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' Compact backfill around structures with buried walls to 95 percent of <br /> maximum dry density. <br /> ' 2 . Grassed or unpaved areas - 95 percent of maximum dry density. <br /> 3 . Sidewalks , driveways and bike paths - 98 percent of maximum dry <br /> density. <br /> ' 4 . Paved areas and within 6 feet around the perimeter of paved areas - <br /> 98 percent of maximum dry density . <br /> 5 . Utility Trench Backfill : <br /> ' a . Pipe Bedding and Foundation - Compact the material below the <br /> bottom of the pipe barrel to 98 percent of maximum dry density for <br /> a minimum depth of 6- inches for the full width and length of the <br /> trench . <br /> b . Initial Backfill - Initial backfill is defined as the backfill from the <br /> trench bottom to 124ches above the top of the pipe . Compact to <br /> ' 98 percent of maximum dry density . <br /> C , Subsequent Backfill - Subsequent backfill is the backfill placed <br /> above the initial backfill . Compact to the limits denoted in <br /> ' paragraphs 3 . 11 . L . 1 , 2 , 3 , and 4 , as applicable . <br /> 6 . Manholes and Drainage Structures : <br /> a . Bottom of Excavation - Compact the material below the bottom of <br /> the excavation to 98 percent of maximum dry density for a <br /> minimum depth of 12 - inches for at least three feet beyond the <br /> structure perimeter. <br /> ' b . Backfill — Compact to the limits denoted in paragraphs 3 . 11 . L . 1 , 2 , <br /> 3 , and 4 , as applicable . <br /> ' M . If the specified densities are not obtained , perform whatever work is <br /> required to provide the required densities . This work shall include complete <br /> removal of unacceptable fill areas , and replacement and recompaction until <br /> acceptable fill is provided . <br /> N . After excavation fora structure is completed , notify the OWNER's Project <br /> ' Representative . No concrete or reinforcing steel shall be placed until the <br /> OWNER' s Project Representative has approved the depth of the excavation <br /> and the character of the foundation material . <br /> O . Fill/backfill slopes shall not exceed two horizontal to one vertical (2H : 1 V ) <br /> ' 3 . 12 SPECIFIC REQUIREMENTS FOR THE PLACEMENT AND COMPACTION OF <br /> BACKFILL AND FILL FOR UTILITIES <br /> A . In addition to the requirements of paragraph 3 . 11 , above , the following shall <br /> apply for the construction of utilities in trenches . <br /> Last revised 9/ 10/02 02220- 16 EAST GIFFORD <br /> RIPublic Works\KeithM\stop-nmter Projects\Gifford East\Construction Contract\Technical Specifications\Final Specifications\Division <br /> ' 2\02220 - Excavation and Backtll .doc <br />