The HEER office webinar series was launched in 2015 to provide training to State, County and Federal Agencies along with the environmental consultant community to develop a shared understanding of the latest scientific, technical, and policy development affecting cleanups in Hawai'i.

Webinars are broadcast using the ZOOM Webinar and Video Conferencing Service.

If you would like to be included in future webinar and HEER office guidance update notifications then please contact Roger Brewer with the HEER office at roger.brewer@doh.hawaii.gov. We keep emails at a minimum and will not pass your address on to outside parties.

Role of Heterogeneity in Vapor Intrusion (California EPA August 2016):

Originally presented for California EPA staff at the San Francisco Bay Area Regional Water Quality Control Board in August 2016. Topics discussed include: 1) The role of oftentimes unrecognized, small-scale heterogeneity in the reliability of indoor air and in particular soil vapor data, 2) Implications for USEPA’s default, subslab attenuation factors (SSAFs), 3) Use of estimated vapor entry rates and indoor air exchange rates to develop more reliable SSAFs for screening purposes, 4) Development of regional, climate-based, “Vapor Intrusion Risk” regions in the US and within individual states and 4) Use of “Large Volume Purge” and targeted “Decision Unit” volumes of subslab vapors to collect more useful subslab vapor data.

May 2016 - Battelle Conference Presentations

Roger Brewer with the HEER Office presented overviews of field studies of Petroleum Vapor Intrusion and Discrete Soil Sample Reliability at the Battelle Tenth International environmental remediation conference in Palm Springs, California, in May. Audio recordings of the presentations (YouTube) and slides (PowerPoint) can be accessed at the links below. The recordings and presentations include additional notes and ideas from discussions with environmental professionals subsequent to the conference, including a proposed HEER field study of subslab vapor plume heterogeneity and characterization planned for later this summer. Contact Roger Brewer for additional information (roger.brewer@doh.hawaii.gov).

October 21, 2015 - Field Study of Discrete Soil Sample Variability and Reliability: Part 2 - Implications

Roger Brewer of the HEER office discusses how random, small-scale variability of contaminant concentrations in discrete soil samples can lead to erroneous estimations of the extent of contamination, false "hot spots" and "cold spots" on isoconcentration maps and uncertainty in the estimate of contaminant means for use in environmental risk assessments. The presentation concludes with a review of Decision Unit and Multi Increment investigation methods and the use of DU-MIS to characterize PCB-contaminated soil under TSCA.

View Past Webinars

Recordings of past webinars are available for viewing. Clicking on the link below will redirect you to the HEER Office YouTube Channel.

HEER Office YouTube Webinar Series

October 7, 2015 - Field Study of Discrete Soil Sample Variability and Reliability: Part 1 - Results

Roger Brewer of the HEER office reviews the objectives, design and results of a 2014, HDOH field study of the variability of contaminant concentrations within individual discrete soil samples and between co-located samples and discusses initial implications for the use of discrete soil samples in environmental investigations.

September 3, 2015 - Discrete vs Incremental Samples Explained Using Salad

Review of discrete vs incremental soil sampling methodologies and the basics of sampling theory, originally presented by Roger Brewer of the HEER office at the AGC Conference in Arlington, VA, on September 3, 2015. Updated September 19, 2015, to include notes on the use of Incremental Sampling for PCBs under TSCA.

July 27, 2015 - Petroleum Vapor Intrusion: Facts, Fallacies and Implications

Roger Brewer of the HEER office presented an update on Hawaii’s guidance for petroleum vapor intrusion (PVI), in light of recent guidance published by the USEPA and ITRC. Similarities and discrepancies in approaches to PVI were discussed, including a review the field study of the chemistry and toxicity of petroleum vapors carried out by the HEER office in 2013.

May 11, 2015 - Recent Developments in Groundwater Bioremediation and Vapor Mitigation Technologies

Steve Nigro of Regenesis and Kelly Smith of Landscience Technologies were in Honolulu providing a presentation on their respective remedial technologies to the Hawaii Department of Health. This [presentation focused on the science behind their technologies, best uses and a case study. The technologies discussed are Regenesis's Plumestop and Landscience's Geo-Seal and Retro-Coat Systems.

April 15, 2015 - Long-Term Management of Contaminated Soil and Groundwater – Iwilei District, Honolulu

The Iwilei District encompasses approximately 315 acres of land in Honolulu and includes land owned privately and by the State of Hawaii. The Hazard Evaluation and Emergency Response (HEER) Office of the Hawaii Department of Health (HDOH) is overseeing remediation of potentially hazardous contaminants of concern that are present in soil, groundwater, and soil gas at various locations within the Iwilei District. Widespread, shallow petroleum contamination related to past releases from tank farms and pipelines is the primary concern, but metals and pesticides are also present in some areas.

