The Role of Asbestos Inspections in Construction Safety: Don't Miss the Asbestos Inspection Panel at PACNY's Environmental Conference!

In the construction world, one of the most pressing concerns for worker safety is the potential asbestos exposure.  This hazardous material, once commonly used in various building materials for its fire-resistant and other properties, has been linked to serious health risks, including lung cancer, asbestosis, and mesothelioma.  Asbestos exposure remains a significant threat, especially in older buildings undergoing renovation or demolition.  The Environmental Protection Agency (EPA) and the Occupational Safety and Health Administration (OSHA) have set strict guidelines to minimize this danger, but compliance hinges on one key factor: thorough and accurate asbestos inspections.

To explore the intricacies of asbestos inspections, Angelo Garcia, III of Future Environment Designs, Inc., will be moderating a distinguished panel at PACNY's 2025 Environmental Conference on Thursday, February 27, 2025. The panel will dive deep into the importance and differences in asbestos inspections from various perspectives. This includes Tom Laubenthal of TGL Consulting and ASTM E2356 Chairman, who will discuss the ASTM asbestos inspection standard, Chris Alonge now with Dormitory Authority of the State of New York (DASNY) who will provide insights from an owner's perspective, Marc Rutstein from Environmental Consulting & Management Services, who will offer a consultant's viewpoint and highlight the differences between NYCDEP and NYSDOL inspections, and Matt Brooks from International Asbestos Removal (IAR), who will speak on the contractor’s perspective.

Asbestos pipe insulation with fitting insulation

Asbestos inspections play a vital role in identifying materials that may contain asbestos before they are disturbed. This proactive approach not only prevents worker exposure but also ensures that proper abatement procedures are followed. A well-executed asbestos inspection is the first line of defense against the release of airborne asbestos fibers, which can be deadly when inhaled.

Understanding the Importance of Homogeneous Areas

At the heart of every asbestos inspection is the process of determining whether a material is classified as a surfacing material, thermal system insulation, or miscellaneous material.  Once the material type is identified, the inspector must establish whether the materials are homogeneous.  According to the EPA’s Asbestos Hazard Emergency Response Act (AHERA), a homogeneous area is defined as one where the material is uniform in color and texture.  

Floor tiles and numerous homogeneous areas

However, that is not the only definition of homogeneous area/material.  For example, the American Society for Testing and Materials (ASTM) has established a Standard Practice for Comprehensive Asbestos Surveys (ASTM E2356-18) in this standard the definition of homogeneous area is surfacing material, thermal system insulation material, or miscellaneous material that is uniform in color and texture and apparent or known date of installation. The other definitions that are used by inspectors also include some reference to installation or formulation in addition to color and texture.  This classification is crucial because it informs the number of samples that must be taken to accurately assess the presence of asbestos.

Sampling Procedures: The Foundation of a Successful Inspection

For surfacing materials, the size of the homogeneous area directly influences the number of samples needed. Under the EPA’s guidelines, inspectors follow the “3-5-7 rule.” This means that three samples are required for areas smaller than 1,000 square feet, five samples for areas between 1,000 and 5,000 square feet, and seven samples for areas larger than 5,000 square feet. Additionally, the EPA’s “Pink Book,” formally known as Asbestos in Buildings: Simplified Sampling Scheme for Friable Surfacing Materials, recommends taking nine samples per homogeneous area, regardless of the square footage, for increased accuracy.

Asbestos Fireproofing

For thermal system insulation, the process differs slightly. Inspectors must determine if the material is homogeneous, patch material, or material used on fittings like elbows and valves. Homogeneous areas of thermal system insulation require three samples, while patch materials smaller than six linear or square feet only need one sample (the only time one sample is allowed). Cement or plaster used on fittings must be sampled based on the specific mechanical system in question, and a minimum of two samples is required for each system. However, the EPA in A Guide to Performing Reinspections Under AHERA strongly advises taking at least three samples in larger homogeneous areas, even if regulations don't mandate it.

