Specialty Seminar on Technical Updates to USEPA & ITRC Vapor Intrusion Guidance Data from Vapor Intrusion Investigations

Size: px
Start display at page:

Download "Specialty Seminar on Technical Updates to USEPA & ITRC Vapor Intrusion Guidance Data from Vapor Intrusion Investigations"

Transcription

1 Specialty Seminar on Technical Updates to USEPA & ITRC Vapor Intrusion Guidance Data from Vapor Intrusion Investigations The 18th Annual AEHS Meeting & West Coast Conference on Soils, Sediments, and Water March 13, 2008 Marriott Mission Valley, San Diego, California USEPA Office of Research and Development USEPA Office of Solid Waste and Emergency Response Interstate Technology Regulatory Council (ITRC) Contract Support: RTI International Office of Research and Development National Risk Management Research Laboratory March 17, 2008

2 Overview of USEPA s ORD Technical Outreach and Support Activities on Vapor Intrusion Impacts Authors: Doug Grosse, USEPA, ORD Robert Truesdale, RTI International Presented at: The 18th Annual AEHS Meeting & West Coast Conference on Soils, Sediments, and Water March 13, 2008 Marriott Mission Valley, San Diego, California Office of Research and Development National Risk Management Research Laboratory March 17, 2008

3 Acknowledgements: Henry Schuver, US EPA, OSW Helen Dawson, US EPA Region 8 Todd McAlary, Geosyntec Consultants Ian Hers, Golder Associates Paul Johnson, Arizona State University Dave Mickunas, USEPA, ERT William Wertz, New York State, DEC John Boyer, NJ, DEP Gina Plantz, Haley and Aldrich Krista Anders, NYS, DOH Dan Gallagher, CA, DTSC Justin Deming, NYS, DOH 2

4 ORD Technical Support Site Characterization and Data Acquisition Regional Technical Assistance OSWER Guidance Document Development Technology Transfer 3

5 This is the 7 th in a series of Workshops In addition to the roll-out of 2002 Draft Guidance in: Vapor Intrusion Seminars: San Francisco, Dallas, Atlanta, Vapor Intrusion Attenuation Modeling Vapor Attenuation Integrating Observed & Modeled Vapor Attenuation US EPA s Updated J&E Model Spreadsheet Field Demonstration of Soil Gas Sampling Methods, ORD Soil-gas Sample Collection and Analysis,

6 Indoor Air Vapor Intrusion Technology Transfer Activities Vapor Intrusion Seminars: San Francisco - December 3&4, 2002, Dallas - January 14&15, 2003, and Atlanta - 25&26, CDROM U.S.EPA Seminars on Indoor Air Vapor Intrusion EPA/625/C-03/004. Specialty Workshop on Vapor Intrusion Attenuation, AEHS 14th Annual West Coast Conference on Soils, Sediments and Water, San Diego - March 15-18, Modeling Vapor Attenuation Workshop The Annual International Conference on Soils, Sediments and Water, University of Massachusetts at Amherst - October 18-19, Specialty Workshop on Integrating Observed & Modeled Vapor Attenuation, AEHS 15th Annual West Coast Conference on Soils, Sediments and Water, San Diego, CA, March 14th, Specialty Workshop on: Development, Review and Use of US EPA s Updated J&E Model Spreadsheet, The 16th Annual West Coast Conference on Soils, Sediments and Water, March 21-22, 2006, San Diego, CA. Specialty Workshop and Field Demonstration of Soil Gas Sampling Methodology, 2006 Midwestern States Risk Assessment Symposium, Indianapolis, IN, August 21-24, Specialty Workshop on: Soil-gas Sample Collection and Analysis, The 17th Annual West Coast Conference on Soils, Sediments and Water, March 16, 2007, San Diego, CA. 5

7 VI Workshop Attendees by Category: All Workshops Other, 11% Regulated Industry, 11% EPA, 8% Consultants, 44% State & Local, 23% 6

8 Vapor Intrusion Workshops: Distribution of Attendees by Workshop 100% % 60% Other Regulated Industry EPA 40% State & Local Consultants 20% % 2004 Amherst San Diego San Diego San Diego San Diego 7

9 Main Topics Presented at the Technology Transfer Workshops: The EPA OSWER guidance document development and rollout (3 Seminar Series); Vapor intrusion attenuation factors; Observed and modeled vapor attenuation; Updates on and evolution of the USEPA s interpretation of the J&E Model and spreadsheets; and Soil gas sampling, collection, analysis and interpretation 8

10 Specialty Workshop on Vapor Intrusion Attenuation, AEHS 14th Annual San Diego - March 15-18, (1) What can be learned from measurements of vapor attenuation processes in the subsurface? (2) How this knowledge can be applied to improve the default vapor attenuation factors in the draft EPA, OSWER Vapor Intrusion Guidance. (3) To gather empirically measured attenuation factors for comparison with these generic attenuation factors and to study the relationships between site and building conditions and vapor intrusion attenuation. 9

11 10 Conclusions Radon can be useful as a tracer in VI investigations. Consistent alphas should be expected across chemicals for VOC intrusion into a building. Ratios of the contaminants or concern to checmicals less likely to have background indoor air sources (i.e., 1,1-DCE or TCE) may be useful for evaluating background influences. Sub-slab sampling very useful for evaluating background influences. Soil gas probes should be installed and sampled with the same care as groundwater monitoring wells. Seasonal variation in indoor air can be as high as a factor or 3 to achieve annual average concentrations, the best time to sample is spring or fall.

