Agenda Packet 11-26-18 Work Session

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CLEAR & OBJECTIVE HOUSING: APPROVAL C RITERIA UPDATE November 13, 2018 DRAFT Preferred Concepts Report: Significant Issues Page 27 of 59 impacts and mitigation requirements related to slope stability in the context of road layout and lot locations. (Option D)  This issue is one of six related to the clear and objective criteria for planned unit development that contribute to limiting development feasibility of many sites. The cumulative effect of these six requirements is particularly limiting for those properties subject to the South Hills Study and additional criteria at EC 9.8325(12). The six criteria include the 30-foot buffer, 20% slope grading limitation, one-acre accessible open space, South Hills Study limitation over 900 feet, 300-foot ridgeline setback, and 40% common open space and clustering. (See related Issues COS-03, COS-04, COS-05, COS-06 and COS-07) A provision based on a particular slope (such as 20%, or 30%) does not account for other relevant factors such as historic landslide information, depth and type of soil, soil moisture and drainage characteristics. These risk factors may actually limit development on less steep slopes; therefore the existing prohibition is likely ineffective as well as inefficient—it limits development where it may be feasible and may not address other relevant risks. Stakeholder support was strongest for D, which would require site specific analysis for each development under the geotechnical requirements . This option has the greatest potential to ensure appropriate siting, construction, and development practices are used to mitigate potential risks of slope failure. Minor revisions proposed under COS-13 (Geotechnical Requirement) will increase its effectiveness by adding additional risk factors and clarifying that the certification from the licensed engineer must address proposed lot and road locations. November 26, 2018, Work Session – Item 2