For materials such as joint compound and add-on materials, however, the EPA’s “Asbestos Sampling Bulletin dated September 30, 1994” specifies that three samples are required for each material. These distinctions are critical for asbestos inspectors to ensure compliance and accuracy in their assessments (see our original blog post on asbestos surveys).

In May 2007, the EPA provided important clarification on sampling requirements.  Mr. Chris Alonge, at the time, was working for New York State Department of Labor (NYSDOL) and he requested clarification regarding the number of samples that should be taken for each suspect asbestos-containing homogeneous miscellaneous material.  The clarification was distributed by the Professional Abatement Contractors of New York (PACNY) in November 2007. According to this clarification, the minimum number of samples that should be taken of miscellaneous materials (i.e., floor tiles, roofing, caulk, ceiling tiles) is two (see our original blog post on this issue).

Respirator and protective clothing should be worn by the inspector during sampling

Following proper sampling protocols is crucial because asbestos is considered present if any one of the samples from a homogeneous area contains more than 1% asbestos. Conversely, if all samples return asbestos concentrations at or below 1%, the area is deemed asbestos-free—though it’s important to remember that materials containing 1% or less of asbestos are still regulated under OSHA’s asbestos standard (see the Varga letter).

The Legal and Health Implications of Incomplete Inspections

Inadequate or incorrect asbestos inspections can have severe consequences.  From a legal standpoint, failing to adhere to EPA and OSHA regulations can result in hefty fines and penalties.  Remember neither regulation has a specific end date for buildings not containing asbestos (see our post Is There an Appropriate End Date for Asbestos Use?).  More importantly, from a health perspective, improperly identifying or failing to identify asbestos-containing materials (ACMs) can expose construction workers to dangerous fibers, leading to long-term health problems.  Given that asbestos-related diseases may take decades to develop, the human cost of negligent inspections can be devastating.

The closet door with asbestos core was cut without any precautions costing over $30,000 to clean up the contamination.

Mr. Tom Laubenthal wrote EPA in November 2014 regarding The Standard Practice for Comprehensive Asbestos Surveys (ASTM E2356-18) Pre-Construction Survey (section 8 of the standard) meeting the requirement under National Emissions Standards of Hazardous Air Pollutants (NESHAPS) of a thorough inspection.  EPA responded that they would expect an owner/operator to follow the steps in Sections 1 through 5 and Section 8 to comply with the NESHAPS regulation. This standard provides a framework for conducting thorough asbestos inspections, particularly in pre-construction scenarios, ensuring that no asbestos-containing material goes unnoticed.

Conclusion: The Essential Role of Inspections

Asbestos inspections are the cornerstone of any effort to protect workers from exposure to this hazardous material. By adhering to the EPA’s and OSHA’s strict sampling and inspection guidelines, inspectors can identify asbestos-containing materials before they are disturbed, reducing the risk of airborne fibers and subsequent health issues. Given the serious implications of asbestos exposure, thorough inspections are not just a regulatory requirement—they are a moral imperative in safeguarding the health and well-being of workers.

Asbestos Floor Tiles disturbed before identification led to a clean-up costing over $250,000

In the end, the responsibility lies with all stakeholders—building owners, contractors, and asbestos inspectors alike—to ensure that every construction or renovation project is free from asbestos hazards. As inspectors, staying current on regulations, maintaining rigorous sampling standards, and educating clients on the risks and regulations associated with asbestos are critical components in this ongoing battle against a deadly substance.

The asbestos inspection panel promises to be an invaluable session for professionals across the construction, consulting, and regulatory industries. With these diverse viewpoints, we aim to shed light on the critical role inspections play in protecting workers and ensuring compliance with ever-evolving asbestos regulations.  Asbestos inspections are not just about checking boxes—they are about saving lives.

Future Environment Designs wishes all of you a Merry Holidays and a Happy New Year! EPA delivers an early holiday present!