12 Modeling Vapor Attenuation Workshop The Annual International Conference on Soils, Sediments and Water, University of Massachusetts at Amherst - October 18-19, Comparison of Measured Data to the EPA Guidance Figure 3 Attenuation Factors Improvements to Semi-Site Specific Attenuation Factors The Role of Modeling in the Guidance Approaches and Methods for Measuring Vapor Intrusion 11

13 Conclusions and Recommendations The current generic and semi-site-specific attenuation factors provide protective estimates of vapor intrusion at most sites. The semi-site-specific attenuation factors are also very protective, but need to be expanded to commercial settings (in addition to residential settings). An expanded role for modeling in vapor intrusion decision making may be appropriate for the revised Guidance. 12

14 Specialty Workshop on Integrating Observed & Modeled Vapor Attenuation, AEHS 15th Annual West Coast Conference, San Diego, CA, March 14th, Using observational data sets Making measurements in soil gas and indoor air Applying scenario-specific modeling techniques to integrate these two data sources in improving the validity and usefulness of the Guidance. 13

15 Conclusions EPA Guidance improvements suggested at the 2005 San Diego workshop include: Simplifying and clarifying the guidance structure and framework Strengthening the site-specific screening step (Question 5) to allow more site-specific determinations of attenuation factors for soil gas and groundwater measurements taken close to a building Revising EPA s spreadsheet version of the J&E model to support the expanded site-specific screening, including changes to constrain inputs to prevent unreasonable results Formulating and implementing criteria and procedures for filtering and analyzing empirical data to improve the generic attenuation factors in the Guidance; and Assembling the latest data collection strategies for VI site investigations to include in the updated guidance, including tools for discriminating indoor air background sources from vapor intrusion. 14

16 Specialty Workshop on: Development, Review and Use of US EPA s Updated J&E Model Spreadsheet, The 16th Annual West Coast Conference, March 21-22, 2006, San Diego, CA. Peer Review of the Spreadsheet Implementation of the J&E Model Model Simulations EPA s Vapor Intrusion Database Soil Gas Sampling Results 15

17 Specialty Workshop and Field Demonstration of Soil Gas Sampling Methodology, 2006 Midwestern States Risk Assessment Symposium, Indianapolis, IN, August 21-24, 2006 Demonstrate state-of-the-art soil gas sampling methods, sharing knowledge among leading practitioners (the volunteers) and approximately 100 students Improve understanding of soil gas sampling and how sitespecific and methodological factors impact results Directly compare methods at the same site at the same time Identify and document strengths and weaknesses of methods to improve regulatory guidance 16

18 Passive Soil Gas Sampling Shallow passive probes provided and excellent initial line of evidence for delineating the subsurface VOC impact at the Ertel site Analysis of compounds desorbed from the probes provided a rich dataset of CHCs, PHCs, and PAHs released during past site activities that was used to focus subsequent sampling events Sample mass estimates showed strong correlation with the active data, but the algorithms to convert mass to concentration tended to underpredict the concentrations measured using the active probe. Additional work is needed on adapting the conversion algorithm to site specific conditions. 17

19 Active Soil Gas Sampling Good correlation between laboratory TO-17 and TAGA whole air methods. Very good comparability between a portable, handheld field screening PID (Foxboro TVA 1000) to data measured with an the onsite TAGA for values exceeding 4 ppmv. Good correlation between mobile laboratory 8021 and TAGA TCE measurements. 18

20 Specialty Workshop on: Soil-gas Sample Collection and Analysis, The 17th Annual West Coast Conference, March 16, 2007, San Diego, CA. Probe Installation and Sample Collection: probe installation method, tubing type, Tedlar bags, adsorptive media (active and passive), and tracer/leak detection methods. Air Extraction Issues: equilibration time, purge and sample volume, sample flow rate, air permeability testing. Analytical Methods: available analytical methods (selection and use), field analytical methods. 19

21 All presentations provided in these featured VI workshops can be found at: 20

March 18, Webinar access to this workshop is sponsored by U.S. EPA

March 18, Webinar access to this workshop is sponsored by U.S. EPA Workshop: Vapor Intrusion (VI) Exposures The Challenges of, Need for, and Benefits of Long Term Stewardship The 24th Annual AEHS International West Coast Conference on Soils, Water, Energy and Air March

More information

Use of Soil-Gas Data in Vapor Intrusion Decisions

Use of Soil-Gas Data in Vapor Intrusion Decisions Use of Soil-Gas Data in Vapor Intrusion Decisions 17 th AEHS West Coast Conference on Soils, Sediments, and Water San Diego, CA March 21-22, 2007 Presented by: Henry Schuver, US EPA OSW See: http://iavi.rti.org

More information

A Review for the US Navy of Best Practices, Knowledge and Data Gaps, and Research Directions for Vapor Intrusion

A Review for the US Navy of Best Practices, Knowledge and Data Gaps, and Research Directions for Vapor Intrusion A Review for the US Navy of Best Practices, Knowledge and Data Gaps, and Research Directions for Vapor Intrusion Todd McAlary and Robert Ettinger, Geosyntec Consultants Paul Johnson, Arizona State University

More information

Understanding VI Screening Levels

Understanding VI Screening Levels A&WMA Specialty Conference URS Understanding VI Screening Levels Sept 29, 2010 VI Conference 1 Screening Values URS EPA and various states use screening values to decide which sites merit further investigation

More information

EPA s Vapor Intrusion Database

EPA s Vapor Intrusion Database EPA s Vapor Intrusion Database Characterization and Evaluation of Attenuation Factors for Chlorinated VOCs in Residences Helen Dawson, PhD Rich Kapuscinski, PhD March 20, 2012 1 Acknowledgements OSWER

More information

Presenter Bios. Finding Practical Solutions for the Chlorinated Vapor Intrusion Pathway: Helping RCRA Facilities Meet Significant Challenges

Presenter Bios. Finding Practical Solutions for the Chlorinated Vapor Intrusion Pathway: Helping RCRA Facilities Meet Significant Challenges Finding Practical Solutions for the Chlorinated Vapor Intrusion Pathway: Helping RCRA Facilities Meet Significant Challenges The 27th Annual AEHS International Conference on Soil, Water, Energy, and Air

More information

Lessons from Large Groundwater Plume Sites Redfield and Wall

Lessons from Large Groundwater Plume Sites Redfield and Wall Lessons from Large Groundwater Plume Sites Redfield and Wall Vapor Intrusion Workshop 18th Annual West Coast Conference on Soils, Sediments and Water, San Diego, California, March 13, 2008 Ian Hers, Golder

More information

H&P Breakfast Seminar

H&P Breakfast Seminar Vapor Intrusion Risk Pathway: Regulatory Updates H&P Breakfast Seminar September 25, 2012 Blayne Hartman 858-204-6170 blayne@hartmaneg.com EPA Guidance Updates (Final Out in Nov 2012) EPA (OSWER & Superfund)

More information

ESTCP Research on Optimization of Vapor Intrusion Mitigation Systems in Large Military Buildings

ESTCP Research on Optimization of Vapor Intrusion Mitigation Systems in Large Military Buildings ESTCP Research on Optimization of Vapor Intrusion Mitigation Systems in Large Military Buildings Todd McAlary, Ph.D., P.Eng., P.G., CUT Principal and Practice Leader Vapor Intrusion Services Geosyntec

