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EPA vapor intrusion fact Sheet

Fact Sheet on Evaluating the Vapor Intrusion into - EP

Vapor Intrusion US EP

EPA has developed this fact sheet to answer frequently asked questions about an important health issue known as vapor intrusion. Vapors and gases from contaminated groundwater and soil have the potential to seep into indoor spaces and cause health problems Illinois EPA is preparing fact sheets to help cleanup program participants understand and comply with the indoor inhalation amendments. We're also coordinating with the Illinois Environmental Regulatory Group to offer training webinars in the spring. Details will be posted here when available. In the meantime, here are answers to common questions about the proposed rule

Vapor Intrusion Fact Sheet Exposure to Toxic Chemicals Fact Sheet TCE Fact Sheet EPA Access Agreement for Sampling Vapor Intrusion Action Memo (TCE Site) Residence Assesment Form (VOC & Petroleum Site) EPA On-Line Tool (Johnson Ettinger Model) SSDS Annual Inspection Form Many Other Reference and Example Documents 2015 Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway. This page contains the a downloadable PDF of the NAPL Model Fact Sheet for Correcting the Henry's Law Constant for Temperature. Fact Sheet for Correcting the Henry's Law Constant for Temperature | Vapor Intrusion | US EPA What You Should Know About Vapor Intrusion Introduction EPA has developed this fact sheet to answer frequently asked questions about an important health issue known as vapor intrusion. Vapors and gases from contaminated groundwater and soil have the potential to seep into indoor spaces and cause health problems. Vapor Intrusion into Indoor Ai

This Fact Sheet summarizes DEQ policy on the evaluation and mitigation of vapor intrusion in the Voluntary Remediation Program (VRP) and describes guidance that has been developed by DEQ to assist Volunteers in addressing vapor intrusion when making cleanup decisions about their sites. DEQ expects that Volunteers will refer to this Fact Sheet in conjunction with other applicabl associated with vapor intrusion may be recommended. Mitigation may in-clude installing a sub-slab depressuri-zation system be-neath the building. A sub-slab depres-surization system, much like a radon mitigation system, essentially prevents vapors beneath a slab from entering a building. S ITE H ISTORY The North Penn Area 12 site includes the former Tran-sicoil facility (within the solid line. Vapor Intrusion Mitigation in Existing Buildings Fact Sheet Navy Alternative Restoration Technology Team, NFESC, 6 pp, 2011. This fact sheet provides a brief overview of methods that can be used to mitigate VI in existing buildings along with important considerations for selecting and designing an appropriate mitigation system for your site Fact Sheet: Development on Properties with a Vapor Intrusion Threat ‒ July 2019 The San Francisco Bay Regional Water Board (Regional Water Board) oversees an increasing number of cleanups at properties where volatile organic compounds (VOCs) are present in soil vapor and development is occurring. These VOCs can pose a healt

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Technical and Emerging Contaminant Fact Sheets. EPA published the following technical fact sheets, which provide brief summaries of contaminants of concern that present unique issues and challenges to the environmental community and EPA at contaminated federal facility sites. Each fact sheet provides a brief summary of the contaminant, including physical and chemical properties, environmental and health impacts, existing federal and state guidelines, and detection and treatment. Vapor Intrusion and Your Health Fact Sheet (general overview of vapor intrusion): English / Spanish. Vapor Intrusion Guidance Documents. Flow Diagram of DTSC Vapor Intrusion Documents . Advisory - Active Soil Gas Investigations (July 2015) This Cal EPA Advisory was jointly revised and updated July 2015 by DTSC, Los Angeles Regional Water Quality Control Board (LARWQCB), and San Francisco.

