Soil Vapor Intrusion (SVI) Monitoring

EST has the equipment, resources, and experience to support a variety of soil vapor intrusion (SVI) and indoor air sampling programs. In order to identify chemical vapors that might be migrating through subsurface soils or underground utilities, EST can perform soil vapor intrusion sampling in accordance with applicable DEP guidance documents. As part of these SVI sampling programs, EST can collect indoor air and background air samples in the breathing zone and install a temporary sub-slab sampling port for the collection of sub-slab air samples.

EST’s Vapor Shroud

EST’s vapor shroud is a reliable sub-slab soil gas sampling device that meets all regulatory requirements.  It simplifies the SVI sampling process and can perform Helium leak checks to verify the integrity of the annular seal around the sub-slab vapor point. The shroud has three auto shut-off quick connect ports; one to allow for Helium gas to be added to the shroud, the second to check the amount of Helium in the shroud and the third port to check the sub-slab vapor point for leaks of Helium around the sub-slab vapor point.  EST’s Vapor Shroud is one of the only products on the market specifically designed for SVI sampling and it will save you time and money while maintaining sample integrity.  To learn more, watch our explainer video below.

From Our Customers

Marjorie Merisier

Marjorie Merisier

Environmental Compliance Officer – Dana-Farber Cancer Institute


EST provides Dana Farber with neutralization system maintenance and sampling/analyses for our facilities. I would absolutely recommend them as they provide invaluable expertise and consistent high-level customer service.

Wayne E. Bates, PhD, P.E.

Wayne E. Bates, PhD, P.E.

Principal Engineer – Tighe & Bond


I’ve been working with EST for over ten years on various industrial wastewater projects.  They are highly responsive, affordable, and easy to work with, especially from a sample collection standpoint.  They respect the relationship between the engineer and the client and they consistently provide reliable support and information.

Paul Richard

Paul Richard

Senior Program Director, WOOD PLC


For over twenty years, EST has assisted me with various wastewater and stormwater compliance projects. As an extremely busy project manager, I have high standards and expectations for anyone I’m working with, especially when I’m entrusting them with clients I’m responsible for managing. With EST however, I never have to worry as they are always professional, quick to respond, and they take my client’s compliance needs very seriously. I highly recommend their services.

Chad Kershaw

Chad Kershaw

Project Manager, CDM Smith


When it comes to sewer pipeline services for municipalities, we always reach out to EST. They provide competitive pricing while meeting our often demanding schedule. More importantly, EST completes quality work and quickly gains the trust of our clients. I would recommend them to anyone who needs sewer pipeline investigation work completed.

Arthur J. Cunningham PE

Arthur J. Cunningham PE

LSP Director of Engineering – Capaccio Environmental Engineering, Inc.


One of our most important clients needed wastewater sampling performed and each location had its own unique challenges. We knew EST was resourceful, flexible, had a deep bench, and a can-do attitude so we thought of them to help. The entire EST team made this project a great success for us and our client. We would not hesitate to recommend EST for these and other services as we, and our clients, have had very positive experiences working with them.

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