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slope or greater, and no development shall occur within 100 vertical feet of a ridgeline? <br /> The slope and ridgeline development standards are each represented as a continuous <br /> horizontal line plotted on a contour map of the property. The limit of development is then <br /> determined by the more restrictive of the two standards3, i.e., the development standard <br /> that locates the limit of development on the lowest portion of the hillside. <br /> 1. Slope. <br /> 1.a. Methodologies for Determining 25-Percent Slope. <br /> Slope is the ratio of height (rise) over distance (run) for a segment of land. Page <br /> 11-21 of the 1996 Pleasanton General Plan (Attachment 4) defined "slope" as, "The <br /> ratio of the rise over the run of a segment of land, where a vertical line would have <br /> an infinite slope. For example, a vertical rise of one foot over a horizontal run of <br /> one foot (equal to 45-degree angle), has a slope of 100 percent." The 25-percent <br /> slope4 standard referenced in Measure PP and in the Pleasanton General Plan is, <br /> therefore, the ratio of a 25-foot rise over a 100-foot run, i.e., 25 percent. (Note: A <br /> 25-precent slope is equal to a 14-degree angle.) <br /> Figure 1, below, illustrates a 25-percent slope by showing a one unit rise over a <br /> four unit run. <br /> .� 100% (45°) <br /> 75% (36.87°) <br /> 4t 5096 (26,57') <br /> 40% (21,80°) <br /> 30% (10,70°) <br /> 25% Slope <br /> ::f 2096 (11,31 '} (14.00°) <br /> 10% (5.71°) 1 unit rise <br /> 0 as 1---0% (0°) <br /> —grade — angle — 4 unit run <br /> Figure 1: 25-percent slope. <br /> For the purpose of evaluating hillside development, slopes can be defined as an <br /> average value, also called a Weighted Incremental Slope (WIS), or as a specific <br /> value. These two options would affect the extent of the slope-based developable <br /> 2 Note: Measure PP does exempt from these limitations: "...housing developments of 10 or fewer housing <br /> units on a single property ...". <br /> 3 Note: Defining the development standard as the greater of two development standards is used by the <br /> Pleasanton Municipal Code (PMC) to calculate parking for medical/dental offices and for restaurants <br /> (PMC Section 18.88.030C.6.&7.). <br /> The grade of a slope is always measured perpendicular to the contour lines. <br /> 4 <br />