General Order 128

Section III

Requirements for Supply Systems

31     Duct Systems

Open trenching, tunneling, boring, jacking, plowing, and submersion in water, either singly or in combination, are among the recognized methods of installing duct systems.

31.1 Definition
31.2 Maintenance and Ispection
31.3 Construction
31.4 Clearance and Depths
31.5 Risers and Other Above-ground Terminations
31.6 Sealings Service Laterals