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3) <br />specified herein shall be considered "minimum procedures" to prevent after -settlement <br />and the Contractor shall reopen, refill and recompact any trenches indicating improper <br />backfill procedures or after -settlement. <br />All road crossings shall be backfilled immediately, made passable and maintained <br />passable until the permanent repair is made. <br />b. All Other Areas Under Pavements - The initial lift shall consist of clean, fine, <br />select materials, not exceeding 3/4" in diameter under the haunches of the pipe. The <br />material shall be placed in layers not to exceed 4". The initial lift shall be manually <br />compacted to 95% of the maximum density as determined by AASHTO T-180. <br />Subsequent lifts to 12" above the pipe shall be constructed as specified for the initial <br />lift, except that had operated mechanical tampers may be used. Additional lifts from <br />12" above the pipe to the top of subgrade shall be carefully backfilled with material <br />free from organic material and stones or clumps exceeding 3 -inches (2 -inches in the <br />final 6 -final layer) in diameter, and compacted in 6 -inch layers to an average maximum <br />density of 95% as determined by AASHTO T-180. <br />C, Areas <br />Outside <br />of <br />Pavements - Backfill <br />of all <br />areas outside of pavements shall <br />be constructed <br />as specified above for "all other <br />areas <br />under pavements" except that the <br />additional lifts <br />shall be constructed as specified <br />to the <br />finished grade. <br />d. Density Testing - The Contractor shall arrange to have sufficient soil tests <br />made by an independent testing laboratory approved by the Engineer to demonstrate <br />conformance of his work with the stability and compaction levels required by these <br />specifications. Compaction tests shall be taken at intervals listed herein or as deemed <br />necessary by the Engineer. <br />In no case shall the Contractor proceed with construction over compacted material until <br />the tests prove satisfactory and approval is given by the Engineer. <br />In general, at least one test for maximum dry density/optimum moisture content shall <br />be performed on a representative sample of each inherently different material to be <br />used for compacted backfill or embankment fill. <br />As a minimum, in-place density tests shall be performed at the rate of one test location <br />per 200 lineal feet (or fraction thereof) of trench on the compacted backfill and under <br />each drive lane at all open cut, roadway crossings. Tests shall be taken in one foot lifts <br />beginning at one foot above the pipe and ending at the final grade. Test locations shall <br />be as directed by the Engineer or his authorized representative. If any test results are <br />unsatisfactory, the Contractor shall re -excavate and recompact the backfill, at his <br />expense, to the extent directed by the Engineer until the required compaction is <br />obtained. The cost of all proctor and density tests shall be the responsibility of the <br />Contractor and shall be included in the cost of installed and completed water main. <br />Installation of Trace Wire <br />02534 - 8 <br />02534- Sanitary Sewer Force Mains <br />