vapor intrusion risk Articles

  • Vapor Intrusion: Risks and Challenges

    Vapor Intrusion (VI), defined as the migration of volatile contaminants from the subsurface into the indoor air of overlying buildings, is a major and challenging environmental issue for both regulators and the regulated community—one that continues to elicit heated debate among stakeholders. Eight factors associated with the VI pathway that contribute to its challenging nature are discussed ...

  • Vapor Intrusion Issues Risk Occupants’ Health

    Vapor intrusion occurs when a gaseous substance migrates into a building.  For example, volatile organic compounds and other gases can migrate from contaminated soils and groundwater through cracks in foundations or sewer lines and enter a building.  Vapor intrusion can create an indoor environment that damages structural materials and puts building occupants’ health at ...


    By Ultraviolet Devices, Inc.

  • Customization of Vapor Intrusion Control Solutions

    This is an exciting time in the development of the vapor intrusion control industry.  Significant increases in practitioner skill level and experience and the increased availability of specialized products have resulted in many innovative and customized solutions for addressing the vapor intrusion needs of developers, businesspeople, and attorneys.  This is especially true in three ...

  • Using bioaugmentation to reduce risks and costs associated with vapor intrusion

    The risk driver for remedial action on many sites is potential vapor intrusion hazard. While mitigation of the vapors entering the structure can reduce the risk to an acceptable level, there are associated long-term monitoring, operation and maintenance costs. Bioremediation of the source of vapors can reduce the risk and eliminate long-term costs. The vapor intrusion risk is managed by ...


    By CL Solutions, LLC

  • Sensitivity analysis on parameters and processes affecting vapor intrusion risk

    A one‐dimensional numerical model was developed and used to identify the key processes controlling vapor intrusion risks by means of a sensitivity analysis. The model simulates the fate of a dissolved volatile organic compound present below the ventilated crawl space of a house. In contrast to the vast majority of previous studies, this model accounts for vertical variation of soil water ...


    By John Wiley & Sons, Ltd.

  • New EPA Draft Guidance on Vapor Intrusion

    One of the primary objectives of the Office of Solid Waste and Emergency Response (OSWER) under EPA’s Strategic Plan is stated as: “By 2005, EPA and its state, tribal and local partners will reduce or control the risk to human health and the environment at more than 374,000 contaminated Superfund, RCRA, underground storage tank (UST), brownfields and oil sites, and have the planning and ...

  • U.S. EPA Updates Vapor Intrusion Guidance

    Untitled Document The attention of EPA and state environmental agencies to assessing the vapor intrusion pathway at potentially ...


    By AECOM

  • Overview of Major Changes in EPA Draft Guidance for Vapor Intrusion

    The following provides a brief summary of the Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway From Groundwater and Soils (Subsurface Vapor Intrusion Guidance). November 2002, EPA530-F-02-052. Major Points: This draft guidance supersedes the draft RCRA EI Supplemental Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway (Dec. 2001). It does not supersede ...

  • Vapor intrusion and indoor air quality due diligence during property transactions

    Vapor intrusion (i.e. the migration of volatile chemicals from contaminated soil and/or ground water through the subsurface into overlying building structures) as a contributing indoor air has become a growing concern for property owners and prospective purchasers in recent years as it can cause significant indoor air quality problems. This is largely due to the increased focus on this issue by ...

  • Recent Federal Developments

    TSCA/FIFRA EPA Extends Comment Period For Draft Guidance For Pesticide Registrants On Notifications, Non-notifications, And Minor Formulation Amendments: On October 5, 2017, the U.S. Environmental Protection Agency (EPA) issued a notice of extension of the comment period for the draft guidance  ...


    By Bergeson & Campbell, P.C.

  • Mass to Concentration Tie-In for Passive Soil Gas Surveys: Improved Technique for Source Area, Spatial Variability and Vapor Intrusion Assessment

    Abstract The mass to concentration tie-in [MtoC Tie-In] correlates passive soil gas (PSG) data in mass to active soil gas data in concentration determined by EPA Method TO-17. Passive soil gas surveys consist of rapid deployment of hydrophobic sorbents (dozens to several hundred locations typically installed in one day) to a depth of six-inches to three-feet in a grid pattern with exposure ...

