(A) Materials. All material placed in fills and embankments shall meet the requirements of general fill as previously defined. No rocks or stones shall be placed within the upper 18 inches of any fill or embankment. Rocks or stones within the allowable size limit may be incorporated in the remainder of fills and embankments provided that they are distributed so that they do not interfere with proper compaction, except that no rocks or stones shall be placed in a fill area under structures.
(B) Placement.
(1) Backfill and fill materials shall be evenly placed adjacent to structures, piping or conduit to the required elevations. Care shall be taken to prevent the wedging action of backfill against structures or the displacement of piping or conduit by carrying the material uniformly around the structure, piping or conduit to approximately the same elevation in each lift.
(2) Where fill is required on both sides of a foundation or wall, the fill shall be placed simultaneously on each side. Fill against building walls shall not be placed until the first floor slab has been poured and set.
(3) Fill against other work shall be in a manner and at such time so as not to endanger the stability or damage the work. No fill shall be placed against water-bearing walls until they have been tested for watertightness.
(4) No fill shall be placed over snow or frozen material.
(5) Materials such as brush, hedge, roots, stumps, grass and other organic matter shall not be incorporated or buried in the fill.
(C) Compaction.
(1) The compaction of backfill and embankment material shall be accomplished by mechanical means such as vibratory plates or rollers.
(2) Compaction by jetting methods will not be performed unless specifically allowed by the town. No backfill shall be deposited or compacted in water.
(3) Backfill shall be placed in 12-inch lifts and compacted to not less than 95% of maximum dry density as determined in accordance with ASTM D698 (Standard Proctor) up to the last 12 inches of fill. The final 12 inches of fill shall be compacted to not less than 100% of maximum dry density as determined in accordance with ASTM D698. Embankment fill shall be placed in lifts and compacted to not less than 98% of maximum dry density. The moisture content shall be within two percentage points of optimum. The contractor shall demonstrate to the town that the proposed method and lift heights meet the specified compaction at the beginning of the project.
(4) Granular fill under slabs shall be placed after the subgrades have been leveled and cleared of all debris and immediately prior to the pouring of the slab. Up to the last 12 inches of fill shall be placed in eight-inch maximum, balanced lifts and each layer compacted to 95% of Standard Proctor maximum dry density in accordance with ASTM D698. The final 12 inches of fill shall be placed in six-inch maximum, balanced lifts, and each layer shall be compacted to 100% Standard Proctor maximum dry density in accordance with ASTM D698.
(Ord. 2010-3, passed 10-6-2010)