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-4- c. STOCKPILES AND SCREENING: No stockpiled soil or material shall be placed closer than 25 feet to a property boundary except where shown on plans to provide a landscape berm or screening (provided that sight distances at road intersections are not impaired). (Development Title Section 9-1415.3[b]) d. PRIVATE ROADS: All private roads involved in an excavation shall be maintained so as to control the creation of dust. The first 100 feet of any private road on the property, which intersects, with a publicly maintained road shall be surfaced in a manner approved by the Director. Traffic-control and warning signs shall be installed, if required, at such intersections. The placement and size of these signs shall be approved by the Director of Public Works. (Development Title Section 9-1415.3[c]) e. EROSION CONTROL: Protective vegetative planting, silt screen dams, or other approved methods shall be required where necessary for the control erosion. An erosion and sediment control plan approved by Department Services Division shall be part of the reclamation plan. (Development Title Section 9- 1415.3[d]) f. PERFORMANCE STANDARDS: Standards contained in Chapter 9-1025 shall be met unless otherwise modified by conditions of the Quarry Excavation Permit. (Development Title Section 9-1415.3[e]) g. HOURS OF OPERATION: Plant operations shall normally be carried on during the hours from 5:00 a.m. to 9:00 p.m. Additionally, scraper operations shall not occur 400 feet of the two existing residences south of the project site during the hours from 10:00 p.m. to 7:00 a.m. h. REPLACEMENT OF TOPSOIL: The topsoil shall be set aside, and upon completion of an excavation, the topsoil shall be replaced and the site graded in conformance with the excavation permit. (Development Title Section 9- 1415.3[g]) 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 the setbacks as shown on the Excavation Plan dated May 4, 1999. k. TEMPORARY CUT SLOPES AT SETBACK LINES: The temporary cut slope shall not exceed 1.5 horizontal to 1 vertical.