As we say goodbye to 2024 and welcome 2025, we reflect on 2024 and how it has changed us.  2024 has been a good year for Future Environment Designs which helps to keep the business viable as we enter our 37th year in business. We are still working on a balance between the company and our personal life. Which at times can be so entertwined.

PACNY's Holiday Meeting at Skaneateles, NY 

Future Environment Designs is looking forward to 2025 as many of our clients have asked for initial courses in the coming year and we look forward to assisting them with their needs.  We will continue to service the other areas of the State (such as Plattsburgh, Rochester, Syracuse, Hudson Valley, and Buffalo) looking for quality training.  Thank you to all our clients for helping us maintain a 4.8 rating out of 5 for another year! Your positive feedback means a lot to us. If you'd like to share your experience, please visit our course reviews at CourseCheck.  We look forward to continuing our work on the Professional Abatement Contractors of New York (PACNY) Board of Directors (if reelected), event, and communications committees.  In addition, some indoor air quality consulting work has also come through the door for the New Year we look forward to meeting those needs, too.  

Anthony's Restaurant in Plattsburgh, NY

On a more global note, the Environmental Protection Agency (EPA) announced on December 3, 2024, that it has determined that disturbing and handling asbestos associated with legacy uses, and asbestos as a chemical substance, poses an unreasonable risk to human health.  EPA's Risk Evaluation for Asbestos Part 2: Supplemental Evaluation Including Legacy Uses and Associated Disposals of Asbestos - Part 2 of the Risk Evaluation for Asbestos, EPA considered chrysotile (serpentine), crocidolite (riebeckite), amosite (cummingtonite-grunerite), anthophyllite, tremolite, actinolite, and Libby Amphibole Asbestos (and its tremolite, winchite, and richterite constituents).  EPA considers this expansion to be consistent with the focus of Part 2 of the Risk Evaluation for Asbestos on legacy uses and associated disposals.  Additionally, the EPA assessed the relevant conditions for the use of asbestos-containing talc because talc has been implicated as a potential source of asbestos exposure.

Rockefeller Centre, NYC

It will be interesting moving forward since this announcement means rules or regulations must be promulgated to mediate the risk.  Especially with a new administration that is looking to reduce regulation.  It will be interesting to see if we get another SNUR.  See our post on the SNUR.  Several items we hope will be addressed:

• a National Aggressive TEM Clearance requirement for all-size asbestos projects.  Read my post regarding clearance.
• a reduction of the exposure limit for all asbestos workers.  Remember EPA in Part One set an exposure limit of 0.005 f/cc for chlor-alkali workers.  Read my post regarding Part One. 
• in addition, a plan to replace phase contrast microscopy with a better method for evaluating worker exposures.
• Getting rid of the greater than 1% rule for asbestos-containing materials (ACM).  Changing it to any percentage even trace amounts would eliminate some confusion between EPA and OSHA regulations.
• Coming up with a method for handling Libby-Amphibole Asbestos.

Bergdorf Goodman, NYC

On a personal note, we will miss our youngest sister Dr. Melissa Garcia who passed on in May. This has altered our view of things a bit. How short life is and the time we have on this planet can end at any time. Specifically, most will not see much of a difference because we have always been a positive (glass half-full) person. Though we're starting to feel our age.  Our worries and cares are very different now and going forward.

Bryant Park, NYC

We look forward to seeing many of you in 2025 as we continue our journey together!

Re-Post of our 20 Year Anniversary of 9/11, 10-Year Anniversary of the World Trade Center Health Program. Lesson Learned?

