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g. HOURS OF OPERATION: Plant operations shall normally be carried on during the hours from 5:00 a.m. to 9:00 p.m. (Development Title Section 9-1415.3[f]) h. REPLACEMENT OF TOPSOIL AND REVEGETATION: 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 (Development Title Section 9-1415.3[g]). The site shall be revegetated in accordance with the Reclamation Plan (Exhibit A). i. WEED CONTROL: If noxious weeds are on the site, operations shall be in accordance with instructions from the Agricultural Commissioner of San Joaquin County. (Development Title Section 9-1415.3[h]) 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. (Development Title Section 9-1415.3[j]) 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. (Development Title Section 9-1415.3[k]) (1) 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 no 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. A. In accordance with mitigation measures required of this project, working slopes adjacent to the Stillmann Magee County Park shall not exceed 2 horizontal to 1 vertical. (2) Slope Stability Factors of Safety. When required by the Development 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 sealed 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. (3) Prior to the quarry operations progressing to a location which may impact the bluff location at the northeast boundary of the quarry site, a geologic and engineering analysis shall be conducted, and all recommendations of the analysis shall be followed to ensure the stability of the bluff. Conditions of Approval - 2 - OX-99-2