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  1. IDEM Fact Sheet VA0316L - 0818 Vapor Intrusion 1 of 2 Introduction Chemicals from dry cleaning, degreasers or even gasoline can cause concern when they are spilled or leak into soil or groundwater. These chemical spills can be recent or from a long time ago. Chemicals can move through the soil and mix with groundwater; they can evaporate from soil and groundwater, and the gas (vapor) can then.
  2. DoD Vapor Intrusion Handbook Fact Sheet Update No: 005 Date: September 2017 _____ Use of Tracers, Surrogates, and Indicator Parameters in Vapor Intrusion Assessment Purpose This fact sheet, which was prepared by the Department of Defense (DoD) Tri-Services Environmental Risk Assessment Workgroup (TSERAWG), relates to Sections 2.1, 3.5 and 3.3.5 and Appendices G, H and I of the DoD Vapor.
  3. This fact sheet was prepared by the Department of Defense (DoD) Tri-Service Environmental Risk Assessment Workgroup (TSERAWG) to provide a roadmap for DoD Project Managers assessing the vapor intrusion (VI) pathway at DoD facilities under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)

What You Should Know About Vapor Intrusion - US EP

To help the CAlEPA Vapor Intrusion Workgroup to organize comments, please use one of the designated comment forms and electronically submit your comments to the email provided below. The work group offers Comment Form A (Adobe® Version) and Comment Form B (Microsoft® Word Version). Alternatively, you may also submit your comments in a letter (or email) drafted in the official format of your agency or company, or in a format of your choosing Vapor Intrusion - General . EPA Vapor Intrusion Mitigation Approaches; Massachusetts An Evaluation of Vapor Intrusion Into Buildings through a Study of Field Data (1996) New Jersey Vapor Intrusion Guidance Documents; Pennsylvania VI Guidance; Wisconsin DHFS VI Fact Sheet; Vapor Intrusion Resources for Environmental Professional Additionally, EPA will conduct vapor intrusion monitoring at the two buildings two more times this year. EPA will begin the soil gas and groundwater monitoring activities in the area surrounding Buildings 50 and 52 in July 2010. These investigations are a follow-up to the vapor intrusion work previously conducted in the buildings. It is. Fact Sheets; Vapor Intrusion Study to Begin, Clinton Coal Gas Superfund Site, Clinton, Iowa, January 2009; Fact Sheet January 2009. Vapor Intrusion Study to Begin, Clinton Coal Gas Superfund Site, Clinton, Iowa . INTRODUCTION. The U.S. Environmental Protection Agency (EPA) Region 7 has been overseeing site investigation and cleanup activities related to the coal tar contamination at the. Vapor Intrusion is the upward migration of contaminants, in vapor phase, into structures and occupied buildings from underlying contaminated ground water or soil. Evaluating this potential exposure pathway is accomplished though vapor sampling of Soil Gas, Sub-Slab Gas or Vapors, and Indoor Air. Each of these distinctive sampling activities involves a step- wise process whereby sample.

&EPA What You Should Know About United States Vapor Intrusion Environmental Protection ± Agency EPA has developed this fact sheet to answer some of the most commonly asked questions about an important health issue called vapor intrusion. Vapors and gases from contaminated groundwater and soil have the potential to seep into indoor spaces and cause health problems. What is vapor intrusion. PURPOSE This fact sheet provides an overview of technical and health issues regarding chemical vapor intrusion into indoor air, and how to address these issues to foster land redevelopment. This document will discuss how to: • anticipate the potential for vapor intrusion; • evaluate the extent of the problem; and • prevent or correct the problem. BACKGROUND EPA's mission is to protect. FACT SHEET Continuous Monitoring for Vapor Intrusion Introduction The assessment of vapor intrusion (VI) is complicated by a high degree of spatial and temporal variability. This fact sheet will focus on recent applications of a continuous monitoring (CM) technology that provides quantitative measurements of vapor concentrations in the field. CM can help to address site-specific building.

Vapor Intrusion - Vapor Intrusion - Illinoi

Conceptual Model Scenarios for the Vapor Intrusion Pathway. EPA 530-R-10-003. Section 6.3 Atmospheric and Indoor Air Pressure Fluctuations. Office of Solid Waste and Emergency Response, Washington, DC. U.S. EPA. 1993. Radon Reduction Techniques for Existing Detached Houses, Technical Guidance (Third Edition) for Active Soil Depressurization Systems. EPA/625/R-93/011. Section 3.5.4. It's important to note that topics detailed in the Public Outreach During Vapor Intrusion Mitigation Fact Sheet should be followed at every step in the VI mitigation process—from initial site characterization to follow-up and maintenance for the life of the building. 2 Overview of Overarching VI mitigation TOPICS Fact sheets . Two fact sheets, Conceptual Site Models for Vapor Intrusion. This fact sheet is supported by a Vapor Intrusion Mitigation Conceptual Site Model Checklist of information that may be beneficial to enhance the VI CSM for the purposes of evaluating mitigation alternatives. 2.1 Checklist to Enhance the VI CSM for Evaluation of Mitigation Strategies. This checklist assumes that VI site characterization has been completed and the user has reviewed the existing. In September 1998, EPA developed a series of models for estimating indoor air concentrations and associated health risks from subsurface vapor intrusion into buildings. These models were based on the analytical solutions of Johnson and Ettinger (1991) for contaminant partitioning and subsurface vapor transport into buildings

