AGENDA

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA) 

FIFRA SCIENTIFIC ADVISORY PANEL (SAP) 

OPEN MEETING 

JULY 29-JULY 31, 2014

FIFRA SAP WEB SITE http://www.epa.gov/scipoly/sap/ 

DOCKET NUMBER: EPA–HQ–OPP–2014–0331

U.S. ENVIRONMENTAL PROTECTION AGENCY

CONFERENCE CENTER LOBBY LEVEL

ONE POTOMAC YARD (SOUTH BLDG.)

2777 S. CRYSTAL DRIVE, ARLINGTON, VA 22202

Scientific Issues Associated with New High Throughput Methods

To Estimate Chemical Exposure

Please note that all times are approximate (see note at the end of the Agenda).

Day 1 

Tuesday, July 29, 2014

9:00 A.M. Opening of Meeting and Administrative Procedures -- Fred Jenkins, Ph.D.,

Designated Federal Official, Office of Science Coordination and Policy, EPA 

9:05 A.M. Introduction and Identification of Panel Members -- James McManaman, Ph.D., 

FIFRA Scientific Advisory Panel Session Chair 

9:10 A.M. Welcome and Opening Remarks – David Dix, Ph.D., Director, Office of Science 

Coordination and Policy (OSCP), EPA

9:20 A.M. Introduction and Overview: New High Throughput Methods to Estimate 

Chemical Exposure -- Alan Dixon, Exposure Assessment Coordination and Policy Division 

(EACPD, OSCP), EPA

Exposure Prioritization with ExpoCast Research 

10:00 A.M. A Framework for High Throughput Exposure (HTE) Estimation -- John 

Wambaugh, Office of Research and Development (ORD), and National Center for 

Computational Toxicology (NCCT), EPA

10:30 A.M. Break

10:45 A.M. High Throughput Forward Prediction of Human Exposure -- Peter P. Egeghy, 

Ph.D. M.P.H., National Exposure Research Laboratory (NERL), ORD, EPA
11:05 A.M. Inference (Reverse Prediction) of Human Exposure -- Woodrow Setzer, National 

Center for Computational Toxicology (NCCT), ORD, EPA

11:35 A.M. Systematic Empirical Evaluation of Models (SEEM) Analysis and High 

Throughput Exposure Estimates -- John Wambaugh, ORD, NCCT, EPA

12:00 P.M. Lunch 

High Throughput Toxicokinetics (HTTK) and Reverse Toxicokinetics (RTK)

1:00 P.M. High Throughput Toxicokinetics (HTTK) and Reverse Toxicokinetics (RTK) for 

the Endocrine Disruptor Screening Program (EDSP) -- John Wambaugh ORD, NCCT, EPA

Ongoing Research Needs: Ecological Exposure Predictions

2:10 P.M. High Throughput Ecological Exposure Modeling -- Craig Barber, Ph.D. NERL, 

ORD, EPA

2:35 P.M. Break

2:50 P.M. Evaluation Data and Statistical Framework for Ecological Exposure Predictions 

-- Woodrow Setzer, NCCT, ORD, EPA

Ongoing Research Needs: Near Field Human Exposure Modeling

3:10 P.M. Toward a Third Generation SEEM Analysis: New Data and Models --

Kristin Isaacs, Ph.D. NERL, ORD, EPA

Future Applications

3:50 P.M. EDSP Integrated Activity and Exposure Based Prioritization and Screening –

Steven Knott, Director, EACPD, OSCP, EPA

4:35 P.M. Adjourn
Day 2 

Wednesday, July 30, 2014

9:00 A.M. Opening of Meeting and Administrative Procedures – Fred Jenkins, Ph.D.,

Designated Federal Official, Office of Science Coordination and Policy, EPA 

9:05 A.M. Introduction and Identification of Panel Members – James McManaman, Ph.D., 

FIFRA Scientific Advisory Panel Session Chair 

9:10 A.M. Follow-up from the Previous Day Presentations

10:00 A.M. Public Comments

10:45 A.M. Break

11:00 A.M. Public Comments (Cont’d)

12:00 P.M. Lunch

1:00 P.M. Charge to Panel

Charge Question 1.1. In the absence of sufficient exposure information to estimate exposure for 

the majority of the chemicals of interest in the Endocrine Disruption Screening Program (EDSP)

using EPA's historical low-throughput methods, please comment on whether the Systematic 

Empirical Evaluation of Models approach (SEEM) is scientifically sound and suitable for using 

High Throughput Exposure (HTE) methods to estimate relative levels of chemical exposures and 

the associated uncertainty of these estimates for consideration in a prioritization approach.

