A. Construction of Streets

A. Construction of Streets

  1. Right of Way Width - The minimum ROW width shall be sixty (60) feet for rural areas and sixty-six (66) feet for urban areas. Greater width may be required if, in the opinion of the Planning Board, it is needed to provide adequate room for the proposed street, sidewalks if required, street utilities, drainage, grading and snow storage.
  2. Clearing and Grubbing - The entire limits of the road-bed shall be cleared of all trees, stumps, roots, boulders and like materials. In addition, all topsoil and unsuitable materials must be removed from the limits of the road bed. In no case shall the limit of clearing and grubbing extend less than 10 feet from the road shoulder.
  3. Geotextile Placement – Except where both the native soil and embankment material contain less than 12-percent fines (#200 sieve or finer), a woven geotextile shall be placed at subgrade. Where the embankment material contains less than 12-percent fines, the geotextile shall be positioned at the base of the embankment. The geotextile shall be equivalent to, or stronger than Mirafi 500X.
  4. Embankment Material - In areas of fill, unsuitable material or in the presence of water, the construction of an embankment will be required to bring the level of the street up to that which is needed to place the aggregate subbase. The embankment shall be brought to subgrade in horizontal lifts with common material which is suitable for road construction as approved by the Town. Testing of the materials shall be done at the applicant's expense.
  5. Aggregate Base and Subbase Materials – The aggregate subbase course shall consist of twelve inches of gravel, N.H. DOT Item 304.2, and the aggregate base shall consist of six inches of crushed gravel, N.H. DOT Item 304.3. Testing of the materials' gradation (AASHTO T27 and T11) and proctor (AASHTO T99) shall be done at the applicant's expense. See Detail 1. These are minimum standards. The amount of aggregate base and subbase materials shall be increased in areas of poor soils and for roads carrying commercial/industrial traffic. A geotechnical investigation may be required.
  6. Compaction - Compaction is required for the embankment, aggregate base and subbase materials. It shall be performed by using vibrating rollers and water in lifts of no greater than twelve inches. Compaction shall be performed until the required density is achieved. Density shall be determined by AASHTO T238 method and shall not be less than 95 percent of the maximum density determined in accordance with AASHTO T99.
  7. Pavement
    1. Binder Course - A 2 to 3-inch lift of pavement (see details 1A and 1B) meeting New Hampshire Standard Specifications for Road and Bridge Construction, Division 400, Section 401.
    2. Wearing Course - A 1 to 1 1/2-inch lift of pavement (see details 1A and 1B) meeting New Hampshire Standard Specifications for Road and Bridge Construction, Division 400, Section 401.
    3. Pavement shall not be installed when the outside air temperature is below 40 degrees Fahrenheit, nor when the road base temperature is below 40 degrees Fahrenheit. Temperature of pavement mix relative to road base temperature when spread shall be in accordance with Table #3. Pavement shall not fall below 185 degrees Fahrenheit prior to the completion of rolling. Pavement shall not be installed when the subgrade is frozen or the grades are incorrect. On newly constructed roads, the base course and the wearing course shall not be installed in the same season.
  8. Shoulders - In accordance with Detail 1. Shoulders shall be installed on both sides of the street and shall consist of modified crushed gravel, NHDOT Item 304.33. When curbs are installed this section shall not apply.
  9. Loaming and Seeding
    1. All remaining disturbed areas within the right of way shall have four inches of loam, which is free of stumps, roots and other unsuitable material, installed.
    2. All remaining disturbed areas within the right of way shall be fertilized and seeded in accordance with sec 646 of NHDOT specifications, except that all mulch shall be anchored with a tackifier at a minimum.
    3. The seeding of slopes and ditches shall require the use of erosion control matting.
  10. Cross Sectional Grading of Slopes
    1. Cross Sectional elements shall be in accordance with Details 1A and 1B.