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Specification <br />Size <br />% Finer by Weight <br />#10 <br />41-32 <br />#40 <br />24-14 <br />#200 <br />12-6 <br />TLCS-1402 <br />EPANSMISSION' <br />This backfill option shall be mechanically tamped using equipment authorized by the Owner's <br />Representative. The Constructor shall place dense graded aggregate in 6- to 12-inch loose lifts. <br />Another acceptable backfill option is the open -graded aggregate with the gradation shown in Table 2. <br />Table 2: Gradation of Open -Graded Aggregate <br />Size % Finer by Weight <br />1-1/2" 100 <br />1" 95-100 <br />%" 25-80 <br />#4 0-10 <br />#8 0-5 <br />Open -graded aggregate requires less compaction to achieve a dense state and thus may be placed <br />in lifts of 24 inches. Open -graded aggregate must be fully encapsulated and/or confined in order to <br />remain adequately dense. Thus, the uppermost 3 feet of backfill must be comprised of either native <br />soil or dense -graded aggregate to act as a "cap" to keep the open -graded aggregate encapsulated <br />and/or confined. <br />Aggregate backfill shall be mechanically tamped using equipment authorized by the Owner's <br />Representative. Backfill shall be compacted with as many passes as are required to achieve a compacted <br />state where the backfill is no longer pumping or excessively deflecting under the compaction effort <br />and in all cases shall not be less than two passes. <br />Backfill shall be installed full depth and banked 15 inches above the normal ground line as described <br />in section 10.1. <br />10.3 Lean Concrete (or Slurry) Backfill <br />All material shall be furnished by the Constructor. <br />If permitted by the Owner's Engineer, a tremie tube can be placed at the bottom of the hole beside <br />the pole. Coarse aggregate with a #2 gradation per ASTM C33 guidelines shall then be placed loosely <br />around the pole (for full embedded depth) to support it temporarily. After verifying that the pole is <br />Rev. 1 Construction Specification for the Installation of Steel Poles Page 19 of 24 <br />