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A. Terraces for reclaimed final slopes shall be sloped back towards the fill and <br /> be designed such that runoff is directed to collection points where it can <br /> enter catch basins and be conveyed via pipes or other acceptable <br /> conveyance to the toe of slope. The spacing of collection points shall be no <br /> greater than 1,500 feet, with each reclaimed final slope face that has <br /> terracing shall have a minimum of one (1) down drain. The method of <br /> transporting the water along the flow line of the terrace to the down drain, so <br /> as to prevent erosion and possible slope failure, shall be approved by the <br /> Development Services Division. <br /> B. The method of drainage of terraces for temporary slopes at setback lines <br /> shall be submitted to Development Services division for approval. <br /> (3) Slope Stability Factors of Safety. When required in this Title to provide site- <br /> specific geologic and engineering slope stability analysis, the following minimum <br /> slope stability factors of safety shall apply: <br /> A. A minimum factor of safety of 1.5 against static deep-seated failure. <br /> B. A minimum factor of safety of 1.5 against static surficial failure. <br /> C. A minimum factor of safety of 1.1 against seismic failure, <br /> (4) Temporary Cut Slopes at Setback Lines. Temporary cut slopes (i.e., for limited <br /> periods of time, slopes that are in the process of extraction prior to being <br /> backfilled) at setback lines shall not exceed one (1) foot horizontal to one (1) <br /> foot vertical, except that temporary cut slopes at setback lines to a maximum of <br /> one half (1/2) of a foot horizontal to one (1) foot vertical may be maintained if <br /> site-specific geologic and engineering analysis demonstrate through a slope <br /> stability analysis that the proposed temporary cut slopes will have a minimum <br /> slope stability factor of safety as required in Section 9-1415.3(k)(4). However, <br /> in the event that there are existing structures on the adjacent property (or the <br /> immediate potential for structures on the adjacent property), the excavation <br /> shall at not time be closer to the property line than a line projected on a slope of <br /> one (1) to one (1) from the property line to the toe of slope. <br /> (5) Final Slopes. Final cut and/or fill slopes shall not exceed two (2) feet horizontal <br /> to one (1)foot vertical, except as specified below: <br /> A. Final slopes to a maximum of one and one-half(1 1/2) feet horizontal to one <br /> (1) foot vertical may be maintained when site-specific geologic and <br /> engineering analysis demonstrate through a slope stability analysis that the <br /> proposed final slopes will have a minimum slope stability factor of safety as <br /> required in Section 9-1415.2(k)(4), while demonstrating suitability for the <br /> proposed end use and protecting against erosion (by means of revegetation <br /> or other methods approved by Development Services Division). <br /> B. Final slopes to a maximum of one (1) horizontal foot to one (1) foot vertical <br /> may be maintained under water (beginning five {5} feet below the lowest <br /> water table on the property experienced in the preceding three {3} years) <br /> when site-specific geologic and engineering analysis demonstrate through a <br /> slope stability analysis that the proposed saturated slopes will have a <br /> 4 <br />