More information

Vapor Intrusion - Site Characterization and Screening. NEWMOA Workshop on Vapor Intrusion Chelmsford, MA April 12, 2006

Vapor Intrusion - Site Characterization and Screening. NEWMOA Workshop on Vapor Intrusion Chelmsford, MA April 12, 2006 Vapor Intrusion - Site Characterization and Screening NEWMOA Workshop on Vapor Intrusion Chelmsford, MA April 12, 2006 David J. Folkes P.E. 1 What is Vapor Intrusion?! Compounds of Concern " Volatile Organics

More information

Vapor Intrusion Pathway Screening for Soil Excavation Remedies

Vapor Intrusion Pathway Screening for Soil Excavation Remedies Vapor Intrusion Pathway Screening for Soil Excavation Remedies Helen Dawson, Ph.D. Geosyntec Consultants Chris Lutes, CH2MHill Dan Carr, Sanborn Head & Associates Todd McAlary, Geosyntec Consultants Robert

More information

1.0 EPA/AEHS Vapor Intrusion Attenuation Workshop

1.0 EPA/AEHS Vapor Intrusion Attenuation Workshop May 17, 2004 To: From: Subject: Karen Tomimatsu and Henry Schuver, EPA/OSW Robert Truesdale, RTI Final report describing VI attentuation workshop, database, analysis of attenuation factors, precluding

More information

Building Pressure Cycling for Vapor Intrusion Assessment

Building Pressure Cycling for Vapor Intrusion Assessment Building Pressure Cycling for Vapor Intrusion Assessment PRESENTED BY: Helen Dawson, Ph.D. William Wertz, Ph.D., Todd McAlary, Ph.D., Geosyntec Consultants, Inc., Dan Carr, P.E., P.G., Sanborn Head & Associates,

More information

Mass Flux Characterization for Vapor Intrusion Assessment

Mass Flux Characterization for Vapor Intrusion Assessment Mass Flux Characterization for Vapor Intrusion Assessment ESTCP ER 201503 Helen Dawson, Ph.D. Geosyntec Consultants, Inc. April 13, 2016 Project Team Organization Individual Responsibility/Specialization

More information

Ensuring Data Integrity

Ensuring Data Integrity Ensuring Data Integrity Gina Plantz Severn Trent Laboratories, Inc. gplantz@stl-inc.com NEWMOA Vapor Intrusion Seminar Chelmsford, MA April 12 th, 2006 Focus Areas Measurement of VOCs & non-vocs Soil Gas,

More information

Vapor Intrusion Attenuation Factors Based On Long Term Monitoring Data

Vapor Intrusion Attenuation Factors Based On Long Term Monitoring Data Proceedings of the Annual International Conference on Soils, Sediments, Water and Energy Volume 12 Article 38 January 2010 Vapor Intrusion Attenuation Factors Based On Long Term Monitoring Data D.J. Folkes

More information

Updated Approaches for Monitoring Strategies/Options for Long Term Protection from CVI (under RCRA Corrective Action)

Updated Approaches for Monitoring Strategies/Options for Long Term Protection from CVI (under RCRA Corrective Action) USEPA Work Shop, AEHS 27 th Annual International Conference on Soil, Water, Energy and Air March 21, 2017, San Diego, CA Updated Approaches for Monitoring Strategies/Options for Long Term Protection from

More information

Proposed Changes to EPA s Spreadsheet Version of Johnson & Ettinger Model (and some new spreadsheet tools)

Proposed Changes to EPA s Spreadsheet Version of Johnson & Ettinger Model (and some new spreadsheet tools) Proposed Changes to EPA s Spreadsheet Version of Johnson & Ettinger Model (and some new spreadsheet tools) Workshop Integrating Observed & Modeled Vapor Attenuation The 15th Annual AEHS West Coast Conference,

More information

Vapor Intrusion Guidance and Policy Activities at U.S. EPA

Vapor Intrusion Guidance and Policy Activities at U.S. EPA Vapor Intrusion Guidance and Policy Activities at U.S. EPA Stiven Foster, Helen Dawson, Henry Schuver Photo image area measures 2 H x 6.93 W and can be masked by a collage strip of one, two or three images.

More information

Consideration of Vapor Intrusion Pathway Modeling in the MassDEP Draft Vapor Intrusion Guidance

Consideration of Vapor Intrusion Pathway Modeling in the MassDEP Draft Vapor Intrusion Guidance 289 Great Road, Suite 105 Acton, Massachusetts 01720 PH 978.263.9588 FAX 978.263.9594 www.geosyntec.com Mr. Andrew Friedmann, Ph.D. sent via email Massachusetts Department of Environmental Protection Northeast

More information

What is the Evidence for Long Term Stewardship (LTS)

What is the Evidence for Long Term Stewardship (LTS) What is the Evidence for Long Term Stewardship (LTS) (vs. Stopping All Monitoring (SAM)) for the Vapor Intrusion Pathway?* For EnviroForensics & Barnes and Thornburg Webinar Nov. 19, 2014 by Henry J. Schuver,

More information

Is this the maturation Phase of Vapor Intrusion Investigations?

Is this the maturation Phase of Vapor Intrusion Investigations? Is this the maturation Phase of Vapor Intrusion Investigations? Presenter: Will Elcoate June 27 th, 2012 EPA Moves forward with Vapor Intrusion EPA plans to tear down three city businesses Columbus Telegram

More information

The Future of Vapor Intrusion (VI)

The Future of Vapor Intrusion (VI) The Future of Vapor Intrusion (VI) Monitoring and Analysis National Environmental Measurement Conference Bellevue, WA Aug. 15, 2011 Presented by: Henry Schuver, DrPH USEPA Office of Resource Conservation

More information

Vapor Intrusion: The Environmental Box-Office Blockbuster. June Blayne Hartman H&P Mobile Geochemistry Carlsbad, CA

Vapor Intrusion: The Environmental Box-Office Blockbuster. June Blayne Hartman H&P Mobile Geochemistry Carlsbad, CA Vapor Intrusion: The Environmental Box-Office Blockbuster June 2007 Blayne Hartman H&P Mobile Geochemistry Carlsbad, CA 760-804-9678 www.handpmg.com This presentation is an excerpt from the vapor intrusion

More information

Case Studies of Innovative Use of Tracers, Indicators and Field GC/MS for Assessing the Vapor Intrusion Pathway