On September 11, 2001, Future Environment Designs (FEDTC) was teaching an asbestos supervisor refresher and an asbestos inspector initial course at the Underhill Blvd. Syosset office.  We were some of the fortunate individuals who were not in New York City when terrorists hijacked airplanes and proceeded to fly them into the World Trade Centers (WTC), the Pentagon, and crashed another in Pennsylvania.  On that day hundreds of thousands of people were exposed to a massive cloud of toxic gases and particulates from the terrorist attack on the WTC.  Significant failings by the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) led to tens of thousands of people who participated in the ensuing rescue, recovery, and clean-up efforts being exposed to the WTC toxic dust.  Nearly a half million people are estimated to be at increased risk of adverse health effects from exposures to physical, psychological, and emotional stressors in the days, weeks, and months following the terrorist attacks.  This year we honor their sacrifice on the 20th Anniversary of the attack on the World Trade Center.  On January 2, 2011, the James Zadroga 9/11 Health and Compensation Act of 2012 (the Zadroga Act) created the World Trade Center Health Program (WTCHP).  The WTCHP is administered by the director of the National Institute for Occupational Safety and Health (NIOSH).  So this year is also the 10th Anniversary of the WTCHP.  

We have no intention of changing our logo which depicts the NYC skyline with the WTC.

The WTCHP provides medical monitoring and treatment of covered health conditions for emergency responders, survivors, recovery and cleanup workers, and volunteers who helped at the WTC, the Pentagon, and the crash site near Shanksville, Pennsylvania, and maintains a research program aimed to improve the care and well-being of the affected population.  The WTCHP serves four groups of people affected by the 9/11 attacks:

• Fire Department of New York Responders,
• World Trade Center General Responders,
• World Trade Center Survivors (lived, worked, or went to school in NYC Disaster Area), and
• Pentagon/Shanksville Responders

From Express - 9/11 firefighters still Dying 20 years on - Devastating graph exposes the harrowing impact

As of December 31, 2020, 108,666 individuals have enrolled in WTCHP.  The ten most common certified conditions are:

• Chronic Rhinosinusitis
• Gastroesophageal Reflux Disease (GERD)
• Cancers
• Asthma
• Sleep Apnea
• Post-Traumatic Stress Disorder (PTSD)
• Chronic Respiratory Disorder - Fumes/Vapors
• WTC-Exacerbated Chronic Obstructive Pulmonary Disease (COPD)
• Anxiety Disorder (Not otherwise specified)
• Major Depressive Disorder

As the years go by, it will be interesting to see if this list changes.  In FEDTC's asbestos training courses, we discuss the latency period for asbestos-related diseases (asbestosis, lung cancer, and mesothelioma) are 10-50 years from the date of the first exposure.  In the next 5-10 years we will hit the beginning of the latency period for lung cancer and mesothelioma.  Currently, cancers only account for about 13% of WTCHP certified conditions with non-melanoma skin cancer (27%) and prostate cancer (21%) being the top two cancers.  Comparison studies indicate that prostate and thyroid cancer are elevated compared to other groups (without WTC toxic dust exposure). Other excess cancers at this time include bladder cancer, malignant melanoma, multiple myeloma, leukemia, and non-Hodgkin lymphoma.

It was published after the completion of the rescue, recovery, and clean-up efforts that there were no fatalities.  However, that isn't quite correct since we are seeing rescue, recovery, and clean-up workers dying from their exposure to the WTC toxic dust.  It is good to see that what occurred during the rescue, recovery, and clean-up at the WTC was not repeated at the recent rescue, recovery, and clean-up efforts at the Miami condo collapse.  As the picture below, from The Guardian, shows, rescue crews are wearing respirators to protect them from the potentially toxic dust from the collapse of that building.  If this is the lesson learned from the WTC tragedy, it was a hard lesson but one that will protect workers in other rescues, recoveries, and clean-ups in the future.  

 

The Guardian

Miami condo collapse: death toll rises to nine as crews search pile for survivors | Miami condo collapse | The Guardian

Future Environment Designs Celebrates Labor Day by Remembering Those Who Made Sacrifices!

 Future Environment Designs (FEDTC) wishes everyone a Happy Labor Day weekend!  We hope everyone takes the time to remember that today we are celebrating the contributions of the labor movement to the development and achievements of the United States of America (USA).  Many workers have sacrificed their lives in making these achievements.  On average, almost 100 workers are killed every week in the United States due to traumatic injuries suffered at work. Over 20 times as many die from occupational diseases, many due to exposure to hazardous substances many years before they died (for example, asbestos, silica, and coal dust) or from COVID-19 acquired at work.  It is important to remember those who made these sacrifices while working on the job.  These sacrifices also cost businesses profitability and increase workmen's compensation costs.  The Occupational Safety and Health Administration (OSHA) has created a tool to show the impact different types of injuries cost businesses.  

