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-2- California divided into levels 1A, 1B and 2 . List B is_ an ordered list of the level lA compounds reflecting our current tentative order for processing compounds . Also included in List B for your information are the key dates of events for those compounds which have entered the AB 1807 process . Five revisions have been made to List A. Manganese has been moved to level 1B, ethylene oxide has been moved to level 1A, beryllium has been moved to level 2 , the hexavalent state indicator (VI ) has been removed from chromium and phenol has been expanded to include chlorinated phenols . Manganese , which prior to this revision had been in level 2, was moved because of its possible use in conjunction with particulate traps for diesel vehicles . This use of manganese could increase ambient concentrations of manganese in California . In addition, a study of the carcinogenicity of manganese is underway by the National Toxicology Program. Ethylene oxide, which was in level 1B, was moved to level lA because the Federal Occupational Safety and Health Administration. has significantly lowered its workplace standard from 50 parts per million (ppm) to 1 ppm. In addition , the Carcinogen Assessment Group of the Environmental Protection Agency has revised its carcinogenic potency estimate of ethylene oxide . The study this revision was based on has been interpreted to suggest a potency approximately 3 .6 told greater than previously considered in risk estimates by the California Department .of Health Services . Beryllium was moved down to level 2 from level lA based upon a re-evaluation of potential sources of emissions in California . There is currently little indication of use of beryllium in California . While beryllium is a NESHAPS substance, the lack of sources causes it to be appropriately placed in level 2 . Another change made to the list of compounds was the removal of the hexavalent state indicator (VI ) next to chromium. In the recent request to the Department of Health Services (DHS ) for evaluation of the health effects of chromium, the ARB rquested the DHS to evaluate all states of chromium, not only the hexavalent state . The final change made to the compounds in List A was the expansion of phenol to include chlorinated phenols . The ARB - believes this is prudent in consideration of the number of potential sources in California of chlorinated phenols .