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exceeding 3 -inches (2-inches in the final 6-inch layer) in diameter, and mechanically compacted in 6-inch layers to an average maximum density of 100% as determined by AASHTOT-99 . ' c . All Other Areas Under Pavements - The initial lift shall consist of clean, fine , select materials , not exceeding 3 /4 " in diameter under the ' haunches of the pipe . The material shall be placed in layers not to exceed 4 " . The initial lift shall be manually compacted to 95 % of the maximum density as determined by AASHTO T- 180 . Subsequent lifts to 12 " above the pipe shall ' be constructed as specified for the initial lift, except that had operated mechanical tampers may be used. Additional lifts from 12 " above the pipe to the top of subgrade shall be carefully backfilled with material free from ' organic material and stones or clumps exceeding 34nches (2 -inches in the final 6-final layer) in diameter, and compacted in 64nch layers to an average maximum density of 95 % as determined by AASHTO T- 180 . d. Areas Outside of Pavements - Backfill of all areas outside of pavements shall be constructed as specified above for " all other areas under ' pavements " except that the additional lifts shall be constructed as specified to the finished grade . ' e . Density Testing - The Contractor shall arrange to have sufficient soil tests made by an independent testing laboratory approved by the Engineer to demonstrate conformance of his work with ' the stability and compaction levels required by these specifications . Compaction tests shall be taken at intervals listed herein or as deemed ' necessary by the Engineer. All test results shall be signed and sealed by a Florida Registered Engineer, and a copy provided to the Owner and Engineer. In no case shall the Contractor proceed with construction over compacted material until the tests prove satisfactory and approval is given by the Engineer. In general, at least one test for maximum dry density/optimum moisture content shall be performed on a representative sample of each ' inherently different material to be used for compacted backfill or embankment fill . ' As a minimum, in-place density tests shall be performed at the rate of one test location per 300 lineal feet (or fraction thereof) of trench on the compacted backfill, under each drive lane at all roadway crossings and at all significant ' changes in bedding and backfill material . Tests shall be taken in one foot lifts beginning at one foot above the pipe and ending at the final grade . Test locations shall be as directed by the Engineer or his authorized ' representative . If any test results are unsatisfactory , the Contractor shall re- excavate and recompact the backfill , at his expense, to the extent directed by the Engineer until the required compaction is obtained . The cost of all proctor and density tests shall be the responsibility of the Contractor and shall be included in the cost of installed and completed water main. CADownloadVechspec-02501 .doc SC501 - 10