  • When vapors intrude...

    Vapor intrusion (VI) is the migration of gas-phase chemicals from the subsurface into buildings or other structures. It is one of the exposure pathways that should be considered when performing a site human health risk assessment and can be an important issue at sites with subsurface contamination due to petroleum fuels or chlorinated solvents. This article provides a “big picture” overview for ...

  • CETCO gas vapor barrier chosen by risk assessors for mixed-use redevelopment case study

    Project: Pan Am Games Athletes Village Location: Toronto, ON. Canada Products: Liquid Boot® 500 Gas Vapor Mitigation System Background: The site for the Pan Am Athletes Village. a mixed-use redevelopment, is situated on an abandoned piece of property known as West Don Lands. Most of the land was industrial or owned by the ...


    By CETCO

  • CETCO gas vapor barrier chosen by top home builder for site with former oil wells case study

    Project: Palisades at Vista del Verde Location: Yorba Linda, CA Products: Liquid Boot 500 Gas Vapor Mitigation System, GeoVent Gas Venting System Background: The Palisades at Vista del Verde is a multi-family housing development that is situated on a site that once was home to numerous oil wells. The oil wells have since been ...


    By CETCO

  • EPA studies identify techniques for critical leak testing prior to soil-vapor sampling

    Researchers at EPA’s National Risk Management Research Laboratory (NRMRL) in Ada, OK, are developing quality assurance (QA) measures for soil-gas and sub-slab sampling methods that help differentiate contaminant vapors due to vapor intrusion from background sources. Recent research focused on measures to identify leakage of ambient air into conventional vapor probes, which can significantly ...

  • Groundwater Plume, Source and Risk Identification Using Passive Soil Gas

    Abstract The results from sixty passive soil gas (PSG) samplers placed at a grain silo and mixed-use industrial facility with a known chlorinated solvent release aided with the rapid investigation time-schedule. The samplers were used to determine potential sources, plume extent and vapor risks in areas beyond the previous discrete soil sampling and permanent groundwater monitoring well ...

  • Impact of Sampling Media on Soil Gas Measurements

    Abstract To evaluate the vapor intrusion pathway for a building and to assess the associated human health risks, soil gas samples near the building site and under the building foundation may be collected. In order to meet risk assessment goals, the analytical laboratory is often required to report compounds of concern for these soil gas samples down to the part per billion ranges or lower. ...


    By Eurofins Air Toxics Inc

  • Evaluation of Sorbent Methodology for Petroleum-Impacted Site Investigations

    Abstract Soil gas measurements are often used for risk assessment in vapor intrusion investigations. In the case of petroleum-contaminated sites, total petroleum hydrocarbon (TPH) characterization may be required to effectively measure the associated risk. One of the common strategies employed to characterize TPH for risk assessment includes the quantitation of indicator compounds of ...


    By Eurofins Air Toxics Inc

  • Redwood City Case (In Situ Gas Thermal Remediation + C3 Technology (GTR™+C3))

    The former Dry Cleaner site was located in Redwood City, California, contaminated by tetrachloroethylene (PCE). Affected soils also contained low levels of PCE degradation byproducts, such as trichloroethylene (TCE), and were presumed to have an approximate extent of 384 square feet (16’ x 24’ area) to a depth of 10 feet beneath the building. The remediation goal was driven by vapor ...


    By GEO Inc

  • The Application of TO-15 to Naphthalene Measurements in Indoor Air

    Introduction Naphthalene has recently become a compound of concern in many vapor intrusion investigations as a result of its reclassification to a carcinogen by California EPA and its proposed change to a 'likely carcinogen' by the USEPA. Naphthalene is commonly found in petroleum-based fuels and may be present at former manufactured gas plants. To assess the health risk of naphthalene vapor ...


    By Eurofins Air Toxics Inc

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