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two opposite sides of the structure , beginning at the bottom of the excavation and ending at finish grade . D . If any tests are unsatisfactory , the CONTRACTOR shall re-excavate and/or recompact the material at his expense , until the required density is ' obtained . 3 . 11 GENERAL REQUIREMENTS FOR THE PLACEMENT AND COMPACTION OF ' BACKFILL AND FILL A . Furnish , place and compact all backfill and fill material required for ' structures and trenches and to provide the finished grades shown and specified . Unless otherwise specified , material may be obtained from on -site sources . Additional materials , if required , shall be furnished from ' off-site sources in accordance with paragraphs 2 . 1 . C . and 2 . 1 . E . B . In general , spread and dump fill in horizontal loose layers not exceeding 12 . ' inches loose thickness . Within 5 feet of structures , the fill/backfill shall not exceed 6- inches loose thickness . Mix and spread the fill in a manner assuring uniform lift thickness after placing . Backfill around buried walls 1 should be placed in level lifts not exceeding 6 - inches loose thickness . During the process of dumping and spreading , remove all roots , debris , and stones greater than 1 - 1 /2 inches diameter from the fill areas . Assign a ' sufficient number of men to this work to insure satisfactory compliance with these requirements . C . If the compacted surface of any layer of material is determined to be too smooth to bond properly with the succeeding layer, loosen the surface before the succeeding layer is placed . ' D . All backfill and fill materials shall belaced and compacted " in -the-dry" . P P rY Dewater excavated areas as required to perform the work and in such manner as to preserve the undisturbed state of the natural inorganic soils . ' E . Place backfill and fill materials evenly adjacent to structures , to required elevations . Take care to prevent wedging action of backfill against structures by carrying the material uniformly around the structure to approximately the same elevation in each lift. F . Prior to the installation of pipes which are to be installed in fill or ' embankment sections , place the fill until a minimum height of 24eet above the pipe is reached , unless otherwise specified . The pipe trench shall then Last revised 9/ 10/02 02220- 14 EAST GIFFORD RIPublic Works\Keithmstorm ater Projects\Efford East\construction contract\Technical Specifications\Final Specifications\Division ' 2\02220 - Excavation and Backill .doc