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PDFWAC 296-36-060

General operating requirements—Bracing of working chamber, shafts and passageways.

The working chamber, shafts and passageways of tunnels and caissons shall be provided with bracing as may be necessary to safely resist any superimposed loads or any forces which may cause excessive deformation of the walls.
[Rules (Part III G), filed 12/28/62; § 19, filed 3/23/60.]
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