(A) The subbase course is that select granular fill material lying between the subgrade and the surface course or pavement. The thickness of the subbase course shall be 12 inches after compaction, laid in two six-inch layers over the entire roadway area and rolled up to consolidation by a roller weighing not less than ten tons. Finished width shall be at least 34 feet for a width between curbs of 30 feet and 28 feet for widths between curbs of 24 feet. Material for the subbase course shall be coarse bank run gravel, crushed stone or tailings, subject to the approval of the Board of Selectmen or its properly designated agent, in accordance with State Highway Specifications 3.02 of 809.
(B) If required by the Board of Selectmen, or its designated agent, sufficient water and calcium chloride or other approved bonding agent shall be added to assure thorough compaction of the material being used for the subbase coarse.
(C) The finished grading of the subbase coarse shall conform to elevations as shown on plans and profiles.
(D) The finished rolled gravel base shall be four inches thick in accordance with State Highway Department Specifications 3-02.03 of § 302. Town inspection shall be required during construction and when completed.
(Ord. passed 4-1-1968; Ord. passed 12-13-1976; Ord. passed 8-16-1982)