In article ,
says...
On Mon, 23 Oct 2006 11:50:06 -0400, krw wrote:

In article ,
says...
On 21 Oct 2006 12:06:43 -0700, "mzm" wrote:

How effective is radon mediation when the house is testing at 9.7?

imho:

Each type has its own success ratio.

I found this, http://www.epa.gov/radon/pubs/consgu...l#installtable

it says subslab suction, low range it only 50% so you can get down to
4.85, which is still over the 4 action limit. So worse case it seems
that subslab suction will have to be used in conjunction with another
technique like sealing cracks and seams.

My raised ranch in NY had 12pCi/L radon in the basement. A sub-
slab pump brought it down to under 3pCi/L.

Doing simple math, that is right in the middle of the EPA's suggested
50-99% reduction.

Yep, I was told by the mitigation company that the test used would
likely show 2pCi/L if the unit was left outside.

Very nice.

Yep. Even nicer, it brought it under 4pCi/L so I could unload the
dump on the relocation company. ;-)

--
Keith