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Policies should also be considered regarding from whereto commence measurements (e.g. toe ofhill / toe of slope); whether applicants can submit information to supplement the GIS data (by field survey or historic aerial photos); how irregular slopes in land features will be handled (erg. creek banks); over what distance to measure the slope; and whether consideration wiU be given to grading which altered the natural slope. 5.5 Did the 1986 General Plan include a reference about 25•h slope, and, if so, under what circumstances was it removed in the 1996 General Plan? The 1986 General Plan did include a reference to a 25% slope. In the Land Use Element, in the Areas of Special Concern section, the Public Health 8t Safety open space designation was "planned for 3300 acres of the Ridge greater than 670 feet in elevation or greater than 25% slope." It appears that na of wh~reh were incorporated into the General of the adoption of Measure F (the pro Plan) in the interim period. The 1996 General Plan still includes references to 25% slopes: in thane hlandslides, Element, which provides that "Development is restricted in areas pro slope instability, or with slopes of 25% or greater" and Policy 13.1 of the Conservation and Open Space Element, limiting development to one unit on properties with no areas of less than 25% slope (see 4.2, above). 5.6 Does the 25°/. slope have any supporting data or engineering analysis? In arriving at the 25°/. slope, staff did consider the existing slopes on Pleasanton ridge, the slopes of then existing hillside developments and their access roads, and slope limitations from other communities.x~ 5.7 3hodd restrlctlons apply only to structures on 23°/. slope, or to all grading on land with ZS•/G slopes? The Initiative states that "No grading to construct residential or commercial sfntchtres shall occur on hillside slope 25% or greater.,, Aa discussed earlier is thin report, it is not clear from this language whether this would prohibit: (i) grading for any roads on hillside slopes of 25% or greater; (ii) Grading for any roads on hillside slopes of 25% or greater where sttvctutes (i.e., six feet or higher retaining walls) are required; or (iii) prohibit tag for roads to reach areas with hillside slopes 25% or greater. City policy has been that roads generally not exceed 15°/6 slope, but roads with a 15% finished grade can be constructed oa land with a greater natural slope through grading and ttu of retaining walls. ~' See 19E6 General Plea, pap ri-9. '• See 1996 General Plm, pap V-4. r Baud ao coaveruadoa witb Brim Svritt, former Director o[ Pluming and Community Development. L4