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4. EN MONMENTAL ANALYSLS ~' 4.7 GEOLOGY,SOILS,AND SEISMICrrY Terraces for reclaimed final slopes shall be sloped back towards the fill and be designed such that runoff is directed to collection points where it can enter catch basins and be conveyed via pipes or other acceptable conveyance to the toe of slope. The spacing of collection points shall be no ► greater than 1,500 feet, with each reclaimed final slope face that has terracing shall have a minimum of one (1)down drain. The method of transporting the water along the flow line of the terrace to the down drain, so as to prevent erosion and possible slope failure, shall be approved by 6' the Development Services Division. The method of drainage of terraces for temporary slopes at setback lines shall be submitted to Development Services division for approval. (3) Slope Modification Requirement. The Review Authority may require slopes flatter 4. than those specified below for safety or aesthetic purposes if the proximity of residential and other urban uses,waterways or roads,the instability of materials,or the surrounding terrain so warrants. i If after one(1)year or more of extraction the approved slope does not remain stable,the Review Authority shall have the authority to reduce the slope or require other appropriate measures in the immediate area and other areas as deemed necessary in order to correct the condition as well as require the operator to correct the deteriorated slope. r (4) 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: �- (A) A minimum factor of safety of 1.5 against static deep seated failure. (B) A minimum factor of safety of 1.5 against static surficial failure. (C) A minimum factor of safety of 1.1 against seismic failure; a (5) 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 F 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. (6) Final Slopes. Final cut and/or fill slopes shall not exceed two(2)feet horizontal to ., one(1)foot vertical, except as specified below: (A) Final slopes to a maximum of one and one-half 0 1/2) 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 RMC Pacific Vemalix(tuany Mining aM Reclamation Pmjec[ 4.7-13 ESA 1203015 Adm shative Drnft EIR Match 2004