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asbestos -- Public Workshop to Discuss Potential Revisions to Method 435

Posted: 21 May 2008 15:33:53
The California Air Resources Board (ARB) staff invite you to
participate in the second workshop to discuss potential
revisions to Test Method 435  Determination of Asbestos Content
in Serpentine Aggregate.  This method is referenced by two ARB
asbestos airborne toxic control measures (for surfacing
applications and for construction, grading, quarrying, and
surface mining operations) that aim to limit public exposure to
naturally-occurring asbestos.  

Please note that staff are now proposing changes to two
additional areas: 1) field sampling in Method 435 and 2) changes
to the two asbestos airborne toxic control measures (ATCMs) that
will reflect changes to Method 435.

At the June 10, 2008 workshop, staff will present more refined
proposed changes to Method 435.  These changes will also include
preliminary ideas on modifications to the field sampling portion
of the method.  In all, the proposed changes are expected to
greatly reduce inter-laboratory variability in the determination
of asbestos content in rocks and soils and more accurately
reflect any asbestos levels of concern in the field.  In
addition, staff will present how the two asbestos airborne ATCMs
would change as a result of changes to 
Method 435.

The workshop notice can be found at: 

http://www.arb.ca.gov/toxics/asbestos/tm435/workshops/wrkshp2.pdf

Interested parties can follow activities related to this method
modification process at the Test Method 435 homepage:

http://www.arb.ca.gov/toxics/asbestos/tm435/tm435.htm  

You will receive another list serve notice when the workshop
agenda is posted on the homepage (approximately one week prior
to the workshop).  The agenda will include conference calling
instructions for those who want to participate but are unable
to
attend in person.

If you have questions about the public workshop or the method
modification process, please contact Rebecca Neumann at (916)
324-1145 or via email at rneumann@arb.ca.gov.

Thank you.

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