Case Studies of Innovative Use of Tracers, Indicators and Field GC/MS for Assessing the Vapor Intrusion Pathway AEHS Westcoast Conference Work Shop, March 22, 2017 San Diego, CA Case Studies of Innovative Use of Tracers, Indicators and Field GC/MS for Assessing the Vapor Intrusion Pathway Stack effect & temperature

More information

Empirical Data: Challenges and Future Directions

Empirical Data: Challenges and Future Directions Empirical Data: Challenges and Future Directions by Todd McAlary, Consultants, Inc. AEHS VI Workshop March 16, 2004 Challenges Temporal Variability Spatial Variability Sampling Variability Media which

More information

Use of Crawl Space Sampling Data and Other Lines of Evidence for Evaluating Vapor Intrusion

Use of Crawl Space Sampling Data and Other Lines of Evidence for Evaluating Vapor Intrusion CALIFORNIA ENVIRONMENTAL PROTECTION AGENCY DEPARTMENT OF TOXIC SUBSTANCES CONTROL Use of Crawl Space Sampling Data and Other Lines of Evidence for Evaluating Vapor Intrusion C.Y. Jeng and William Bosan

More information

23 rd National Tanks Conference Petroleum Vapor Intrusion Session March 19, 2012 Matthew D. Young Cumberland Farms Inc.

23 rd National Tanks Conference Petroleum Vapor Intrusion Session March 19, 2012 Matthew D. Young Cumberland Farms Inc. 23 rd National Tanks Conference Petroleum Vapor Intrusion Session March 19, 2012 Matthew D. Young Cumberland Farms Inc. Gulf Oil LP Table of Contents Purpose & Scope (2 minutes) The Tale of the Tape (3

More information

A Rational Approach to Vapor Intrusion Preferential Pathways

A Rational Approach to Vapor Intrusion Preferential Pathways A Rational Approach to Vapor Intrusion Preferential Pathways PRESENTED BY: David J. Folkes, PE Geosyntec Consultants, Inc. AEHS West Coast Conference EPA Vapor Intrusion Technical Workshop March 22, 2016

More information

Vapor Intrusion Update: Separating the Environmental exposure from Indoor Air Quality Issues Guidance

Vapor Intrusion Update: Separating the Environmental exposure from Indoor Air Quality Issues Guidance Vapor Intrusion Update: Separating the Environmental exposure from Indoor Air Quality Issues Guidance Will Elcoate Alpha Analytical December 5 th. 2014 1 Vapor Intrusion is the migration of volatile chemicals

More information

Soil Gas Analytical Methods (Overview, TAGA, Forensics)

Soil Gas Analytical Methods (Overview, TAGA, Forensics) Soil Gas Analytical Methods (Overview, TAGA, Forensics) Ertel Facility Dr. Blayne Hartman, H&P Mobile Geochemistry David Mikunas, EPA-TAGA Ms. Gina Plantz, Newfields This presentation gives a very brief

More information

NEWMOA/ Brown SRP Vapor Intrusion Workshop. September 26 and 26, η T. q = k ρ g. D ig. = d i air η g. dφ = gz + 10 / 3

NEWMOA/ Brown SRP Vapor Intrusion Workshop. September 26 and 26, η T. q = k ρ g. D ig. = d i air η g. dφ = gz + 10 / 3 Overview of Vapor Intrusion and Characterization of Exposure Risks Presented by Kelly G. Pennell, PhD, PE Assistant Professor Civil Engineering - University of Kentucky J T = q C Dig C D ig = d i air η

More information

Vapor Intrusion Risk Pathway: Updates & Hot topics

Vapor Intrusion Risk Pathway: Updates & Hot topics Vapor Intrusion Risk Pathway: Updates & Hot topics Aug 2006 Blayne Hartman H&P Mobile Geochemistry Carlsbad, CA 760-804-9678 www.handpmg.com This presentation is an excerpt of the vapor intrusion training

More information

U.S. EPA s Vapor Intrusion Database: Preliminary Evaluation of Attenuation Factors

U.S. EPA s Vapor Intrusion Database: Preliminary Evaluation of Attenuation Factors March 4, 2008 U.S. EPA s Vapor Intrusion Database: Preliminary Evaluation of Attenuation Factors Office of Solid Waste U.S. Environmental Protection Agency Washington, DC 20460 [This page intentionally

More information

Eric M. Nichols, PE Amy Goldberg Day

Eric M. Nichols, PE Amy Goldberg Day Case Study of Subsurface Vapor Intrusion at a Dry Cleaner Site Amy Goldberg Day Amy.Goldberg.Day@lfr.com Eric M. Nichols, PE Eric.Nichols@lfr.com AEHS 14th Annual West Coast Conference on Soils, Sediments

More information

The Vapor-Intrusion Pathway: Petroleum Hydrocarbon Issues

The Vapor-Intrusion Pathway: Petroleum Hydrocarbon Issues The Vapor-Intrusion Pathway: Petroleum Hydrocarbon Issues by Blayne Hartman It has been four years since my last article in LUSTline on vapor intrusion (LL#53, September 2006). Since then, the vaporintrusion

More information

Practical Aspects of VI Assessment for TCE. Acknowledgments and special thanks to:

Practical Aspects of VI Assessment for TCE. Acknowledgments and special thanks to: Practical Aspects of VI Assessment for TCE Presented by: David Shea, P.E. Sanborn, Head & Associates, Inc. Concord, NH Building Trust. Engineering Success. Acknowledgments and special thanks to: Helen

More information

Ask The Expert Webinar Series Vapor Intrusion Assessments Part Two: Improving Data Quality Using Today s Best Practices for Sample Analysis

Ask The Expert Webinar Series Vapor Intrusion Assessments Part Two: Improving Data Quality Using Today s Best Practices for Sample Analysis Ask The Expert Webinar Series Vapor Intrusion Assessments Part Two: Improving Data Quality Using Today s Best Practices for Sample Analysis Taryn McKnight Client Relations Manager The migration of volatile

More information

TCE Fate and Transport, as Related to Vapor Intrusion

TCE Fate and Transport, as Related to Vapor Intrusion TCE Fate and Transport, as Related to Vapor Intrusion Eric Suuberg School of Engineering, Brown University Providence, Rhode Island NEWMOA/Brown SRP Workshop on TCE Vapor Intrusion: State of the Science,

More information

23 February 2017 Reference No L-Rev1-8500

23 February 2017 Reference No L-Rev1-8500 23 February 2017 Reference No. David Williams Contaminated Sites Approved Professional Society (CSAP) 744 W. Hastings Street Vancouver, BC V6C 1A5 UPDATED REVIEW OF LATERAL VAPOUR ATTENUATION FACTORS FOR

