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 STRUCTURAL
Swimming Pools-Continued
rust
corrosion
complete absence of paint
5.2.26 Tunnels and Underground Structures: Comply with all current safety
precautions. Check for:
n Portal Structures:
drainage defects
cracks
breaks
leaks in face and between face and tunnel lining
eroded slopes or undermining
n Wing and Face Walls:
inadequate protection to personnel
erosion of slopes
loose rocks
actual or potential slides
scouring or undermining of walls
n Door and Gate Operation and Locking Devices:
rust
corrosion
loose, missing or damaged parts
improper operation
n Concrete Floors:
cracks
breaks
scaling
other damage surface dusting
settlement
n Earth and Gravel Floors:
improper grading and drainage
5-46
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