EPA 601/K-15/002 I September 2015 I www.epa.gov/research
United States
Environmental Protection
Agency
Human Health
Risk Assessment
STRATEGIC RESEARCH ACTION PLAN
2016-2019
Office of Research and Development
Human Health Risk Assessment
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EPA 601/K-15/002
Human Health Risk Assessment
Strategic Research Action Plan 2016 - 2019
U.S. Environmental Protection Agency
September 2015
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Table of Contents
List of Acronyms ii
Executive Summary 1
Introduction 2
Environmental Problems and Program Purpose 3
Problem Statement 5
Program Vision 5
Program Design 5
Research Program Objectives 12
Research Topics 17
Topic 1: Integrated Risk Information System (IRIS) 18
Topic 2: Integrated Science Assessments (ISAs) 20
Topic 3: Community and Site-Specific Analyses 22
Topic 4: Advancing Analyses and Applications 26
Anticipated Research Accomplishments and Projected Impact 32
Conclusions 34
References 35
Appendix A: Proposed Outputs, Human Health Risk Assessment Research Program, FY2016-19 37
Appendix B: Executive Orders and EPA Policies HHRA Supports 42
Appendix C: Research Program Partners and Stakeholders 43
Appendix D: Enhancements to IRIS Program 44
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List of Acronyms
ACE Air, Climate, and Energy Research Program
AOP Adverse Outcome Pathway
BMDS Benchmark Dose Software
CAAC Chemical Assessment Advisory Committee
CASAC Clean Air Scientific Advisory Committee
CRA Cumulative Risk Assessment
CSS Chemical Safety for Sustainability Research Program
EDSP Endocrine Disrupter Screening Program
HS Homeland Security Research Program
HTS High-throughput screening
IRIS Integrated Risk Information System
ISA Integrated Science Assessment
MCDA Multi-criteria decision analysis
MCL Maximum Contaminant Level
MIE Molecular Initiating Event
MOA Mode of action
MSD Multipollutant science documents
NAAQS National Ambient Air Quality Standard
NRC National Research Council
OAR Office of Air and Radiation
OSWER Office of Solid Waste and Emergency Response
OW Office of Water
PAL Provisional Advisory Level
PM Particulate matter
PPRTV Provisional Peer-reviewed Toxicity Values
RATE Risk assessment training and experience
RfC Reference Concentration (inhalation)
RfD Reference Dose (oral)
SAB Science Advisory Board
SHC Sustainable and Healthy Communities Research Program
SSWR Safe and Sustainable Water Resources Research Program
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Executive Summary
To protect human health and the environment, state, local and federal governments, and others,
must make daily decisions about the risks of exposures to environmental contaminants. EPA has
designed the Human Health Risk Assessment program to develop and apply state-of-the-science
risk assessment methods to estimate human health and environmental risks from exposures to
individual chemicals, chemical mixtures, and mixtures of chemicals and non-chemical stressors
to support and improve environmental decisions. This program identifies, evaluates, integrates,
and translates existing and emerging scientific information from diverse scientific disciplines to
accurately assess hazard and characterize risks.
This plan highlights how the HHRA program was developed with input from EPA program and
regional offices and from external sources, including nonprofit and research organizations, private
industry, and scientists from a range of disciplines across the academic community. The program
emphasizes stakeholder engagement to both inform the development of its assessment products,
as well as to gain feedback on the utility of products to users.
The HHRA program is designed to provide a comprehensive set of risk assessment products
and analytical approaches that will support a wide range of environmental management
decisions. The research objectives of the program are:
Objective 1: Characterize risks
Efficiently support a range of decision making with an agile, fit-for-purpose portfolio
of robust and responsive assessment products that characterize risks and potential
impacts to human health and the environment.
Objective 2: Advance and refine assessment approaches
Refine risk assessments by identifying critical issues and advancing analytical approaches
and applications to incorporate new science, methods and technologies.
Objective 3: Enhance and engage
Enhance data access and management systems to support transparency and efficiency;
provide outreach and engage stakeholders to ensure support, training, and tailoring of
assessment priorities and products.
To achieve these overarching objectives and address their respective scientific challenges, research
projects are organized into four topic areas: (1) Integrated Risk Information System (IRIS); (2)
Integrated Science Assessments; (3) Community and Site-specific Risk; and (4) Advancing Analyses
and Applications. In concert the topics provide priority assessment products, identify critical issues
as they arise, and develop or stimulate advances in approaches and solutions to address emerging
challenges, incorporate innovations, and continuously refine applications. Ultimately, this research
helps to ensure that risk-based decisions by federal, State, local, and tribal agencies and the public
to protect public health and the environment are based on reliable, transparent and high-quality
risk assessment methods, models, and data.
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Introduction
Every day, the U.S. Environmental Protection
Agency (EPA) and its diverse stakeholders
must make decisions to protect human
health and the environment from the known
or potential adverse effects of exposure to
environmental pollutants. Such decisions
span a large regulatory landscape and require
different degrees of environmental pollutant
risk information: developing health-protective
reference values to support air, water and
waste management programs; evaluating data
on chemicals provided in pre-manufacturing
notices; characterizing potential public and
environmental health impact during emergent
situations; screening and prioritization of
chemicals for monitoring at Superfund sites
and in the air and water; evaluating health and
ecological effects data to derive benchmark
estimates; and the interpreting and integrating
of different lines of evidence to support
decisions to establish, retain or revise national
pollutant standards. EPA's Human Health Risk
Assessment (HHRA) program is designed to
provide robust and responsive risk assessment
support to risk management decisions
aimed at protecting human health and the
environment. The HHRA program is the world
leader in providing both an essential portfolio
of risk assessment products and in undertaking
targeted and innovative methods development
to advance risk analysis.
This Human Health Risk Assessment (HHRA)
StRAP presents the strategic plan for this
national program to develop support to Agency
decision making and regulatory actions. The
HHRA plan is one of six research plans, one for
each of EPA's national research programs in
ORD. The six research programs are:
• Air, Climate, and Energy (ACE)
• Chemical Safety for Sustainability (CSS)
• Human Health Risk Assessment (HHRA)
• Homeland Security Research Program (HSRP)
• Safe and Sustainable Water Resources
(SSWR)
• Sustainable and Healthy Communities (SHC)
The HHRA plan articulates how this program is
integrated into the overall research portfolio
of the Agency's Office of Research and
Development (ORD), so as to most efficiently
and best apply that research to identify
hazards, characterize potential human health
and environmental risks, and to inform, engage,
and develop capacities of its assessment clients.
The 2016 - 2019 StRAP for the HHRA national
program was developed using considerable
input and support from partnerships with
EPA program and regional offices requiring
risk assessment products, as well as outside
stakeholders, nonprofit human health and
research organizations, private industry, and
colleagues across the scientific community
involved in human health and ecological risk
assessment.
EPA's strategic research action plans lay the
foundation for EPA's research staff and their
partners to provide focused research efforts
that meet the Agency's legislative mandates,
as well as the goals outlined in the Agency's
Fiscal Year 2014 - 2018 EPA Strategic Plan.
They are designed to guide an ambitious
research portfolio that at once delivers the
science and engineering solutions the Agency
needs to meet such priorities, while cultivating
a new paradigm for efficient, innovative, and
responsive government and government-
sponsored environmental and human health
research and scientific assessment.
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No other research organization in the world
matches the diversity and breadth represented
by the collective scientific and engineering staff
of EPA's Office of Research and Development,
their grantees, and other partners. They are
called upon to conduct research to meet the
most pressing environmental and related
human health challenges facing the nation and
the world.
Environmental
Problems and Program
Purpose
Decision making in the Agency and by its
stakeholders to protect public health and the
environment covers a large landscape of risk
assessment activities and requires agility to
bring the best available science and technologies
to inform those decisions in a fit-for-purpose
fashion. The purpose of the Human Health Risk
Assessment program is to develop and apply
state-of-the-science risk assessment methods
to estimate human health and environmental
risks from exposures to individual chemicals,
chemical mixtures, and mixtures of chemicals
and non-chemical stressors to support and
improve environmental decisions. The HHRA
program identifies, evaluates, integrates and
translates existing and emerging scientific
information from diverse scientific disciplines
to accurately assess hazard and characterize
risks.
The HHRA portfolio of assessment applications
ranges from rapidly estimating hazards for
screening and prioritization for further testing
and assessment, through development of
provisional assessments for site-specific cleanup
decisions, to extensively vetted assessments
in support of decisions on national standards.
Identifying critical issues and research needs,
as well as providing advances in analyses and
application of new data and tools, are critical
components necessary to keep assessment
products credible and contemporary with the
state of the science. The HHRA program is
uniquely positioned to advance new approaches
in support of the risk management decisions
and regulatory needs of various stakeholders,
including Agency program and regional offices
as well as state/tribal environmental protection
programs and interested communities.
The significant impact of the HHRA program
is demonstrated in the use of its assessment
products to support risk management efforts
and through recognition of its research
contributions. The recent Integrated Risk
Information System (IRIS) evaluation of the
health risks of inhaled Libby amphibole
asbestos is an example of the importance of
HHRA program efforts. Libby, Montana was
designated a Superfund site in 2002, and in 2009,
EPA determined that conditions in the town
constituted a public health emergency with
cleanup required at thousands of properties.
The IRIS assessment of Libby amphibole
asbestos involved novel approaches to estimate
cancer risks and it included the first evaluation
of non-cancer effects for asbestos material. The
completion of this IRIS assessment in 2015 has
provided scientific support to the EPA Office of
Solid Waste and Emergency Response (OSWER)
and Region 8 for the cleanup and related risk
management activities at the Libby Superfund
site.
Other HHRA program products, such as the
Integrated Science Assessments (ISA), provide
the scientific basis for setting the National
Ambient Air Quality Standards (NAAQS), which
arethe most impactful environmental standards
established by EPA. The ISA for Particulate
Matter (PM) evaluated thousands of studies
and was the basis in 2012 for the EPA decision
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to revise the PM NAAQS. The importance of
this scientific assessment is demonstrated by
the estimated net public health and economic
benefits of attaining the revised NAAQS, which
are estimated from $3.7 billion to $9 billion in
2020 (http://www.epa.gov/ttn/ecas/regdata/
RIAs/finalria.pdf).
Rapid assessment responses by the HHRA
program for several recent emergent
contamination situations also supported
swift and significant risk management
decisions that drew national attention. In
January 2014, scientists in the HHRA program
provided input on the drinking water health
advisory issued to address the spill of crude
4-methylcyclohexanemethanol into the Elk
River in Charleston, WV. HHRA scientists also
derived an inhalation screening level, and both
assessments supported emergency response
actions and guided remediation. HHRA
scientists also assisted EPA Region 2 at the
Reich Farms Superfund site in Toms River, NJ.
HHRA scientists developed a Provisional Peer-
Reviewed Toxicity Value (PPRTV) assessment for
Styrene-Acrylonitrile Trimer and subsequently
participated in a community meeting on
the final risk-based cleanup decision (to
protect both children and adults) based on
the provisional reference dose. The scientific
foundation for cleanup decisions at more than
1000 National Priority Sites across the country,
and for dozens of drinking water standards and
health advisory levels, has been based on IRIS
and PPRTV assessments.
Assessment activities such as these often
raise critical scientific issues and stimulate the
advancement of new methods and applications.
HHRA scientists are actively contributing to the
scientific community, as evidenced by the 2015
Best Paper in Toxicological Sciences Award that
they, together with CSS colleagues, received
for a joint publication on risk assessment
from the Society of Toxicology (SOT) Board of
Publications (Thomas et al., 2013).
As illustrated in Figure 1, the HHRA program
plays a pivotal role in the overall ORD research
portfolio by translating research of other
programs and characterizing its application and
utility in assessment activities. Additionally,
challenges encountered in the assessment
activities of the HHRA program identify
critical research needs and help to advance
the development of new applications both by
innovative analyses and methods development
by the HHRA program, as well as by stimulating
the broader scientific community to conduct
research that supports risk assessment. Often
assessments advance new areas of scientific
endeavor because challenges of interpretation
and insights on potential risks arise as
research results or new tools are applied and
characterized in context with data on human
exposure conditions, evaluation of other
endpoints, and consideration of lifestages and
other susceptibilities.
Figure 1. Position of HHRA Program (center red
oval) with Respect to Overall ORD Research Portfolio
and Agency Risk Management Activities. Information,
data, and tools developed in ORD partner research
programs are incorporated into HHRA assessment
products and approaches to support risk-based
decisions (information flow illustrated by left side
arrows), and insights on their utility or new challenges
identified in those applications inform new assessment
approaches and research areas (research needs
illustrated by right side arrows).
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Problem Statement
Every day, EPA and diverse stakeholders must
make decisions to protect human health and
the environment from the known or potential
adverse effects of a variety of exposures to
environmental pollutants. The wide range of risk
management decisions calls for risk assessment
products and analytical approaches that
tailor assessments to fit the purpose of these
various decisions. Assessment products must
be scientifically credible and contemporary
with evolving technologies, whether based on
very limited data or when integrating evidence
across thousands of sources.
Program Vision
Risk-based decisions by EPA, state/local/tribal
agencies, and the public to protect public health
and the environment are based on reliable,
transparent and high-quality risk assessment
methods, models, and data. The HHRA program
supports this vision by identifying, evaluating,
integrating, and applying relevant data from
a variety of scientific disciplines to characterize
the risk from exposures of individual chemicals,
chemical mixtures, and mixtures of chemicals
and non-chemical stressors. The assessments
generated by the HHRA program inform a
variety of risk management decisions, and serve
to identify critical scientific issues and advance
analytical approaches for their resolution.
