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of these spurs fell within the horizontal area already encompassed within the <br /> 100-foot vertical setback (and exhibited the drainage-derived topography <br /> described above), they were not considered ridgelines. This approach eliminated <br /> from Measure PP spurs and secondary ridges subservient to the main ridgelines <br /> (see Figures 3 and 4 for examples of ridgelines and spurs). <br /> Pursuant to the Planning Commission's recommendation, staff evaluated <br /> alternative approaches to defining spurs. In general, the geomorphic processes <br /> (primarily erosion) that created spurs resulted in spur landforms that are very <br /> steeply-sloped. As seen in Attachment 6, most spurs in the Southeast Hills <br /> contain slopes greater than 25 percent. While some spurs contain small areas of <br /> lesser slopes, it would be difficult to build multiple structures in these areas (or to <br /> construct roads to access these structures) due to geotechnical concerns. In <br /> addition, because spurs usually fall steeply to the valley floor, they are largely <br /> encompassed within the 100-foot vertical ridgeline setback. For these reasons, <br /> spurs are largely excluded from substantial development by nature of Measure <br /> PP's restrictions on developing steep slopes and areas within 100 vertical feet of <br /> a ridgeline. However, an alternate method could involve establishing a length <br /> threshold beyond which spurs would be considered ridgelines and subject to <br /> Measure PP. For instance, spurs extending more than 500 feet in length from the <br /> primary ridge could be considered ridgelines and subject to Measure PP. This <br /> approach would not materially change the mapping presented in this report, <br /> which shows that the vast majority of the Southeast Hills is subject to Measure <br /> PP considerations. <br /> Figure 2: Slopes on Longview Drive <br /> Percent Slope -17-22% -12-22% -5-13% -4-7°. <br /> f. _ <br /> at' _ '�w � <br /> , \ 'iT i •k 1 .04, • '' - Avec" <br /> , , , 130 zig„,, ,it. <br /> ,.., .... 1. !t„- .. -:, , .4,:( .. <br /> itikla \ . .4014„...: .. .It. 44. , , ,,. . . <br /> ,..k, 71 <br /> i -.--ii--...:.. <br /> itp- 4, i. .. ., k..... -- d 44- ' -1*t 4 <br /> Zt:'•1 <br /> yls <br /> Page 5 of 10 <br />