(a) Prior to the design and submission of the construction plans and profiles, the developer or his representative shall retain a reputable soil testing laboratory to make soil borings beneath the pavement of the proposed project. The spacing of the borings shall be at intervals of approximately 500 feet along the pavement center line. Every project shall have a minimum of two borings. The depth of the borings shall be made to a minimum depth of four feet below the proposed pavement center line grade. The following tests shall be made on each soil stratum encountered below the proposed grade line of the pavement:
(l) Natural moisture content;
(2) Mechanical analysis (sieving and hydrometer);
(3) Atterberg's Limits and Group Index;
(4) Modified Proctor Tests in C.B.R. mold (set of three moisture density relationships);
(5) California Bearing Ratio in C.B.R. mold (set of three);
(6) Standard Proctor Tests.
The tests must be made in accordance with the current procedures of the American Society for Testing Materials.
(b) After the report has been received from the soils testing laboratory, the pavement shall be designed as follows:
(l) Maximum gross loading on Municipal streets, excluding truck routes or State routes, is five tons.
(2) The distribution of gross loading shall be twenty percent to front axle and eighty percent to rear axle. Pavement shall be designed for a maximum axle loading of 8,000 pounds. (Loads adopted from A.A.S.H.O. Specifications for Highway Bridges, 1957.)
(c) The submission of construction plans and profiles by the developer or his representative to the City shall include three copies of the soil laboratory report.
(d) Sufficient Standard Proctor Tests shall be made during construction to determine the condition of the subgrade. The tests shall be performed by the same laboratory as used during the original testing.
(e) The costs of all soil testing shall be at the expense of the developer or benefiting owners. (Ord. 1966-3. Passed 5-9-66.)