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15. Horizontal curves on residential streets with concrete curb and gutter shall be designed to ensure a horizontal sight distance of not less than 100 feet. The minimum design speed shall be 30 MPH. The following are other minimum requirements for residential streets: a. Horizontal curves shall have a minimum of 180 -foot centerline radius. Refer to MnDOT State Aid Manual for more information. b. Vertical curves shall be designed as follows: L=KA Where L = Minimum length of vertical curve in feet K=20 A = Algebraic difference in grade in percent 18. Vertical curves and horizontal curves on collector streets with concrete curb and gutter shall be designed to ensure a vertical and horizontal sight distance of not less than 300 feet (arterials = 500 feet minimum). The following are other minimum requirements for collector streets: a. Horizontal curves shall have a minimum of 300 feet centerline radius without super elevation on 30 MPH design streets and a minimum of 450 feet centerline radius without super -elevation on a 35 MPH design street. Refer to the MnDOT State Aid Manual for more information. b. Horizontal curves shall have a minimum tangent of 300 feet between reverse curves. F. SANITARY SEWER SERVICES 1. Service lines shall be sized in accordance with the Minnesota Plumbing Code — Chapter 4715. 2. The number of capita per dwelling unit used in design calculations shall be approved by the City. 3. The pipe material for sanitary services shall be a minimum of 6 -inch PVC SDR 26. 4. The sewer service shall be included in the pressure and leakage testing requirements for the main lines. 5. Minimum grade for sanitary service stubs shall be 1/8 inch per foot (1%). 6. Sanitary sewer services shall be constructed with 6 -inch DIP Class 52 from main line sewer to the 45° bend when DIP is used for the main line sewer itself. The City requires all services with risers to be televised.