01 - Laserfiche WebLink

minor land forms, such as a 25-percent slope "bump" surrounded by less-than- 25-percent slopes, will make slope analyses simpler. • Option Three: Ten-foot contour intervals. Ten-foot contour intervals would provide the least detail of the three options as to slope variation and land form detail and could allow grading over these topographic features. The ten-foot contour interval will be lacking in the detail of the two-foot or five-foot contour intervals thereby increasing the complexity of slope analyses. Staff Recommendation: Option One. All of these options will require discretionary review of slope maps coupled with field visits to evaluate the significance of land features — isolated and/or insignificant land features are not considered as triggering the 25-percent slope — and the application of Measure PP to them. Based on City experience in the review of slope maps from the entitlement stage to the construction stage and due to the sensitivity to this issue among some in this community, staff recommends that the more conservative and detailed two-foot contour intervals be used. 2. Definition of Ridge and Ridgeline and the 100-Foot Setback. Measure PP prohibits development within 100 vertical feet of a ridgeline. The ridgeline setback could be defined as the horizontal ground line, measured 100- feet below the ridgeline and then plotted on the contour map or topographic map of the site. The horizontal distance of the ridgeline setback from the ridgeline will vary based on the slope of the hillside. Similar to the 25-percent slope line, the ridgeline setback is a continuous ground line. Figure 4, on the following page, is an example of the 100-foot ridgeline setback for a general cross section of a hillside; it is not intended to represent an actual hillside in Pleasanton. 8