Re: Explain these standards please - urgent

[Joseph R Parrish Jr <JoeParrish@compuserve.com>]

Neil,
I'll take a wack at this, off the top of my head:

1) particulates: what is GR/DSCF - grams per dry standard cubic foot (dry
air, not moist air)
2) what is ppmv? ppm = parts per million, but what's the v for?  - volume,
or a volume measurement
3) what does the oxygen percentage refer to? - relates to a standard gas
content of 7% oxygen I think
4) I assume that the alternatives (or xx reduction) refer to old plants
that are being upgraded. Is this correct? -this one I didn't get enough
info to answer, but  
what I think is meant is that the removal system should reduce SOX by 80
percent, and the HCl by 95 percent  from 
the concentrations in the input stream; this is an alternative to getting
below the limits shown, 30 or 25 ppmv, respectively--not 
an alternative I would espouse because of human health risk, but one the
EPA would accept as an operational factor.
5) on dioxins, why does it say ng/Nm3? shouldn't it be per cubic meter, not
cubic nanometer?  Perhaps the N is not nano, since n is usually nano; per
cubic meter sounds good to me; but check the 
number to see if nanograms per cubic meter is what is meant. One ppm would
be one gram per cubic meter I believe.  A billionth 
ppm would be one nanogram per cubic meter; seems like the measurement
should be parts per trillion or quadrillion, not million.  
It would be a fearsome thing to have 70 ppms of dioxins, I think, although
far more exists in some superfund sites;  
and most would say 70 ppt is way too high for human safety, I believe;
maybe parts per quadrillion would be about right;
that would be grams per million cubic meters according to my rough
calculations, but maybe someone else can tackle this one. 

Hopefully someone on dioxin-L can set us right.  I believe the EPA would
help interpret if you called them.  
Where I strongly disagree with the EPA is that combustors should ever be
used...  They are dangers to humans.  

Joe