Program Design
The HHRA program is comprised of four
highly interdependent and leveraged topics
that have been enhanced based on partner
and stakeholder involvement. In concert the
topics provide priority assessment products,
identify critical issues as they arise, and
develop or stimulate advances in approaches
and solutions to address emerging challenges,
incorporate innovations, and continuously refine
applications. The four topic areas, discussed in
more detail below, are as follows and the overall
program structure is represented in Figure 2:
• Integrated Risk Information System (IRIS)
to develop hazard and dose-response
assessments for priority chemicals;
• Integrated Science Assessments (ISAs)
to characterize the health and environmental
effects of criteria air pollutants and support
decisions to retain or revise the National
Ambient Air Quality Standards (NAAQS);
• Community and Site-specific Risk
to provide rapid response assessments
and cumulative risk methods to address
Superfund site assessment, emergency
response, sustainability, and community
concerns; and
• Advancing Analyses and Applications
to address science challenges affecting
hazard, exposure or dose-response analyses
and to incorporate scientific, technical and
communication innovations that improve
characterization of human and environmental
impacts and application of that science to
address critical environmental protection
needs.
Building on 2012-2016 Program
ThisStRAP builds upon and continues to ad-
vance the HHRA program as outlined in the
Human Health Risk Assessment Strategic Re-
search Action Plan, FY2012-2016. The 2016-
2019 StRAP responds to ongoing review and
oversight by the Chemical Assessment Advi-
sory Committee (CAAC) and the Clean Air Act
Science Advisory Committee (CASAC) of the
Agency Science Advisory Board (SAB), and has
been developed with consideration of recom-
mendations in a January 2015 report of a joint
review provided by the SAB and the Executive
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Stakeholder Engagement & Cross-Program Integration
Planning / Scoping and Problem Formulation
Advancing Analyses and Applications
Integrated
Risk
Information
System
(IRIS)
Integrated
Science
Assessments
(ISAs)
Community
and Site-
Specific
Risk
I
I
_[ Stakeholder Engagement & Cross-Program Integration
Evaluation / Outreach and Training
Figure 2. Structure of the Human Health Risk Assessment (HHRA) program. The program design starts
with problem formulation and scoping with stakeholders and other research programs (denoted in
grey module at top). Development of new methods of analysis and application of these advancements
into the portfolio of assessment products (IRIS, ISAs, PPRTVs, emergency estimates, etc., indicated
in the light blue block) results in identification of critical issues that inform and stimulate research
and new methods development. Evaluation of the utility of these activities feeds back to problem
formulation and scoping. Additionally, training and outreach activities enhance stakeholder
engagement and builds capacity in risk assessment communities for understanding and application
of new technologies and approaches.
Council of the Board of Scientific Counselors
(BOSC) held in July 2014 (U.S. EPA, 2015). The
HHRA program constantly evolves as its prod-
ucts are assessed for their utility in meeting
Agency needs as new scientific opportunities
arise and as new challenges and needs are
identified in the risk assessment and manage-
ment arenas. For example, the HHRA program
is developing new assessment approaches and
products based on computational tools devel-
oped via coordination with the CSS research
program. Likewise, emerging technologies such
as sensors will require guidance on analytical
considerations, interpretation, and application
in risk assessment approaches.
EPA Partner and Stakeholder
Involvement
The HHRA program was restructured in 2014 to
emphasize stakeholder engagement and cross-
program integration in order to both inform
the problem formulation of its assessment
products and methods development work,
as well as to provide feedback on the utility
of the results of these efforts to end users
as depicted in Figure 2. This initial "up front"
involvement of stakeholders in the design of
assessment activities was recommended by
the NRC report Science and Decisions (NRC,
2009). By implementing the recommendations,
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EPA greatly enhanced stakeholder engagement
throughout the IRIS program and was
subsequently recognized by the NRC (NRC,
2014). Such input on problem formulation
and on the scope of activities, including
prioritization and pacing, occurs in the HHRA
program via development and integration of its
projects and tasks with the other ORD research
programs, and in collaboration with HHRA
program partners and stakeholders. In addition,
the program is conducting scientific workshops
to convene experts and stakeholders to discuss
critical science issues and opportunities in
human health risk assessment. Further, the IRIS
program organizes public science meetings to
support problem formulation and to discuss the
available scientific evidence and issues early in
the assessment development process. Recently,
EPA arranged with the NRC to identify and
arrange for subject matter experts to contribute
to these meetings, to assure a well-informed
discussion that sets the stage for well-targeted
and efficient assessment development.
Activities conducted under the HHRA program
are responsive to the priorities and the needs
of EPA's program and regional offices (see
Appendix C for a list of HHRA partners and
stakeholders). The HHRA program conducts
regular meetings with its program partners.
One of HHRA's regular planning partner
meetings for two sequential years was devoted
to development of the HHRA 2016-2019
StRAP with particular focus on two of its topic
areas, Community and Site-specific Risk and
Advancing Analyses and Applications. Initial
proposals to address critical science challenges
were discussed at a large planning meeting
with program partners in May 2014, and then
a revised portfolio of projects and a draft StRAP
were reviewed at another one in March 2015.
This document represents further refinement
based on additional comments. The large-
scale planning meetings are complemented by
regular partner meetings and communications
that occur throughout the year.
Also included in HHRA outreach is its risk
assessment training and experience (RATE)
program comprised of over 30 specific modules
covering hazard identification, exposure
assessment, dose-response assessment,
benchmark dose modeling, PBPK modeling,
mixtures guidance and cumulative risk
assessment. These training modules have been
provided internally to EPA program and regional
offices, to various states, and internationally.
Further, the HHRA program has worked with
the Environmental Council of the State's
(ECOS) Interstate Technology and Regulatory
Council to develop a risk assessment training
program that targets state risk assessors,
increasing capabilities and consistency in risk
assessments conducted by federal, state and
tribal organizations.
The HHRA program components receive tens
of thousands of webpage views annually by
users, and substantial outreach occurs using
email listservs. Many thousands subscribe to
the HHRA Bulletin and over 500 to the ExpoBox
Bulletin. Thousands more also subscribe to
receive important updates for the IRIS program
and Benchmark Dose Software (BMDS).
Integration across the Research
Programs
HHRA integrates with the other National
Research Programs through collaboration on its
assessment activities, including incorporation of
research results and by characterization of new
applications of data and tools. As illustrated in
Figure 3, examples of HHRA program integration
with the other research programs include the
following:
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Impacts of nitrogen
and sulfur oxide
deposition
Safe and
Sustainable
Water
Resources
(SSWR)
Air, Climate
and Energy
(ACE)
Support on ISAs
Advancing sensor technologies
Well-being indices
considered in CRA
Community-based CRA
Exposure assessment
and apportionment
EPA's
Human Health
Risk Assessment
Research Program
(HHRA)
Chemical
Safety for
Sustainability
(CSS)
Computational toxicology
Applying adverse outcome
pathways (AOP)
Dosimetry21: Development and
update of models for translation
Sustainable
and Healthy
Communities
(SHC)
V W
Homeland
Security
(HS)
Rapid assessments for
emergency response
Resilience indices considered in
CRA
Figure 3. Integration of Human Health Risk Assessment (HHRA) research program with other ORD research
programs. The HHRA program utilizes research and applies tools in its assessment products as well
as develops assessment approaches and methods to inform needs in the other programs.
Air, Climate, and Energy (ACE)
Incorporation of NAAQS research (including
climate as a welfare effect) and understanding
multipollutant mode of action into ISAs; IRIS
assessments of air toxics;
Chemical Safety for Sustainability (CSS)
Computational toxicology, applying adverse
outcome pathways, and dosimetry;
Homeland Security Research Program
(HSRP)
Incorporation of resiliency into cumulative
risk assessment methods and coordination
on rapid response assessment;
Safe and Sustainable Water Resources
(SSWR)
Assessment of deposited oxides of nitrogen
and sulfur on surface water quality; and
• Sustainable and Healthy Communities (SHC)
Development of Cumulative Risk Assessment
(CRA) methods and decision analytic soft-
ware to provide "place-based" community
assessment, link health and ecology impacts
to well-being, and support multi-criteria deci-
sion assessment (MCDA).
The HHRA program has a specific integration
area with the CSS program to characterize the
application and utility of the tools and data
streams being developed by CSS scientists. This
collaboration is intended to enhance under-
standing of the foundational data and computa-
tional techniques involved in the development
of new tools so that they can be appropri-
ately applied in various risk assessment prod-
ucts. Characterizing the utility of these higher
throughput data and computational tools in
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the context of various assessment activities will
facilitate understanding and build confidence
in their application to various qualitative and
quantitative fit-for-purpose risk assessment
needs, thereby accelerating acceptance of new
approaches by the EPA program offices and re-
gions as well as external stakeholders. Applying
high-throughput screening (HTS) data may en-
hance efficiency of rapid assessment for emer-
gency response. Incorporating mechanistic in-
sights and understanding of adverse outcome
pathways (AOP) and virtual tissue descriptions
in the CSS program can inform dose-response
analysis for key events along the spectrum of
pathogenesis represented in a hypothesized
mode of action (MOA) for a given chemical
assessment. Updating dosimetry models will
facilitate response analysis and translation of
diverse data types at various levels of observa-
tion.
The HHRA program also informs critical research
areas identified in the ORD cross-cutting
Research Roadmaps, as depicted in Table 1.
HHRA program products are incorporated
across all of the roadmaps: the ISA projects
are evaluating the role of criteria pollutants
on climate forcing; evaluation of lifestage
susceptibility and approaches to assessment
are integral to children's health; and cumulative
risk assessment methods form the conceptual
basis for understanding key biological, social,
spatial, and environmental factors and how
they contribute to disproportionate risk of
concern to environmental justice.
HHRA assessment activities are also integrated
and coordinated with other interagency
working groups and collaborative relationships
through the National Center for Environmental
Assessment (NCEA), in which the HHRA program
represents the large majority of resources.
NCEA currently has two Memoranda of
Understanding (MOU), one with the Agency for
Toxic Substances and Disease Registry (ATSDR),
and a second with the National Institute for
Table 1. Human Health Risk Assessment (HHRA) research program contributions to critical needs
identified by ORD roadmaps. The number of checkmarks indicate the relative size of the contribution
of HHRA activities and interest in the identified science gaps of the roadmaps; a blank indicates no
substantive role. As indicated, HHRA is not the lead research program for any of the ORD roadmaps,
but its topic areas provide significant contributions to each of them.
ORD Roadmap
Climate Change
Environmental Justice
Children's Health
Nitrogen & Co-Pollutants
CSS Topic Area
IRIS
Assessments
S
S
V
ISA
Assessments
v'V
S
SS
ss
Community
and Site-
specific Risk
S
V
s
Advancing
Analyses and
Applications
S
S
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Occupational Safety and Health (NIOSH).
An additional MOD with the Food and Drug
Administration (FDA) is nearing completion.
Close relationships and integration also occur
with international organizations dealing with
environmental health risks including the World
Health Organization (WHO), the International
Agency for Research on Cancer (IARC) and the
United Nations Environment Programme. NCEA
has targeted efforts through a cooperative
agreement with WHO to specifically collaborate
on evaluation of priority chemicals in the
ISA and IRIS programs. Further, NCEA has the
lead role for EPA in the WHO Chemical Risk
Assessment Network, a cross-organizational
coordinating group including the International
Programme on Chemical Safety (http://www.
who.int/ipcs/en/).
Access to data for use in risk assessments is
facilitated by scientific staff networks with
other federal agencies conducting primary
environmental health research, particularly
at the National Institutes of Health - National
Institute of Environmental Health Sciences
(NIEHS) and National Toxicology Program (NTP)
and at the Centers for Disease Control and
Prevention's National Center for Environmental
Health. The HHRA program also continues to
improve its use of information science tools
to improve the efficiency and transparency of
its assessment activities and the accessibility
of its scientific resources, including both the
Integrated Risk Information System (IRIS,
http://www.epa.gov/iris/) and the Health
and Environmental Research Online (HERO)
database (http://hero.epa.gov/).
Research to Support EPA Strategic
Plan
In support of EPA's mission to protect human
health and the environment, the Agency's
Strategic Plan identifies five strategic goals and
four cross-agency strategies (Figure 4).
As described in the later section, the accom-
plishments and projected impacts of the HHRA
program address all of the Strategic Goals in the
FY2014-2018 EPA Strategic Plan. These include
Goal 1, "Addressing Climate Change and Im-
proving Air Quality"; Goal 2, "Protecting Ameri-
ca's Waters"; Goal 3, "Cleaning Up Communities
and Advancing Sustainable Development"; and
Goal 4, "Ensuring the Safety of Chemicals and
Preventing Pollution." The HHRA program also
supports the cross-agency strategies within this
plan, specifically "Working Toward a Sustain-
able Future" and "Making a Visible Difference
in Communities."