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Site Profile - Vapor Intrusion ToolBox - EPA OSC Respons

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Investigating Vapor Intrusion What is vapor intrusion? Vapor intrusion is a way that volatile chemicals (see text box) in soil and groundwater can enter and build up inside buildings. When chemicals spill or leak into the ground, they can contaminate the soil and the groundwater. Depending on the type and amount, these chemical vapors can possibly affect your health if you breathe them in. Vapor Intrusion. For more information about vapor intrusion at Camp Lejeune, please see: EPA fact sheet: A Citizen's Guide to Vapor Intrusion Mitigation. The Navy and Marine Corps Public Health Center has also developed the following videos about vapor intrusion This fact sheet is intended to provide a high†level overview and offer reference to resources that detail the application and analysis of passive sampling for VI. Real-Time Monitoring for Vapor Intrusion Assessment, Fact Sheet Update No. 002 Tri-Service Environmental Risk Assessment Workgroup. 9 pp. February 2017 EPA Vapor Intrusion Workshop Measurement-Based Methods for Protective & Defensible Chlorinated VI Exposure Determinations 35 th Annual International Conference on Soils, Sediments, Water, and Energy, Amherst, Massachusetts, October 22 nd, 2019. Methods for Measuring Temperature, Pressure and Radon What, Where, When, and How? Chris Lutes, Jacobs. Mention of trade names and commercial products ITRC has developed a series of fact sheets that summarizes the latest science, engineering, and technologies regarding vapor intrusion (VI) mitigation. This fact sheet describes the most common active vapor mitigation technologies and summarizes the considerations that go into design, installation, post-installation verification, and operation, maintenance, and monitoring (OM&M)

Fact Sheet for Correcting the Henry's Law Constant - EP

  1. The U.S. EPA Vapor Intrusion Screening Level Calculator (VISL) and VISL User Guide [exit DNR] For more information about vapor intrusion and health, visit the DHS website [exit DNR] or view their vapor intrusion fact sheet: Health Hazards: Vapor Intrusion [PDF exit DNR] Study referenced in DNR's April 6, 2021, letter to Responsible Parties: A Systemic Evaluation of the Potential Effects.
  2. ated soil and groundwater. These remediation objectives protect human health and take into account site conditions and land use. Remediation objectives generated by TACO are.
  3. ation in soil or ground water enter nearby buildings through cracks and holes in the foundations or slabs or via crawl spaces. In general, the goal at these sites is to remove the source of the vapors by cleaning up the conta
  4. [link to DoD 2009] are described in this fact sheet. Vapor Intrusion Assessment Challenges Addressed with Real-Time Monitoring Spatial and temporal variability are two common challenges with vapor intrusion assessment. Within a given building, the entry point(s) for vapors can be few or many, are generally irregularly spaced, and may be obscured from view by floor coverings, furniture or walls.

MOU USCG 9th District and EPA Region 5. Tools. Overvie Fact Sheets. IDEM; Current: Fact Sheets Table of Contents. Office of Air Quality. Air Compliance ; Air Quality Vapor Intrusion [PDF] IDEM has guidance to help you find an environmental consultant. Site Investigation . 0153 Ground Water Contamination Site [PDF] Canal Road Groundwater Contamination Site [PDF] East 165th Street Soil Contamination Site [PDF] ESI Environmental, Inc. This fact sheet is intended for schools located on properties where soil and/or groundwater contamination has been or is being remediated under one of the Illinois EPA's Remediation Programs. On May 16, 2013, the Illinois Pollution Control Board added the indoor inhalation exposure route to Illinois EPA's risk-based cleanup methodology called the Tiered Approach to Corrective Action Objectives. This report was peer reviewed under a different working title: U.S. EPA's Vapor Intrusion Database: Preliminary Evaluation of Attenuation Factors. Technical Resources for Vapor Intrusion Mitigation Interstate Technology & Regulatory Council (ITRC) Vapor Intrusion Mitigation Team, Report No: VIM-1, 2021 ITRC has developed nine fact sheets and one technology information sheet for emerging.

