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Helen Dawson

Geosyntec Practitioners Contribute to ESTCP Final Report on Vapor Intrusion Assessment

2026-03-17T13:59:28-06:00January 5th, 2026|Tags: , , |

Helen Dawson, PhD, and Todd McAlary, PhD, PEng, PG, coauthored the Environmental Security Technology Certification Program (ESTCP) Final Report, “Mass Flux Characterization for Vapor Intrusion Assessment.”

Geosyntec Moves to a New Office Location in Downtown Washington, D.C.

2026-03-15T10:23:27-06:00February 14th, 2022|Tags: , , , |

Geosyntec is providing services to new and existing clients from our new Washington, D.C. location at 1900 L Street NW, Suite 975 Washington, D.C. 20036. Our office is conveniently located between the K Street corridor and DuPont Circle, in the heart of DC and within walking distance of the Red/Blue/Orange/Silver lines of the Metro. 

Geosyntec Practitioners Participated in Webinar on Vapor Intrusion and PFAS for American Bar Association

2026-03-15T10:23:08-06:00October 18th, 2021|Tags: , , |

Helen Dawson, Ph.D. (Washington, D.C.) and Dylan Eberle, Ph.D. (Massachusetts) presented the webinar titled "Recent Developments in Vapor Intrusion and Environmental Forensics" for the American Bar Association at 12 pm EDT on October 5, 2021. Travis Kline. MEM (Washington, D.C.) moderated the discussion.

Geosyntec Technical Webinar Series

2026-03-15T10:22:45-06:00May 19th, 2021|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

For more information about the events, contact:

Vapor Intrusion Due Diligence

2026-09-30T14:10:05-06:00December 6th, 2019|Tags: , , , , , , , |

Our clients who are managing vapor intrusion (VI) issues during a fast-paced property transaction require a partner who understands remediation, mitigation, institutional controls, regulatory compliance, and risk communication.

Vapor Intrusion Mitigation

2026-08-21T13:52:17-06:00December 6th, 2019|Tags: , , , , , , , , , , |

Thinking beyond standard mitigation systems. With thousands of commercial, industrial, and residential buildings mitigated by our experts within the last 20 years, we know where to find cost-saving opportunities while maintaining or improving system effectiveness.

Vapor Intrusion Site Characterization

2026-08-21T13:50:19-06:00December 6th, 2019|Tags: , , , , , |

Vapor intrusion or background sources? With the potential for human health concerns, our clients cannot wait. Our techniques and forensic tools provide clients with rigorous, defensible data as quickly as possible: Building pressurization control (BPC) Real-time field tests (e.g., portable GC/MS, mobile labs) Mass flux testing Passive indoor air and soil vapor sampling, with tools like the Waterloo Membrane Sampler™

Geosyntec Team to Present at the 2019 Southeast Brownfields Conference

2026-03-15T10:21:42-06:00October 25th, 2019|Tags: , , , , |

David Latham, PG, Eric Sager, P.G. (Florida), Lydia Dorrance, Ph.D. (California), and Helen Dawson, Ph.D. (Washington D.C.), are presenting on multiple topics at the 2019 Southeast Brownfields Conference at the DoubleTree Universal Orlando in Orlando, Florida on October 27-30, 2019.

Congratulations to Newly Promoted Senior Principals in 2019

2026-03-15T10:21:22-06:00April 24th, 2019|Tags: , , , , , , , , |

Geosyntec is pleased to announce the promotion of Arthur Forma, Helen Dawson, Julie Konzuk, Paul Botek, Rebecca Daprato, Stefanie Fountain, Syed Rehan, Tom Ramsey, and Warren Brady to the position of Senior Principal within the Geosyntec family of companies.

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