Air

Staff Environmental Engineer/Geologist/Scientist

Published: 20 August 2021

Sciences Career Fair

Published: 17 August 2021

Environmental Toxicology and Chemistry

Published: 10 August 2021

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai’i, USA

Published: 7 July 2021

Aquatic Sciences

Staff Environmental Engineer/Geologist/Scientist

Published: 20 August 2021

Sciences Career Fair

Published: 17 August 2021

Industry Council on the Environment

Published: 13 August 2021

Work Anniversaries

Published: 13 August 2021

Environmental Toxicology and Chemistry

Published: 10 August 2021

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai’i, USA

Published: 7 July 2021

Compliance/Permitting/Audits

Railroad Commission of Texas Granted UIC Class VI Primacy

Published: 2 December 2025

Sciences Career Fair

Published: 17 August 2021

Due Diligence

SETAC North America 44th Annual Meeting

Published: 17 November 2023

Staff Environmental Engineer/Geologist/Scientist

Published: 20 August 2021

Sciences Career Fair

Published: 17 August 2021

Industry Council on the Environment

Published: 13 August 2021

Work Anniversaries

Published: 13 August 2021

Environmental Toxicology and Chemistry

Published: 10 August 2021

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai’i, USA

Published: 7 July 2021

Energy/Minerals

expertise in Environmental Assessment, Water Resources, Geochemistry, NEPA, CERCLA, Renewables, and Permitting for the Mining, Agriculture, Industrial, and Energy sectors in Montana

GSI Expands into Montana

Published: 9 January 2024

Sciences Career Fair

Published: 17 August 2021

Work Anniversaries

Published: 13 August 2021

Environmental Toxicology and Chemistry

Published: 10 August 2021

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai’i, USA

Published: 7 July 2021

Environmental Analytics

A combined 228Ra/226Ra and 87Sr/86Sr approach to identify the production of out-of-zone formation fluid from Marcellus shale gas wells

Published: 7 November 2025

Food/Product Safety

regulatory criteria to perfluoropolyethers

A critical review of the application of polymer of low concern and regulatory criteria to perfluoropolyethers

Published: 26 August 2025

Fish Consumption Advisory Calculator

Published: 30 May 2025

Sciences Career Fair

Published: 17 August 2021

Work Anniversaries

Published: 13 August 2021

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai’i, USA

Published: 7 July 2021

Government

Join GSI at the Department of Defense's (DoD) Energy and Environment Innovation Symposium in Arlington, Virginia

Join GSI at the Department of Defense’s (DoD) Energy and Environment Innovation Symposium in Arlington, Virginia

Published: 25 November 2023

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai’i, USA

Published: 7 July 2021

Groundwater

Railroad Commission of Texas Granted UIC Class VI Primacy

Published: 2 December 2025

A combined 228Ra/226Ra and 87Sr/86Sr approach to identify the production of out-of-zone formation fluid from Marcellus shale gas wells

Published: 7 November 2025

MODFLOW-USG Software Update 2.6.0

Published: 16 October 2025

Industrial

regulatory criteria to perfluoropolyethers

A critical review of the application of polymer of low concern and regulatory criteria to perfluoropolyethers

Published: 26 August 2025

Litigation Support

Sciences Career Fair

Published: 17 August 2021

Modeling

Charles J. Newell and David T. Adamson: "A Long Way to Go: Challenges and Strategies for Managing PFAS in Groundwater" explores national-scale PFAS remediation strategies.

A Long Way to Go: Challenges and Strategies for Managing PFAS in Groundwater

Published: 26 August 2025

USG-Transport

Take a look at the update to USG-Transport, now available from GSI!

