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4.7 Geology,Soils,and Seismicity f� (g) Replacement of Topsoil. In agricultural areas,the topsoil shall be set aside, and upon completion of an excavation,the topsoil shall be replaced and the site leveled in conformance with the excavation permit. This requirement may be waived if the property is to be rehabilitated for a use other than agriculture which is consistent with the General Plan, or if a soils report indicates the replacement of the topsoil will not enhance the ` agricultural suitability of the property. In such cases, the topsoil may be removed from the site. (j) Setbacks. No excavation shall take place within twenty-five(25)feet of any property line or right-of-way (nor within the allowed slopes adjacent to said twenty-five(25)foot setback),unless the elevation prior to excavation is more than that of the abutting property, in which case the elevation within said twenty-five(25) foot setback shall at no time be less than that of the abutting property,at the property line. (k) Slopes. The following provisions do not apply to temporary interior cut slopes(i.e., working slopes that do not fall within any of the criteria listed below). Temporary interior cut slopes shall comply with the Cal OSHA Code of Regulations and/or the Federal OSHA Code of Regulations as applicable. (1) Terracing Required. All slopes over fifty (50) feet in height shall be terraced with a maximum vertical distance between terraces of fifty (50) feet. Each terrace or bench ` shall be a minimum of twelve(12) feet wide. (2) Terrace Drainage. Drainage plans with calculations shall be submitted for approval to Development Services Division for all terraces as part of the Reclamation Plan. V Terraces for reclaimed final slopes shall he 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 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. 6. (3) Slope Modification Requirement. The Review Authority may require slopes flatter 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. r 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. ` (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. •. RMC Pacific Vernalis Quarry Mining and Reclamation Project 4.7-13 ESA/203015 Draft Environmental Impact Report May 2006 r