EPA Strategic Plan (FY2014-2018)
Goals and Cross-Agency Strategies
EPA Strategic Goals
Goal 1: Addressing Climate Change and
Improving Air Quality
Goal 2: Protecting America's Waters
Goal 3: Cleaning Up Communities and
Advancing Sustainable Development
Goal 4: Ensuring the Safety of Chemicals and
Preventing Pollution
Goal 5: Protecting Human Health and the
Environment by Enforcing Laws and
Assuring Compliance
Working Toward a Sustainable Future
Working to Make a Visible Difference in
Communities
Launching a New Era of State, Tribal, Local,
and International Partnerships
Embracing EPA as a High-Performing
Organize
Figure 4. FY 2014-2018 EPA Strategic Plan:
Goals and Cross-Agency Strategies.
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Statutory and Policy Context
As a regulatory agency, Congress authorizes
EPA to write regulations that explain the critical
details necessary to implement environmental
laws. In addition, a number of Presidential
Executive Orders (EOs) play a central role in EPA
activities. A comprehensive list of these laws
and EOs can be found at http://www2.epa.gov/
laws-regulations/laws-and-executive-orders.
A selection of the laws for which the HHRA
program helps to support the EPA's statutory
authority and mandates to conduct work
is shown below. The HHRA program also is
responsive to and supports several EOs and EPA
policies. See Appendix B for details.
• The Clean Air Act section 103 mandates that
EPA conduct a national research and develop-
ment program for the prevention and con-
trol of air pollution. The 1990 Amendments
further require EPA to set National Ambient
Air Quality Standards (NAAQS) (40 CFR Part
50) for criteria pollutants considered harm-
ful to public health and the environment on
a 5-year cycle and mandate the determina-
tion of risks from mobile, area, and major
sources of air toxics. The Integrated Science
Assessments (ISAs) that are developed under
the HHRA program serve as the basis for deci-
sions on NAAQS by the Agency's Administra-
tor.
• The Safe Drinking Water Act authorizes
research and assessments focusing on mi-
crobes (e.g., Cryptosporidium), disinfec-
tion byproducts, and other regulated and
unregulated chemical and radiological con-
taminants such as arsenic, sulfate, and ra-
don. The law also mandates that risks are
quantified for general and sensitive popu-
lations (e.g., infants, children, pregnant
women) as part of benefit-cost analysis
when Maximum Contaminant Levels (MCL)
are established. Other research provisions
address risks associated with waterborne
disease, complex mixtures and unregulated
contaminants (e.g., development of the
Contaminant Candidate List).
The Comprehensive Environmental Re-
sponse, Compensation, and Liability Act of
1980, commonly known as Superfund, re-
quires research, development, and training
to improve EPA's scientific capability to assess
effects and characterize risk to human health
and the environment from hazardous sub-
stances.
The Federal Insecticide, Fungicide, and Ro-
denticide Act provides for federal regulation
of pesticide distribution, sale, and use. All
pesticides distributed or sold in the United
States must be registered (licensed) by EPA.
Before EPA may register a pesticide, the ap-
plicant must show, among other things, that
using the pesticide according to specifica-
tions "will not generally cause unreasonable
adverse effects on the environment" typically
characterized by health and environmental
risk assessments.
The Resource Conservation and Recovery
Act gives EPA the authority to control hazard-
ous waste from "cradle to grave," including
the generation, transportation, treatment,
storage, and disposal of hazardous waste.
Evaluating control technologies requires
health and environmental assessments. The
law also sets forth a framework for the man-
agement of non-hazardous solid wastes. The
1986 amendments enabled EPA to address
environmental problems that could result
from underground tanks storing petroleum
and other hazardous substances.
The Food Quality Protection Act of 1996 re-
quires assessment of risk from exposures to
pesticides, including aggregate exposures
-------
and cumulative risk and risk to sensitive
subpopulations (e.g., infants and children).
• The Toxic Substances Control Act of 1976
provides EPA with authority to require
reporting, record-keeping and testing
requirements, and restrictions relating to
chemical substances and/or mixtures.
Research Program
Objectives
The three main HHRA program objectives sup-
port the vision of protecting public health and
the environment by providing state-of-the-
science risk assessments; refining risk assess-
ment approaches and advancing innovative
applications; and providing stakeholder en-
gagement and support by promoting transpar-
ency, efficient access to tools and products, and
training to enhance understanding and build
capabilities. The three objectives of the HHRA
program listed below are mutually informative
and integrated in order to most efficiently iden-
tify, evaluate, characterize and communicate
science-based solutions to address current and
emerging challenges in human health and envi-
ronmental risk assessment.
Objective 1: Characterize risks
Efficiently support a range of decision making
with an agile, fit-for-purpose portfolio of robust
and responsive assessment products that
characterize risks and potential impacts to
human health and the environment.
Objective 2: Advance and refine assessment
approaches
Refine risk assessments by identifying critical
issues and advancing analytical approaches
and applications to incorporate new science,
methods and technologies; and
Objective 3: Enhance and engage
Enhance data access and management systems
to support transparency and efficiency; provide
outreach and engage stakeholders to ensure
support, training, and tailoring of assessment
priorities and products.
The following narratives for each program
objective provide a brief overview of the
objectives and the critical assessment issues
and key drivers. Each objective addresses
broad scientific challenges that are intended to
enable EPA scientists to apply their expertise
and innovation in shaping specific solutions.
Objective 1: Characterize risks
Efficiently support a range of decision making
with an agile, fit-for-purpose portfolio of robust
and responsive assessment products that
characterizes risks and potential impacts to
human health and the environment.
The first objective is to continue to provide state-
of-the science, peer-reviewed assessments
and associated technical support activities for
the Integrated Risk Information System (IRIS)
used by various program offices, development
of Integrated Science Assessments (ISAs) and
Multipollutant Science Documents (MSD) to
support review of the National Ambient Air
Quality Standards (NAAQS), and Provisional
Peer-Reviewed Toxicity Value (PPRTV)
assessments for decision making at hazardous
waste sites. The priorities for these products are
described below (see Research Topics section).
Oversight is provided by established standing
scientific committees such as the Agency's
Chemical Assessment Advisory Committee
(CAAC) of the Science Advisory Board (SAB) for
IRIS assessments and the Clean Air Scientific
Advisory Committee (CASAC) of the SAB for the
ISAs.
-------
The following challenges must be addressed in
orderto meet Objective 1 and sustain the HHRA
program's assessment portfolio representing
the state-of-the science:
Science Challenge 1: Systematically identify,
evaluate, integrate, and translate relevant
scientific evidence to assess human health effects
of chemicals for priority Agency decisions;
Science Challenge 2: Systematically identify,
evaluate, integrate, and translate relevant
scientific evidence to assess human health and
environmental impacts of criteria air pollutants;
and
Science Challenge 3: Provide tools and advance
analyses to help EPA programs and communities
rapidly identify and address risks of emerging
exposures and prioritize testing.
Objective 2: Advance and refine assessment
approaches
Refine risk assessments by identifying critical
issues and advancing analytical approaches
and applications to incorporate new science,
methods and technologies.
The HHRA program is uniquely positioned to
characterize the appropriate use of new tools
and approaches to risk assessment. The HHRA
product portfolio spanstherangefrom screening
or prioritization, across rapid assessments
for emergency response or relatively data-
poor derivations in the PPRTV program, to
the evaluation of highly sophisticated and
data-rich studies and evidence integration
for the Integrated Science Assessments (ISA)
supporting the National Ambient Air Quality
Standards (NAAQS) as depicted in Figure 5.
The varying regulatory requirements relate to
the type and extent of foundational scientific
evidence, the prognostic capacity of a given tool,
and the degree of verification or confidence
in the application of new data or in a newly
measured key event to serve as a surrogate
versus established endpoints and outcome
measures in assessments. The application of
emerging data and new biotechnology tools
will be characterized in that context, and their
relative contributions and utility may differ
depending on the specific assessment arena
- i.e., fitting the application of the new data
to the purpose or problem formulation of the
assessment activity. Objective 2 of the HHRA
program is thus aimed at continuously refining
risk assessment approaches and advancing
new analyses that incorporate emerging
technologies to ensure that HHRA assessment
products keep contemporary with the state-of-
the-science.
Critical issues identified through the
assessment development efforts that are the
focus of Objective 1 support identification and
prioritization of the research foci of Objective 2
in the HHRA program. HHRA also avails itself of
advances and strives to address issues that arise
as challenges in the larger scientific community
in applying emerging biotechnology. The list of
challenges for Objective 2 of the HHRA program
includes the following:
Science Challenge 1: Evaluate and implement
approaches for systematic review, evaluation
and integration of evidence, including factors
affecting bias, to enhance efficiency and
accuracy of assessment development including
automated data mining;
Science Challenge 2: Broaden exposure
assessment technology with exposure factors
for translation of exposure, bioavailability, and
dose estimates (both human and ecological) to
flexibly address different exposure scenarios;
Science Challenge 3: Improve prioritization and
rapid response by evaluating and incorporating
new data streams and developing rapid
assessment approaches;
Science Challenge 4: Develop approaches to
incorporate current understanding of key events,
AOP, and biomarkers to increase accuracy of
predictions of disease pathogenesis; inform Mode
of Action (MOA); and better characterize critical
endpoints of relevance to HHRA (respiratory,
cardiovascular, neurotoxicity, developmental,
reproductive toxicity, liver);
-------
Science Challenge 5: Update dosimetry model-
ing approaches to predict a profile of internal
dose metrics, including portal-of-entry effects,
across all exposure routes to support use of
MOA, AOP and aggregate or cumulative risk ap-
plications;
Science Challenge 6: Advance decision ana-
lytic and probabilistic approaches to more fully
characterize dose-response functions and un-
certainty, and thereby better inform benefit-cost
analyses;
Science Challenge 7: Refine dose-response
analysis by characterizing determinants of the
entire spectrum of the response surface includ-
ing concentration, duration, and timing to sup-
port exposure-scenario specific assessment and
consideration of life-stage; and
Science Challenge 8: Expand cumulative risk
assessment methods to advance "place-based"
community risk characterizations, apportion
multimedia exposures and risk to various recep-
tors, incorporate multiple stressors, consider epi-
genetics and susceptibility, and support multi-
criteria decision analysis and sustainability.
Risk Assessment Application Range
Prioritization and
Screening
EDSP, PMN
Provisional and
Reference Values
PPRTV, PALS, HA, RTR
RfV, unit risks/CSF, ROD
National
Standards
NAAQS,
MCL
.2 o
Regulatory requirements
Evidence consensus
3
— u
.
< Q
Degree of Verification
Data specificity
Predictive Capacity
Computational Strategy
Tools & Data
ToxCast
AOP & Biomarkers
PBPK/BBDR
Virtual tissues
Mining / Abstraction '
Directed Model Structures
Hazard ID
Dose-response analysis
Extrapolations
Multipollutant integration
MCDA
Assessment Acronyms: EDSP = Endocrine disrupter screening program; PMN = premanufacturing notice; PPRTV = Provisional
peer-reviewed toxicity value; RfV = Reference value (e.g., reference dose); CSF = Cancer slope factor; PALS = Provisional advisory
levels; RTR = Residual technology review; HA = Health advisory; ROD = Record of decision; NAAQS = National Ambient Air Quality
Standard; MCL = Maxiumum contaminant level
Figure 5. Range of application dimensions required across risk assessment landscape varies based on "fit for purpose."
Figure 5 illustrates the range in critical dimensions for regulatory requirements, scientific evidence, predictive capacity,
and degree of verification required of applications across the assessment landscape. This ranges from screening
and prioritization to support of national standards (see insert for assessment acronyms). The type of computational
strategy employed, such as data mining/abstraction or read-across approaches versus directed model structures (e.g.,
physiologically-based pharmacokinetic, PBPK; or biologically-based dose-response, BBDR; models), also shifts along
this axis. The domain and role of specific tools and data (illustrated for products of the CSS program) may be different
depending on the assessment context. As an example, adverse outcome pathways (AOP) or biomarkers might both identify
a hazard or inform mode of action (MOA) considerations for dose-response analyses. Ultimately, all components can be
incorporated into multi-criteria decision analysis (MCDA) for transparent integration and evaluation of risk and uncertainty.
-------
Objective 3: Enhance and engage
Enhance data access and management systems
to support transparency and efficiency; provide
outreach and engage stakeholders to ensure
support, training, and tailoring of assessment
priorities and products.
The third objective of the HHRA program
is aimed at continual improvements in
technologies supporting efficient assessment
development and at outreach to improve
understanding of risk assessment issues and
methods in order to foster development of
institutional capabilities and consistency in risk
assessments developed by various stakeholders.
Further development and improvement
of the Health and Environmental Research
Online (HERO) system (www.epa.gov/HERO)
supports enhanced assessment development
and transparency through access to scientific
literature underlying assessment products.
Software and technical support such as BMDS
enables stakeholders to apply advances that
the HHRA program develops in dose-response
and evidence integration approaches. Outreach
efforts can take the form of public workshops,
seminars, training sessions as well as varied
communication approaches (e.g., Web posting,
emails, and blogs). Challenges in this objective
area include the following:
Science Challenge 1: Enhance data access and
management systems to support transparency
and efficiency; and
Science Challenge 2: Develop and apply effective
methods for stakeholder engagement and risk
assessment training to varied audiences.
An overview summary of the aims in the HHRA
research program, both near- and longer-
term, to achieve these objectives and address
critical science challenges is provided in Table 2.
