Original General Order 128
Section
I
General Provisions
17.10
Backfill of
Excavations
Backfill containing large rock, paving material,
cinders, large or sharply angular substance, or corrosive material, shall not
be placed in an excavation where such material may damage ducts, cables, or
other substructures or prevent adequate compaction of the fill or contribute to
corrosion of the ducts, cables or other substructures. (See Appendix B, Figs.
5, 6 and 7.)