From: Bill McClenney <WMcClenney@environcorp.com>
There are no PRGs for any contaminants in groundwater, so there is not
one for perchlorate. If I am wrong, please feel free to correct me. As
yet we have no national MCL for perchlorate, and I seem to remember
seeing here the announcement of Massachusetts' MCL a few months ago.
California may be on its heels with a Public Health Goal (PHG), a
preliminary step on the way to a state issued MCL.
William F. McClenney PG REA | Senior Manager | ENVIRON International
Corporation
[He's right. I assume that the researchers used the term PRG to refer to
whatever standard DOD is using for each contaminant. - LS]
Lenny Siegel wrote:
As part of the Defense Department's effort to understand its emerging
contaminants problem, the armed services conducted an occurrence
analysis of existing data, presented by Philip Hunter of the Air Force
Center for Environmental Excellence at the Partners in Environmental
Technology Symposium late last November. Hunter and his counterparts at
the Army and Navy reviewed groundwater and soil sampling data from 440
installations.
The most striking result was that trichloroethylene (TCE) has been found
in groundwater at 383, or 87% of those facilities. It was found above
the preliminary remediation goal (PRG) at 302 of those bases. Another
volatile solvent, tetrachloroethylene (PCE) was found above its PRG at
252 of the 440 installations. Napthalene, a key component of jet fuel,
was found above its PRG at 212 bases.
In some ways, the researchers' methodology exaggerates the military's
pollution problems. They reported sampling hits for substances that
often occur naturally, such as manganese and arsenic. Furthermore, the
high percentage of individual monitoring wells reporting TCE hits
resulted in part from the fact that a vast number of wells were sunk to
delineate known TCE plumes. On the other hand it's not surprising that
only 18 installations reporting finding perchlorate, above PRGs, in
groundwater. Historically, DOD facilities have rarely gone out looking
for perchlorate contamination.
Hunter's slides from the Symposium may be viewed at
http://www.serdp-estcp.org/Symposium/Technical/Wednesday-am.cfm
Just scroll down to Session 2B.
Lenny
--
Lenny Siegel
Director, Center for Public Environmental Oversight
c/o PSC, 278-A Hope St., Mountain View, CA 94041
Voice: 650/961-8918 or 650/969-1545
Fax: 650/961-8918
<lsiegel@cpeo.org>
http://www.cpeo.org
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