost to install horizontal drains to <br /> ensure drainage. <br /> Stability analysis of the Idaho Tunnel portal slopes was conducted by Mr. David S. Hallman, licensed as <br /> Colorado Professional Engineer(Civil)26076,as affirmed by the stamp and signature affixed below. <br /> i :0 26# 6 z? <br /> 4 -; 57/2020 <br /> t.. <br /> Applied Geologic LLC 5/7/2020 <br />