CLU-IN Issues > Vapor Intrusion > Mitigatio

Previous Environmental Site Assessment by the EPA TBA Program conducted in 2009 revealed high concentrations of PCE in soil gas samples at depths ranging from 5 to 20 feet bgs both on and off-site. PCE concentrations in soil gas ranged from 66,000 ug/m3 to 9.7 x 106 ug/m3. All soil gas concentrations exceeded the California Human Health Screening Level for PCE in soil vapor of 180 ug/m3. This. Fact Sheet #1 June 2003 The Illinois EPA and the Illinois AGO have since approached oil companies that have operated in the area or used these pipelines, to assist in finding an interim remedy for the short term as well as a long-term solution to this vapor intrusion problem. Who is responsible for the problem? Identification of the responsible parties is a complex issue due to many. Sub-slab Depressurization (SSD) Active Mitigation Systems (uses electric fan) This ITRC Technology Information Sheet provides basic information when using a fan to depressurize soil or a small air space below a sealed membrane barrier, usually placed on the exposed dirt floor of a crawlspace (or dirt floor basement) to mitigate potential vapor intrusion (VI) into a building Federal Remediation Technologies Roundtable Annual Summary of Activities: August 2010—Highlighting Vapor Intrusion (EPA-530-F-10-001) This fact sheet, produced by the FRTR, summarizes activities of member agencies remediation programs and describes recently published cost and performance case studies and reports. The 2010 fact sheet also. August 2016 EPA April/May 2016 Sampling Investigation Results Fact Sheet April 2016 EPA Sampling Activities in April and May 2016 Fact Sheet April 27, 2016 Grenada Manufacturing, LLC, Vapor Intrusion Presentation, Grenada, Mississipp

AUGUST 2010 - HIGHLIGHTING VAPOR INTRUSION This fact sheet summarizes the activities of the Federal Remediation Technologies Roundtable (FRTR) over the last year. The FRTR is an interagency working group that promotes cooperation among member agencies to promote development and use of new technologies for improved remediation of hazardous waste sites. Primary members of the FRTR include the U. Recent Events: EPA's 2021 State of VI Science Workshop Session at AEHS: Reducing Vapor Intrusion Uncertainties by More Frequent Simple Measurements and Community Involvement, Monday, March 22. Agenda Download Agenda; Abstract Download Abstract; Presenter Bios Download Bios; Session video Watch Full Session Video; Welcome and Overview — Sponsors, IAVI website, key definition

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Emerging Contaminants and Federal Facility - US EP

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  2. Brownfields 2018 Job Training Grant Fact Sheet Groundwork Rhode Island Printable PDF (1-2pp, 25k) EPA Brownfields Program. EPA's Brownfields Program empowers states, communities, and other stakeholders to work together to prevent, assess, safely clean up, and sustainably reuse brownfields. A brownfield site is real property, the expansion, redevelopment, or reuse of which may be complicated by.
  3. Brownfields 2017 Job Training Grant Fact Sheet Salish Kootenai College, Flathead Indian Reservation, MT Printable PDF (1-2pp, 25k) EPA Brownfields Program. EPA's Brownfields Program empowers states, communities, and other stakeholders to work together to prevent, assess, safely clean up, and sustainably reuse brownfields. A brownfield site is real property, the expansion, redevelopment, or.
  4. ants, in vapor phase, into structures and occupied buildings from underlying conta

Vapor Intrusion Department of Toxic Substances Contro

VISL Vapor Intrusion Screening Level (U.S. EPA) VOA Volatile Organic Analysis VOCs Volatile Organic Compounds . x EXECUTIVE SUMMARY The intrusion of volatile chemicals from the subsurface into buildings is one of many exposure pathways that must be considered when assessing risk to human health from contamination. The Ohio EPA Division of Environmental Response and Revitalization (DERR. This fact sheet explains how vapor intrusion . occurs and what factors can cause vapors (sometimes called gases) to move into indoor air. Why is vapor intrusion important to me? When chemicals move indoors, you can be exposed to them by breathing indoor air. This exposure can . cause health effects, depending on the type and amount of chemical and the length of exposure. You can learn more. (Fact Sheets\LPD\Vapor Intrusion.indd 7/2019) Vapor Intrusion Into Indoor Air The Department of Environmental Quality (DEQ) voluntary programs evaluate various possible exposure pathways. One pathway is Vapor Intrusion into Indoor Air (VI). Volatile contaminants in soil or groundwater near a building have the potential to migrate upwards through soil and into indoor air. This pathway is.

