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as to prevent erosion and possible slope failure, shall be approved by the Development Services Division. (2) The method of drainage of terraces for temporary slopes at setback lines shall be submitted to Development Services division for approval. 3). Slope Stability Factors of Safety. When required in this Title to provide site- specific geologic and engineering slope stability analysis, the following minimum slope stability factors of safety shall apply: (1) A minimum factor of safety of 1.5 against static deep seated failure. (2) A minimum factor of safety of 1.5 against static surficial failure. (3) A minimum factor of safety of 1.1 against seismic failure. 4). Temporary Cut Slopes at Setback Lines. Temporary cut slopes (i.e., for limited periods of time, slopes that are in the process of extraction prior to being backfilled) at setback lines shall not exceed one (1) foot horizontal to one (1) foot vertical, except that temporary cut slopes at setback lines to a maximum of one half (1/2) of a foot horizontal to one (1) foot vertical may be maintained if site-specific geologic and engineering analysis demonstrate through a slope stability analysis that the proposed temporary cut slopes will have a minimum slope stability factor of safety as required in Section 9-1415.3(k)(4). However, in the event that there are existing structures on the adjacent property (or the immediate potential for structures on the adjacent property), the excavation shall at not time be closer to the property line than a line projected on a slope of one (1) to one (1)from the property line to the toe of slope. 5). Final Slopes. Final cut and/or fill slopes shall not exceed two (2) feet horizontal to one (1) foot vertical, except as specified below: (1) Final slopes to a maximum of one and one-half(1 '/3) feet horizontal to one (1) foot vertical may be maintained when site-specific geologic and engineering analysis demonstrate through a slope stability analysis that the proposed final slopes will have a minimum slope stability factor of safety as required in Section 9-1415.2(k)(4), while demonstrating suitability for the proposed end use and protecting against erosion (by means of revegetation or other methods approved by Development Services Division). 6). Fill Slopes. Fill slopes shall be constructed consistent with recommendations from a qualified civil/geotechnical engineer based upon site-specific geologic conditions. I. FENCING: Fencing four (4) feet in height consisting of not less than three (3) strands of barbed wire, or an approved equivalent, shall be placed around the excavation area where slopes steeper than two (2) feet horizontal to one (1) foot vertical are maintained. Six (6) foot high security fencing or an approved equivalent shall be required where slopes steeper than two (2) feet horizontal to one (1) foot