More information

TCE Fate and Transport, as Related to Vapor Intrusion

TCE Fate and Transport, as Related to Vapor Intrusion TCE Fate and Transport, as Related to Vapor Intrusion Eric Suuberg School of Engineering, Brown University Providence, Rhode Island NEWMOA/Brown SRP Workshop on TCE Vapor Intrusion: State of the Science,

More information

Post-Remedy Vapor Intrusion Evaluation for the Laboratory for Energy-Related Health Research (LEHR) Superfund Site

Post-Remedy Vapor Intrusion Evaluation for the Laboratory for Energy-Related Health Research (LEHR) Superfund Site August 20 23, 2018 Grand Junction, Colorado 2018 Long-Term Stewardship Conference Post-Remedy Vapor Intrusion Evaluation for the Laboratory for Energy-Related Health Research (LEHR) Superfund Site Mary

More information

Vapor Intrusion (VI):

Vapor Intrusion (VI): Vapor Intrusion (VI): EPA s Experiences with Analogous Gases USEPA Workshop: Addressing Regulatory Challenges AEHS West Coast Conference San Diego, CA Mar. 15, 2011 Presented by: Henry Schuver, DrPH USEPA

More information

EPA Vapor Intrusion (VI) Stakeholder-Involvement Forum. March 19, 2012 AEHS West Coast Conference San Diego, Calf. w/ Full Web Access

EPA Vapor Intrusion (VI) Stakeholder-Involvement Forum. March 19, 2012 AEHS West Coast Conference San Diego, Calf. w/ Full Web Access EPA Vapor Intrusion (VI) Stakeholder-Involvement Forum March 19, 2012 AEHS West Coast Conference San Diego, Calf. w/ Full Web Access VI Guidance is a Pilot for EPA s Community Engagement Initiative Objective

More information

Quantitative Passive Diffusive Sampling for Assessing Soil Vapor Intrusion to Indoor Air

Quantitative Passive Diffusive Sampling for Assessing Soil Vapor Intrusion to Indoor Air Quantitative Passive Diffusive Sampling for Assessing Soil Vapor Intrusion to Indoor Air Todd McAlary and Hester Groenevelt, Geosyntec Consultants, Inc., T. Gorecki and Suresh Seethapathy, University of

More information

NJDEP VAPOR INTRUSION GUIDANCE Ground Water Screening Levels: Default Values and Site-Specific Specific Evaluation

NJDEP VAPOR INTRUSION GUIDANCE Ground Water Screening Levels: Default Values and Site-Specific Specific Evaluation NJDEP VAPOR INTRUSION GUIDANCE Ground Water Screening Levels: Default Values and Site-Specific Specific Evaluation Paul Sanders New Jersey Department of Environmental Protection paul.sanders@dep.state.nj.us

More information

The IAQ/Mold Assessment Getting it Right! Controlling Your Risk

The IAQ/Mold Assessment Getting it Right! Controlling Your Risk EBC Seminar The IAQ/Mold Assessment Getting it Right! Controlling Your Risk Next Speaker Rosemary McCafferty Haley & Aldrich, Inc. Outline Vapor Intrusion Overview Vapor Intrusion Sampling Vapor Intrusion

More information

Evaluation of Spatial and Temporal Variability in VOC Concentrations at Vapor Intrusion Investigation Sites.

Evaluation of Spatial and Temporal Variability in VOC Concentrations at Vapor Intrusion Investigation Sites. Evaluation of Spatial and Temporal Variability in VOC Concentrations at Vapor Intrusion Investigation Sites. Proceeding of Air & Waste Management Association s Vapor Intrusion: Learning from the Challenges,

More information

PVI Risk Pathway: Sampling Considerations

PVI Risk Pathway: Sampling Considerations PVI Risk Pathway: Sampling Considerations AEHS PVI Workshop March 2015 Blayne Hartman Ph.D. 858-204-6170 www.hartmaneg.com PVI VI Pathway Made Simple Start Exclusion Criteria Exist? yes no Collect Clean

More information

Sustainability; in Residential, Commercial and Industrial Buildings

Sustainability; in Residential, Commercial and Industrial Buildings 420 Not Heated 422 Heated ORD VI-Research Duplex and Wheeler Building, Indianapolis- Summary of Evidence to Date: Temporal Variability in Long-term Mitigation Performance and Before Mitigation: What Causes

More information

Temperature and Vapor Intrusion Evaluation

Temperature and Vapor Intrusion Evaluation Temperature and Vapor Intrusion Evaluation Evelina Morales, Ph.D. Oklahoma DEQ, Land Protection Division 405 702-5108 Evelina.morales@deq.state.ok.us Presented at: 18 th Annual AEHS Meeting and West Coast

More information

Risk Management Strategies to Address Vapor Intrusion Assessment and Mitigation Uncertainties Robert Ettinger Geosyntec Consultants

Risk Management Strategies to Address Vapor Intrusion Assessment and Mitigation Uncertainties Robert Ettinger Geosyntec Consultants Risk Management Strategies to Address Vapor Intrusion Assessment and Mitigation Uncertainties Robert Ettinger Geosyntec Consultants 25 th Groundwater Resources Association Annual Meeting 2016: Groundwater

More information

NJDEP Vapor Intrusion Guidance

NJDEP Vapor Intrusion Guidance NEW JERSEY VAPOR INTRUSION GUIDANCE Kenneth J. Kloo, Brownfield Administrator ASTSWMO 2008 Mid-Year Meeting Mobile, Alabama April 23 & 24, 2008 NJDEP Vapor Intrusion Guidance VAPOR INTRUSION GUIDANCE NEW

More information

Since I wrote Parts 1 and 2 in July 2002 and October 2003 (LUSTLines #42 and #44), vapor intrusion has continued to be a

Since I wrote Parts 1 and 2 in July 2002 and October 2003 (LUSTLines #42 and #44), vapor intrusion has continued to be a LUSTLine Bulletin 48 November 2004 How to Collect Reliable Soil-Gas Data for Risk-Based Applications Specifically Vapor Intrusion Part 3 Answers to Frequently Asked Questions by Blayne Hartman Since I

More information

Examples of Data Collection Strategies and Methods

Examples of Data Collection Strategies and Methods Examples of Data Collection Strategies and Methods by Todd McAlary, Consultants, Inc. AEHS VI Workshop March 14, 2005 Outline External vs Internal Data Collection Typical Scenarios Strategies for Data

More information

Case Study of Modeled and Observed TCE Attenuation from Groundwater to Indoor Air. Christopher G. Lawless Johnson Wright, Inc.

