February 19, 2010

Memorandum—the Chief Health, Safety and Security Officer's recommendation that the Under Secretary for Science approve a permanent variance (Variance 1021) from the Threshold Limit Values (TLV) for static magnetic fields in the American Conference of Governmental Industrial Hygienists (ACGIH) "2005 Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices."