An underground trench detail showing a pipeline installation beneath existing pavement with a minimum eighteen inches of cover. The trench features a minimum width of twenty-one inches to allow for compaction of aggregate base and compacted backfill to ninety-five percent. A mainline or lateral line is encased in a sleeve sized at twice the pipe diameter alongside a conduit for control wires sized as needed. Pavement patching requires matching the existing surface and base, with sawcutting permitted only as a last resort.
TOP VIEW SCALE: ROTOR HEAD ASSEMBLY NO SCALE B NOTES: 1. CONTRACTOR TO DETERMINE METHOD OF SLEEVING PRIOR TO BIDDING. OPTIONS INCLUDE: USE OF EXISTING SLEEVE, USE OF EXISTING PIPE AS SLEEVE IF LARGE ENOUGH, BORING OF HOLE FOR NEW SLEEVE, OR SAWCUT AND PATCHING. 2. SAWCUTTING AND PATCHING OF EXISTING PAVEMENT SHALL BE A LAST RESORT AND REQUIRE APPROVAL FROM THE OWNER. IF SAWCUTTING IS REQUIRED IT SHALL NOT BE CONSIDERED ADDITIONAL SCOPE. TRENCH WIDTH 21" MINIMUM TO ALLOW FOR COMPACTION TO 95% AGGREGATE BASE COMPACTED BACKFILL PAVEMENT - PATCH SURFACE AND BASE TO MATCH EXISTING CONDUIT FOR CONTROL WIRES - SIZE AS NEEDED SLEEVE - SIZE SHALL BE PIPE SIZE X 2 18" MIN. MAINLINE OR LATERAL LINE 21" MIN. SAWCUT EXISTING PAVEMENT EXISTING PAVEMENT
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