12.08.140 Road construction standards – General.
A. Typical Section. Gravel roads shall be constructed in accordance with the gravel road typical section drawing and associated Table A [see figure 1]. Additional requirements are:
1. Roads must be contiguous with the existing road system maintained by the borough and the state. All roads must be on a dedicated right-of-way and must be built along the right-of-way centerline. A minimum right-of-way width shall be 60 feet, enabling utilities to be installed outside the edge of roadside ditches.
2. All organic material shall be stripped and removed to a minimum depth of four feet below the finished grade. If geotextile is used over organics, then the depth of sub-base must be three feet minimum or greater as required for stable embankment.
3. The roadway embankment shall be placed in maximum one-foot lifts and compacted to not less than 90 percent of maximum density, as specified by AASHTO for material application. Density shall be determined by AASHTO T 180, method D.
4. Onsite usable excavation material may be used as sub-base with approval from the public works superintendent.
B. Project-Specific Design. Category III roads require a project-specific design prepared and sealed by a licensed professional civil engineer in accordance with the Category III gravel road typical section drawing and associated Table A. The design shall be approved by the borough as provided for in HMC Title 18. Once the project is complete, as-built plans, prepared and sealed by a licensed professional civil engineer, shall be submitted to the borough. The as-built shall illustrate horizontal alignment, finish grade profile, typical section of the roadbed, and material specifications. The as-built plans are required prior to municipal road maintenance. (Ord. 08-03-180)