The primary focus of this webinar is outreach for the HEER office development and implementation of a programmatic Environmental Hazard Management Plan (EHMP) for the Iwilei District. This document details remedial measures and controls that are consistent with EHMPs implemented at other sites in Hawaii where contamination is present. No further investigation or remedial action is required at many of these sites, provided that long-term site management requirements in the EHMP are followed.

Steven Mow and Jordan Nakayama (HEER Office)

March 11, 2015 - Use of Active and Passive Soil Gas Samples to Support Vapor Intrusion Investigations

This HEER-sponsored webinar reviews current trends in the evaluation of vapor intrusion impacts to homes and buildings that overlie VOC-contaminated soil and groundwater. Roger Brewer with the HEER office gives a brief overview of a webinar on vapor intrusion held February 18th, 2015. Martin Schmidt with Cox-Colvin, Inc., then provides an overview of active soil gas sampling methods and approaches to improve data quality for evaluation of vapor intrusion hazards. This was followed by a similar presentation on passive soil gas sampling methods by Harry O’Neill of Beacon Environmental, Inc. Topics addressed include the basics of active and passive soil gas sample collection, vapor plume heterogeneity and the use of larger numbers of samples and/or larger-volume samples to provide more reliable data for decision making. Implications for vapor intrusion guidance in Hawai’i as well as on the mainland were discussed.

Download Links

Overview of VI Webinar
Roger Brewer
PowerPoint Presentation no audio
Webinar with Audio on YouTube
Active Soil Gas Sampling
Mort Schmidt
PowerPoint Presentation no audio
Webinar with Audio on YouTube
Passive Soil Gas Sampling
Harry O’Neil
PowerPoint Presentation no audio
Webinar with Audio on YouTube


Roger Brewer, State of Hawaii, Department of Health, Hazard Evaluation and Emergency Response Office

Martin (Mort) Schmidt is currently Practice Leader for vapor intrusion for the consulting firm Cox-Colvin, & Associates in Plain City, Ohio, where he has been employed since 1997. Prior to Cox-Colvin, Mr. Schmidt served as a radon investigator for the Ohio EPA, a geologist for Geraghty and Miller (now Arcadis), and an exploration geologist for Shell International. Mort received his B.S. and M.S. degrees in Geology from the Ohio State University.

Harry O’Neill is the President of Beacon Environmental Services, which is an accredited laboratory and field sampling organization that specializes in the collection and analysis of soil gas and air samples. Mr. O’Neill has managed soil gas investigations for more than 20 years working on federal, state, and commercial projects throughout the United States, as well as internationally across six continents. Mr. O’Neill has been on the forefront of the acceptance of passive soil gas sampling technologies at the national and international level and has overseen the implementation of over a thousand soil gas surveys. He is a member of AWMA, ITRC, and ASTM, is the lead author of ASTM Standard D7758: Standard Practice for Passive Soil Gas Sampling, and has published and presented findings throughout the United States, as well as internationally.

February 18, 2015 - Dungeons, Dragons, Pica Houses and the Need for Alternative, Vapor Intrusion Screening Tools

The presentation reviews current trends in the evaluation of vapor intrusion impacts to homes and buildings that overlie VOC-contaminated soil and groundwater. Implications for vapor intrusion guidance in Hawai’i as well as on the mainland is discussed.

Download Links

PowerPoint Presentation (without audio)
Webinar with Audio on YouTube

Roger Brewer, State of Hawaii, Department of Health, Hazard Evaluation and Emergency Response Office

The presenter is a coauthor of the following paper on vapor intrusion attenuation factors recently published by HDOH staff.
Brewer, R., Nagashima, J., Rigby, M., Schmidt, M. and O'Neill, H. (2014), Estimation of Generic Subslab Attenuation Factors for Vapor Intrusion Investigations. Groundwater Monitoring & Remediation, 34: 79–92. doi: 10.1111/gwmr.12086, http://onlinelibrary.wiley.com/doi/10.1111/gwmr.12086/full

Other Presentations of Interest

The Behavior of Sub-Surface Oil Plumes, in the Real World . . .And some practical observations on how to manage them.

Pat Hughes, former head of the Hawaii Chevron environmental office gave a presentation in April 2013 on LNAPL mobility and related topics. This presentation was based in part on studies that were carried out in the IDPP, Honolulu Harbor area in coordination with the HEER office. The presentation is now available through the above link.

Also see the HEER Events Calendar.