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STATE OF CALIFORNIA J GEORGE DEUKMEJIAN, Gorom., <br /> AIR RESOURVORD1102 O STREET n"P.O. eOX 2815 /-�fSACRAMENTO, CA 9S" '/Y J 0 <br /> 4F,Gt r/,JQ1)1 to <br /> AZ <br /> April 4, 1985 <br /> Dear Sir or Madam: <br /> Lists of Compounds tb be Considered Under AB 1807 <br /> A little over a year ago on January 26 , 1984 , the Air <br /> Resources Board held a public meeting to discuss its toxic air <br /> contaminant program established pursuant to Assembly Bill 1807 <br /> (AB 1807 ) . Included in the discussions at that meeting were the <br /> prioritization scheme developed by the ARB staff and the list of <br /> compounds prioritized under that scheme . We have always viewed <br /> the list of compounds as dynamic , subject to revision based upon <br /> new information as it becomes available . Over the past year , the <br /> ranking of some of the compounds on the list has been revised <br /> based on our review of available information.- This letter is to <br /> advise you of these changes . <br /> You may recall that the criteria used in the <br /> establishment of the prioritization scheme , taken directly from <br /> AB 1807, are: risk of harm to public health, amount or potential <br /> amount of emissions, manner of usage of the substance, <br /> persistence in the atmosphere, and ambient concentrations in <br /> California. Level 1 compounds are those judged to be of concern <br /> in California based on these criteria and for which sufficient <br /> information exists to pursue listing as a toxic air contaminant . <br /> Level' 2 compounds are those compounds which the ARB considers to <br /> be of potential concern in California . Level 1 compounds are <br /> further disaggregated into level lA and level 1B. Level lA <br /> compounds are those substances for which no significant <br /> additional information is outstanding . Level 1B compounds have <br /> either significant information or studies in progress related to <br /> the toxic air contaminant identification process . <br /> As we have indicated, the compounds have been under <br /> review and consequently the rankings have been updated and <br /> revised. Attached for your information are two new lists of <br /> compounds . List A contains all the compounds currently <br /> considered as potential toxic air contaminants (47 in all ) in <br />