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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 Outside of Pavements - Backfill of all areas outside of pavements shall <br /> be constructed as specified above for "all other areas under pavements" except that the <br /> additional lifts shall be constructed as specified to the 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 /> hi 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 /> 3) Installation of Trace Wire <br /> 02534- Sanitary Sewer Force Mains <br /> 02534 - 8 <br />