[CPEO-MEF] California goals for TCE and tritium

[Lenny Siegel <lsiegel@cpeo.org>]

Submitted by Peter Strauss <petestrauss1@comcast.net>

California has a Public Health Goal (PHG) that is “To-Be-Considered” in 
addressing Applicable or Relevant and Appropriate Requirements (ARARs). 
 For TCE in groundwater, the PHG was changed from 2.3 ppb to 0.8 ppb. 
This is assumed to be equivalent to an increased risk of 1 in a million 
excess lifetime cancers. This latter number was adopted by the Office of 
Environmental Health Hazard Assessment, and is in conformance with the 
State Implementation Plan.

Also of note is that California recently adopted a water quality 
objective (WQO) for tritium in groundwater of 400 Pico curies per liter 
(pCi/L). WQOs are modeled on a risk factor of 1x10-6 excess cancers. 
The MCL is 20,000.  This is relevant at sites such as Lawrence Livermore 
National Laboratory (LLNL) and other DOE sites where there is a debate 
on whether to clean up to WQOs or MCLs.



Peter
--


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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