Table 2. Summary of Near and Long-term HHRA Program Aims to Achieve Objectives and
Address Science Challenges
Objective
What We Do
Near-term Program
Aim
Long-term Program
Aim
Characterize risks —
Efficiently support a
range of decision making
with an agile, fit-for-
purpose portfolio of
robust and responsive
assessment products
that characterize risks
and potential impacts to
human health and the
environment
Tailor risk
assessment products
to meet the range of
assessment needs
in an agile, fit-for-
purposefashion
while maintaining
established
credibility and
scientific quality
and increasing
productivity
Accelerate
completion
of the current
successful array
of risk assessment
products for
priority pollutants
and program
partners while
updating operating
procedures for
evidence integration
and derivation
efficiency;
implement updating
process for older IRIS
assessments
Expand assessment
products to ensure
an efficient and
agile portfolio that
addresses critical
areas of assessment
needs, including
characterization
of acute, short-
term and episodic
exposures; integration
of endpoints across
species to support
community concerns
regarding cumulative
risk and sustainability;
and to develop
information to support
benefit-cost analyses
for a larger array of
endpoints
-------
Objective
Advance and
refine assessment
approaches — Refine
risk assessments by
identifying critical
issues and advancing
analytical approaches
and applications
to incorporate new
science, methods and
technologies
Enhance and engage —
Enhance data access and
management systems
to support transparency
and efficiency; provide
outreach and engage
stakeholders to ensure
support, training, and
tailoring of assessment
priorities and products
What We Do
Characterize and
advance assessment
approaches with
contemporary
and emerging
biotechnology data
and computational
methods
Provide system
infrastructure and
manage access
to assessment
products and data/
knowledge bases to
ensure transparency
and efficiency
while developing
stakeholder
engagement and
building capacity to
support appropriate
implementation of
new approaches
Near-term Program
Aim
Facilitate the
characterization
and application of
new data streams
and emerging
computational tools
by developing and
advancing case study
applications of new
science across the
exposure-dose-
response continuum
for various disease
endpoints; improve
assessment
methods including
systematic review
and approaches to
exposure and dose-
response
Maintain and
expand current risk
assessment tools
and databases to
incorporate new
approaches as they
are developed;
develop and provide
risk assessment
training to EPA
programs and
national and
international
partners
Long-term Program
Aim
Transition risk
assessment
approaches to
incorporate systems
biology understanding
of disease, implement
mature computational
toxicological modeling
approaches, express
risk and uncertainty
probabilistically, and
integrate emerging
sensor technologies
Evolve and upgrade
infrastructure to
create connectivity
and provide
interoperable, modular
computational
capacity to implement
new approaches,
access data sources,
engage stakeholders,
and support training
and communication
-------
Research Topics
Three of the four topic areas in the HHRA
research program are devoted to developing
specialized assessment products. The fourth
topic is an overarching topic area which informs
all assessments by advancing risk analyses and
applications. The program is highly integrated
and leveraged. As shown in Figure 6, nine
project areas are targeted so that those projects
involved with assessment activities identify
issues and methods development needs, while
the project areas to advance analyses and
applications bring the state-of-the-science to
maturity by providing characterizations and
building confidence, thereby ensuring agile
analyses and applications.
The HHRA National Program Director, in
consultation with ORD senior managers,
prioritizes efforts by balancing direct program
support with advancement of new risk
methods. The bulk of HHRA resources support
Projects 1 through 5, which provide assessment
products directly to EPA programs and regions,
thus addressing the program partners' highest
priorities. To maintain the credibility of these
assessments and increase the efficiency of
their production, both near- and longer-term
1.
2.
IRIS
Assessments
IRIS Update
3. Integrated Science
Assessments and
Scientific/Regulatory
Support
5.
6.
Provisional Peer-reviewed
Toxicity Values
Site-specific and Superfund
regulatory support
Cumulative risk assessment
methods and applications
7. Advancing hazard characterization and dose-response methods
8. Applying emerging science to inform risk screening and assessment
9. Risk assessment support and training
Figure 6. The four topic areas and nine projects of the Human Health Risk
Assessment (HHRA) research program.
-------
commitments to Projects 6 through 9 are
required to advance risk assessment methods,
incorporate emerging scientific developments
and maintain critical infrastructure such
as databases. Limited resources currently
available to the HHRA program require the
targeting of tasks within Projects 6 through
8, which is accomplished by considering the
value and impact of new analyses and methods
on HHRA assessment products, as well as the
status of complementary research efforts by
the other national programs, notably CSS,
which provides input to some tasks in Project
8, and SHC, which collaborates on community-
based approaches. Project 9 advances program
efficiency and transparency (e.g., via the Health
and Environmental Research Online [HERO]
system), provides software for use of new
approaches in the public domain, and supports
the Agency and external risk assessment
training efforts. HHRA in-house staffing,
availability of extramural resources, Agency
and Congressional direction, and independent
advisory recommendations (e.g., EPA's SAB
and BOSC) also are considered in decisions
on resource allocation to HHRA activities. The
following section summarizes key activities and
illustrates anticipated products arising from the
resources committed to the HHRA program.
Topic 1: Integrated Risk Information
System (IRIS)
Integrated Risk Information System (IRIS)
assessments developed by HHRA scientists are
peer-reviewed, qualitative, and quantitative
health hazard and dose-response assessments
on environmental pollutants of relevance to
EPA's mission to protect human health and the
environment (http://www.epa.gov/iris). IRIS
assessments are widely used by EPA's programs
and regions, as well as outside of the Agency
by states, international organizations and the
public, to support a wide range of decisions.
EPA and the risk assessment/risk management
community consider IRIS the premier source of
health hazard and dose-response information
for environmental pollutants.
Project 1: IRIS Assessments
This HHRA project is devoted to maintaining
the credibility and responsiveness of the IRIS
program. A strong, scientifically rigorous IRIS
program is of critical importance, and the HHRA
research program continues to make changes
that: (1) improve the scientific integrity of IRIS
assessments; (2) improve the productivity of
the IRIS program; and (3) increase transparency
so that issues are identified and debated early
in the IRIS process. In 2009, the IRIS program
announced a revised 7-step assessment
development process shown in Figure 7. Since
that time, the National Research Council made
recommendations related to improving the
development of IRIS assessments and advancing
risk assessment in general, including the
importance of up-front planning and scoping in
the risk assessment process (NRC, 2011). EPA
is implementing additional changes to the IRIS
program based on the NRC recommendations
(Appendix D) and an evaluation of these
changes has been well received (NRC, 2014).
These changes will help EPA produce more high
quality IRIS assessments each year in a timely
and transparent manner to meet the needs of
the Agency and the public.
PROJECT 1 HIGHLIGHTS
IRIS Assessments
IRIS assessments produced with state-of-the
science to address Agency priorities
Enhanced production efficiency and stakeholder
engagement
Public science meetings
Problem formulation opportunities
IRIS Handbook of Operating Procedures
to support transparent and tractable methods
-------
Identify Pertinent
Studies
t
Evaluate Study
Methods
and Quality
Evidence Evaluation
and Integration
for Each Effect
t
[Select Studies for
Deriving Toxicity
Values
Derive Toxicity
Values
Comprehensive Literature
Search and Data Call-In
Completed lit se
Web and announced in FRN
FRN requesting information about
studies not in lit search and new
research
[ Internal Agency Review
and EPA Clearance of
Final Assessment
EPA-led Interagency
Science Discussion
Science feedback on final
assessment from other Federal
Agencies and White House offices
Complete Draft IRIS
Assessment
Revise Assessment
Address peer review and public
comments: prepare response to
comments document
Post Final
Assessment on IRIS
Includes IRIS surnmaiy.
Toxicological Review and
response to comments
Internal Agency Review
Science Consultation on the
Draft Assessment with other
Federal Agencies and White
House Offices
EPA coordinates Interagency review
'independent Expert Peer
Review, Public Review and
Comment, and Public
Listening Session
Draft assessment and peer revievj
charge posted on Web site
Public comment period and Listening
Session announced in FRN
Peer review meeting announced in
FRN
Figure 7. Seven steps in assessment development process of IRIS program and work flow of
disciplinary work groups (denoted as green boxes).
Disciplinary Work Groups
Work Flow:
Identify Pertinent Studies
(Next)
Evaluate Study Methods
and Quality
(Next)
Evidence Evaluation
and Integration
for Each Effect
(Next)
Select Studies for
Deriving Toxicity
Values
(Next)
Derive Toxicity Values
Assessment Development Process of IRIS program:
Comprehensive Literature Search and Data Call-in.
Completed lit searches posted on Web and announced in FRN.
FRN requesting information about studies not in lit search and new research.
Step 1: Complete draft IRIS assessment
Step 2: Internal Agency review
Step 3: Science consultation on the draft assessment with other federal agencies and White
House offices. EPA coordinates interagency review.
Step 4: Independent expert peer review, public review and comment, and public listening
session. Draft assessment and peer review charge posted on website. Public comment
period and listening session announced in FRN. Peer review meeting announced in FRN.
Step 5: Revise Assessment. Address peer review and public comments. Prepare response
to comments document.
Step 6a: Internal Agency review and EPA clearance of final assessment.
Step 6b: EPA-led interagency science discussion. Science feedback on final assessment
from other federal agencies and White House offices.
Step 7: Post final assessment on IRIS. Includes IRIS summary, toxicological review and
response to comments.
Supplemental Figure 7 formatted to meet Section 508 standards.
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The formation of disciplinary work groups is
another enhancement to the IRIS program
that ensures scientific expertise is strategically
targeted to characterize potential adverse
health effects and endpoints. HHRA scientific
experts in these work groups identify issues
and advance approaches to address challenges
specific to their areas. For example, techniques
are under development for meta-analysis of
epidemiological studies and the use of AOP
to help elucidate windows of susceptibility
for developmental effects. The IRIS program
is also developing a Handbook of Operating
Procedures to provide transparency and
enhance understanding of IRIS assessments by
Agency partners and external stakeholders.
Project 2: IRIS Update
This project will update the existing IRIS
database and implement plans to maintain
its currency. During the past two decades, the
IRIS program has focused on a relatively small
number of scientifically complex, resource-
intensive assessments. This has left the rest
of the IRIS database untouched, to the point
that today, more than 80% of the hundreds of
IRIS assessments are more than 20 years old.
Even recent assessments can become out-
of-date as new studies become available and
scientists understand more about the many
ways chemicals can affect human health.
This situation is not unique to IRIS, rather,
it is common to human health assessment
programs worldwide.
PROJECT 2 HIGHLIGHTS
IRIS Update
Process to prioritize and update
IRIS assessments
Streamlined approach to update
older assessments
EPA remains committed to continue to
strengthen the IRIS program and increase
transparency and productivity. The IRIS
program has developed a multi-year agenda,
which provides information about the status of
active assessments and highlights assessments
scheduled to begin in the future (www.epa.
gov/IRIS). The program is working to improve
the IRIS database including an effort to evaluate
chemical assessment needs both within and
outside of EPA and the resources required to
meet those needs. Further, the program is
developing a process to update and maintain
finalized IRIS assessments that do not warrant a
full reassessment through the IRIS process.
Topic 2: Integrated Science
Assessments (ISAs)
The HHRA program regularly develops ISAs
(formerly Air Quality Criteria Documents) as
a major component of its research portfolio
(http://www.epa.gov/ncea/isa/). The ISAs
are developed on a 5-year cycle in response
to regulatory requirements and provide the
scientific basis for the EPA Administrator's
decisions on setting NAAQS for the criteria
pollutants (particulate matter, ozone, lead,
carbon monoxide, and sulfur and nitrogen
oxides) that are ubiquitous in ambient air
due to numerous and diverse mobile and
stationary sources. Attainment of the NAAQS
for these pollutants has been estimated by the
Office of Management and Budget (OMB) and
EPA to provide significant public health and
environmental benefits to the American public
that far exceed the cost of control programs.
The direct benefits of EPA's air programs include
the reduced incidence of a number of adverse
human health impacts, including premature
death and disease, improvements in visibility
and avoided damage to trees, agricultural crops
and other vegetation.
-------
In planning and developing ISAs, the HHRA
program works in very close collaboration with
the primary client office, the Office of Air and
Radiation's (OAR) Office of Air Quality Planning
and Standards (OAQPS), as well as the Clean
Air Scientific Advisory Committee (CASAC)
and other stakeholders as shown in Figure 8.
ORD's Air, Climate, and Energy (ACE) research
program conducts intramural laboratory-based
research and extramural research through
the Science to Achieve Results (STAR) grants
program in support of ISA development. The
ISAs incorporate and synthesize research
findings from the ACE research program and
others into the assessment documents. Early
in the development process, HHRA convenes a
workshop with the client office and the scientific
community to identify the most policy-relevant
science issues. A draft integrated review plan
for each ISA is then developed that includes the
ISA which is the responsibility of HHRA, and the
complementary Risk and Exposure Assessment,
if warranted, and a Policy Assessment, both
of which are the responsibility of OAQPS. All
external review drafts of these complementary
assessment products undergo public comment
and rigorous peer review by the CASAC. In
addition, draft ISAs are reviewed internally and
through workshops covering specific scientific
areas of the assessment.
