(a) Compliance. The design of all flexible and rigid pavement within the jurisdiction of the Municipality shall meet the minimum pavement design requirements set forth in subsection (b) herein. If local soil conditions, present and future traffic requirements, route location and/or other special considerations warrant further study, the pavement shall be designed in accordance with the pavement design criteria set forth in subsection (c) herein.
(b) Minimum Pavement Design Requirements.
(1) No vertical curve shall be established unless the algebraic differential of grades is greater than one percent (1%).
(2) On any vertical curve, the grade shall be at least one-half percent (0.5%) between adjacent points.
(3) No top of curb or gutter grade shall be less than one-half percent (0.5%).
(4) The maximum pavement grade shall be six percent (6%) and the minimum shall be one-half percent (0.5%). Any change from such grading must be approved by the Engineer and/or Municipality.
(5) The minimum length of any vertical curve shall be 100 feet.
(6) The minimum no passing site distance shall be 200 feet on any vertical curve.
(7) Top of pavement grades shall be established on intersection details at the following locations:
A. At all ends of radii in gutter and on pavement centerline.
B. At gutter in center of radii.
C. At radii P.I.’s.
D. Intersection of pavement centerline with lines connecting radius
P.I.'s.
E. Intersection of pavement centerlines.
F. Any other point necessary to clarify drainage and to reduce bumps.
(8) Inlets and catchbasins shall be located at or beyond end of radius. If radius is thirty feet or greater, inlets and catchbasins may be located in radius.
(9) Through gutters shall not be allowed.
(10) A thirty foot minimum radius shall be used on uncurbed pavements at intersections. The absolute minimum allowable design of flexible residential pavement will be three and one-half inches of asphalt concrete, State Specifications 402 and 404, over eight inches of aggregate base, State Specification 304, or equivalent structural thickness.
(11) The absolute minimum allowable design of residential Portland cement concrete pavement with integral concrete curbs shall be six inches in depth and will include longitudinal joint tie bars. The modulus of rupture used shall be 600 psi.
(c) Pavement Design Criteria.
(1) Soil tests. Soil tests shall be furnished for every 600 lineal feet of pavement with a minimum of one test per pavement. The Municipality shall be given the opportunity to approve the location of soil boring on private work prior to the tests being made and reserves the right to require additional tests if unusual conditions exist.
All borings shall be made to a minimum depth of three feet below the proposed top of curb grade, unless rock is encountered.
Tests of each different soil layer encountered below the proposed grade line shall include the following:
A. Moisture determination - actual and optimum.
B. AASHO Classification and group index - each sample:
1. Atterburg Limit;
2. Liquid Limit;
3. Plastic Limit;
4. Plasticity Index;
C. Mechanical analysis.
D. Laboratory C.B.R. or Modulus of Subgrade Reaction "K" may be made in the following manner. Where more than one soil test is taken on a given project, the Laboratory C.B.R. or Modulus of Subgrade Reaction "K" shall be made on the sample indicating the highest group index, providing that the group indices fall within a range of five. If the group indices do not fall within a range of five, a Laboratory C.B.R. or Modulus of Subgrade Reaction "K" shall be made for the highest indicated group index to each range of five of the soil tests made. If all the group indices have the same value, the Laboratory C.B.R. or Modulus of Subgrade Reaction "K" shall be made on the sample having the highest percent of particles passing the No. 200 sieve.
E. Maximum laboratory dry weight.
F. Elevation of water table should be recorded twelve to twenty-four hours after water is encountered during boring operations. All soil tests will be performed by a recognized laboratory.
(2) Pavement design. The current list of manuals and standards to be used in the design of pavements are as follows:
A. "Manual of Location and Design" by the Ohio Department of Highways.
B. "Construction and Material Specifications"; State of Ohio Department of Highways - current issue.
C. "The Design of Concrete Pavements for City Streets" by the Portland Cement Association (1963).
D. "Thickness Design for Concrete Pavements" by the Portland Cement Association (1966).
E. "Thickness Design - Asphalt Pavement Structures for Highways and Streets" by the Asphalt Institute (March 1964) Manual MS-1, Seventh Edition.
Pavement design shall be based on equivalent daily 18,000 pounds single axle applications as indicated. Streets which are to serve as major or minor collectors, arteries or have special traffic conditions shall require actual classification counts or estimates. The following approach is usable for residential streets only:
A. The normal residential street shall have a twenty year design for four axles per lane per day at the legal limit of 18,000 lb. single axle or 32,000 lb. dual axle.
B. If the maximum dry weight of the soil is less than 100 lbs. per cubic foot, a minimum of four-inch subbase course shall be used on either section called for.
C. Design calculations shall be submitted along with proposed typical section and proposed grade line with the soil test holes superimposed on the profile. A complete soil test report shall also be submitted.
(Ord. 71-14. Passed 11-9-71.)