Backfill in Ledge Trenches Clause Samples

Backfill in Ledge Trenches. Backfill around the pipe in ledge trench shall be either sand or fine gravel (6” below and 12” above the pipe), but in cases where corrosive conditions may prevail due to the type of ledge or other material which has been excavated, clay may be specified on the plans or by the Engineer. A complete clay dam shall be put in the backfill at least every 100’ along the trench where the surface gradient is greater than 3%.