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| Air Toxics Program >> Investigations & Area Studies | ||||
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| Air Toxics Program >> Investigations & Area Studies | ||||
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| Summary of Rule Amending the Hydrogen Sulfide Acceptable Ambient Level | ||||||||||
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| Updated March 15, 2006 | ||||||||||
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On April 1, 2005 a rule change became effective to reduce the hydrogen sulfide Acceptable Ambient Level (AAL) from 2.1 to 0.12 milligrams per cubic meter (or from 1,500 to 83 parts per billion) under 15A NCAC 2D .1104. Included in the rule were provisions to exempt paper mill wastewater treatment systems from the new hydrogen sulfide AAL, provided the paper industry submit the following information relative to their wastewater treatment systems:
A meeting was held between the paper industry and DAQ on January 17, 2006 to confront the data quality problems in the reports and discuss plans for conducting additional studies. DAQ concluded that most of the analytical data and resulting emission estimates in the Phase I reports to be unacceptable for the purpose of meeting 15A NCAC 2Q .0714. The US EPA also reviewed the reports and found the analytical data "questionable" bearing the same uncertainty as information existing before the study. In February 2006 the paper industry submitted their revised study plan (Phase II) with the proposed scope of work and analytical quality assurance procedures. DAQ found all but one proposed detail in their submittal acceptable, being firm that analyses must include dimethyl sulfide and dimethyl disulfide along with hydrogen sulfide and methyl mercaptan. Industry plans are to complete the Phase II monitoring study in time to submit emission estimates and dispersion modeling results by July 2006 according to the following schedule: |
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Progress report for the March 2006 Air Quality Committee Meeting [PDF] [Text] |
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Technical and Regulatory Information
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Toxicological Information
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Public Comments Received on Revising Hydrogen Sulfide Acceptable Ambient Level
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To view and print PDF files you must install the Adobe Acrobat reader. It is available, free of charge, from Adobe. |
Last Modified: Tue July 18 09:51:17 2006
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| North Carolina Division of Air Quality - 1641 Mail Service Center - Raleigh, NC 27699-1641 - (919) 733-3340 |