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RE: Underground vault flotation

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I would not speculate on the water table.  The depth or rise of the water 
table is something that our contracts require the geotech to provide.  The 
Geotech may have some historical information to assist him in this 

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Will Haynes Sent: Tuesday, January 22, 2013 4:37 PM
To: seaint-seaosc(--nospam--at)
Subject: [SEAINT-SEAOSC] Underground vault flotation

If you have a site where the water table is not mentioned to be encountered 
 during the site soils investigation, would you typically go ahead and 
design an underground vault to resist flotation assuming the water table 
could rise later during the year (or at some point in the future) or would 
you design the vault without adding the additional concrete to resist the 
buoyancy uplift?

If you would design against flotation, at what level water table would you 
assume if the geotech has provided no information on this?

Will H

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