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RE: Standard for Number of Required Borings?

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I've gotten this question several times and they also usually want me to specify where the borings should be taken. I have done this before (though I didn't really like it) and other structural engineers I know have done it too, I guess with the thought that if the geotech thinks that more borings are required then they will say that before giving a signed and sealed report for the site.

I think some input from structural may be good on location, since we know where the loads are highest and the most damage can occur from failure/settlement, even though this may be increasing my liability. But I don't like telling the number of borings required and don't see why I should be asked that.



Will Haynes, P.E.




From: "Lutz, James" <James.Lutz(--nospam--at)earthtech.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: seaint(--nospam--at)seaint.org
Subject: RE: Standard for Number of Required Borings?
Date: Wed, 9 Feb 2005 11:49:05 -0800

Ideally, this should be something the geotech is giving you. I've seen
different suggestions in textbooks for ordinary buildings.

Maximum spacing 50 ft (Seelye)

One boring at each corner (Peck)

One boring at each corner and one in the center preferred, but not less than
three (Bowles)

-----Original Message-----
From: Bill Allen [mailto:t.w.allen(--nospam--at)cox.net]
Sent: Wednesday, February 09, 2005 10:43 AM
To: seaint(--nospam--at)seaint.org
Subject: Standard for Number of Required Borings?


Is there criteria in specifying/recommending the number of borings required
for a particular project?

The project I'm looking at is approximately 8,000 SF, one story commercial
building.

I *think* the architect is asking me this because he is trying to get a fee
from the geotechnical engineer.

TIA,

T. William (Bill) Allen, S.E. (CA 2607)



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