Workshop on
science-policy issues
Integrated Review Plan (IRP): timeline and key
policy-relevant issues and scientific questions
Integrated Science Assessment (ISA): evaluation and
synthesis of most policy-relevant studies
Risk/Exposure Assessment (REA):
quantitative assessment, as warranted, focused
on key results, observations, and uncertainties
Policy Assessment (PA): staff analysis of
policy options based on integration and
interpretation of information in the ISA and REA
Public hearings
and comments
on proposal
Agency decision
making and draft
proposal notice
Agency decision
making and draft
final notice
Clean Air Scientific
Advisory Committee
(CASAC) review
Public comment
Figure 8. Development process and role of Integrated Science Assessments
in support of decisions to retain or revise the National Ambient Air Quality
Standards for the criteria air pollutants.
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Project 3: Integrated Science Assessments
and Science/Regulatory Support
Tasks in this project support these efforts
of planning, developing the ISAs, providing
regulatory support regarding their implementa-
tion, and advance specific scientific approaches
and solutions to issues that arise. In this next
FY2016-2019 period, the HHRA program ex-
pects to be supporting ISA and regulatory sup-
port to the Office of Air and Radiation (OAR)
regarding the final promulgation on the SO2 pri-
mary (health) and NO2 primary (health) NAAQS
in FY18 and the secondary (welfare) NAAQS in
2019 for SO2and NO2, while also initiating de-
velopment of the ISA for PM. Support to OAR
regarding implementation of ISA to policy as-
sessment and rulemaking for decisions regard-
ing review, retention, or revision of the NAAQS
will also be provided for these same pollutants.
A more detailed schedule of ISA activities can
be found in Appendix A.
The evaluation of data and development of
these ISAs often identify issues that the HHRA
program endeavors to resolve. For example,
recognizing that individuals are not exposed
to a single pollutant in isolation but rather to
a complex mixture of air pollution, HHRA and
ACE scientists have planned to work in consul-
tation with EPA offices to develop multipollut-
ant science documents (MSD) to support the
reviews of the primary (health-based) and sec-
ondary (welfare-based) NAAQS. These MSD are
intended to aid in evaluation of the combined
health effects of the exposures to mixtures of
air pollutants, as well as providing a more ef-
fective evaluation of health effects of exposures
to single pollutants in a multipollutant context
than what is currently provided using single
pollutant ISAs. Such understanding supports
strategic roadmaps regarding climate, address-
es environmental justice (EJ) issues, informs
understanding of MOA for respiratory effects,
and advances cumulative risk-characterization
methods. At present, budget constraints have
delayed development of MSDs but, as resourc-
es permit, the development of these assess-
ments will proceed.
Science advancements also derive from the ISA
assessment activities such as an approach to
the determination of causality for the toxicity
of lead (Pb) used coherence of the MOA across
human and ecological species (Lassiter et al.,
2015). Additional advancements on applying
insights from data evaluations in support of the
other ISAs are anticipated.
PROJECT 3 HIGHLIGHTS
ISA Assessments and Scientific/
Regulatory Support
ISA assessments for S02, N02, PM and
NOX/SOX ecological effects
Regulatory support to OAR regarding
rule development and risk/exposure/
policy assessment
Advances in application of new science
to characterize critical effects and
interactions of criteria pollutants
Topic 3: Community and Site-Specific
Analyses
Significant progress in environmental protection
has occurred in the United States over the
past decades, but many challenges remain,
and some communities are disproportionately
impacted. While many environmental problems
are global, national and regional in nature,
their impacts are experienced most acutely at
the community level. For example, every day,
communities face challenges with management
of municipal and hazardous waste. The HHRA
-------
program directly supports risk management
decisions related to waste sites through
development of Provisional Peer Reviewed
Toxicity Value (PPRTV) assessments.
Project 4: PPRTV Assessments
PPRTV assessments provide toxicity values
derived for use in EPA'sSuperfund program when
a value is not available in the IRIS database. The
PPRTV assessments are used by the Superfund
program and regional decision makers when
making site-specific cleanup decisions, such as
when to pursue monitoring for a contaminant
of concern. The implications of these decisions
include improvements in human health in the
vicinity of Superfund sites, reduction or reversal
of damages to natural resources, reduction
of harm in emergency situations, improved
economic conditions and quality of life in
communities affected by hazardous waste sites,
improved environmental practices by industry,
and advances in science and technology.
PROJECT 4 HIGHLIGHTS
PPRTV Assessments
> 12 assessments annually to support
OSWER regulatory decisions
Implementation of improvements in
systematic review and application of
other analysis advances as they
become available
Application of new data streams and
computational methods as utility is
characterized by case studies
Priorities for PPRTV development are based
on the needs of the Office of Solid Waste and
Emergency Response (OSWER) and evaluated
annually. PPRTV assessments are derived
following a review of the relevant scientific
literature using the same methods, sources of
data, and guidance on dose-response analysis
used by the IRIS program. All PPRTVs receive
internal review by a panel of EPA scientists and
external peer review by independent scientific
experts and are publicly available (http://
hhpprtv.ornl.gov). Applying new data streams,
read-across approaches, and computational
tools to enhance the supporting data/
knowledge bases and efficiency of derivation
for PPRTV values is an active area of research in
the HHRA program.
Project 5: Site-specific and Superfund
Technical Support
Communities are also faced with an urgent
need for coordinated assistance to assess
and address issues of chemical and other
environmental contamination, and additionally
are now presented with new sensing or
monitoring information that is difficult to
interpret. EPA's HHRA program is frequently
called upon to quickly assist in these situations,
often in the face of large scientific uncertainties
due to data gaps. Project 5 is structured with
tasks to address these needs.
EPA provides rapid risk assessment and
technical consultation regarding both health
and ecological impacts through five technical
support centers, two of which are supported
by the HHRA program: the Superfund
Technical Support Center and the Ecological
Risk Assessment Support Center1. The HHRA
program provides such support directly to the
Homeland Security research program as the lead
for the Agency on emergency contamination
situations. The HHRA program develops
approaches to respond to these emerging,
often crisis-level, chemical/substance issues
'The other three technical support centers, the Ground Water Technical Support Center, the Engineering Technical
Support Center, and the Site Characterization and Monitoring Technical Support Center, are supported by ORD's
Sustainable and Health Communities (SHC) research program.
-------
with sound science that allows for quick action
and, ultimately, quick decisions and effective
solutions. The HHRA program anticipates
developing new assessment approaches by
means of an expanded product line to enhance
rapid response and screening capabilities and
to augment toxicity value derivation procedures
for health assessments.
PROJECT 5 HIGHLIGHTS
Site-specific and Superfund
Technical Support
Quarterly reports on support
provided via the technical support
centers
Rapid assessment support to
emergent situations
Special assessment assignments as
novel Agency priorities arise
New assessment products to rapidly
predict risk
Project 6: Cumulative Risk Assessment
Methods and Applications
To address the desire by communities to
understand and conduct local or "place-
based" assessments, another major project
area of research under this topic is expanding
cumulative risk assessment (CRA) methods,
developed to integrate and evaluate impacts
of chemical and non-chemical stressors on the
environment and health, as shown in Figure
9. Current CRA activities includes strategic
coordination and science support to the EPA's
Risk Assessment Forum Technical Panel on
CRA (http://www.epa.gov/raf/) and providing
training on CRA methods.
Understanding the various key biological, so-
cial, spatial, and environmental factors and
how they contribute to disproportionate risk
will facilitate support on environmental justice
and faster application to communities. Specific
analyses and case studies are anticipated to
continue and will advance approaches useful to
both qualitative and quantitative consideration
of cumulative risks (Gallagher et al., 2015).
Analyses will look at specific interactions, in-
cluding PM and decreased heart rate variabil-
ity, access to green space with asthma and al-
lergy occurrences, and psychosocial stress with
chemicals that alter the hypothalamic pituitary
adrenal (HPA) axis. Other case studies may in-
clude scenario-specific studies in collaboration
with regional partners. A new task is devoted
to consideration of approaches to incorporate
susceptibility and the role of epigenetics. Evalu-
ation of exposure modeling and guidance on
how to apportion exposure and risk of mixtures
to phthalates and to both human and ecological
receptors in various media is another task an-
ticipated to help advance application of cumu-
lative risk assessment. A forthcoming vision pa-
per will provide recommendations to advance
CRA to include ecological assessment using
multi-criteria decision analysis (MCDA) to sup-
port transparency in valuation. Another case-
study will explore implementation of a model
that explores factors influencing sustainability.
PROJECT 6 HIGHLIGHTS
Cumulative Risk Assessment (CRA) Methods
• Advance cumulative risk methods to
characterize interactions of chemical and
non-chemical stressors
- Scenario-specific case studies to explore
CRA implementation
~> Development of approaches for the integration
of ecological and human endpoints using
multi-criteria decision analysis (MCDA)
Consideration of susceptibility and
epigenetics
Evaluation of exposure and risk apportionment
across media
-------
Future work with the HSRP and SHC programs
is expected to consider how to integrate
resiliency and well-being indices under
development in those programs into the CRA
framework. Research and work supporting CRA
is central to advancing the EPA Risk Assessment
Forum's CRA Guidelines, and will position the
HHRA program to better address place-based
assessments activities and thereby support
sustainability, climate, and goals articulated in
the Environmental Justice roadmap.
Byproducts (Showering)
£
Jr
Emissions,
jr Disinfection
Sources of Toxicants
i
Soil/Sediments
Source Water,
Combustor Deposition
]
Ingested S
Local
Drinkim
Overall Level of
Vulnerability
Vulnerability Factors / Buffers
• Access to health care
• Crime rates
• Proximity of homes to
pollutant sources
• Socio-economic status
• Diet/nutrition
• Access to recreational facilities
• Social support networks
Environmental
Stressors
Physiological
Background
Biological & Genetic
Traits/Sensitivities
• Population illnesses
(e.g., asthmatics,
diabetics)
• Genetic predisposition
to contracting a
disease (e.g. breast
cancer)
• Intrinsic traits (e.g.,
race, gender)
Cultural. Dietary and Behavioral Factors
• Local fish as staple of diet
• Smoking, drug/alcohol abuse
• Outdoor activities highly valued
• Drinking water from privately owned wells
Figure 9. CRA framework illustrating various potential roles of chemical and
non-chemical Stressors and buffers. Current areas of emphasis in HHRA are
interaction of ecological and human Stressors, and active collaboration with the
HSRP and SHC programs to consider resiliency and well-being indices.
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Topic 4: Advancing Analyses and
Applications
The HHRA program is multidisciplinary and
aimed at incorporating scientific innovations to
advance analytic approaches and applications.
Projects under this topic are targeted at
enhancing hazard characterization, expanding
the repertoire of dose-response methods
and models, and characterizing the utility
of emerging data and new computational
tools as applied to risk assessment. Another
project enhances and maintains databases
and software support to ensure transparency,
and facilitates understanding and translation
to Agency partners and external stakeholders.
These projects are critical to keeping assessment
activities contemporary with emerging concepts
in exposure sciences, advances in biotechnology,
and the evolution of computational approaches
and systems biology for understanding disease
processes and ecosystem impacts. Refinements
to current approaches are expected to improve
the accuracy, efficiency, flexibility, and utility
of applications across the large landscape of
assessment activities served by the HHRA
program and position it to be more agile and to
better support characterization of wellness and
sustainability.
Project 7: Advancing Hazard Characterization
and Dose-Response Methods
Tasks in this project advance new approaches
and refine procedures to address specific chal-
lenges that arise across HHRA assessment ac-
tivities. Systematic review methods were rec-
ommended by the NRC (NRC, 2011) and aid
transparency of assessment activities and in-
form evidence integration for determination
of hazard. Steps include identifying relevant
studies and evaluating their quality, identify-
ing relevant endpoints for human health risk
evaluation, evaluating mechanistic information,
synthesizing study results within an evidence
stream for a health effect (e.g., human, ani-
mal, mechanistic), and integrating qualitative
and quantitative information across evidence
streams. A task on advancing systematic review
will continue to evaluate case studies, incor-
porate feedback from workshops conducted
with stakeholders, and compare available ap-
proaches in order to develop tailored tools to
HHRA assessment products. This work will re-
sult in consistent and transparent approaches
for systematic review across HHRA assessment
products.
PROJECT 7 HIGHLIGHTS
Advancing Hazard Characterization and
Dose-Response Methods
Advancing systematic review methods
Case studies to apply AOP and MO A to inform
hazard characterization and dose-response
Expansion of dose-response models
Approaches to benefit-cost and uncertainty
analyses
Characterizing determinants of risk to support
assessment of acute, short-term and episodic
exposures
Workshops on critical challenges
Assessment activities have also identified
more powerful statistical methods for dose-
response and trend analysis that may improve
quantification. More robust methods such as
Bayesian approaches and model averaging
for uncertainty analyses may also improve
quantitative approaches and ensure better
coverage of response. These methods will be
evaluated with case studies and code developed
to support subsequent implementation.
The HHRA program anticipates that in order to
advance and achieve the vision proposed by
the NRC for exposure science and toxicology
testing, these concepts must be applied in
risk assessment approaches. As understanding
-------
of systems biology advances, mechanistic
insights should help to incorporate other
measures such as biomarkers and effects at
different levels of biological organization into
risk assessment for a fuller characterization of
the spectrum of a disease outcome and the
key events of pathogenesis. For example, how
do new data mining tools for in vitro measures
at the genomic level inform dose-response?
