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Re: Sulfate bearing soil

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Mr. Cohen,

I would assume the chemistry is due to leachate from the debris you
mentioned.  Removing local soils would seem to be at best a temporary fix.
How do you see it?

I had a similar problem driving H-pile through an ash dump at a site
Missouri a few years back.  The best thing we could come up with is coating
the piles.


----- Original Message -----
From: JCohen <jccpc(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Thursday, July 01, 1999 1:42 PM
Subject: Sulfate bearing soil

> I recently had a soils test done for a propsective residence. The sulfate
> content came out at between .15 and .20 % by weight of soil, excpet for 1
> 9 samples which tested at 3.7%. I have asked the testing laboratory to
> confirm their results, as this was also sampled within 3 feet above and
> below other samples which tested at between the .15 and .20 %. The pH was
> also down on this single sample to 3.5, whereas the other samples were
> around 5.1 to 6.5. My question is: would it be enough to remove high
> content  locally from around the foundation without resorting to Type V
> cement with added pozzolans? Are there other methods to avoid sulfate or
> acid attack? If the test results are correct, and I hav enot reason to
> believe they are wrong, it also appears that the sulfate is not migrating.
> For information, there was a significant amount of debris found in the
> pits at 8 to 12 feet below the surface. The site was a former horse track
> with a pond, which was filled in. The locations of the track and pond are
> not known, but are likely to be in the vicinity of the pits. Safe bearing
> capacity has been estimated at 4500 psf.
> Thanks for any suggestions.
> James Cohen
> James Cohen Consulting, P.C.
> Website: