Winter 2024

What’s New at Gradient

Awards and Announcements


Ifeoluwa A. Bamgbose was awarded a Certificate in Regulatory Sciences from the University of Arkansas for Medical Sciences (UAMS) in August 2023.

Kurt Herman is a licensed Professional Geologist in Oregon.

Hilary J. Robinson has joined the leadership team of the Emerging Contaminants Working Group at EBC New England.



Park, HR; Azzara, D; Cohen, ED; Boomhower, SR; Diwadkar, AR; Himes, BE; O’Reilly, MA; Lu, Q. 2024. “Identification of novel NRF2-dependent genes as regulators of lead and arsenic toxicity in neural progenitor cells.” J. Hazard. Mater. 463:132906. doi: 10.1016/j.jhazmat.2023.132906.

Upcoming Presentations


EBC 5th Annual PFAS Seminar. February 6, 2024. Framingham, MA.

  • “Consumer Products, Septic Systems, and Their Potential Connection to PFAS Contamination.” J. Rice.
  • “Federal Regulatory Highlights: TSCA, TRI, NPDES, CERCLA, MCL, RCRA.” Panel event moderated by H. Robinson.

Energy, Utility & Environment Conference (EUEC) 2024. February 13-15, 2024. Dallas, TX.

  • “A Comparative Life Cycle Assessment of Corrective Action Alternatives to Evaluate Sustainable Remediation.” M. Biega, Q. Zhang, A. Lewis.

Society of Toxicology (SOT) 63rd Annual Meeting & ToxExpo. March 10-14, 2024. Salt Lake City, UT.

  • “Critical Analysis of Sperm Parameter Data Used as the Basis for a Tolerable Daily Intake for Bisphenol A.” M. Hixon, R. Prueitt, J. Goodman.
  • “Critical Evaluation of Immunotoxicity Data Used as the Basis for a Tolerable Daily Intake for Bisphenol A.” R. Prueitt, M. Hixon, J. Goodman.
  • “Using Exposure Duration-Specific Margins of Safety in Compliance with ISO 10993-17:2023 to Characterize the Toxicological Risk of Phthalates.” C. Clarke, P. Piatos, S. Larch, R. Chang.
  • “Protecting Against Adverse Reproductive and Gestational Outcomes from Workplace Exposures: Screening Assessments for Developmental and Reproductive Toxicity.” N. Olgun, M. Hixon, D. Dodge, T. Lewandowski.
  • “Modifications to Toxtree’s Revised Cramer Module in the Context of Cramer Classification Predictions for Medical Device Extractables.” P. Mashankar, B. Cronin, R. Chang, J. Cohen.
  • “Evaluating the Potential for Reproductive Effects from Intermittent Lead Exposures Using Blood Lead Modeling Under Proposition 65.” S. Boomhower, J. Chang, R. Mattuck, B. Beck.
  • “Deriving an Allowable Exposure Limit for Isobornyl Acrylate for Skin Sensitization in Skin-Contacting Consumer Products.” S. Larch, R. Ticknor, I. Mohar, T. Lewandowski.
  • “What is a More Conservative Approach for Risk Assessment? Comparing Materials Characterization Data with an Extractables Profile for a Permanent Orthopedic Implant.” C. Meakin, C. Restrepo, S. Kearing, L. Borton.
  • “Application of a 3D QSAR Approach for the Re-Evaluation of Organophosphorus Compounds for Cohort of Concern Identification.” A. Gauthier, T. Dugan, H. Gadol.
  • “Considerations for Deriving a Safe Intake of Propylene Glycol.” C. Marsh, S. Boomhower, A. Lewis.

Previously Presented


Society for Chemical Hazard Communication (SCHC) 2023 Annual Meeting. September 30-October 5, 2023. Arlington, VA.

  • “The Challenges of Finding and Mitigating PFAS in Supply Chain.” C. Tuit, B. Calder, E. Ritter.

Association of Battery Recyclers (ABR) Fall Meeting. October 19, 2023. Las Vegas, NV.

  • “Update on US EPA Environmental Justice Policies: A Survey of Federal Activities.” A. Lewis.

The Foundation for Natural Resources and Energy Law (FNREL) Water Law Institute 2023. November 2-3, 2023. Chandler, AZ.

  • “Improving Methods to Evaluate Streamflow Impacts from Groundwater Pumping Under Increasing Demand.” M. Tymchak, J. Kondziolka.

BfR International Conference on Using Epidemiological Studies in Health Risk Assessments: Relevance, Reliability and Causality. November 9-10, 2023. Berlin, Germany.

  • “The Impact of Recall and Selection Bias on the Association Between Talc and Ovarian Cancer in Case-Control Studies.” J. Goodman, D. Boon, L. Espira.

Drug Deliver to the Lungs (DDL) 2023. December 6-8, 2023. Edinburgh, UK.

  • “Overview of the Nonclinical Safety Program for 1,1-Difluoroethane (HFA-152a) as a Low Global Warming Potential Metered-Dose Inhaler Propellant.” I. Mohar, T. Lewandowski, S. Johnson, S. Corr, C. Leach.

By The Way… 


In 2023, Detroit opened the country’s first road capable of wirelessly charging electric vehicles.