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ground surface.The surrounding parcels are developed and further development around the <br /> property is not likely. Significant changes to current surface water runoff are not anticipated. <br /> The City of Pueblo reviews drainage reports prior to issuing permits for new developments. <br /> The southwest corner of the mine will daylight and it is unlikely that groundwater will <br /> develop in the proposed mine slopes. <br /> Section A consists of an east/west trending cross section drawn through the existing <br /> highwall, N. La Crosse Ave, existing utilities, and an existing home on the east side of the <br /> property. <br /> Section B consists of an east/west trending cross section drawn through the proposed 4:1 <br /> slope along the east side of the project, La Crosse Ave, utilities, and an existing home on the <br /> east side of the property. <br /> Section C consists of an east/west trending cross section drawn through the proposed 4:1 <br /> slope along the east side of the project, La Crosse Ave, utilities, and an existing home on the <br /> east side of the property. <br /> Section D consists of a north/south trending cross section drawn through two existing <br /> homes, Ruppel Street, and the proposed 3:1 slope on the north side of the property. <br /> Section E consists of north/south trending cross section drawn through a commercial <br /> building, parking lot, utilities, and the proposed 3:1 slope on the north side of the property. <br /> Section F consists of east/west trending cross section drawn through Hudson Avenue, <br /> utilities, and the proposed 3:1 slope on the west side of the property. <br /> Sections and analysis were not completed for areas where structures are located further <br /> than 200-feet from the permit boundary. <br /> Stability analysis cross-section elevations were estimated from 1-foot topographic contours <br /> derived using Plex from Google Earth. The cross section is shown in Drawing SS-1. <br /> 3. Slope Stability Analysis <br /> The slope stability analysis was conducted using SLOPE/W (2016), a computer-modeling <br /> program by GeoStudio. SLOPE/W uses the limit equilibrium theory to compute a factor of <br /> safety on earth and rock slopes. It can use a variety of methods to compute the factor of <br /> safety of a slope while analyzing complex geometry, stratigraphy, and loading conditions. <br /> The limit equilibrium method is usually carried out by establishing a grid and factors of safety <br /> are computed for concentric arcs at each point in the grid. When the software is finished <br /> computing the factors of safety along each arc,the lowest overall factor of safety is reported. <br /> The arc corresponding to this factor of safety is called the potential failure surface. <br /> 20-8315—Native / Pierre Mine 12/10/2020 4:28 AM <br />