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Figure 4: Illustration of Ridgelines <br /> All considered ridgelines per <br /> currently proposed method <br /> 41110000.itishoo. - -it <br /> - yt ;l4 <br /> i' 4400,1, , . - <br /> 4. Identify 100-Foot Vertical Setback. Measure PP prohibits development within 100 <br /> vertical feet of a ridgeline. For the mapping presented in this report, this setback <br /> is defined as the horizontal line measured 100 vertical feet below the ridgeline, <br /> which is then plotted on a topographic map. Note that in the Southeast Hills, <br /> there are many closely-spaced ridgelines, meaning that some of the ridges have <br /> overlapping 100-foot vertical setbacks. Similar to the rule regarding termination of <br /> a ridgeline, vertical setbacks also terminate at the boundary of the mapping area <br /> for the Southeast Hills. For purposes of mapping clarity, these 100-foot vertical <br /> setbacks were combined, allowing for a contiguous polygon setback area around <br /> the ridgelines in the Southeast Hills project area. Attachment 7 is the resultant <br /> map of ridgelines and 100-foot vertical setbacks using the methodology <br /> described above. <br /> 5. Field-verify. After undertaking preliminary mapping of slopes, ridgelines, and <br /> vertical setbacks, staff visited and hiked through the Southeast Hills, generally <br /> focusing on the northern and western reaches closest to existing development. <br /> The primary purpose of the visit was to better understand the distinction between <br /> ridges and spurs on the landscape, and to confirm that all obvious ridges were <br /> identified as such on the mapping. After the field visit, staff made relatively minor <br /> adjustments to the mapping to better reflect the observed landforms. The final <br /> composite map, included as Attachment 8, shows areas protected by Measure <br /> PP (areas that contain slopes over 25 percent and/or are within the 100-foot <br />