The United States Labor Department has produced a video to remember the history behind the creation of Labor Day.  Future Environment Designs hopes as we enjoy this weekend, we remember the importance and the sacrifices each of us makes to keep achieving and developing the USA, and even more importantly we remember solidarity, the sense that each of us should look out for the interests of all!

Day Two of PACNY's 27th Annual Environmental Conference: Key Updates and Interactive Sessions, Part Two

The second day of the 27th Annual Environmental Conference hosted by the Professional Abatement Contractors of New York (PACNY) at Turning Stone Casino continued to deliver valuable insights and critical updates for industry professionals. As a Sapphire Sponsor, Future Environment Designs, Inc. was proud to be part of this informative and engaging event.

Long Island Contingent - Matthew Brooks, IAR and Chuck Merritt, Merritt Environmental Consulting

State of PACNY: Leadership Insights and Organizational Updates

The day began with an address from Kevin Hutton, PACNY President, and Craig Kaputa, PACNY Past President, who provided an overview of the state of PACNY. Their presentation highlighted the organization's accomplishments over the past year, ongoing initiatives, and future goals. The duo emphasized PACNY's commitment to advancing industry standards and supporting its members through education, advocacy, and networking opportunities.  Angelo Garcia, III was honored by receiving the PACNY's President Award for his efforts in handling the LinkedIn postings for the conference, sitting on the conference planning committee, and participating as a Board Member. 

Kevin Hutton, PACNY President and Craig Kaputa, PACNY Past President Awarding Angelo Garcia, III the President's Award

Interactive Keynote: Navigating an OSHA Inspection

The keynote speaker, Mike Rubin of Ogletree Deakins, delivered an impactful and interactive session, "An Interactive Walk Through an OSHA Inspection." Rubin's presentation was a deep dive into the intricacies of handling OSHA inspections, focusing on key points that every employer must know:

• Know Your Rights: Employers should be well-versed in their rights during an OSHA inspection to ensure they are adequately prepared.
• Scope of Inspection: It is crucial to verify that OSHA's requests are within the scope of the inspection to avoid unnecessary overreach.
• Cooperate But Be Informed: While cooperation with OSHA inspectors is essential, employers should remain informed and vigilant about their rights and obligations.
• Document Requests in Writing: Employers should always request that OSHA put their document requests in writing to maintain clear and accurate records.

Rubin's interactive approach, including role-playing scenarios, allowed attendees to gain practical knowledge and confidence in managing real-life OSHA inspections.

Keynote Speaker Michael Rubin of Ogletree Deakins

Vendor Exhibition and Networking: Engaging with Industry Leaders

Following Rubin's session, attendees had the opportunity to network and explore the vendor exhibition hall during the final coffee break. The exhibition hall was bustling with activity as professionals connected with vendors, discovered the latest industry products, and shared experiences and insights.

Vendor Exhibit Hall

NYSDOL Presentations: Streamlining Processes and Introducing New Capabilities

The late morning session featured a series of presentations from key representatives of the New York State Department of Labor (NYSDOL) Asbestos Control Bureau.  Matthew Robinson-Loffler, Deputy Director of the Division of Safety and Health, began by highlighting improvements in the licensing process for asbestos and mold professionals. He noted that filing applications through the MPWR website ensures that paperwork is handled by department personnel within 24 hours, significantly speeding up the turnaround time for obtaining licenses and certificates.

