9.00 CONSTRUCTION STANDARDS
9.03 Streets and Ways
- An area within the right-of-way lines, of a width to be determined by the Planning Board based on local conditions of the site, except for trees and other vegetation intended to be preserved, shall be cleared and grubbed of all stumps, brush, roots, and like material. In all cases, the cleared area shall be equal to, at a minimum, the width of the proposed street plus six (6) feet on either side, and at a maximum of the entire width of the right-of-way. All rock or masonry with a maximum dimension over three inches and within six inches of the top of sub-grade shall be removed. Trees intended to be preserved shall be protected by suitable boxes, fenders, or wells as appropriate.
- The centerline of all streets shall coincide as nearly as possible with that of the full right-of-way and shall in no case vary more than four feet in either direction.
- In a cut area all material shall be removed to sub-grade. All unsuitable material, such as peat, highly organic silt or clay, or any other material that, based on results of test borings, is considered to be detrimental to the sub-grade, shall be removed and replaced by bank-run gravel, which shall be compacted with a ten-ton roller.
- Topsoil, defined as fertile, friable, natural material which has demonstrated vegetative growth, and found on the site, can be used within the right-of-way, provided it conforms with the relative provisions of §751 of the Standard Specifications.
- In fill areas the embankment shall be ordinary borrow specified and placed, as in the relevant provisions of §150 of the Standard Specifications.
- Before the ground base course is spread, the sub-grade shall be shaped to a true surface conforming to the proposed cross section of the road. Where fill is required, it shall be placed in layers not deeper than twelve (12) inches loose, except that the last layer shall not exceed four (4) inches in depth. The fill shall be ordinary borrow, specified and placed as in the relevant provisions of §150 of the Standard Specifications. A tolerance of one-half (1/2) inch above or below finished sub-grade will be permitted, provided this difference is not maintained over fifty (50) feet and the required cross section is maintained.
- All streets shall be crowned at the centerline, at a pitch of one quarter inch per foot. A completed street shall include the following:
- Twelve inches of bank run gravel, consisting of durable stone and coarse sand, free from loam, clay, and rubble or bio-degradable material. Maximum size of stone shall be four inches in largest dimension. Gravel shall be installed in two layers of six inches each, each layer being compacted by a roller weighing at least six tons.
- Six inches of processed gravel, which shall meet the requirements of §7.a. above, except that the maximum size stone shall be two inches in largest dimension. Gravel may be installed in one layer.
- A two inch base course, which shall be asphalt concrete, in accordance with §420, Class I Bituminous Concrete Pavement type I-l (Binder Course Mix). Paving material shall be placed directly over a gravel base having a compacted thickness of at least eighteen inches. Pavement shall be put down with straight edges and shall be compacted by a ten-ton roller. Paving material shall be placed by paving machine.
- A two inch (2”) top course of asphalt concrete, in accordance with §460, Class I Bituminous Concrete Pavement Type I-l (Top Course Mix). The top course shall be compacted as required in 7.c. above. Paving shall be placed by paving machine.