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Grand Island Resources, LLC Page 19 <br />Idaho Tunnel Portal – Slope Stability Analysis <br />Applied GeoLogic LLC 5/7/2020 <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 />5/7/2020