As our understanding of the key events for
different endpoints or diseases evolves,
building bridges to systems biology requires
construction of methods that can incorporate
data on biomarkers from various disease
dimensions (e.g., early or late-stage) in various
tissues (e.g., blood or liver) of different species,
and the ability to incorporate high-throughput
data and adverse outcome pathways (AOP)
with different degrees of verification. The
prognostic significance of various key events
relative to more traditional endpoints and
disease outcomes needs to be established
to employ AOP and MOA in risk assessment.
Figure 10 provides a conceptual construct of
Exposure
Biologically
Effective
Dose
Early
Biological
Effect
Altered
Structure /
Function
Exposure
Exposure Factors
Effect
Prognostic
Significance
Exposure
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Dosimetry _' DF1 • '
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Initiating Event i^^
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Altered Signaling •
Altered
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(Disrupted
homeostasis
Altered tissue
development/function
^r ^
H Ad verse
Outcome
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/
Human
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Susceptibility
Figure 10. Conceptual construct showing the relationships of computational models and schematics
developed for biomarkers, AOP and MOA applied to risk assessment. The scheme of key events along
the exposure-dose-response continuum is based on that of Schulte (1989) as proposed for biomarkers and
modified by Jarabek et al. (2009) for mode of action (MOA). The blue box and blue-bordered key events
outline elements of an adverse outcome pathway (AOP) described by Villeneuve et al. (2014). Key events
of pathogenesis are depicted as solid border nodes, key event relationships are depicted as solid directed
arrows between key events, and determining factors (DF) that control or may modify those relationships (e.g.,
ventilation rate; absorption, distribution, metabolism or elimination; repair, etc.) are depicted as dashed ovals
and arrows. The areas covered by components of a biologically based dose-response (BBDR) model structure to
support quantitative dose-response analysis are shown as the following: exposure models (green); dosimetry or
physiologically based pharmacokinetic (PBPK) models of toxicokinetics (TK) to describe tissue delivery (orange);
and tissue response or toxicodynamics (TD) models (pink). Markers or considerations of susceptibility inform all
components of the continuum. For example, lifestage or disease state factors may influence parameter values
for exposure, dose, and response.
-------
the relationships among biomarkers, AOP,
and MOA, the types of computational models
that can inform and improve the accuracy
of descriptions for those relationships, and
where considerations of susceptibility (e.g.,
due to lifestage or disease) may modify those
relationships. Several applications of this
knowledge are applied in tasks under Project 7.
Afuller characterization of disease pathogenesis
also necessitates consideration of the
nature of toxicity and how this relates to the
various exposure scenarios that may require
assessment. Real-world exposures include
single acute duration increases in exposure
and fluctuations in exposure levels (including
repeated episodic increases). To best address
these variables, accumulation of effects or
the chemical must be characterized, and
consideration given to susceptible life stages
or windows of vulnerability. Determinants such
as the concentration, duration, and timing of
exposures for different classes of chemicals
based on physicochemical characteristics (e.g.,
aldehydes versus volatile organic chemicals)
and specific endpoints of interest across HHRA
risk assessment products will be evaluated by
targeted case studies aimed at developing new
assessment products to characterize risks from
various exposures.
Benefit-cost analysis is widely employed in
evaluating environmental policies, enjoys wide-
spread acceptance, and is required by Executive
Order and certain statutes. Case studies will be
used to explore extension of methods to quali-
tatively and quantitatively address benefit-cost
and uncertainty analyses through review of lit-
erature, evaluation of available methods, and
use and possible development of software.
These will be targeted at critical disease out-
come and effect measures of interest to partner
program offices.
Other specific issues arise in various assess-
ment activities or as emerging science and
understanding evolve. For example, the IRIS
assessment for inhaled methanol required de-
velopment of methods to address endogenous
background levels. The HHRA program devotes
special workshops to discuss and evaluate spe-
cific issues as they arise in assessments with
the broader scientific community and stake-
holders. These workshops not only inform the
specific assessments, but also enhance under-
standing and appreciation of current scientific
challenges and thereby stimulate new research
and methods to accelerate their application in
assessments. As examples, past and near-term
planned workshops to be convened by the
HHRA program are devoted to the following is-
sues:
• Mode of action for development of mouse
lung tumors (2014)
• Workshop on systematic review methods
(2014)
• Epigenetics workshop (September 2015)
• Advancing systematic review
(December 2015)
• Temporal issues for environmental
pollutants: Health effects and methodologies
for estimating risk (January 2016)
• Characterizing and communicating
uncertainty in human health risk assessment
(2016)
Project 8: Applying Emerging Science to
Inform Risk Screening and Assessment
This project is devoted to characterizing the
utility of new data streams and computational
tools, such as those developed by the CSS
program and increasingly available from other
sources such as the NIH, university consortiums,
and the clinical arena. The HHRA program
plans to approach this characterization of high-
throughput screening and other data mining
-------
outputs as applied to informing and improving
HHRA risk assessment products in a step-wise
fashion. Emergingdatastreamswill beevaluated
in the exposure-dose-response context of risk
assessment in order to understand what key
biological, spatial, or temporal features the new
measures or computational tool may represent
(Figure 10). This understanding is the basis for
building confidence in and building capacity for
employing emerging technologies across the
assessment landscape spanning from research
prioritization to risk screening, and ultimately
quantitative dose-response analysis (Figure 5).
The HHRA program will approach the imple-
mentation of these new data and tools both
from the perspective represented by under-
standing the significance of molecular initiating
events (MIE) for chemicals with different physi-
cochemical properties and associated with po-
tential AOP for predicting specific endpoints;
as well as from the perspective of developing
approaches for integrating these data and end-
points to describe different diseases. These are
viewed as complementary approaches that
evaluate evidence along the same continuum
of potential disease pathogenesis.
The utility to characterize risk of various data
from alternative, high-throughput screening
(HTS) platforms or approaches such as structural
read-across/quantitative structure-activity
relationship (QSAR), in vitro biological activity
assays (e.g., ToxCast), and toxicogenomics
will be evaluated for different classes of
chemicals and various endpoints commonly
encountered in risk assessment. These case
study characterizations should support the
development of new assessment products and
refined approaches to derivation of PPRTV and
IRIS assessments.
Development of a disease-based data integra-
tion approach will begin with case studies of
specific disease outcomes of interest to HHRA
assessment priorities, such as that underway
for inorganic arsenic. The approach will build
on lessons learned in the report Next Genera-
tion Risk Assessment: Incorporation of Recent
Advances in Molecular, Computational, and
Systems Biology (U.S. EPA, 2014). This report
was a collaborative effort by the CSS and HHRA
programs and points to future directions for
stronger collaboration and innovative applica-
tions of new data streams and computational
approaches in risk assessment. Collaboration
with the CSS program for developing screen-
ing and read-across applications is ensured by
having HHRA scientists participate on the Dem-
onstration and Evaluation project within CSS;
these same scientists are involved in tasks that
then apply the tools developed directly into in-
forming PPRTV assessments or for developing
new assessment products.
PROJECT 8 HIGHLIGHTS
Applying Emerging Science to Inform
Risk Screening and Assessment
Characterizing utility of new data streams and
computational tools applied to risk assessment
products
Case study exploration of disease-based data
integration approaches
Updated dosimetry models and guidance to
support the application of AOP key events and
MOA in dose-response analyses
Expanded exposure assessment tools and
guidance
Analytical considerations and interpretation
guidance for selected emerging sensor data
Another task is devoted to revising dosimetry
adjustments to address multiscale integration
of data in order to advance the application
of AOP/MOA or biomarker data. Current
models and guidance on choice of dosimetry
models will be updated to describe potential
dose metrics for key events at different levels
-------
of organization for portal-of-entry effects in
the respiratory tract and other critical target
tissues. These updates are necessary to inform
both evidence integration approaches and to
facilitate quantitative dose-response analyses
in keeping with the NRC vision represented by
Exposure21 and Tox21 recommendations (NRC
2007; 2011). This task and others on exposure
will also evaluate how best to integrate with
exposure modeling platforms.
Exposure assessment is also a key component
integral to characterizing hazard and risk and
an area of rapidly emerging scientific advances.
There is broad recognition thatthe risk estimates
used to protect human health and ecosystems
would be improved with better exposure data
(NRC, 2012). With the recent development of
large environmental and chemical databases
and personal and environmental sensors, there
is great opportunity to improve methods to
more accurately characterize exposure (e.g.,
intensity, frequency, duration, and route).
However, to utilize the diverse array of newly
available data for exposure assessments,
methods are required to translate and adapt
data into well-established exposure protocols.
A task in Project 8 on the evaluation and
application of new exposure data and methods
is targeted to do so.
EPA's EXPOsure toolBOX (EPA-Expo-Box) is a
toolbox created by HHRA scientists to assist
individuals from within government, industry,
academia, and the general public with assessing
exposure. It is a compendium of exposure
assessment tools that links to guidance
documents, databases, models, reference
materials, and other related resources. Exposure
assessment resources are organized into six Tool
Sets, each containing a series of modules that
can be accessed from the link below. In addition,
links to resources on other over-arching topics
can be accessed from the Quick Finder menu at
the top of the homepage. EPA -Expo-Box also
contains an Exposure Factors module which has
been designed to improve the accessibility and
usability of data from EPA's Exposure Factors
Handbook: 2011 Edition (U.S. EPA, 2011). EPA-
Expo-Box is available at http://epa.gov/risk/
expobox/. Work in this task will update EPA-
Expo-Box and exposure factors data as new
and improved tools and data become available.
HHRA scientists will also develop new tools
for accessing and updating data on ingestion
factors and collaborate with the SHC research
program to consider potential approaches for
collecting soil and dust ingestion data.
Other new products under this task include
development of the Exposure Factors Interactive
Resource for Scenarios Tool (ExpoFIRST) and
EPA-Eco-Box. ExpoFIRST is a standalone tool
that draws from data in the EPA's Exposure
Factors Handbook for quick, easy, and flexible
development of human exposure scenarios.
EPA-Eco-Box is being developed as a Web-based
toolbox providing links to guidance documents,
databases, and other relevant information for
ecological risk assessors.
Another product in this task represents a
joint venture with the National Institute for
Occupational Safety and Health (NIOSH) Center
for Direct Reading and Sensor Technologies.
The analytical considerations underlying
specific sensors and their interpretation will be
a continued collaboration with other research
programs employing such technologies
including ACE, HSRP, and SSWR. Considerations
for analytical characterization and guidance on
interpretation of sensor data in risk assessment
will be developed.
Project 9: Risk Assessment Support and
Training
By providing high-quality targeted tools,
data, and training, EPA enables consistency in
assessmentapproaches by various stakeholders,
enhancing the quality of assessment products
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and confidence in risk-based decision making.
Stakeholder engagement regarding the output
of the HHRA program is enhanced by training
on risk assessment methods and outreach
regarding risk assessment activities and
applications. Feedback on the utility of various
assessments, including their scope and content,
cycles back to the problem formulation input
for the program in the future.
Tasks under this project involve updating and
maintenance of critical software infrastructure
with enhanced features including data access,
interoperability with other ORD models and
databases, and transparency of assessments,
such as the Health and Environmental Research
Online (HERO) database (http://hero.epa.gov/)
of studies used in assessments and benchmark
dose software (BMDS) for dose-response
modeling (http://www.epa.gov/ncea/bmds/).
New software modules to support advances in
evidence integration and extend dose-response
methods will be developed. Training modules
on new tools are also included to inform
the risk assessment community of methods
and advances in risk analysis, and to support
consistency in risk assessment development.
One example of training that HHRA scientists
have developed is a program entitled Risk
Assessment Training and Experience (RATE), a
comprehensive set of risk assessment training
modules in the four primary areas of hazard
identification, dose-response assessments,
exposure assessment, and risk characterization
for both human health and ecological risk
assessment. Additional areas of focus for
guidance and training are risk management,
risk communication, and new approaches in
human health risk assessment methodology.
Risk assessment training sessions using the
RATE materials have been used in multiple
national and international training efforts and
support many of the ORD research programs
by broadening the knowledge base of involved
staff. The HHRA program will continue to support
this training as an important resource for its
program partners and external stakeholders.
PROJECT 9 HIGHLIGHTS
Risk Assessment Support and
Training
Updating and maintenance
of HERO database and BMDS to
support assessment activities and
stakeholder engagement
Enhanced features for
interoperability and data access
New modules to support advances
in evidence integration and dose-
response analyses
Training to support understanding
and consistency of risk assessment
development
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Anticipated Research
Accomplishments
The HHRA program has developed nine
integrated project areas to provide a program
structure that emphasizes efficient assessment
development while advancing needed risk
assessment-related analyses and applications.
During the development of chemical
assessments, cross-cutting issues may arise, and
their resolution leads to advances in the state-
of-the-science, as well as advancing knowledge
and consistent use of methods and models by
the risk assessment community. Anticipated
accomplishments under these project areas
are briefly listed below and selected proposed
outputs are presented in table format in
Appendix A. These HHRA program activities
also inform the four ORD roadmaps (Climate
Change, Children's Environmental Health,
Environmental Justice, and Nitrogen/Co-
pollutants).
Topic 1: Integrated Risk Information
System (IRIS)
The IRIS program will continueto produce robust
and responsive assessments to characterize
risks addressing Agency priorities. The program
is implementing enhancements to the efficiency
of its process and stakeholder engagement,
providing more opportunity for participation in
problem formulation and tailoring the scope of
its assessments. A multi-year plan resulting from
significant program partner input will ensure
that the highest priorities for the Agency will be
addressed and timely, and a process to update
IRIS assessments will ensure that assessments
remain based on the most relevant and current
information for key chemicals. Incorporating
advances in assessment methods will include
application of systematic review methods
for hazard characterization and evidence
integration, and new methods for dose-
response analysis and insights from mechanistic
understanding will be applied when mature.
