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4.3.8.5.(2)
OS1OH5
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Method of installation of underground reinforced plastic storage tanks for flammable liquids and combustible liquids.
Exceptions: 
except as exempted in Sentences 4.1.1.1.(2) and (3), which apply to unique hazards at process plants, in transportation, for oil burning equipment, on farms and isolated construction projects, and the storage of aerosol products.
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Intent
Intent 1: 
To limit the probability of damage to the tank shell and fittings, which could lead to premature failure of the tank, which could lead to the escape and spread of liquid, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons.
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