[CPEO-BIF] New Hampshire Vapor Intrusion Guidance

[Lenny Siegel]

In July, the New Hampshire Department of Environmental Services 
published its 49-page Vapor Intrusion Guidance as a 2 MB scanned PDF 
file. See
http://rs6.net/tn.jsp?t=ysbivybab.0.c8tkvybab.59frsobab.765&ts=S0207&p=http%3A%2F%2Fwww.des.state.nh.us%2Forcb%2Fdoclist%2Fpdf%2Fvapor_intrusion.pdf


Page 25 (page 30 of the PDF file) contains a table of screening levels. 
The  indoor air screening level for TCE is 1.1 micrograms per cubic 
meter - almost as protective as any state's since EPA withdrew its 2001 
draft Human Health Risk Assessment. The TCE soil gas screening level 
seems conservative at 54 micrograms per cubic meter, but the groundwater 
to indoor air screening level is an unprotective 50 parts per billion.

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 at cpeo.org>
http://www.cpeo.org