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Samson Oceanfront Park <br />City of Sunny Isles <br />Technical Specifications <br />TRENCHING, BACKFILLING AND COMPACTING 02221-3 <br />B. In the event unstable or unsuitable bedding material is encountered at or below the pipe bedding <br />level the CONTRACTOR shall removed such material and replaced with it suitable compacted <br />material. <br /> <br />3.05 <br /> <br />BACKFILLING TRENCHES: <br />A. The CONTRACTOR shall be responsible for obtaining the necessary inspections before, during <br />and after backfilling and shall re-excavate, refill and perform all such related work to obtain <br />satisfactory test results. <br /> <br />B. The CONTRACTOR shall use excavated materials classified as embankment fill for backfilling <br />and such grading on the site as is required. The CONTRACTOR shall dispose of any excess of <br />fill or unstable material in areas approved by the ENGINEER. Pipe trenches shall be backfilled <br />with fine, loose embankment fill (see SECTION 02220, paragraph 2.02), free from large stones, <br />carefully deposited on both sides of pipe and thoroughly and carefully rammed until enough fill <br />has been 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. The <br />CONTRACTOR shall submit written request detailing the need to perform water settling and <br />reasons why work in the dry is not possible. The CONTRACTOR shall also submit detailed <br />procedures for the review and approval of the ENGINEER. Whenever trenches have not been <br />properly filled, or if settlement occurs, they shall be refilled, smoothed off and finally, made to <br />conform to the surface of the ground. Backfilling shall be carefully performed and the surface <br />restored to the elevation shown on the plans. In unpaved areas the surface of trenches shall <br />conform and be equal to quality, character and material to the surface immediately prior to making <br />the excavation. <br /> <br />C. Place earth embedment as follows: <br />1. With level bottom layer at proper grade to receive and uniformly support pipe barrel <br />throughout its length. <br /> <br />2. Form shallow depression under each joint to facilitate jointing. <br /> <br />3. Add second layer simultaneously to both sides of the pipe with care to avoid displacement <br />of the pipe. <br /> <br />4. Place material in maximum 12-inch lifts. <br /> <br />3.06 BACKFILLING OF TRENCH UNDER ROADWAY AND AREAS TO BE PAVED: <br /> <br /> The <br />CONTRACTOR shall place material in 12-inch maximum layers after filling one foot above pipe as <br />previously described. Each layer shall be compacted to 95 percent maximum dry density as measured by <br />ASTM D1557 so that pavement can be placed promptly. Any pavement cut or area disturbed by this work <br />shall be replaced to match existing. <br />3.07 BACKFILLING OF TRENCH OPEN AREAS: <br /> <br /> The CONTRACTOR shall place material in 12-inch <br />maximum lifts after filling one foot above pipe as previously described. The top one-foot layer shall be <br />compacted to 90 percent maximum dry density as measured by ASTM D1557. Each layer shall be <br />compacted to the density of adjacent soils. Restore the surface to original grade and place sod or seed as <br />required by the contract documents. <br /> <br />END OF SECTION