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TRENCHING & BACKFILL 02 2020-9 shall be adequately supported in place with walers and braces. Fill voids between sheathing and trench wall with pea gravel. B. Mandatory use of solid sheathing at designated locations shall not relieve the Contractor of the responsibility to install sheathing at other locations required or where necessary for safety of workmen or the general public. Excavations below Bay Mud shall be accomplished between previously placed sheathing and bracing in those areas where solid sheathing is required. The required bracing and sheathing will be installed prior to excavating below braced elevation. C. Material which is salvaged from the trench and stockpiled for later use as backfill, shall be stored a minimum distance of 10 feet, but no less than 3 times the trench depth from the edge of the excavation. D. Sheathing shall be withdrawn only after backfill above the pipe has proceeded to a height equal to or greater than 3/4 of the excavation depth. Bottom cross bracing and walers may be left in place upon removal of the sheathing. Backfill shall be brought to the level of the cross-braces before these are removed. E. Install and extract the sheathing in a manner which will not disturb the line, grade, backfill compaction or operation of the utility being installed or adjacent utilities and improvements. 3.07 SPECIAL REQUIREMENT FOR BACKFILL IN BAY MUD CONDITIONS A. Bay Mud, if used as backfill at the Contractor's option, shall be spread and dried to optimum moisture content, then replaced in the trench to the same elevation below grade as the existing Bay Mud, as directed. B. Imported fill material, which has been salvaged from trench excavation for use as select backfill, shall be stockpiled alongside the excavation unless otherwise directed. Material shall not be stockpiled higher than four (4) feet and shall be kept back from the trench a horizontal distance at least equal to the depth of excavation. C. All material excavated within the limits of work, not required as backfill, shall then be transported and dumped or conditioned to optimum moisture content and compacted as embankment at the site noted on the plans or as directed. D. On-site native Bay Mud for use as backfill shall be conditioned by means of watering or aeration as may be required to bring the material to the range of moisture content satisfactory for compaction to project specification. E. Prior to placing conditioned material as backfill, the material shall be thoroughly and uniformly mixed to the satisfaction of the Engineer, and the moisture content shall be within the allowable range for compaction to project specification. Material which has dried to less than allowable moisture content shall be reconditioned to an acceptable moisture content and re-mixed to the satisfaction of the Engineer.