An underground pipe installation trench is excavated in undisturbed soil and topped with finish grade. The trench contains a pressure mainline located at the bottom, lateral lines, and control wires, all surrounded by clean compacted backfill. Dimensions indicate trench depth and clearance zones according to project specifications.
CLEAN COMPACTED BACKFILL C C C C C B A PRESSURE MAINLINE, SEE CONTROL WIRES, SEE SPECS. LATERAL LINES, SEE SPECS. SPECIFICATIONS UNDISTURBED SOIL FINISH GRADE
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