Matthew Robinson-Loffler - NYSDOL Deputy Director of Division of Safety and Health

The most significant announcement from NYSDOL was the introduction of online variance filing through the MPWR website. Chek Beng Ng, Program Manager of the Engineering Services Unit, provided a detailed walkthrough of the new variance filing process. He demonstrated how to navigate the system and submit variance requests efficiently. Chek Beng Ng also addressed numerous questions from attendees, clarifying various aspects of the process. It was evident that while the new online system is a work in progress, it represents a significant step towards streamlining administrative procedures.

Chek Beng Ng, NYSDOL Program Manager of the Engineering Services Unit

Kirk Fisher, Program Manager of the Asbestos Control Bureau, concluded the NYSDOL presentations by reinforcing the importance of compliance.  This year we had one of the highest attendances from the different District Offices of NYSDOL's Asbestos Control Bureau.

NYSDOL Asbestos Control Bureau Attendees

Networking Lunch: Building Connections and Fostering Collaboration

The conference concluded with a networking lunch, offering attendees a final opportunity to engage with peers, discuss the day's insights, and establish new connections. The collaborative atmosphere fostered by PACNY's conference emphasized the importance of community and shared knowledge in advancing the environmental industry.

As we reflect on the second day of PACNY's 27th Annual Environmental Conference, it is clear that the event successfully provided valuable updates, practical knowledge, and opportunities for professional growth. Future Environment Designs, Inc. looks forward to continuing our involvement with PACNY and supporting the industry's ongoing efforts to enhance safety, compliance, and innovation.  We look forward to seeing everyone at the 28th Annual Environmental Conference on February 27th and 28th, 2025. 

The Fallacy of Asbestos Clearance Air Sampling, or 5 Reasons Why We Should Stop Using Phase Contrast Microscopy for Clearance.

The Environmental Protection Agency's (EPA's) Asbestos Hazard Emergency Response Act (AHERA) regulation introduced the requirement of clearance sampling after an asbestos abatement project was completed.  The AHERA regulation applies to schools from Kindergarten to 12th grade (K-12), both public and private schools.  However, for all intents and purposes, the AHERA method of clearance serves as the industry standard when final clearance is performed for most asbestos abatement projects, especially when areas are to be re-occupied.  The requirements for clearance are found in two sections of the rule:

• Response Actions; §763.90 (i)
• Appendix A (to Subpart E) - Interim Transmission Electron Microscopy Analytical Methods - Mandatory and NonMandatory - and Mandatory Section to Determine Completion of Response Actions

AHERA allows final clearance air sampling to be done by phase contrast microscopy (PCM) methodology for projects less than or equal to 160 square feet (SF) or 260 linear feet (LF) by the National Institute for Occupational Safety and Health (NIOSH) 7400 methodology (Issue 3: 14 June 2019 is the current issue).  For projects greater than 160 SF or 260 LF clearance shall be done by the AHERA transmission electron microscopy (TEM) method (requirements at 763.90 (i) (4) and Appendix A).  Since this article's purpose is to discuss why we should not be using the PCM method we will focus our discussion on this method specifically.  An important point to remember is that the method was designed for personal sampling of workers in environments with actual asbestos exposures.  AHERA adapted the method for clearance requiring that each sample must be less than or equal to a limit of quantitation (LOQ) for PCM of 0.01 fibers per cubic centimeter (f/cc).

Over the years, it has become abundantly clear that the PCM method should not be used for clearance sampling.  The top five reasons it should not be used for clearance sampling are:

Size of the Fibers Analyzed

The rules for the NIOSH 7400 method specifically require the microscopist to count only fibers that are greater than 5 micrometers (microns) length.  When it comes to diameter it is questionable whether fibers less than 0.25 microns in diameter can or cannot be detected by the method.  All other fiber lengths and narrow widths are not counted they are too thin with normal PCM resolution.  At the Professional Abatement Contractors of New York 2023 Environmental Conference, Lee Poye, Vice President Emeritus, Eurofins Built Environment, discussed his presentation "Asbestos in Human Tissue and the Environment - Does Size Matter?"

