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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; (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: A. Final slopes to a maximum of one and one-half(1 1/2)feet horizontal to one (1)foot vertical may be maintained when site-speck 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). B. Final slopes to a maximum of one (1) horizontal foot to one (1) foot vertical may be maintained under water(beginning five(5)feet below the lowest water table on the property experienced in the preceding three (3) years) when site-specific geologic and engineering analysis demonstrate through a slope stability analysis that the proposed saturated slopes will have a minimum slope stability factor of safety as required in Section 9-1415.2(k)(4); (6) Fill Slopes. Fill slopes shall be constructed consistent with recommendations from a qualified civiVgeotechnical engineer based upon site-specific geologic conditions; m. 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 vertical are created, if the proximity of such slopes to residential uses or other uses involving a concentration of people so warrants. (Development Title Section 9-1415.3[1]) n. EXCAVATION/RECLAMATION SCHEDULE: The reclamation plan shall show the phases of excavation. Reclamation on one phase of an excavation shall be initiated prior to the start of the next excavation phase. The final reclamation of any phase of excavation shall be completed within two years of the commencement of the reclamation process. Excavation shall be limited so that at any point of time a maximum of one phase is being reclaimed while one phase is being excavated. (Development Title Section 9-1415.3[0]) o. TIME LIMITATION: The Quarry Excavation Permit shall expire four (4) years from the date of approval. p. ANNUAL INSPECTION REPORTS: Annual inspections of the excavation shall be conducted by the County to ensure compliance with the conditions of the permit and the reclamation plan. The County may use professional services as provided for in Section 9-240.11. The consultant shall be selected Conditions of Approval -3 - PA-0500403