MIL-HDBK-1025/10
...................................................................................................... PAGE
8.1
Underground Work ............................................................................. 105
8.2
Underground Work Area Protection.................................................... 105
8.2.1
Underground Work Area Protection Methods ..................................... 105
8.2.2
Impact of Vehicular Traffic Flow ........................................................ 105
8.2.3
Work Space Considerations ................................................................ 105
8.2.4
Barricades and Warning Precautions ................................................... 105
8.2.4.1
Devices ............................................................................................... 106
8.2.4.2
Flagmen .............................................................................................. 106
8.2.4.3
Barriers and Barricade Tape ................................................................ 106
8.2.4.4
Caution and Danger Signs ................................................................... 107
8.2.4.5
Manhole Work Areas .......................................................................... 107
8.2.4.6
Excavation, Trenching, and Backfilling................................................ 107
8.2.4.7
Cable Pulling Protection ...................................................................... 109
8.3
Existing Obstruction Protection........................................................... 109
8.3.1
Locating Buried Facilities.................................................................... 109
8.3.2
Direct-Burial Electrical Cable Work .................................................... 109
8.3.3
Digging Restriction ............................................................................. 110
8.3.4
Handling Damage To Existing Utility Lines ......................................... 110
8.4
Excavation Practices and Procedures for Damage Prevention .............. 111
8.4.1
Preplanning of the Excavation Project ................................................. 111
8.4.2
All Projects Preplanning ...................................................................... 111
8.4.3
Large Project Preplanning ................................................................... 111
8.4.4
On the Job Site Procedures ................................................................. 111
8.4.5
Excavating in Areas of Utility Locations.............................................. 112
8.4.6
Backfilling in Areas of Utility Locations .............................................. 113
8.4.7
If Damage Does Occur to Existing Utilities ......................................... 113
8.4.8
Accountability for Excavator Error ..................................................... 114
8.5
Preparation for Work in Underground Structures ................................ 114
8.5.1
Removing a Manhole Cover ................................................................ 114
8.5.2
Testing Before Entering Underground Structures ................................ 117
8.5.2.1
Hazardous Conditions in Underground Structures ............................... 117
8.5.2.2
Testers for Underground Structures .................................................... 117
8.5.2.3
Elimination of Combustible or Toxic Gases ......................................... 118
8.5.2.4
Structure Condition Change Retesting Requirements........................... 119
8.5.2.5
Emergency Entrance Into Underground Structures .............................. 119
8.5.3
Ventilation of Underground Structures ................................................ 119
8.5.3.1
Forced Air .......................................................................................... 119
8.5.3.2
Sail Method ........................................................................................ 119
8.5.3.3
Natural Method................................................................................... 119
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