Published: 8 March 2024

Chuck Newell, Vice President/Principal Engineer, has been singularly honored with the prestigious 2024 Gordon Maskew Fair Award from the American Academy of Environmental Engineers and Scientists (AAEES)

Gordon Maskew Fair Award

Published: 15 December 2023

Sciences Career Fair

Published: 17 August 2021

News

Railroad Commission of Texas Granted UIC Class VI Primacy

Published: 2 December 2025

A combined 228Ra/226Ra and 87Sr/86Sr approach to identify the production of out-of-zone formation fluid from Marcellus shale gas wells

Published: 7 November 2025

MODFLOW-USG Software Update 2.6.0

Published: 16 October 2025

regulatory criteria to perfluoropolyethers

A critical review of the application of polymer of low concern and regulatory criteria to perfluoropolyethers

Published: 26 August 2025

aqueous film-forming foam (AFFF)

Characteristics of aqueous film forming foam (AFFF) sites impacted with per- and polyfluoroalkyl substances (PFAS): A 37-site study

Published: 29 July 2025

PFAS analytical methods – A practical guide

Published: 23 July 2025

PFAS Monitored Retention: A Framework for Managing PFAS-Contaminated Groundwater Sites

Published: 18 July 2025

Fish Consumption Advisory Calculator

Published: 30 May 2025

GSI is a 2025 Hot Firm

Published: 30 May 2025

GSI is a Hot Firm

Published: 21 August 2024

Graphic and Press Release Attached

Congrats to Dr. Janet Anderson, PhD, DABT!

Published: 31 May 2024

GSI is proud to be on the team!

Published: 8 April 2024

JOIN US! –> TRRP Training Program – May 1-2, 2024

Published: 20 February 2024

expertise in Environmental Assessment, Water Resources, Geochemistry, NEPA, CERCLA, Renewables, and Permitting for the Mining, Agriculture, Industrial, and Energy sectors in Montana

GSI Expands into Montana

Published: 9 January 2024

SERDP + ESTCP Webinar Series

Published: 23 January 2023

Changing of the Guard but Not the Goal

Published: 14 October 2022

Dr. Sorab Panday Won a Lifetime Achievement Award!

Published: 21 September 2022

Carbon Capture and Sequestration

Inflation Reduction Act Expands CCUS Incentives

Published: 17 August 2022

Novel PFAS Treatment Wins the Excellence in Capstone Engineering Design Award at Rice University

Published: 4 May 2022

TCEQ Environmental Trade Fair & Conference

Published: 3 May 2022

ISMAR11

Published: 8 April 2022

Remediation Journal Top Cited Article 2020-2021

Published: 31 March 2022

Proposed California Stormwater Permit for Commercial, Industrial, and Institutional Facilities (CII Permit)

Published: 23 March 2022

GSI in ESTCP Blog

Published: 25 February 2022

GSI Presenting at Dallas Bar Association

Published: 24 February 2022

GSI on the EPA’s Science Advisory Panel

Published: 22 February 2022

Now Hiring for an Environmental Data Manager

Published: 16 February 2022

PFAS Experts Symposium 2: PFAS Toxicology and Risk Assessment

Published: 8 February 2022

PFAS Experts Symposium 2: Evolution from past to present, current efforts, and potential futures