Case Study of Modeled and Observed TCE Attenuation from Groundwater to Indoor Air. Christopher G. Lawless Johnson Wright, Inc. Case Study of Modeled and Observed TCE Attenuation from Groundwater to Indoor Air Christopher G. Lawless Johnson Wright, Inc. October 18, 2004 Presentation Contents SITE BACKGROUND STUDY METHODS RESULTS

More information

A Comparison of BioVapor and Johnson and Ettinger Model Predictions to Field Data for Multiple Sites

A Comparison of BioVapor and Johnson and Ettinger Model Predictions to Field Data for Multiple Sites Compare to J&E? O 2 for Mitigation? A Comparison of BioVapor and Johnson and Ettinger Model Predictions to Field Data for Multiple Sites AEHS 25th Annual International Conference on Soil, Water, Energy

More information

Part 3 Fundamentals. Most Common VI Bloopers. Handy Unit Conversions:

Part 3 Fundamentals. Most Common VI Bloopers. Handy Unit Conversions: Part 3 Fundamentals Units Contaminant Partitioning Vapor Migration Bioattenuation Site Conceptual Model Attenuation (alpha) Factors Risk/Screening Levels Most Common VI Bloopers Unit Confusion Assuming

More information

Soil Vapor Installation

Soil Vapor Installation Soil Vapor Installation and Sampling Procedures In general accordance with 2012 DTSC Active Soil Gas Investigations Advisory H&P Mobile Geochemistry, Inc. Irvine Marriott Sept 25, 2012 To Be Discussed

More information

Detailed discussion of the Petroleum Vapor Database is provided in Davis R.V., 2009, LUSTLine #61 and EPA Jan

Detailed discussion of the Petroleum Vapor Database is provided in Davis R.V., 2009, LUSTLine #61 and EPA Jan 1 The objective of studying and evaluating the behavior of subsurface petroleum vapors is to understand why, with so many LUST sites worldwide, the PVI pathway is rarely complete. Advancing our knowledge

More information

Updated J&E Model VIAModel.xls

Updated J&E Model VIAModel.xls Updated J&E Model VIAModel.xls Helen Dawson, Ph.D. USEPA Region 8 AEHS Spring 2006 What s Different? Combines screening and advanced versions of the groundwater and soil gas spreadsheets. Provides default

More information

VAPOR ENCROACHMENT VAPOR INTRUSION; TRANSACTIONAL ASSESSMENT OF THE POSSIBLE VAPOR INTRUSION PATHWAY

VAPOR ENCROACHMENT VAPOR INTRUSION; TRANSACTIONAL ASSESSMENT OF THE POSSIBLE VAPOR INTRUSION PATHWAY VAPOR ENCROACHMENT VAPOR INTRUSION; TRANSACTIONAL ASSESSMENT OF THE POSSIBLE VAPOR INTRUSION PATHWAY By Russell Griebel, P.G., C.P.G. United Consulting Presentation Talking Points How We Got Here Vapor

More information

Lessons from Petroleum Hydrocarbon and Chlorinated Solvent Sites Extensively Monitored for Vapor Intrusion

Lessons from Petroleum Hydrocarbon and Chlorinated Solvent Sites Extensively Monitored for Vapor Intrusion Lessons from Petroleum Hydrocarbon and Chlorinated Solvent Sites Extensively Monitored for Vapor Intrusion By Todd McAlary Geosyntec Consultants, Inc. EPA Workshop on Vapor Intrusion San Diego, CA March

More information

Page. Changes in VI Behavior with Time: In-Progress Results from a Multi-Year Study. Vapor Intrusion (VI) Overview

Page. Changes in VI Behavior with Time: In-Progress Results from a Multi-Year Study. Vapor Intrusion (VI) Overview University of Washington Superfund Research Program Changes in VI Behavior with Time: In-Progress Results from a Multi-Year Study Agency Seminar Series at EPA Region "Temporal Changes in Vapor Intrusion

More information

Armen Cleaners Indoor Air Quality Investigation. Jon Gulch, OSC U.S. EPA, Region V, ERB

Armen Cleaners Indoor Air Quality Investigation. Jon Gulch, OSC U.S. EPA, Region V, ERB Armen Cleaners Indoor Air Quality Investigation Jon Gulch, OSC U.S. EPA, Region V, ERB Purpose of Investigation Assist MDCH in Evaluating Indoor Air Quality of Residences for the Presence of VOCs Associated

More information

Sniffing Out Vapor Intrusion

Sniffing Out Vapor Intrusion Portfolio Media. Inc. 860 Broadway, 6th Floor New York, NY 10003 www.law360.com Phone: +1 646 783 7100 Fax: +1 646 783 7161 customerservice@law360.com Sniffing Out Vapor Intrusion Robert Howard Latham

More information

Vapor Intrusion Assessment. Kaitlyn S. Rhonehouse, P.E. Florida Brownfield Association 16 th Annual Conference, Brownfields in Motion

Vapor Intrusion Assessment. Kaitlyn S. Rhonehouse, P.E. Florida Brownfield Association 16 th Annual Conference, Brownfields in Motion Vapor Intrusion Assessment Kaitlyn S. Rhonehouse, P.E. Florida Brownfield Association 16 th Annual Conference, Brownfields in Motion VI Assessment what to consider? Potential for VI Phase I ESA ASTM E1527

More information

Passive Sampling Demonstration/Validation for Vapor Intrusion Assessments

Passive Sampling Demonstration/Validation for Vapor Intrusion Assessments Passive Sampling Demonstration/Validation for Vapor Intrusion Assessments Todd McAlary and H. Groenevelt, Geosyntec Consultants, Inc., T. Gorecki and S. Seethapathy, University of Waterloo, D. Crump, Cranfield

More information

Vapor Intrusion Regulatory Guidance and IRIS Updates with Mitigation Case Studies. Richard J. Rago Haley & Aldrich 20 June 2012

Vapor Intrusion Regulatory Guidance and IRIS Updates with Mitigation Case Studies. Richard J. Rago Haley & Aldrich 20 June 2012 Vapor Intrusion Regulatory Guidance and IRIS Updates with Mitigation Case Studies Richard J. Rago Haley & Aldrich 20 June 2012 Outline Vapor Intrusion Overview and VI Regulatory Landscape Recent Changes