Public science meetings and ongoing website
upgrades will enhance communication of
the program's progress and status, while a
handbook of operating procedures will provide
both education, transparency, and consistency
regarding assessment development. The HHRA
program is committed to maintaining IRIS as
the premier source of health hazard and dose-
response information for priority environmental
pollutants.
Topic 2: Integrated Science
Assessments (ISAs)
The HHRA program will continueto work in close
collaboration with the primary client office, the
Office of Air and Radiation's (OAR) Office of Air
Quality Planning and Standards (OAQPS), as well
as the Clean Air Scientific Advisory Committee
(CASAC) and other stakeholders, to develop
ISAs as a major component of its research
portfolio to identify, interpret, and characterize
data on the health and environmental effects
of exposure to criteria air pollutants. The HHRA
program also provides sustained scientific and
technical support during the development
of exposure, risk, and policy assessments by
OAQPS, and during national rule development.
Advances in scientific understanding of the
MOA and key events of the disease pathways
for these pollutants will help integrate the
evidence for determining these risks as well as
inform approaches for other HHRA assessment
products such as the IRIS assessments. During
the FY2016-2019 period, other innovations
in analysis approaches are anticipated as the
HHRA program grapples with characterizing
the health and welfare effects of SO2 and NO2.
New insights on determinants of PM toxicity
will inform ISA development and use as the
scientific basis for decisions to retain or revise
the National Ambient Air Quality Standards.
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Topic 3: Community and Site-
specific Risk
The HHRA program will continue to support
the risk management decisions required by the
Office of Solid Waste and Emergency Response
(OSWER), and to address community needs.
Annual production of PPRTV assessments
targeted to the priorities of OSWER will
continue to provide the scientific support for
decisions on the management of municipal
and hazardous waste sites. Application of new
data streams and approaches will occur as
their utility is characterized and may extend
to additional assessment products for rapid
response to urgent contamination situations.
Significant technical support will continue to aid
regions in implementation and understanding
of these assessments. Efforts on extending
and targeting cumulative risk assessment
methods to integrate multiple stressors will
help communities understand and characterize
their "place-based" concerns. Specific case
studies and approaches will be explored to
develop exposure and risk apportionment to
different exposure media (air, water, land) and
to provide for the integration of ecological and
human effect measures. We also anticipate that
work on the role of susceptibility and epigenetic
markers will be developed into a framework for
incorporating these considerations into CRA
approaches, thereby ensuring relevancy and
that the latest innovations in biomonitoring are
addressed.
biology for understanding disease processes
and ecosystem impacts. Refinements to
current approaches are expected to improve
the accuracy, efficiency, flexibility, and utility
of applications across the large landscape of
assessment activities served by the HHRA
program and position it to be both more
agile and better support characterization
of wellness and sustainability. Sustaining
support of databases and software will ensure
transparency of assessments and facilitate
communication and consistency of assessment
development. Training will increase both
understanding of methods and stakeholder
capability for applying assessment advances.
Some specific areas to be advanced are:
refinements to systematic review, extensions
of dose-response analyses for model averaging
and data integration, and approaches to benefit-
cost analyses and uncertainty characterization.
Updates to dosimetry models will facilitate the
use of MOA and AOP insights and inform new
approaches to the characterization of acute,
short-term, and episodic exposures. Application
of emerging sensor data will include both
analytical considerations and interpretation,
while updates to exposure assessment tools
will continue to be developed to translate
and describe factors that influence exposure
characterization.
Topic 4: Advancing Analyses and
Applications
Projects in this area cut across the entire
HHRA program portfolio to ensure that its
assessment products will keep contemporary
with emerging concepts in hazard and dose-
response assessment, exposure sciences,
advances in biotechnology, and the evolution
of computational approaches and systems
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Conclusions
Human health risk assessment is the process
of analyzing information to estimate the
potential for an environmental pollutant
to harm exposed persons and ecosystems,
and the assessment documents that are the
product of this process are fundamental to
environmental management decision making.
Scientific evidence from diverse disciplines
must be systematically identified, consistently
evaluated for scientific merit and relevance,
and integrated to support development
of human health and environmental risk
assessments. By fully engaging the scientific
and policy communities in the HHRA program,
EPA is producing reliable, transparent, and
high-quality assessments while identifying the
scientific research needed to advance future
assessments and ensure effective translation
and communication of the Agency's assessment
methods, models, and data. The outcome of
this HHRA Strategic Research Action Plan will
be highly influential scientific assessments
used to support important and complex Agency
decisions to protect human health and the
environment, coupled with advances in risk
assessment methods that increase confidence
in the application of science to support such
decisions.
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References
Gallagher, S. S., Rice, G. E., Scarano, L J., Teuschler, L K., Bollweg, G., Martin, L (2015). Cumulative
risk assessment lessons learned: a review of case studies and issue papers. Chemosphere. Feb;120,
697-705.
Jarabek, A. M., Pottenger, L. Hv Andrews, L. S., Casciano, D., Embry, M. R., Kim, J. H., Preston, R.
J., Reddy, M. V., Schoeny, R., Shuker, D., Skare, J., Swenberg, J., Williams, G. M., Zeiger, E. (2009).
Creating context for the use of DNA adduct data in cancer risk assessment: I. Data organization.
Crit. Rev. Toxicol. 39(8), 659-78.
Lassiter, M. G., Owens, E. O., Patel, M. M., Kirrane, E., Madden, M., Richmond-Bryant, J., Mines, E.
P., Davis, J. A., Vinikoor-lmler, L, Dubois, J. J. (2015). Cross-species coherence in effects and mode
of action in support of causality determinations in the U.S. Environmental Protection Agency's
Integrated Science Assessment for lead. Toxicology. April;330, 19 - 40.
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Council, http://www.nap.edu/openbook.php7record id=11970
National Research Council. (2009). Science and Decisions: Advancing Risk Assessment. Committee
on Improving Risk Analysis Approaches Used by the U.S. EPA; Board on Environmental Studies and
Toxicology; Division on Earth and Life Studies. National Academies of Science, http://www.nap.
edu/openbook.php?record id=12209
National Research Council. (2011). Review of the Environmental Protection Agency's Draft IRIS
Assessment of Formaldehyde. Committee to review EPA's Draft IRIS Assessment of Formaldehyde;
Board on Environmental Studies and Toxicology; Division on Earth and Life Studies. National
Academies of Science, http://www.nap.edu/openbook.php7record id=13142
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Environmental Studies and Toxicology; Division on Earth and Life Studies. National Academies of
Science, http://www.nap.edu/openbook.php7record id=13507
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Interim Report (2013). Committee on Inorganic Arsenic. Board on Environmental Science and
Toxicology. National Academies of Science, http://www.nap.edu/catalog.php7record id=18594
National Research Council. (2014). Review of EPA's Integrated Risk Information System (IRIS)
Process. Committee to Review the IRIS Process; Board on Environmental Studies and Toxicology.
National Academies of Science, http://www.nap.edu/catalog.php7record id=18764 Schulte, P. A.
(1989). A conceptual framework for the validation and use of biomarkers. Environ. Res. 48, 129-
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I., Yang, L, Healy, E., Blank, M. B., Clewell III, H. J., Allen, B. C, Andersen, ME. (2013). Temporal
concordance between apical and transcriptional points of departure for chemical risk assessment.
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of Recent Advances in Molecular, Computational, and Systems Biology. Final report. September.
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(2014b). Adverse Outcome Pathway Development II: Best Practices. Toxicol. Sci. 142(2), 321-30.
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Appendix A
Proposed Outputs, Human Health Risk Assessment Research Program FY16-19
The following table lists the expected outputs from the Human Health Risk Assessment research
program, organized by topic. Note that outputs may change as new scientific findings emerge.
Outputs are also contingent on budget appropriations.
Topic 1
Project 1
IRIS document components
IRIS scientific and technical
consultations
Stakeholder engagement and
outreach for IRIS program
IRIS Handbook of Operational
Procedures
Project 2
Decision Strategy
Reviews and updates
Integrated Risk Information System (IRIS)
IRIS Assessments
Annually released to the public for priority chemicals following
the multi-year agenda posted on the IRIS website:
• Scoping and problem formulation packages
• Literature searches and study tables
• Interagency review drafts
• External peer review drafts
• Final assessments
HHRA scientists provide scientific support to assessments by
identifying issues and advancing solutions;
Technical support to program offices regarding
implementation of IRIS assessments in regulatory applications
(e.g., OAQPS residual technology review, OW contaminant
candidate list, OSWER records of decision)
Bi-monthly scientific meetings on assessment activities;
Regular meetings with program partners regarding priorities
Ongoing guidance on assessment approaches and process
IRIS Updates
FY16 Develop approach for identifying assessments that
should be updated with high priority
FY16 Develop efficient processes for developing and reviewing
updated assessments in a short time
FY16-19 Implement IRIS update decision strategy and regularly
review IRIS values.
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Topic 2
Integrated Science Assesssments (ISA)
Project 3
Integrated Science Assessments
ISA science issue workshops
Convene scientific experts to review and identify scientific or
policy issues prior to initiation of ISA development
ISA document drafts
Release external peer review drafts for Clean Air Scientific
Advisory Committee and public reviews
• FY16 1st draft NO2 & SO2 secondary (welfare) ISA
• FY16 2nd draft NO2 & SO2 secondary (welfare) ISA
• FY16 1st draft of ISA for PM
• FY17 2nd draft of ISA for PM
Release final ISA documents in support of National Ambient
Air Quality Standards (NAAQS)
• FY16 Final rulemaking on lead
• FY16 SO2 primary (health)
• FY17 NO2 & SO2 secondary (welfare)
• FY18 Final rulemaking on SO2 primary (health) and
NO2 primary (health)
• FY19 Final rulemaking on NO & SO secondary (welfare)
ISA-related scientific and
regulatory support
Support to Office of Air and Radiation regarding
implementation of ISA to policy assessment and rule making
for decisions regarding review, retention or revision of the
NAAQS
• FY16 Integrated review plan for PM ISA
• FY16-18 NO2 primary (health) ISA
• FY16-18 SO2 primary (health) ISA
ISA-related scientific
advancements
Multipollutant science document health issues;
Multipollutant science document on the effects of the criteria
pollutants on climate forcing;
Publications and scientific analyses to support the ISAs
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Topic 3
Project 4
PPRTV assessments
Project 5
Superfund Technical Support
Center and Ecological Risk
Assessment Support Center
Report on technical support
Emergent issues and other
Agency priorities
Project 6
Approaches to cross-species
data integration to support
cumulative risk assessment
(CRA)
Incorporating multiple stressors
Incorporating susceptibility
information into CRA
Apportioning multimedia
exposure and risk across human
and ecological receptors
Community and Site-specific Risk
Provision peer-reviewed toxicity values (PPRTV) assessments
>12 developed annually in support of OSWER site
management decisions
Site-specific and Superfund Regulatory Support
FY16-19 Provide on-going support to EPA regional offices for
Superfund risk assessment activities and scientific support for
ecological risk assessment
FY16-19 Provide quarterly reports on technical support
FY16-19 Annually provide rapid assessment response (e.g.,
West Virginia MCHM spill) or other scientific support on
Agency priorities as requested by programs, regions, EPA
Science Advisory or Administrator
Cumulative Risk Assessment Methods and Applications
FY17 Publication of case study(s) to advance incorporation of
ecological risk assessment into CRA framework
FY18 Develop multi-criteria decision analysis approaches
to integrate ecological and human health indices and aid
transparency of valuations
FY16 Publication of journal manuscript describing use of
directed acyclic graphs for drawing causal inference in CRA
FY17-19 Case studies and methods development to
characterize risks posed by multiple chemical and non-
chemical stressors to human health.