Published: 7 February 2022

January Anniversaries

Published: 3 February 2022

USG-Transport Update

Published: 1 February 2022

ZERO OSHA recordables

Published: 26 January 2022

USEPA UIC Class VI Injection

Published: 25 January 2022

Kindergarten Class Geology Presentation

Published: 21 January 2022

New Jersey Ground Water PFAS News

Published: 20 January 2022

Vapor Intrusion Update

Published: 19 January 2022

How to Identify and Manage PFAS Risks in CRE Transactions Webinar

Published: 14 January 2022

New Publication on PFAS

Published: 13 January 2022

December Anniversaries

Published: 10 January 2022

Houston Holiday Party

Published: 17 December 2021

ESTCP New Project Spotlight

Published: 16 December 2021

Successful Infill Redevelopment Project

Published: 15 December 2021

November Anniversaries

Published: 13 December 2021

Now Hiring in Oakland, California

Published: 10 December 2021

Three GSI ESTCP Proposals Selected for Funding

Published: 9 December 2021

2021 UTA Oil & Gas Conference

Published: 7 December 2021

New Publication

Published: 6 December 2021

GSI Posters at 2021 SERDP & ESTCP Symposium

Published: 3 December 2021

MSECA 2021 Virtual Environmental Conference

Published: 2 December 2021

Dr. Dave Adamson Presenting at 2021 SERDP & ESTCP Symposium 

Published: 1 December 2021

Dr. Stephen Richardson Presenting at 2021 SERDP & ESTCP Symposium 

Published: 30 November 2021

Congratulations Dr. Evelyn Reátegui-Zirena Ph.D, DABT 

Published: 29 November 2021

Two New PFAS Papers

Published: 24 November 2021

Proud Sponsor of The Groundwater Project

Published: 17 November 2021

October Anniversaries

Published: 15 November 2021

Environmental Sources, Chemistry, Fate, and Transport of Per- and Polyfluoroalkyl Substances: State of the Science, Key Knowledge Gaps, and Recommendations Presented at the August 2019 SETAC Focus Topic Meeting

Published: 12 November 2021

Industry Council on the Environment

Published: 10 November 2021

Industrial Stormwater Services

Published: 22 October 2021

Employee Anniversaries

Published: 19 October 2021

Virtual PFAS Workshop

Published: 14 October 2021

In a Pickle Festival

Published: 16 September 2021

New PFAS Analytical Method

Published: 15 September 2021

Entry-Level Environmental Engineer/Scientist/Geologist in Austin, Texas

Published: 9 September 2021

August Anniversaries

Published: 8 September 2021

Regulatory Update

Published: 13 August 2021

PFAS & Emerging Contaminants

MODFLOW-USG Software Update 2.6.0

Published: 16 October 2025

Charles J. Newell and David T. Adamson: "A Long Way to Go: Challenges and Strategies for Managing PFAS in Groundwater" explores national-scale PFAS remediation strategies.

A Long Way to Go: Challenges and Strategies for Managing PFAS in Groundwater

Published: 26 August 2025

regulatory criteria to perfluoropolyethers

A critical review of the application of polymer of low concern and regulatory criteria to perfluoropolyethers

Published: 26 August 2025

aqueous film-forming foam (AFFF)

Characteristics of aqueous film forming foam (AFFF) sites impacted with per- and polyfluoroalkyl substances (PFAS): A 37-site study

Published: 29 July 2025

PFAS analytical methods – A practical guide

Published: 23 July 2025

PFAS Monitored Retention: A Framework for Managing PFAS-Contaminated Groundwater Sites

Published: 18 July 2025

Chuck Newell, Vice President/Principal Engineer, has been singularly honored with the prestigious 2024 Gordon Maskew Fair Award from the American Academy of Environmental Engineers and Scientists (AAEES)

Gordon Maskew Fair Award

Published: 15 December 2023

SETAC North America 44th Annual Meeting

Published: 17 November 2023

Regulatory Update on PFOA and PFOS

Published: 27 October 2021

Expert Analysis Paper on California PFAS Consumer Product Regulations

Published: 25 October 2021

Comment on “Fracking with Forever Chemicals” by Physicians for Social Responsibility, issued July 2021

Published: 3 September 2021

Staff Environmental Engineer/Geologist/Scientist

Published: 20 August 2021

Industry Council on the Environment

Published: 13 August 2021

Work Anniversaries

Published: 13 August 2021

Environmental Toxicology and Chemistry

Published: 10 August 2021

Exposure Pathways of Nontuberculous Mycobacteria Through Soil, Streams, and Groundwater, Hawai’i, USA

Published: 7 July 2021

R&D

A combined 228Ra/226Ra and 87Sr/86Sr approach to identify the production of out-of-zone formation fluid from Marcellus shale gas wells

Published: 7 November 2025

Sciences Career Fair

Published: 17 August 2021

Real Estate

Sciences Career Fair

Published: 17 August 2021

Site Investigation & Remediation

Charles J. Newell and David T. Adamson: "A Long Way to Go: Challenges and Strategies for Managing PFAS in Groundwater" explores national-scale PFAS remediation strategies.

