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Case D -Existing overhead electric transmission line to the west. The mining <br />operation is adjacent to an existing overhead electric transmission line in this area. The <br />proposed setback for mining is 55 feet from the transmission line. The mining depth was <br />assumed to be 29 feet in this area based on bore log information in the Terracon report <br />and addendum. The mining side slope in this location will be near vertical for the bottom <br />half of the slope and 0.5h:1v for the top half of the slope. <br />Case E -Existing irrigation ditch, existing overhead electric transmission line to <br />the east. The mining operation is adjacent to an existing irrigation ditch and an existing <br />overhead electric transmission line in this area. The proposed setback for mining is 55 <br />feet from the west bank of the ditch and 85 feet from the property line. The mining depth <br />was assumed to be 30 feet in this area based on bore log information in the Terracon <br />report and addendum. The mining side slope in this location will be near vertical for the <br />bottom half of the slope and 0.5h:7 v for the top half of the slope. <br />Case F -Existing gas pipeline, existing overhead electric transmission fine to the <br />south. The mining operation is adjacent to an existing gas pipeline and an existing <br />overhead electric transmission line in this area. The proposed setback for mining is 55 <br />feet from the existing gas pipeline. The mining depth was assumed to be 30 feet in this <br />area based on bore log information in the Terracon report and addendum. The mining <br />side slope in this location will be near vertical for the bottom half of the slope and 0.5h:1v <br />for the top half of the slope. <br />Case G -Existing overhead electric transmission line to the west. The mining <br />operation is adjacent to an existing overhead electric transmission line in this area. The <br />proposed setback for mining is 58 feet from the transmission line and 60 feet from the <br />property line. The mining depth was assumed to be 30 feet in this area based on bore <br />log information in the Terracon report and addendum. The mining side slope in this <br />location will be near vertical for the bottom half of the slope and 0.5h:1v for the top half <br />of the slope. <br />Case H -Existing irrigation ditch to the west. The mining operation is adjacent to an <br />existing irrigation ditch in this area. The proposed setback for mining is 58 feet from the <br />east bank of the irrigation ditch. The mining depth was assumed to be 31 in this area <br />based on bore log information in the Terracon report and addendum. The mining side <br />slope in this location will be near vertical for the bottom half of the slope and 0.5h:1v for <br />the top half of the slope. <br />The cross-sections located in Appendix B show the proposed mining slope geometry, estimated <br />phreatic surface, location of the man made structures relative to the mining slope, and location <br />of the most critical slope failure surface for each case. <br />Rankin Property Gravel Pft Expansion Project <br />Sbpe Stabrlrty Analysis <br />Page 3 <br />