Screening and Evaluating Vapor Intrusion Executive Summary Background Toxic vapors can move from contaminated groundwater and soil to indoor air. This process is called vapor intrusion. Vapors inside buildings can threaten human health. The science behind vapor intrusion has been evolving quickly. To protect the health of Californians, the Department of Toxic Substances Control (DTSC) and the. EPA. OSWER 9200.2-154 Jun 2015. Vapor Intrusion Handbook. Handbook. DoD. Jan 2009. Tri-service Environmental Risk Assessment Workgroup (TSERAWG) Vapor Intrustion Fact Sheets. Fact Sheet. DoD. Fact Sheet Series 1-11. Vapor Intrusion Mitigation in Existing Buildings Fact Sheet. Fact Sheet. NAVFAC. 1 May 2011 . Vapor Intrusion Mitigation in Construction of New Buildings Fact Sheet. Fact Sheet. This fact sheet provides a brief background on vapor intrusion and the health risks associated with exposure to PCE. 09/25/12 Vapor Intrusion Vapor intrusion refers to the migration of toxic vapors from contaminated soils and/or groundwater into overlying buildings; structures that may include, but not limited to, homes, schools, businesses, and day care and senior centers5, 6. Depending upon.

Fact Sheet: Evaluating Indoor Air Near VOC Contaminated Sites November 2008 What are VOCs? Volatile organic compounds (VOCs) are a class of chemicals that readily evaporate at room temperature. Gasoline, dry cleaning fluid, degreasing agents (solvents) and paint thinners are several examples of products that contain these compounds. VOCs may be found in soil and/or groundwater due to spillage. EPA will discuss the vapor intrusion work going on in Petoskey. For more information If you have questions or concerns about the PMC Groundwater site, contact: Heriberto León Community Involvement Coordinator 312-886-6163 leon.heriberto@epa.gov Owen Thompson Remedial Project Manager 312-886-4843 thompson.owen@epa.gov You may call EPA toll-free: 800-621-8431, weekdays, 9:30 a.m. to 5:30 p.m. Does EPA regulate naturally occurring radon? The U.S. Environmental Protection Agency (EPA) does not regulate naturally occurring radon in your home. However, the EPA, ATSDR, and other agencies have information about ways to reduce radon exposures and protect your health. What is chemical vapor intrusion? Chemical vapor intrusion is a way that . volatile chemical contaminants in soil and.

DoD Vapor Intrusion Handbook Fact Sheet Update No: 005

This fact sheet answers questions about a chemical called trichloroethene (TCE), which is widely used to remove grease from manufactured products. It provides information on health effects seen in humans exposed to TCE in air. It also provides information about the New York State Department of Health's guideline of 2 micrograms of TCE per cubic meter of air (2 mcg/m3) or 0.002 milligrams of. The U.S. EPA Region 9 released trichloroethylene (TCE) guidance on December 3, 2013 for expanded sample collection in the investigation of the Vapor Intrusion (VI) exposure pathway at specific National Priority List (NPL) sites in the San Francisco, CA South Bay

