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INTERA’s History with The Adjoint Method

April 4, 2026

The adjoint method for computing sensitivities was developed and applied to reservoir modeling in the mid-1970s by French mathematician Chavent et al. (1971, 1975). The method was brought to the US in 1979 by Ghislain DeMarsily during his time at...

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PFAS in Focus: Expert Insights from INTERA’s Dr. Kim Ralston-Hooper

May 27, 2025

Dr. Kimberly Ralston-Hooper is a Principal Scientist and Ecological Risk Assessment Specialist at INTERA with nearly 30 years of experience evaluating the impacts of environmental contaminants. A national leader in PFAS science, Kim currently supports the Department of Energy’s Hanford...

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PM2.5 – EPA Pre-Releases Annual NAAQS Revision

February 27, 2024

By Joe Peré, Technical Director of Air Quality Particulate matter less than 2.5 microns in size – known as PM2.5 or “fine particulate matter” – is classified as one of the six criteria pollutants that is federally regulated under the...

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Composite Analysis Approved by DOE’s LFRG After More than 22 Years

October 9, 2023

On August 9, 2023, the U.S. Department of Energy’s Federal Low-Level Waste Disposal Facility Review Group (LFRG) voted to approve the Compliance Evaluation of DOE/RL-2019-52 Rev. 2, the Hanford Site’s Composite Analysis (CA). This approval is the successful culmination of...

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PM_2.5 – NAAQS Redesignation is Forthcoming

November 4, 2022

*Update to PM2.5 – NAAQS blog post can be found here: https://www.intera.com/pm2-5-epa-pre-releases-annual-naaqs-revision/ Particulate matter less than 2.5 microns in size – known as PM2.5 or “fine particulate matter” – is classified as one of the six criteria pollutants that is...

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EPA Announces Plans To Strengthen Enforcement and Advance Environmental Justice

May 21, 2021

On April 30, 2021, EPA Acting Assistant Administrator for Enforcement and Compliance Assistance, Lawrence E. Starfield, a longtime US Environmental Protection Agency (EPA or Agency) attorney and senior manager, released a memorandum to EPA’s Office of Enforcement and Compliance Assurance...

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INTERA’s History with The Adjoint Method

PFAS in Focus: Expert Insights from INTERA’s Dr. Kim Ralston-Hooper

PM2.5 – EPA Pre-Releases Annual NAAQS Revision

Composite Analysis Approved by DOE’s LFRG After More than 22 Years

PM_2.5 – NAAQS Redesignation is Forthcoming

EPA Announces Plans To Strengthen Enforcement and Advance Environmental Justice

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INTERA’s History with The Adjoint Method

PFAS in Focus: Expert Insights from INTERA’s Dr. Kim Ralston-Hooper

PM2.5 – EPA Pre-Releases Annual NAAQS Revision

Composite Analysis Approved by DOE’s LFRG After More than 22 Years

PM2.5 – NAAQS Redesignation is Forthcoming

EPA Announces Plans To Strengthen Enforcement and Advance Environmental Justice

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PM_2.5 – NAAQS Redesignation is Forthcoming