2003-118A.2 - Laserfiche WebLink

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' B . When using a shield for pipe installation , the bottom of the shield shall not . extend below the mid -diameter of installed pipe at any time . ' C . When using a shield for the installation of structures , the bottom of the shield shall not extend below the top of the foundation bedding for the structures . D . When a shield is removed or moved ahead , extreme care shall be taken to ' prevent the movement of pipe or structures or the disturbance of the bedding for pipe or structures . Pipe or structures that are disturbed shall be removed and reinstalled as specified . 3 . 9 PRE - BACKFILLING/ FILLING REQUIREMENTS ' A . Before placing fill or backfill the following must be completed : 1 . Observation and recording locations of underground utilities . 2 . Removal of all concrete formwork . 3 . Removal of all below grade shoring and bracing , and backfilling and properly compacting all voids with satisfactory materials . 4 . Permanent or temporary horizontal bracing is in place on horizontally supported walls . 5 . Placement of settlement plates . 6 . Acceptance by ENGINEER of construction below finish grade , ' including dampproofing and waterproofing . 7 . Removal of all trash and debris . 8 . Fill or backfill shall not be placed against concrete structures until they have attained their specified compressive strength . 9 . Prepare ground surfaces for buildings and roads to receive fill as follows : Remove all vegetation , debris , unsatisfactory soil materials , obstructions and deleterious materials from the ground surface prior to placement of fill . Plow or break- up sloped surfaces steeper than 1 vertical to 4 horizontal so that the fill material will bond with the existing surface . When the existing ground surface has a density less than that which will be required for the fill material , the ground surface shall be plowed , pulverized , and compacted to the density which the fill material ' is to receive . 10 . Compaction Requirements : As a minimum , compact the top 1400t of all areas that will require fill/backfill and compaction , to a minimum 98 percent of maximum dry density . Density tests shall be taken at the locations selected by the ENGINEER or his representative . ' 3 . 10 FIELD QUALITY CONTROL - REQUIRED DENSITY TESTS Last revised 9/ 10/02 02220- 12 EAST GIFFORD R\Public Works\KeithM\Stormwater Projects\Gifford East\Construction Contract\Technical Specificafions\Final Specificafions\Division ' 2\02220 - Excavation and Backill .doc