More information

PRACTICAL ASPECTS OFCONDUCTING SOIL VAPOR INVESTIGATIONS in general accordance with the 2015 DTSC Advisory

PRACTICAL ASPECTS OFCONDUCTING SOIL VAPOR INVESTIGATIONS in general accordance with the 2015 DTSC Advisory PRACTICAL ASPECTS OFCONDUCTING SOIL VAPOR INVESTIGATIONS in general accordance with the 2015 DTSC Advisory CA CUPA 2017, San Diego, February 2017 Suzie Nawikas, H&P Mobile Geochemistry, Inc Dave Balkenbush,

More information

Implementation of a Strategic Approach for Complex Vapor Intrusion Assessment at a Large Military Facility

Implementation of a Strategic Approach for Complex Vapor Intrusion Assessment at a Large Military Facility Implementation of a Strategic Approach for Complex Vapor Intrusion Assessment at a Large Military Facility David W. Himmelheber Emily H. Majcher, Paul Nicholson, Aron Krasnopoler, Todd McAlary, Robert

More information

Evaluation of VI Data Relative to Separation Distance Screening Criteria A Michigan Case Study

Evaluation of VI Data Relative to Separation Distance Screening Criteria A Michigan Case Study GROUNDWATER & ENVIRONMENTAL SERVICES,INC. Evaluation of VI Data Relative to Separation Distance Screening Criteria A Michigan Case Study Chris Mulry, GES, Inc. March 19, 2014 Presentation Outline Study

More information

Since I wrote Part 3 of this Collecting Reliable Soil-Gas Data series in LUSTLine #48, Nov 2004, the subject of vapor intrusion

Since I wrote Part 3 of this Collecting Reliable Soil-Gas Data series in LUSTLine #48, Nov 2004, the subject of vapor intrusion LUSTLine Bulletin 53 September 2006 How to Collect Reliable Soil-Gas Data for Risk-Based Applications Specifically Vapor Intrusion Part 4 Updates on Soil-Gas Collection and Analytical Procedures by Blayne

More information

Vapor Intrusion in Massachusetts Gerard Martin

Vapor Intrusion in Massachusetts Gerard Martin Vapor Intrusion in Massachusetts Gerard Martin Chief Compliance, Enforcement and Brownfields Redevelopment Section Bureau of Waste Site Cleanup, MassDEP Proposed MCP Amendments Relative to Vapor Intrusion

More information

MPCA Site Assessment: Vapor Intrusion Investigation. Remediation Division Superfund Unit 1

MPCA Site Assessment: Vapor Intrusion Investigation. Remediation Division Superfund Unit 1 MPCA Site Assessment: Vapor Intrusion Investigation Remediation Division Superfund Unit 1 MPCA Project Team Doug Wetzstein, Supervisor Dave Moore, Project Leader Dave Scheer, Hydrogeologist Hydrogeologist

More information

Soil Gas Sampling for Vapor Intrusion Assessments: Key Issues

Soil Gas Sampling for Vapor Intrusion Assessments: Key Issues Soil Gas Sampling for Vapor Intrusion Assessments: Key Issues Dr. Blayne Hartman H&P Mobile Geochemistry Solana Beach, CA MA & CT, 12/2004 1 VI Requires Much Lower DLs Typical Soil Gas Concentrations MTBE

More information

Steps in Conducting Structural Vapor Intrusion Potential Evaluations Under the Inactive Hazardous Sites Branch 13 February 2017

Steps in Conducting Structural Vapor Intrusion Potential Evaluations Under the Inactive Hazardous Sites Branch 13 February 2017 Steps in Conducting Structural Vapor Intrusion Potential Evaluations Under the 13 February 2017 This document provides the steps for conducting structural vapor intrusion evaluations under the Inactive

More information

VI Investigations in North Carolina What We ve Learned. Delonda Alexander NC Dry-Cleaning Solvent Cleanup Act Program

VI Investigations in North Carolina What We ve Learned. Delonda Alexander NC Dry-Cleaning Solvent Cleanup Act Program VI Investigations in North Carolina What We ve Learned Delonda Alexander NC Dry-Cleaning Solvent Cleanup Act Program delonda.alexander@ncdenr.gov Background Approximately 200 sites in program - VI sampling

More information

RISK BULLETIN. Vapor Intrusion An Emerging Environmental Liability WHAT IS VAPOR INTRUSION?

RISK BULLETIN. Vapor Intrusion An Emerging Environmental Liability WHAT IS VAPOR INTRUSION? RISK BULLETIN Vapor Intrusion An Emerging Environmental Liability From companies that use volatile organic compounds (VOCs) in their processes to firms that develop land, environmental impacts to soil

More information

Navy VI Web Tool: A Systematic Approach for Assessing Strength of Evidence

Navy VI Web Tool: A Systematic Approach for Assessing Strength of Evidence Navy VI Web Tool: A Systematic Approach for Assessing Strength of Evidence EPA Workshop 2012 Donna Caldwell / NAVFAC Atlantic Dr. Loren Lund / CH2M HILL Why Navy Developed VI Evaluation Tool 116 potential

More information

TRANSPORT PATHWAY EVIDENCE OF A SEWER VAPOR. Findings from Work Performed at the Indianapolis USEPA Research Duplex

TRANSPORT PATHWAY EVIDENCE OF A SEWER VAPOR. Findings from Work Performed at the Indianapolis USEPA Research Duplex EVIDENCE OF A SEWER VAPOR TRANSPORT PATHWAY Findings from Work Performed at the Indianapolis USEPA Research Duplex Midwestern States Environmental Consultants Association Spring Seminar Rob Uppencamp May

More information

An RT Regulatory Program Summary

An RT Regulatory Program Summary An RT Regulatory Program Summary NJDEP ISSUES DRAFT VAPOR INTRUSION GUIDANCE In mid-june, the New Jersey Department of Environmental Protection issued draft Vapor Intrusion Guidance, which is very important,

More information

Practical Guide to Vapor Intrusion

Practical Guide to Vapor Intrusion Practical Guide to Vapor Intrusion State Coalition of Dry Cleaners November 2006 Dr. Blayne Hartman H&P Mobile Geochemistry Carlsbad, CA 760-804-9678 www.handpmg.com Bhartman@handpmg.com This training

