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•• .o Z PART II H. STREET AND ROAD DESIGN 1. Geometric Section. The geometric section shall conform to Improvement Stan and Drawings . Where a subdivision or any part thereof lies along an existing improved public highway or road, the developer shall improve or agree to improve the area of such highway or. road lying between the surfaced portion thereof and the curbs or gutters constructed by the subdivider in accord- ance with the Improvement Standard Drawings . 2 . Profile . A vertical curve shall be provided when the grade differential is greater than 0 . 50%. The cross slope of the street shall be as shown on Improvement Standard Drawings . Concrete curb and gutter shall have a minimum grade of 0 . 25%. All elevations should be based on U.S .G.S . or City of Stockton datum. 3. Structural Section . The minimum design of the structural section shall conform to the Structural Pavement Design Chart of the Improve- ment Standard Drawings . The Resistance Value (R-Value) of the base- ment soil samples taken at the proposed construction site shall be determined by Test Method No. 301 of the current Materials Manual of the State of California Department of Transportation. The Traffic Indexes (T.I . ) shall be determined by the following street categories unless otherwise specified by Public Works Department. T. Cul-de-sac of 12 or fewer lots 3 . 5 Cul-de-sac of 13 or more lots 4 .0 Local Street 4 .0 Minor Collector Street 5 .0 Major Collector Street 6 .0 Industrial Street 8 .0 Any street that could be regarded as being in more than one category shall be classified in the category with the highest Traffic Index. The minimum structural section shall be two inches of asphalt concrete over prime coat and native material which has been treated with a soil sterilant. IIS-1