A Long Way to Go: Challenges and Strategies for Managing PFAS in Groundwater

Published: 26 August 2025

Sustainable remediation column – Experts’ perspectives on the past and future of the practice

Published: 13 October 2021

Stormwater

Industry Council on the Environment

Published: 13 August 2021

Sustainability & Climate

Sustainable remediation column – Experts’ perspectives on the past and future of the practice

Published: 13 October 2021

Industry Council on the Environment

Published: 13 August 2021

Sustainability & Climate Articles

CARB’s Climate Disclosure Checklist: Navigating SB 253 and 261

Published: 17 September 2025

greenwashing regulations

Why CA SB 343 Demands Immediate Attention

Published: 16 July 2025

climate risk scenario planning

Resilience by Design: Turning Climate Uncertainty into Business Strength

Published: 1 July 2025

California climate disclosure laws

A Comparative Analysis of California Senate Bill 219 and Other Global Reporting Regulatory Frameworks

Published: 24 June 2025

CSRD and sustainability reporting

Key Take-Aways from Reuters Sustainability Reporting Europe Conference 2025

Published: 19 June 2025

climate-related financial risk management

Integrating Climate-related Risks into Existing Risk Management

Published: 13 June 2025

CARB climate reporting update

CARB May Update: New insight provided into California Climate Disclosure roadmap

Published: 1 June 2025

California climate disclosure laws

What do stakeholders say about CA SB 261 and SB 253? Public Commentary Summarized.

Published: 29 May 2025

SB 219 compliance California

Navigating Climate Disclosures: Article Series on CA SB 219

Published: 14 May 2025

Greenhouse gas (GHG) verification

Ensuring a Smooth GHG Verification: Best Practices for Inventory Preparers

Published: 27 March 2025

Toxicology & Risk Assessment

regulatory criteria to perfluoropolyethers

A critical review of the application of polymer of low concern and regulatory criteria to perfluoropolyethers

Published: 26 August 2025

Industry Council on the Environment

Published: 13 August 2021

Water

USG-Transport

Take a look at the update to USG-Transport, now available from GSI!

Published: 8 March 2024

Chuck Newell, Vice President/Principal Engineer, has been singularly honored with the prestigious 2024 Gordon Maskew Fair Award from the American Academy of Environmental Engineers and Scientists (AAEES)

Gordon Maskew Fair Award

Published: 15 December 2023

Join GSI at the Department of Defense's (DoD) Energy and Environment Innovation Symposium in Arlington, Virginia

Join GSI at the Department of Defense’s (DoD) Energy and Environment Innovation Symposium in Arlington, Virginia

Published: 25 November 2023

Water Resources

expertise in Environmental Assessment, Water Resources, Geochemistry, NEPA, CERCLA, Renewables, and Permitting for the Mining, Agriculture, Industrial, and Energy sectors in Montana

GSI Expands into Montana

Published: 9 January 2024

Chuck Newell, Vice President/Principal Engineer, has been singularly honored with the prestigious 2024 Gordon Maskew Fair Award from the American Academy of Environmental Engineers and Scientists (AAEES)

Gordon Maskew Fair Award

Published: 15 December 2023

Join GSI at the Department of Defense's (DoD) Energy and Environment Innovation Symposium in Arlington, Virginia

Join GSI at the Department of Defense’s (DoD) Energy and Environment Innovation Symposium in Arlington, Virginia

Published: 25 November 2023

Filter By Technical Topics

Filter By Categories