More information

Oregon Guidance for Assessing and Remediating Vapor Intrusion in Buildings

Oregon Guidance for Assessing and Remediating Vapor Intrusion in Buildings Department of Environmental Quality Overview of Oregon Guidance for Assessing and Remediating Vapor Intrusion in Buildings Brownfields and Land Revitalization 2011 Conference Spokane, Washington May 13,

More information

Measurement of BTX Vapour Intrusion into an Experimental Building

Measurement of BTX Vapour Intrusion into an Experimental Building Measurement of BTX Vapour Intrusion into an Experimental Building Ian Hers Golder Associates Ltd. / University of British Columbia August 15, 2000 Sponsored by: Alberta Environmental Protection (AEP) American

More information

Fast-Track Vapor Intrusion Assessments Using HAPSITE Portable GC-MS

Fast-Track Vapor Intrusion Assessments Using HAPSITE Portable GC-MS Fast-Track Vapor Intrusion Assessments Using HAPSITE Portable GC-MS Presented by: David Shea, P.E. Sanborn, Head & Associates, Inc. May 30, 2014 Building Trust. Engineering Success. Presentation Goal:

More information

SOUTHWEST DIVISION Comparing Air Measurements and Modeling Results at a Residential Site Overlying a TCE Plume October 18, 2004

SOUTHWEST DIVISION Comparing Air Measurements and Modeling Results at a Residential Site Overlying a TCE Plume October 18, 2004 SOUTHWEST DIVISION Comparing Air Measurements and Modeling Results at a Residential Site Overlying a TCE Plume October 18, 2004 Presented by: Wilson Doctor, Remedial Project Manager Ronald J. Marnicio,

More information

Proposed Regulatory Framework for Evaluating the Methane Hazard due to Vapor Intrusion

Proposed Regulatory Framework for Evaluating the Methane Hazard due to Vapor Intrusion VI Specialty Conference Proposed Regulatory Framework for Evaluating the Methane Hazard due to Vapor Intrusion 1 Speaker Bart Eklund, CIH Corporation Austin, TX (512) 419-5436 bart_eklund@urscorp.com 2

More information

INDOOR AIR INVESTIGATION

INDOOR AIR INVESTIGATION NJDEP VAPOR INTRUSION GUIDANCE: INDOOR AIR INVESTIGATION John E. Boyer john.boyer@dep.state.nj.us November 2005 General VI Investigative Procedures Ground Water Soil Gas Indoor Air Recommend collecting

More information

Available Laboratory Methods for Soil Gas Analysis

Available Laboratory Methods for Soil Gas Analysis Available Laboratory Methods for Soil Gas Analysis US EPA Soil Gas Sample Collection & Analysis Workshop San Diego, CA March 21-22, 2007 Gina M. Plantz NewFields Environmental Forensics Practice, LLC gplantz@newfields.com

More information

Vapor Intrusion Pathway: A Practical Guideline. Vapor Intrusion - So What?

Vapor Intrusion Pathway: A Practical Guideline. Vapor Intrusion - So What? Vapor Intrusion Pathway: A Practical Guideline 17 November 2009 New Orleans, LA Vapor Intrusion - So What? August 8, 2005 DANGER BENEATH OUR FEET IS MY FAMILY SAFE? : A COMMUNITY VIEW OF VAPOR INTRUSION

More information

Passive Soil Gas Monitoring for Long-Term Stewardship of Vapor Intrusion Risk

Passive Soil Gas Monitoring for Long-Term Stewardship of Vapor Intrusion Risk Passive Soil Gas Monitoring for Long-Term Stewardship of Vapor Intrusion Risk AEHS Soil, Water, Energy, and Air Ben Martich March 22, 2017 Partners Jim Fish, Alaska DEC Andrew Weller, Ahtna Engineering

More information

An Empirical Approach to Site Assessment for Vapor Intrusion

An Empirical Approach to Site Assessment for Vapor Intrusion An Empirical Approach to Site Assessment for Vapor Intrusion Presented by: Helen Dawson, Hydrogeologist Susan Griffin, Toxicologist USEPA Region 8 Denver, CO NSAS Conference 2007 An Empirical Approach

More information

Diagnosing Vapor Intrusion Occurrence, Impact, and Contributing Pathways

Diagnosing Vapor Intrusion Occurrence, Impact, and Contributing Pathways Diagnosing Vapor Intrusion Occurrence, Impact, and Contributing Pathways Paul C. Johnson Ira A. Fulton Schools of Engineering, Arizona State University w/c. Holton, Y. Guo, P. Dahlen, H. Luo, K. Gorder,

More information

Layering Institutional Controls Region 9 Example. Alana Lee EPA Region 9

Layering Institutional Controls Region 9 Example. Alana Lee EPA Region 9 Layering Institutional Controls Region 9 Example Alana Lee EPA Region 9 March 18, 2014 ICs EPA Guidance Institutional Controls: A Guide to Planning, Implementing, Maintaining, and Enforcing Institutional

More information

Understanding Building Materials Contribution to Indoor Air Quality

Understanding Building Materials Contribution to Indoor Air Quality Understanding Building Materials Contribution to Indoor Air Quality Catherine E. Regan, P.E. ERM Boston, MA R. Joseph Fiacco, P.G. ERM Boston, MA 27 th Annual AEHS International Conference March 2017 Copyright

More information

Initiation of EPA Sponsored Research on Soil Vapor Extraction (SVE) for Area-wide Mitigation

Initiation of EPA Sponsored Research on Soil Vapor Extraction (SVE) for Area-wide Mitigation Initiation of EPA Sponsored Research on Soil Vapor Extraction (SVE) for Area-wide Mitigation Brian Schumacher, John Zimmerman and Rebecca Connell; US EPA Robert Truesdale, RTI International Bo Stewart,

More information

Pneumatic Testing, Mathematical. and Optimize the Performance and. Slab Depressurization Systems

Pneumatic Testing, Mathematical. and Optimize the Performance and. Slab Depressurization Systems Pneumatic Testing, Mathematical Modeling and Flux Monitoring to Assess and Optimize the Performance and Establish Termination Criteria for Sub- Slab Depressurization Systems Todd McAlary, David Bertrand,

More information

A New Passive Diffusion Sampler (PDS) for Soil Gas Sampling

A New Passive Diffusion Sampler (PDS) for Soil Gas Sampling A New Passive Diffusion Sampler (PDS) for Soil Gas Sampling Cynthia J. Paul, John Wilson, Ken Jewell U.S. Environmental Protection Agency Office of Research and Development National Risk Management Research

More information