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6.4.19 ~HIBIT S -Permanent Man-Made S~ctures The mining operation will not adversely affect the stability of any significant, valuable or pernanent man-made structures located within two hundred (200) feet of the affected land. The permanent man-made structures located within or adjacent [o a line drawn two hundred (200) feet from the affected land aze: The Gurley Ditch, an irrigation ditch that defines the eastern boundary of the grave] pit and is crossed twice by the gravel pit access road.. 2. The San Miguel Power Association 69 kV Transmission line that crosses the gravel pit area. 3. The Redvale Road, a county road. All of these structures are depicted on the mining plan map. The mining plan for [he gravel pit has been designed [o leave 200 foot buffers between the disturbance created by the pit and both the Redvale Road and the Gurley Ditch. These 200 foot buffers may be further evaluated. An agreement to install a 72" culvert and create a crossing of the ditch for the access road to the Phase I of the gravel pit is included in Exhibit N. The gravel pit is designed in accordance with design standards supplied by San Miguel Power Association for earthmoving adjacent to their power poles and vertical clearance required under "Open supply conductors, over 750 V to 22kV: ungrounded guys exposed to 750 V to 22 kV" where "Roads, streets, and other areas subject to truck traffic" are expected to occur. These standards, as adjusted for elevation and current, require the operator to maintain vertical clearance (as measured from the ground) of 22.8 feet or 23 feet. Additionally these standards require the operator to leave a 20 foot diameter of undisturbed earth around the power poles of a transmission line, with slopes no greater than 2h:ly. ZTaken from PART 2. SAFETY RULES FOR OVERHEAD LINES, Table 232-1, Titled Vertical Clearance of Wires, Conductors, and Cables Above Ground, Roadway, Rail or Water Surfaces. S-1