Based on my previous knowledge, perchlorate is ubiquitous in groundwater,
although the sources are not always clear. It's used in dry cleaning, and
rocket fuel (slightly different forms I think!) but there seem to be other
sources. It may be a breakdown product of some other chemical(s). If I
remember correctly, it has also been found on Mars!
Mike Lazere
_____
From: Iowa Discussion, Alerts and Announcements
[mailto:[log in to unmask]] On Behalf Of Larry and Barbara
Spicer
Sent: Monday, September 22, 2008 3:18 PM
To: [log in to unmask]
Subject: Re: EPA may not limit perchlorate in tap water
I admit to my ignorance; why is this stuff in the water and why does the
gov't want to keep it there? B
_____
From: Iowa Discussion, Alerts and Announcements
[mailto:[log in to unmask]] On Behalf Of Neila Seaman
Sent: Monday, September 22, 2008 12:19 PM
To: [log in to unmask]
Subject: EPA may not limit perchlorate in tap water
From today's American Progress Action report:
ENVIRONMENT -- THE WHITE HOUSE PRESSURES THE EPA TO NOT LIMIT PERCHLORATE IN
TAP WATER: "Under pressure from the White House and the Pentagon," the
Environmental Protection Agency (EPA) "is poised to rule as early as today
that it will not set a drinking-water
<http://app.mx3.americanprogressaction.org/e/er.aspx?s=785&lid=9862&elq=9A03
87666363446FB9DF03F2CE3E3239> safety standard for perchlorate, a component
of rocket fuel that has been linked to thyroid problems in pregnant women,
newborns and young children across the nation," the Washington Post reports.
A near-final version of the EPA's "preliminary regulatory determination"
that the Post obtained "assumes the maximum allowable perchlorate
contamination level is 15 times what the EPA had suggested in 2002
<http://app.mx3.americanprogressaction.org/e/er.aspx?s=785&lid=9862&elq=9A03
87666363446FB9DF03F2CE3E3239> ." The proposal is "the final step in a
six-year-old battle between career EPA scientists who advocate regulating
the chemical and White House and Pentagon officials who oppose it."
Officials in the White House Office of Management and Budget (OMB) "heavily
edited" the document by eliminating key passages and asking the EPA to "use
a new computer modeling approach to calculate the chemical's risks." In
2004, the EPA's process for scientific risk assessments of chemicals was
altered to give OMB oversight of the program
<http://app.mx3.americanprogressaction.org/e/er.aspx?s=785&lid=4348&elq=9A03
87666363446FB9DF03F2CE3E3239> , which increased the ability of other
departments to interfere in the program secretly. Last spring, the
Government Accountability Office reported "that the Pentagon had pressured
the EPA for several years
<http://app.mx3.americanprogressaction.org/e/er.aspx?s=785&lid=9862&elq=9A03
87666363446FB9DF03F2CE3E3239> not to regulate perchlorate."
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