FY16 Report from science workshop on epigenetics and CRA
FY19 Publication of a framework for interpreting epigenetic
information in risk assessment
FY17 Modeling of dermal and inhalation exposures to diethyl-
and di(l-n-butyl) phthalate to inform evaluation of mixtures
FY18 Apportioning multimedia exposure and risk across
human and ecological receptors
FY16-19 Support Risk Assessment Forum activities on
cumulative phthalate exposures
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Topic 4
Project 7
Advancing methods for
systematic review and evidence
integration
Advancing quantitative
methods
Advancing methods for benefits
and uncertainty analyses
Characterizing determinants of
risk: Concentration, duration
and timing of exposure
Scientific workshops on major
risk assessment methodology
issues
Project 8
Disease-based integration of
new data types
Characterization and
quantitative application of high-
throughput screening (HTS) and
other data-mining derivations
Advancing Analyses and Applications
Advancing Hazard Characterization and Dose-Response
Methods
FY16 Scientific workshop report on advancing systematic
review
FY17 New methods to improve evidence identification,
evaluation and evidence integration
FY17 Refine study quality evaluation approaches
FY18 Develop multivariate dose-response analysis methods
FY19 Report on best practices for non-parametric, semi-
parametric, and parametric dose-response modeling methods
FY19 Report on methods to advance meta-analyses and
Bayesian approaches
FY18-19 Case studies to evaluate approaches to probabilistic
derivation of reference values to support benefits analysis
FY17 Publish workshop report on Temporal Issues for
Environmental Pollutants: Health Effects and Methodologies
for Estimating Risk
FY19 Report on evaluation and quantification of early-life
exposures for non-cancer and cancer outcomes
FY19 Concentration-duration-response surface evaluation and
interpretation to support derivation of assessments of acute,
short-term, episodic and lifetime exposures
FY16-19 Convene scientific workshops held with subject
matter experts to address current challenges and advance
approaches to risk assessment
Applying Emerging Science to Inform Risk Screening and
Assessment
FY19 Case study(s) of disease-specific assessment of multiple
environmental risk factors to illustrate integrated use of
multiple, new advanced biological data types
FY18 Case studies to characterize the utility of HTS and other
data for various classes of chemicals and various endpoints
commonly encountered in risk assessment
FY18 Adverse outcome pathway (AOP) footprinting: hazard
grouping and quantitative analysis for mixtures assessment of
toxicologically uncharacterized stressors
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Dosimetry21: Advancing
multiscale dosimetry models
to incorporate AOP/Mode of
Action (MOA) and biomarker
data
FY16-17 Convene Federal community of practice to develop
an issue paper for NRC review and report regarding need for
multiscale measurement and models to address application of
AOP/MOA or biomarker data and realize vision of Tox21 and
Exposure21 reports
FY19 Development of a suite of model structures including
portal-of-entry for each route and implementation via
development of methods and case studies to implement
anticipated NRC recommendations
Evaluation and application
of new exposure data and
methods
FY17 Advancements and updating of Exposure Factors
Handbook (Draft food intake)
FY17 Release of ExpoFIRST - quick, easy, and flexible
development of human exposure scenarios (I? and final)
FY18 Release of EPA-Eco-Box - quick, easy, and flexible
development of ecologic risk assessment scenarios (draft and
final)
FY16-18 Collaboration with NIOSH Center for Direct
Reading and Sensor Technologies and the cross-agency
Air Sensors Health Group to develop criteria for analytical
characterization, integration of sensor data with dosimetry
modeling, interpretation of sensor data on application to risk
assessment, and recommendations regarding best practices
for management and curation of sensor data.
Project 9
Risk Assessment Support and Training
Development and maintenance
of essential software and
support tools
FY16-19 Update and maintain software supporting critical
infrastructure activities including data access (IRIS website)
and assessments (Health and Environmental Research Online);
benchmark dose software, PBPK/dosimetry software, etc.
FY16-19 Development of new software modules to implement
advances in evidence integration and dose-response methods
and applications of new data streams and mechanistic data
mining
Development and application
of risk assessment training
FY16-19 Provide ongoing outreach to states, regions, program
offices and international entities interested in training on risk
assessment approaches and techniques
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Appendix B. Executive Orders and EPA Policies
HHRA Supports
Executive Order 13045: Protection of Children from Environmental Health Risks and Safety
Risks, which states that each federal agency "(a) shall make it a high priority to identify and assess
environmental health risks and safety risks that may disproportionately affect children; and (b)
shall ensure that its policies, programs, activities, and standards address disproportionate risks to
children that result from environmental health risks or safety risks."
EPA's 1995 Policy on Evaluating Risk to Children, which states that "It is the policy of the U.S.
Environmental Protection Agency (EPA) to consider the risks to infants and children consistently
and explicitly as a part of risk assessments generated during its decision making process, including
the setting of standards to protect public health and the environment."
Executive Order 12898: Federal Actions To Address Environmental Justice in Minority
Populations and Low-Income Populations, which states that "(a) Environmental human health
research, whenever practicable and appropriate, shall include diverse segments of the population
in epidemiological and clinical studies, including segments at high risk from environmental
hazards, such as minority populations, low-income populations and workers who may be exposed
to, substantial environmental hazards" and "(b) Environmental human health analyses, whenever
practicable and appropriate, shall identify multiple and cumulative exposures."
EPA's 2011 Environmental Justice Action Plan ("Plan EJ 2014"), which established measurable
commitments that address the Agency's national environmental justice priorities. These priorities
created an Agency-wide focus on matters that environmental justice advocates and others have
identified as critical environmental justice issues. In 2015, EPA is developing the EJ 2020 Action
Agenda, the Agency's next overarching strategic plan for environmental justice.
Executive Orders 12866,13563 and OMB Circular A-4, which guide the analysis of the costs
and benefits of Federal regulatory decisions, including the assessment of the public health and
environmental benefits associated with regulatory options. HHRA health assessments play a
crucial role in the assessment of the benefits of actions taken by EPA; potential improvements in
how noncancer dose-response is quantified, as discussed elsewhere in this document, have been
identified as important to advancing EPA benefits analysis for regulatory support.
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Appendix C. Research Program Partners and
Stakeholders
Note: HHRA works with many partner and
stakeholder organizations, and new partnerships
are continually forming; therefore, this list is not
comprehensive.
EPA Board of Scientific Counselors (BOSC)
EPA Clean Air Scientific Advisory Committee
(CASAC)
EPA Science Advisory Board (SAB)
Chemical Assessment Advisory Committee
(CAAC)
EPA Regions 1 - 10
Office of Air and Radiation (OAR)
Office of Air Quality Planning and
Standards (OAQPS)
Office of Transportation and Air Quality
(OTAQ)
Office of Chemical Safety and Pollution Prevention
(OCSPP)
Office of Pesticide Programs (OPP)
Office Pollution Prevention and Toxics
(OPPT)
Office of Science Coordination and Policy
(OSCP)
Office of Children's Health Protection (OCHP)
Office of Environmental Justice (OEJ)
Office of Policy (OP)
National Center for Environmental
Economics (NCEE)
Office of the Science Advisor (OSA)
Office of Solid Waste and Emergency Response
(OSWER)
Office of Emergency Management (OEM)
Office of Underground Storage Tanks
(OUST)
Office of Superfund Remediation and
Technology Innovation (OSRTI)
Office of Resource Conservation and
Recovery (ORCR)
Office of Program Management (0PM)
Office of Water (OW)
Office of Ground Water and Drinking Water
(OGWDW)
Office of Science and Technology (OST)
Other Governmental Stakeholders
Agency for Toxic Substances and Disease Registry
(ATSDR)
California's Environmental Protection Agency
(Ca I/EPA)
Office of Environmental Health Hazard
Assessment (OEHHA)
Centers for Disease Control and Prevention (CDCP)
Department of Defense (DoD)
Air Force Research Laboratory (AFRL)
Army Corps of Engineers (ACE)
Army Public Health Command
Defense Advanced Research Projects Agency
(DARPA)
Naval Medical Research Unit (NAMRU)
Department of Labor
Occupational Safety and Health
Administration (OSHA)
Food and Drug Administration (FDA)
National Center for Toxicological Research
(NCTR)
National Academy of Sciences (NAS)
Government Accountability Office (GAO)
National Institutes of Health (NIH)
National Cancer Institute (NCI)
National Institute of Environmental Health
Sciences (NIEHS)
Chemical Genomics Center (CGC)
National Toxicology Program (NTP)
Texas Commission on Environmental Quality
(TCEQ)
Nongovernmental Organizations
Alliance for Risk Assessment (ARA)
American Public Health Association (APHA)
American Chemistry Council (ACC)
Long-Range Research Initiative (LRRI)
Environmental Working Group (EWG)
Environmental Defense Fund (EOF)
Environmental Council of the States (ECOS)
Interstate Technology and Regulatory Council
(ITRC)
Integrated Life Sciences Institute (ILSI)
Health and Environmental Science Institute
(HESI)
National Resource Defense Council (NRDC)
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Appendix D.
Enhancements to IRIS
Program
The IRIS program develops human health
assessments that provide health effects
information on environmental chemicals to
which the public may be exposed, providing
a critical part of the scientific foundation for
EPA's decisions to protect public health. In their
report Review of the Environmental Protection
Agency's Draft IRIS Assessmentof Formaldehyde,
the National Research Council (NRC) made
several recommendations to EPA for improving
IRIS assessments and the IRIS program (NRC,
2011). The NRC's recommendations were
focused on the first step of the IRIS process, the
development of draft assessments. Consistent
with the advice of the NRC, the IRIS program
is implementing these recommendations using
a phased approach and is making the most
extensive changes to assessments that are in
the earlier stages of the IRIS process.
EPA agreed with the NRC's 2011 recom-
mendations for the development of IRIS assess-
ments and is fully implementing them consis-
tent with the report's "Roadmap for Revision,"
which viewed the full implementation of their
recommendations by the IRIS program as a
multi-year process. In response to the NRC's
2011 recommendations, the IRIS program has
made changes to streamline the assessment
development process, improve transparency,
and create efficiencies in the program. The NRC
has acknowledged EPA's successes in this area.
Their May 2014 report Review of the Integrated
Risk Information System (IRIS) Process, finds
that EPA has made substantial improvements
to the IRIS program in a short amount of time
(NRC, 2014). They also provide several recom-
mendations which they say should be seen as
building on the progress that EPA has already
made.
This appendix provides a brief summary of the
status of enhancements to the IRIS program.
Strengthening and streamlining the IRIS pro-
gram is an ongoing priority for the HHRA pro-
gram. As the IRIS program continues to evolve,
the HHRA program is committed to evaluating
how well its approaches promote constructive
public discussion with its stakeholders, as well
as reviewing how these approaches can more
effectively facilitate subsequent assessment de-
velopment. Enhanced stakeholder engagement
will help to ensure transparency and the use of
the best available science in IRIS assessments.
More information on the IRIS program's recent
enhancements can be found at http://www.
epa.gov/IRIS/process.htm and http://www.epa.
gov/IRIS/pdfs/irisprocessfactsheet2013.pdf.
Enhancements to the Development
Process
The IRIS program is implementing thefollowing,
which will help meet the goal of producing
high-quality assessments that are tailored to
program needs in a timely and transparent
manner:
• Internal planning and scoping meeting to
identify EPA needs, followed by a public
meeting to identify the available scientific
information for the chemical under
assessment.
• Publicly release the literature search and
search strategy, evidence tables, exposure-
response figures and information on key
scientific issues for the chemical. Convene a
public meeting to discuss these materials.
• Publicly release a draft assessment and
peer review charge for comment at a public
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meeting (these may be revised as needed
after the public meeting).
Improving the Science of IRIS
Assessments
Thefollowing changes were either implemented
or are in progress to improve the quality and
clarity of IRIS assessments:
• Implemented a new document structure that
is clear, concise and systematic.
• Incorporated a preamble that describes the
application of existing EPA guidance and the
methods and criteria used in developing the
assessments.
• Strengthened its practices for peer review
and protection against conflict of interest.
• Dedicated a specific Chemical Assessment
Advisory Committee (CAAC) of the
Scientific Advisory Board (SAB) to review
IRIS assessments. More information
on the SAB CAAC can be found at:
http://yosemite.epa.gov/sab/sabpeople.
nsf/WebCommitteesSubcommittees/
Chemical%20Assessment%20Advisorv%20
Committee.
• Created Discipline-Specific Workgroups and
Interdisciplinary Science Teams to evaluate
endpoint-specific and disciplinary issues
relevant to an assessment. These groups
coordinate across assessments to ensure
consistency, solve cross-cutting issues,
and advance scientific understandings
that contribute to decision making in IRIS
assessments.
• Adopted systematic review methods and
information management tools to improve
study selection and analyses including
improvements to the following:
° Evidence Identification: Literature
Collection and Collation Phase
A separate section provides a detailed
description of the literature search
and associated search and screening
strategy to identify and select
pertinent studies.
° Evidence Evaluation for Hazard
Identification - The IRIS program
is in the process of improving and
standardizing the approach to
evaluating evidence and standardizing
the documentation of this evaluation.
° Developed standardized presentation
of evidence tables and exposure-
response arrays to succinctly
summarize study design and findings.
° Improved process for selecting
studies for dose-response evaluation.
° Currently evaluating considerations
for combining data for dose-response
modeling and analysis.
Enhancements to Improve
Productivity and Transparency in
the IRIS Program
• Improved workforce planning to help increase
assessment output and improve scientific
evaluation.
• Conducting a survey of EPA program and
regional offices to identify and evaluate client
demands and the resources required to meet
user needs.
• Focused staff attention on a smaller number
of assessments to ultimately increase the
efficiency and output of the program.
• Established a set of "stopping rules" for new
data and scientific issues to help ensure
that IRIS assessments are not delayed by
new research findings or ongoing debate of
scientific issues after certain process points
have passed. Additional information about
the stopping rules is available at http://www.
epa.gov/iris/pdfs/IRIS stoppingrules.pdf.
• Improved stakeholder engagement in the IRIS
process throughout assessment development
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through the conduct of IRIS Public Science
meetings. These meetings benefit from
the participation of independent experts
identified by the NRC who provide input on
the scientific and technical aspects of IRIS
chemical assessments.
Holding peer consultation science workshops
which may focus on the state of the science
for a particular chemical or provide a forum
for discussion with experts about certain
cross-cutting scientific issues that may impact
the development of a scientifically complex
assessment.
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United States
Environmental Protection
Agency
PRESORTED STANDARD
POSTAGES FEES PAID
EPA
PERMIT NO. G-35
Office of Research and Development (8101R)
Washington, DC 20460
Official Business
Penalty for Private Use
$300
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