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<br /> <br />02221 - 3/3 <br />3.05 BACKFILLING TRENCHES: <br />A. The CONTRACTOR shall be responsible for obtaining the necessary inspections <br />before, during and after backfilling and shall re-excavate, refill and perform all such <br />related work to obtain satisfactory test results. <br />B. The CONTRACTOR shall use excavated materials classified as embankment fill for <br />backfilling and such grading on the site as is required. The CONTRACTOR shall <br />dispose of any excess of fill or unstable material in areas approved by the <br />ENGINEER. Pipe trenches shall be backfilled with fine, loose embankment fill (see <br />SECTION 02220, paragraph 2.02), free from large stones, carefully deposited on <br />both sides of pipe and thoroughly and carefully rammed until enough fill has been <br />placed to provide a cover of at least one foot above the pipe. The remainder of the <br />backfill material may then be thrown in and tamped. Water settling may be permitted. <br />The CONTRACTOR shall submit written request detailing the need to perform water <br />settling and reasons why work in the dry is not possible. The Contractor shall also <br />submit detailed procedures for the review and approval of the ENGINEER. <br />Whenever trenches have not been properly filled, or if settlement occurs, they shall <br />be refilled, smoothed off and finally, made to conform to the surface of the ground. <br />Backfilling shall be carefully performed and the surface restored to the elevation <br />shown on the plans. In unpaved areas the surface of trenches shall conform and be <br />equal to quality, character and material to the surface immediately prior to making <br />the excavation. <br />C. Place earth embedment as follows: <br />1. With level bottom layer at proper grade to receive and uniformly support pipe <br />barrel throughout its length. <br />2. Form shallow depression under each joint to facilitate jointing. <br />3. Add second layer simultaneously to both sides of the pipe with care to avoid <br />displacement of the pipe. <br />4. Place material in maximum 12-inch lifts. <br />3.06 BACKFILLING OF TRENCH UNDER ROADWAY AND AREAS TO BE PAVED: The <br />CONTRACTOR shall place material in 12-inch maximum layers after filling one foot <br />above pipe as previously described. Each layer shall be compacted to 98 percent <br />maximum dry density as measured by ASTM D1557 so that pavement can be placed <br />promptly. Any pavement cut or area disturbed by this work shall be replaced to match <br />existing. <br />3.07 BACKFILLING OF TRENCH OPEN AREAS: The CONTRACTOR shall place material <br />in 12-inch maximum lifts after filling one foot above pipe as previously described. The <br />top one-foot layer shall be compacted to 95 percent maximum dry density as measured <br />by ASTM D1557. Each layer shall be compacted to the density of adjacent soils. <br />Restore the surface to original grade and place sod or seed as required by the contract <br />documents. <br /> <br />END OF SECTION