Watch Our Technical Webinars On Demand!

In order to reach a wider audience and deliver valuable technical information, RJ Lee Group has developed a series of new webinars to be viewed on demand. Visit in our ‘Events’ tab to see our upcoming Webinars. You can contact us anytime by visiting the events page on our website, or using the form at the bottom of the page. 

Aggregate Reactions Affecting Concrete Durability

Concrete is the most widely used construction material in the world. The durability of concrete may be described as “the ability of concrete to resist weathering action, chemical attack, and abrasion while maintaining its desired engineering properties” (PCA). The durability of concrete is influenced by a number of factors including design, materials, mixture, placement and exposure. This Webinar will discuss the role of aggregate selection and quality, with particular focus on the chemical reactions, alkali aggregate reactions and pyrrhotite oxidation. The presenter will discuss the existing test methods and guidance documents for evaluating aggregate sources, and the challenges involved. She will also discuss recommendations for testing, monitoring, and documentation.

Validating Mineral Product Safety:
Using Science To Determine GHS and HazCom Classifications

Employing scientifically validated methods for toxicological characterization, this discussion details a host of internationally accepted techniques used to achieve Hazard Inversion. This highly regarded presentation intermingles GHS classification exemptions with a real-world example of the hazard reclassification process.  In addition to engaging audience members to reconsider their own As-Presented product scenarios, participants will be provided with a recent case study and real-world example of Hazard Inversion success.

Fly Ash Hazards, Misconceptions & Analytical Data: How a Top-Down Scientific Approach Cleared Class C, Class F and Reclaimed Fly Ashes From GHS/HazCom Hazard Classification

In 2016, RJ Lee Group’s Product Stewardship team was tasked with assessing the potential hazards associated with Class C Fly Ash products. As a part of this work, our team was also contracted to prepare Safety Data Sheets (SDS) and Hazard Labels in compliance with GHS/HazCom 2012 regulations. Knowing the many stated risks associated with Fly Ash materials, we expected these Class C products to demonstrate hazardous characteristics and thus, require hazard labeling, protective measures and controls. 

Gunshot Residue Sample Collection: An Overview

Gunshot residue (GSR) can be valuable forensic evidence when presenting a case in a court of law.  It's important that a jury understands the process by which samples are collected, and are able to evaluate the importance of the results.  You can help to mitigate the work of the forensic scientist by ensuring that you are using proper sampling techniques.  This webinar will give you an overview of sampling products, collection procedures, and will strive to answer your scenario-based questions.  We hope that you will join us!

Questions? Contact us today! 

About Our Presenters

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Don Ewert is a consulting specialist in the complex science of Product Stewardship and oversees GHS/HazCom/WHIMS support services for RJ Lee Group. He has practiced in the field of Industrial Hygiene and Safety for more than 30 years and possesses both an educational background and career expertise in Toxicology, Epidemiology and Medical Management. Professionally, Don has served as Corporate EH&S Manager for numerous Fortune 500 companies and as both industry liaison to Pinnacol Assurance and as Research Scholar in the Center for Environmental Toxicology and Technology at Colorado State University. He is currently recognized as a peer-reviewed, full member of the American Industrial Hygiene Association, Society of Toxicology and the Occupational Toxicology Roundtable. 


Ms. Snyder has over 20 years’ experience in concrete petrographic studies and serves as the Construction Materials Laboratory Manager at RJ Lee Group. She conducts evaluations of cementitious materials to identify failure and distress mechanisms using petrographic techniques in combination with chemical and physical testing.  Ms. Snyder is a leader in the application of scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS) techniques to cementitious materials. Her expertise is in concrete and cementitious materials failure investigations in which she has evaluated concrete from around the world including bridge structures, parking garages, piers, and airfield pavements, as well as coating system failures and cementitious product evaluations.  She has broad knowledge of analytical testing and instrumentation and their application to problem solving for raw material and composite evaluations.  Ms. Snyder is also well-versed in forensic investigations of particulate including source apportionment and indoor air quality.

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Dr. Harry Behzadi is currently the Vice President of Emerging Technologies for RJ Lee Group, and has worked in Business Development for SGS‐EHS North America. Dr. Behzadi was the Vice President of Operations for TestAmerica Inc. in the Eastern and Western regions.  In a prior role, he was the VP of Operations and Corporate Technical Director at Accutest Laboratories, Inc. Dr. Behzadi spearheaded growth and expansion at Accutest Corporation in the Southeast and beyond to the West Coast. He started the Southeast division in 1995 and grew the staff from a few employees to 90+ employees, which became one of the largest environmental laboratories in the South.

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Antonios Tasoglou, Ph.D., is a Senior Scientist and PTR-MS Specialist at RJ Lee Group. Prior to his work he participated in numerous projects that focused on the study of the atmospheric pollution both in the gas and particle phase. During his Diploma work he joined the FORTH ICE-HT (Patras, Greece) as a research assistant. His research work included extensive air quality measurements as part of the European Research Council ATMOPACS project, which led to the identification of the main sources of air pollution in the city of Patras.

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Paul Ioannidis is the Laboratory Director for Columbia Basin Analytical Laboratories (CBAL), the Pasco, Wa. division of RJLG. Paul has over 30 years of experience in Laboratory Operations, Business Development and Customer Relations Management. He has helped create the Client Relationship Management Program within the RJ Lee Group, as well as working with the company’s management in creating and executing its Strategic Planning and growth program and formulating strategic partnerships. He works to bring the company’s technologies and services to both the domestic and international markets. Paul holds advanced degrees in Environmental Sciences and International Relations.

More RJ Lee Group Services

Industrial Hygiene

We identify, evaluate, analyze, and suggest control measures for environmental elements that originate in the workplace and may cause potential source of risk to workers or the environment.

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PTR-MS & Indoor Research

RJ Lee Group (RJLG) teamed up with researchers at academic laboratories to investigate the impacts of normal living conditions on air quality.
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Environmental Health & Safety

Whether testing to support product MSDS or label requirements, detecting contamination in particulate or chemicals in vapor, or examining raw material or regulated industrial waste, RJ Lee Group materials experts work with industry clients in a mutual concern for workers’ health and safety.

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