Vapor intrusion refers to the migration of toxic vapors from contaminated soils and/or groundwater into overlying buildings; structures that may include, but not limited to, homes, schools, businesses, and day care and senior centers5, 6. Depending upon the concentration of PCE present in the indoor air, exposure may result in the development of adverse human health conditions. PCE is a liquid. developed using established guidance from U.S. EPA, the Interstate Technology and Regulatory Council (ITRC) and other states, modified for the purposes of DWM. Special thanks to New Jersey Department of Environmental Protection (DEP) for permission to use the NJ DEP's October 2005 Vapor Intrusion Guidance as a template. In some instances, exact phrasing from the NJ DEP October 2005 Vapor. method to prevent vapor intrusion in affected buildings. A sub-slab depressurization system consists of PVC piping installed through the slab floor and a fan Former Raritan Arsenal Fact Sheet Edison, New Jersey June 201 Addressing vapor intrusion To address vapor intrusion within the former warehouse, EPA installed a sub slab depressurization (SSD) system. The SSD protects the workers in the office building by venting vapors outdoors using a series of fans and suction below the slab of the ground-level floor similar to a radon system Vapor intrusion is a way in which chemicals in soil or groundwater can get into indoor air (see figure at right). These chemicals may be released to the soil and groundwater from various sources including chemicals spilled on the ground at a factory or leaked from an underground storage tank. These chemicals can seep down into the soil and groundwater. Some chemicals also can travel through.

Vapor Intrusion California State Water Resources Control

(Subsurface Vapor Intrusion Guidance) Federal Register Notice - November 29, 2002 - Fact Sheet: Evaluating the Vapor Intrusion into Indoor Air Ł Adobe PDF File [17 KB] Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance) (Complete Document): Adobe PDF File. This fact sheet provides general information on vapor intrusion issues. It is intended to supplement other technical guidance documents prepared by the Maryland Department of the Environment (MDE). What Is Vapor Intrusion? Vapor intrusion is a way that chemicals in soil or groundwater can get into indoor air. Sometimes, chemicals are spilled on the ground at a factory, shopping center or gas. Wisconsin R vapor intrusion uic facts What is Vapor Intrusion? Chemicals used in commercial or industrial activities - dry cleaning chemicals, chemical degreasers and petroleum products such as gasoline - are sometimes spilled and leak into nearby soil or groundwater. When this happens, these chemicals may release gases or vapors, which travel from the contaminated groundwater or soil and.

Vapor Intrusion Guidance - Geosynte

US EPA. 2001. Fact Sheet: Correcting the Henry's Law Constant for Soil Temperature. US EPA. 2015. OSWER Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air. OSWER Publication 9200.2-154 On January 24, 2012, the U.S. Environmental Protection Agency (EPA) requested that MDCH provide public health input for a vapor intrusion investigation planned in Livonia (Wayne County), Michigan (Figure 1). Vapor intrusion occurs when vapors from groundwater o

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Vapor Intrusion Fact Sheet: plans for investigating vapor intrusion in Algona . Vapor intrusion occurs when gases from contaminated soil or groundwater enter buildings and affect indoor air quality. This fact sheet discusses how vapor intrusion will be investigated in the City of Algona, and includes general information regarding indoor air sampling. This effort is part of a larger. In April 2017, the U.S. EPA released a fact sheet explaining what vapor intrusion is, how it is determined if vapor intrusion is a concern, and the areas to be re-evaluated. Status. Vapor intrusion work is currently underway at the NIBW Superfund Site, lead by the U.S. EPA. For more information on vapor intrusion, please contact the U.S. EPA EPA NPL Fact Sheet, (Jan. 2018). This was the first site added to the NPL based solely on the risk presented by vapor intrusion, which is the migration of volatile organic compounds, like Trichloroethylene (TCE), from contaminated groundwater into subsurface soil and into overhead buildings. As background, this site had been used as a wheel cover manufacturing and chrome plating facility. Fact Sheet. What is Vapor Intrusion? As illustrated in Figure 1, vapor intrusion is a way that chemicals in soil or groundwater can get into indoor air. Sometimes, chemicals are spilled on the ground at a factory, shopping center or gas station or leak from an underground storage tank. These chemicals can seep into the soil and groundwater. Some chemicals can also travel through soil as vapors. Vapor Intrusion Update: EPA Issues New Findings on PCE. Posted on March 5, 2012. Posted in Environmental, Legislation, Policy. As reported here and here, MassDEP's Final Interim Vapor Intrusion Policy (pdf) is causing consternation among property owners who had thought that their state-managed cleanup sites had been given a clean bill of health, only to have those sites re-opened when. EPA will start work to evaluate the vapor intrusion risk in mid‐ April 2017 at SIBW and the SIBW subsite DCE Circuits in Tempe. At NIBW, EPA has already begun working in the Scottsdale area with the Participating Companies responsible for cleaningupthe contamination. Once the vapor intrusion investigation is completed, EPA wil

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