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rma -- Agenda and Presentation Now Available – Workshop on Risk Management Guidance for Stationary Sources of Air Toxics

Posted: 15 Jun 2015 11:12:55
The agenda and staff presentation for the June 16, 2015 and June
18, 2015 public workshops on “Risk Management Guidance for
Stationary Sources of Air Toxics” are now posted.   This material
is available at:
http://www.arb.ca.gov/toxics/rma/rmaworkshops.htm

Background

On March 6, 2015, OEHHA released the Air Toxics Hot Spots Program
Risk Assessment Guidelines: Guidance Manual for the Preparation
of Health Risk Assessments.  This document contains the new risk
assessment methodology that addresses the latest scientific
information on childhood sensitivities and the most recent data
on childhood and adult exposure to air toxics.  It represents an
accumulation of data since the passage of the Children’s Health
Protection Act of 1999 (SB 25, Stats. 1999) which required OEHHA
to ensure infants and children are explicitly addressed in
assessing risk.  The use of the new risk assessment methodology
may result in higher estimated cancer risk than what would have
been calculated using the previous 2003 OEHHA risk assessment
methodology for the same level of emissions and conditions.  More
information on the new OEHHA methodology can be found at:
http://oehha.ca.gov/air/hot_spots/hotspots2015.html.  

In general, the higher estimated risks mean that new or modified
sources of toxics may need additional emissions control.  For
existing sources, even though they meet existing rules and
regulations, additional emissions control may be needed since the
higher estimated risk might now exceed the District’s risk
reduction levels for Hot Spots requirements.  ARB and Districts
are reevaluating their programs to determine if adjustments need
to be made to permitting, source specific regulations, or Hot
Spot programs.  The “Risk Management Guidance for Stationary
Sources of Air Toxics” is intended to help Districts with their
reevaluation process and to communicate ARB and Districts’ plans,
priorities, and policies regarding implementation of the new
OEHHA risk assessment methodology.  When approved, this document
will supersede ARB’s Risk Management Guidelines for New and
Modified Sources of Toxic Air Pollutants (1993).  In addition,
this document conveys ARB’s work plan for evaluating the Board’s
Air Toxics Program and provides the updated Risk Management
Policy for Inhalation Risk Assessments which replaces the ARB’s
Interim Risk Management Policy for Inhalation based Residential
Cancer Risk (2003).
 


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