How can I justify use of the Tier I Look Up Tables if the groundwater table at my site is less than the 3.0 metres below ground surface (BGS) used by Atlantic PIRI as the default condition?
In general, if site conditions do not match the Tier I default parameter assumptions, Tier II should be used. Nevertheless, Tier I subsurface soil criteria are conservative for groundwater depths less than 3 m below the building floor slab due to conservative modelling assumptions. If the groundwater is within 1 m of the slab, Tier II should be used to develop groundwater SSTLs.
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