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Page 18 of 24 Construction Specification for the Installation of Steel Poles Rev. 1 <br />TLCS-1402 Specification <br />10.0 Backfill <br />Backfill shall be placed immediately after pole installation has been completed and inspected. If it is <br />not possible to complete the backfill operation at that time, the open excavation shall be protected <br />with waterproof material and properly barricaded or covered during the period of open excavation. <br />The pole must be supported until all the backfill operations are completed. <br />Wet holes shall be dewatered before backfilling. <br />Backfill shall be inspected by the Owner’s Representative before final acceptance of the completed <br />project. If earth is found disturbed around any pole during inspection and has settled below the normal <br />ground line, the Constructor shall add and compact additional backfill around the pole to the required <br />height in accordance with the provisions of this section. <br />Special attention shall be given to backfilling rock holes to make sure no voids are left between the poles <br />and the sides of the holes. Excess rock shall be removed from the site. <br />10.1 Native Soil Backfill <br />Soil removed from excavations may be used for backfill provided all vegetation, debris, and rocks <br />greater than 1.5 inches in diameter have been removed. Native soil composed primarily of silt or <br />clay should not be used as backfill. Soil that is soft or wet shall not be used as backfill. Backfill shall <br />be installed to a height of 15 inches above the normal ground line. The backfill installed above the <br />normal ground line shall slope not less than 1 vertical to 3 horizontal away from the face of the pole. <br />All native soil not reused for purposes of backfill must be removed from the right of way. <br />The Constructor shall backfill all excavations in 6- to 12-inch loose lifts. Native soil backfill shall be <br />mechanically tamped using equipment authorized by the Owner’s Representative. Backfill shall be <br />compacted with as many passes are required to achieve a compacted state where the backfill is no <br />longer pumping or excessively deflecting under the compaction effort and in all cases shall not be <br />less than two passes. <br />10.2 Coarse-Aggregate Backfill <br />All material shall be furnished by the Constructor. <br />A compactable backfill shall consist of crushed stone, commonly called “road sub-base aggregate” <br />or “dense graded aggregate,” similar to the gradation in Table 1. <br />Table 1: Gradation of Coarse-Aggregate Backfill <br />Size % Finer by Weight <br />1഼ 100–94 <br />3/8഼ 72–63