2:00 P.M. Charge to Panel

Charge Question 1.2 Please suggest the most important steps for EPA that could decrease 

uncertainties and increase confidence in using the HTE approach to predict exposures in various 

demographic groups (e.g., young children, women of child bearing age) for large numbers of 

chemicals.

2:45 P.M. Break

3:00 P.M. Charge to Panel

Charge Question 2.1. In the absence of sufficient empirical toxicokinetics information for the 

thousands of EDSP relevant chemicals, please comment on the approach of using High 

Throughput TK (HTTK), High Throughput PBTK (HTPBTK), In Vitro-In Vivo Extrapolation 

(IVIVE), and Reverse Toxicokinetics (RTK) for estimating chemical TK to provide an 
administered dose context to the concentrations showing bioactivity in the endocrine-related 

High-throughput screening (HTS) assays.

4:00 P.M. Charge to Panel

Charge Question 2.2. A comparison of the HTTK-predicted steady-state blood concentrations 

with in vivo values from the literature suggests that the overall correlation is low, but that the 

discrepancy between the two can be predicted using a combination of chemical properties, 

quantitative structure activity relationships (QSAR), and cutoffs from the HTTK assays. Please 

comment on: a) how well this approach characterizes the uncertainty in the steady-state blood 

concentrations, and b) whether the identification of chemical classes that need additional TK 

investigation is useful in a chemical prioritization or initial screening context.

5:00 P.M. Adjourn
Day 3 

Thursday, July 31, 2014

9:00 A.M. Opening of Meeting and Administrative Procedures – Fred Jenkins, Ph.D.,

Designated Federal Official, Office of Science Coordination and Policy, EPA 

9:05 A.M. Introduction and Identification of Panel Members – James McManaman, Ph.D., 

FIFRA Scientific Advisory Panel Session Chair 

9:10 A.M. Follow-up from the Previous Day Discussions 

9:20 A.M. Charge to Panel (Cont’d)

Charge Question 2.3. Please comment on whether the assumptions made in these models are 

appropriate given the current state of the science and data limitations.

10:00 A.M. Charge to Panel

Charge Question 2.4. Please suggest the most important steps EPA should take to improve the 

various kinetic models to provide rapid and cost-effective predictions for large number of 

chemicals. 

10:45 A.M. Break

11:00 A.M. Charge to Panel

Charge Question 2.5. Please comment on the approaches presented in the present White Paper 

for comparing RTK-derived endocrine-active dose ranges with exposure predictions from 

ExpoCast. Discuss the strengths and limitations of these comparisons, and whether this or other 

approaches are suitable for clearly distinguishing chemicals with higher predicted doses from 

chemicals with lower predicted RTK adjusted doses.

12:00 P.M. Lunch

1:00 P.M. Charge to Panel (Cont’d)

Charge Question 3.1. Please comment on the three key areas including whether there are other 

areas that are of equal or higher priority to support an integrated activity/hazard and exposure 

based prioritization and screening approach within the EDSP or other chemical programs.
1:45 P.M. Charge to Panel 

Charge Question 3.2. We propose applying the ExpoCast framework to ecological exposures 

using aggregated water monitoring data to evaluate the predictions of environmental fate and 

transport models. Please identify other data, models or environmental media that may be of 

greater value in the initial model calibration and uncertainty analysis.

2:30 P.M. Break

2:45 P.M. Charge to Panel 

Charge Question 3.3. Please identify other relatively high-throughput sources of exposurerelated information that should be included in these three key areas and suggest how this 

information would be used to help prioritize chemicals.

3:45 P.M. Charge to Panel

Charge Question 3.4. For the HTTK work going forward, please comment on additional studies 

that could be performed or approaches that could be taken to improve rapid and cost efficient 

predictions of TK for large numbers of chemicals. 

4:30 P.M. Closing Remarks – James McManaman, Ph.D., FIFRA Scientific Advisory Panel 

Session Chair 

Fred Jenkins, Ph.D., Designated Federal Official, Office of Science Coordination and Policy, 

EPA 

5:00 P.M. Adjourn

Note: Please be advised that agenda times are approximate; when the discussion for one 

topic is completed, discussions for the next topic will begin. For further information, please 

contact the Designated Federal Official for this meeting, Dr. Fred Jenkins, via telephone: 

(202) 564-3327; fax: (202) 564-8382; or email: jenkins.fred@epa.gov.