Arsenic Acceptable Ambient Level Revision

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Presentation transcript:

Arsenic Acceptable Ambient Level Revision Joelle Burleson Department of Environment & Natural Resources Division Of Air Quality September 12, 2013

Acronyms AAL - Acceptable Ambient Level DENR - Department of Environment and Natural Resources DAQ - Division of Air Quality DWR - Division of Water Resources EPA – Environmental Protection Agency EMC - Environmental Management Commission IRIS – Integrated Risk Information System SAB - Science Advisory Board TAP- Toxics Air Pollutant TPER- Toxics Permitting Emission Rate

Background NC has a Health Risk Based State Air Toxics Program Establishes Acceptable Ambient Level (AAL) Guidelines and Emission Rates Requiring a Permit against which a Facility’s Emissions Impact to Ambient Air at or Beyond Property Boundary is Reviewed DENR Secretary’s Science Advisory Board (SAB) Studies Toxicological Effects of Toxic Air Pollutants (TAPs) and Advises EMC Regarding Necessary Level of Control for Protection of Human Health and Environment

Arsenic Acceptable Ambient Level (AAL) Revision Proposed Rule Revises Arsenic AAL from 2.3 x 10-7 mg/m3 to 2.1 x 10-6 mg/m3 Proposed Rule Revises Associated Emission Rate Requiring a Permit (aka TPER or Toxics Permitting Emission Rate) from 0.016 lbs/yr to 0.053 lbs/yr Request to Proceed to Hearing Approved by EMC March 14, 2013 Hearing 5-14-13 Comment Period Closed June 14, 2013

Arsenic Acceptable Ambient Level (AAL) Revision Hearing Officer’s Report Presented to EMC July 11, 2013 Recommending Adoption of Proposed Amendments EMC Members Raised Concerns: SAB Methodology – Use of Different Calculation Methodology vs. New Data Was Atmospheric Deposition and Ingestion Considered? Ongoing EPA Update of Integrated Risk Information System (IRIS) Arsenic values EMC Voted to Delay Action until September Meeting

Arsenic Acceptable Ambient Level (AAL) Revision Anticipate Action Item at November EMC Meeting SAB Representatives, DAQ Staff, DWR Staff Available to Respond to Questions July EMC Meeting Minutes Available at: http://portal.ncdenr.org/web/emc/agenda/2013/home Hearing Record Available at: http://portal.ncdenr.org/web/emc/july-11-2013 Potential Effective Date: January 1, 2014

Contact Information Joelle Burleson joelle.burleson@ncdenr.gov (919) 707-8720