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I. Future Street Extensions <br />Tentative grade designs for future extensions of curbs and alleys shall be shown on the <br />profiles and shall extend far enough to verify the proposed design (200 feet or through <br />the adjoining intersection). <br />J. Grades <br />1. Breaks <br />With the exception of grade breaks at driveways and access ramps, grade breaks shall <br />be used when the grade change at a station is: <br />1. 0.6 percent or less for Arterial streets; <br />2. 0.8 percent or less for Collector streets; <br />3. 1.0 percent or less for Local streets; <br />4. 1.25 percent or less for steep hillside streets; and, <br />5. 3 percent or less for alleys. <br />Vertical curves meeting AASHTO K values for the design speed shall be used at all <br />other times. <br />2. Curbs <br />Curb grades shall be established so that the Hydraulic Grade Line for the design storm <br />event is no less than 6 inches below the gutter at any point where water could <br />surcharge into the street (catch basins, curb inlets, manholes). <br />Curb grades across the throat of access ramps shall be designed to accommodate <br />sidewalk access ramps and shall not exceed 2 percent. (See Section 2.03 for more <br />information. <br />Curb grades along short -radius curves, such as curb returns and cul-de-sac bulbs, shall <br />be 0.5 percent or greater. See Appendix E for Cul -de -Sacs, Hammerheads, and <br />Emergency Vehicle Turnaround Standard Details. <br />3. Gutters <br />The minimum gutter grade shall be 0.40 percent. Grades of 0.30 percent may be <br />approved by the City to match existing curb grades. <br />Public Improvement Design Standards Manual, 2016 Page 2-21 <br />