17.32.070 APPLICATION REQUIREMENTS

All applications to the planning commission for development in the hillside overlay zone shall be accompanied by the following technical information reports, all prepared by a licensed civil engineer or landscape architect, as the case may be, in sufficient detail to allow evaluation of the health, safety and general public welfare aspects of the development. The reports shall include: A. Site Development Plans: 1. A grading or earth moving plan showing: a. Existing and proposed contours of the property. The contour lines shall extend to at least one hundred feet (100') outside the property lines, or a sufficient distance to show on and off site drainage channels (contour intervals by two feet (2’) on slopes less than fifteen percent (15%) and five feet (5’) on slopes of fifteen percent (15%) or greater), b. Existing Hillside Overlay classifications before grading and proposed Hillside Overlay classifications after grading. Slopes measured over fifty feet (50’) shall be shown on each lot in the steepest area of the lot for the existing condition and the final condition. c. The slopes and cross sections of proposed cuts and fills. The height of any cut or fill shall not exceed four feet (4') nor shall the combined height of cuts and fills on any cross section exceed six feet (6') unless supported by retaining walls, terracing, landscaping or other techniques for stabilizing the cut and fill slopes and are approved by the city council, based on the recommendation of the city engineer. All excavation and fill areas shall conform to the uniform building code as amended, and d. Material disposal plans including disposal sites and locations; 2. Detailed plans of all surface and subsurface drainage systems and control structures including retaining walls, cribbing and other erosion protection devices to be constructed in connection with, or as part of, the proposed project, together with a map showing the drainage area to be served; 3. Detailed site plans and elevation drawings showing the location of all existing and proposed streets, easements and drainage channels; 4. Traffic flow study if deemed necessary by the city engineer; 5. Detailed site plan showing the location and proposed connection points of utilities, including, but not limited to, water, natural gas, electricity, sewer and telecommunications; 6. A fire protection plan accompanied by letters of approval from the fire chief and the county fire marshal; 7. Detailed site plan showing the boundaries of any established FEMA or any other floodplain within the property and within six hundred feet (600') of the property lines. B. Drainage Control Plan And Report: A drainage control plan and report based upon the following criteria: 1. All drainage systems shall be separate and independent from the sanitary sewer system. 2. Drainage and flood control designs shall be in conformance with the city flood control master plan. 3. No natural drainage channel shall be filled, obstructed, or diverted, nor shall the point of entrance and exit from the property be changed without the approval of the city engineer. 4. All of the drainage basin upstream of the development shall be considered in the analysis as fully developed and considered in the design of any storm water drainage facilities. 5. The effects on the downstream property owners relative to increased flood potential shall also be considered in the design, including acquisition of easements, agreements, constructions or modification of improvements where needed. 6. Developments shall use existing drainage channels or newly constructed control structures and retention facilities to control its stormwater runoff so that no net increase in storm runoff will occur on the downstream properties. 7. Streets may be used for storm runoff up to reasonable limits consistent with traffic safety. 8. The storm water from a 100-year frequency storm with a duration equal to the time of concentration shall be adequately conveyed within the limits of the street right of way or in storm drainage channels, from the project to established drainage outlet channels without creating flood hazards to dwellings. 9. When an underground pipe system is required, it shall be designed to carry a 25-year storm. Major hydraulic structures shall be designed to carry a 50-year storm. The minimum storm drain size shall be twelve inches (12"). 10. Unless specifically permitted, retention basins on hillsides shall not be allowed. 11. Detention basins shall be used to reduce the effects of the peak runoff from storms and to release water flow at the preproject or at an otherwise approved rate. 12. Detention basins shall not be allowed in locations where they will be incompatible with the surrounding landscape or where they would present a hazard to public safety. 13. Cross gutter drains shall not be allowed. 14. When springs or other ground water sources are found on the property, development plans must be reviewed and approved by the appropriate governing agency. 15. All building shall be constructed outside the limits of any 100-year floodplain. Foundations within five hundred feet (500') of the floodplain boundary shall be a minimum of eighteen inches (18") above the 100-year flood stage, except on floodplains subject to FEMA regulations, in which case they shall be two feet (2') above the 100-year flood stage. 16. Necessary measures shall be taken to prevent erosion surface and channel erosion throughout the development. Erosion mitigation shall be taken at all points of discharge and on the face and toe of any cut or fill slope. 17. During grading or construction on any property (including off-site construction), the developer shall control both water used for construction and storm runoff in such a manner as to not affect any adjoining properties, nor add silt or debris to any existing storm drain, wash, channel, or roadway. C. Geotechnical Report: As defined in Chapter 17.14.080. D. A Landscape Plan: The plan shall be of adequate scale and detail to indicate general grading and plantings along irrigation and temporary erosion control. For areas to be used as surface retention basins for stormwater runoff, the plan shall identify the location and sizing of control facilities and address operation and maintenance of the control facility in conjunction with the landscape improvements. The plan shall describe how vegetation in excavated and filled areas will be restored. The plan shall specify types of retention being used, together with sprinkler plans and water usage methods suitable to the soil of the project. E. Additional Information: Other reports, plans and information as may be deemed necessary by the planning commission, city council, or city engineer may be requested as a condition of the applicable procedures. (Ord. 2022-5, 2022: Ord. 2000-9 § 1: Ord. 99-02-18-01 § 2)