Lee Poye Presenting at PACNY 2023

According to his presentation, in an article titled "Short, Fine, and WHO Asbestos Fibers in the Lungs of Quebec Workers With an Asbestos-Related Disease" by G. Adib, F. Labreche, L. DeGuire, C. Dion, & A. Dufresne and published in the American Journal of Industrial Medicine in 2013 the type of fibers that are seen in diseased tissue are less than 5 microns and less than 0.25 microns in width.

 

Lee Poye Presenting at PACNY 2023

Mr. Lee Poye's own research (not published) found a similar finding see below.  Based on his presentation, we know that size does matter regarding diseased human tissue.  Mr. Poye's conclusion from his presentation were:

• What's the skinniest PCM fiber a "typical AMT" can see? 0.18 micron.
• Just how much chrysotile is missed by PCM? Almost ALL of it!
• What % of chrysotile fibers detected in human tissue would've been visible by PCM?  Maybe 2% to 3% at best!

Lee Poye's Own Research at PACNY 2023 

Considering between 98-99% of the chrysotile fibers that are seen in the tissue of diseased lungs are not seen by the PCM method.  Why are we using a method that does not detect the fibers that actually cause disease for clearance?

Is the Work Area Actually Clean?

In 2003, Applied Occupational and Environmental Hygiene published a study called "Asbestos Release During Removal of Resilient Floor Covering Materials by Recommended Work Practices of the Resilient Floor Covering Institute" by Marion Glenn Williams, Jr. and Robert N. Crossman, Jr. from the University of Texas Health Center at Tyler, Tyler Texas.  The major points from this study were:

• Asbestos used in flooring materials is Grade 7 - Shorts and Floats.  The dimensions of this material are very small and may not be resolvable by the Polarized Light Microscope (PLM).  This is why New York State Environmental Laboratory Approval Program (NYS ELAP) requires floor tiles to be analyzed as a nonfriable organically bound (NOB) material (analysis by PLM and if negative result for asbestos, then analysis by TEM).
• Many research studies have found the preponderance of fibers at autopsy left in lung tissue, pleural plaques, and lymph nodes of persons who have occupational asbestos exposure are shorter than 5 microns in length.
• The NIOSH 7402 TEM method is flawed because it underreports the amount of asbestos in the samples because it ignores all fibers less than or equal to 5 microns and all those fibers longer than 5 microns but less than 0.25 micron in diameter.
• AHERA TEM method counts for total asbestos structures per cubic centimeter averaged 22 times greater than the PCM fiber counts on the same filters.
• AHERA TEM asbestos concentrations obtained during mastic removal with a commercial mastic remover averaged 11 times higher than those measured when removal used amended water.
• The study also found that there was considerable amounts of asbestos dust settled on exposed surfaces during tile removal.  Indicating a need to thoroughly HEPA vacuum and wet clean surfaces or dust may remain that could be re-entrained by occupant activity.
• The study also indicates that workers in these areas, would not have to wear respirators, so anyone in these areas would have inhaled asbestos fibers or structures of respirable dimensions.

At the 2017 PACNY Environmental Conference a debate occurred about our call for TEM clearance sampling for all asbestos floor tile projects based on the above study.  This debate led to our writing the article Asbestos Floor Tile Debate Results Post and our article in Healthy Buildings.  Our major points were:

• When using the AHERA TEM method for clearance, what was the typical size of the fibers found?  The answers we got were 58.8% less than 5 microns; 29.4% of both sizes were equal amounts; and 11.8% greater than 5 microns.
• Have you ever encountered during asbestos flooring removal when utilizing both the NIOSH 7400 (PCM) & the AHERA (TEM) methods of analyses, that the NIOSH 7400 passed while the AHERA TEM method failed?  The answers we got were 52.6% yes, 36.8% no, and 10.5% never used both.
• AHERA TEM method counts for total asbestos structures per cubic centimeter averaged 22 times greater than the PCM fiber counts on the same filters.

• AHERA TEM asbestos concentrations obtained during mastic removal with a commercial mastic remover averaged 11 times higher than those measured when removal used amended water.

At the 2020 PACNY Environmental Conference – Jack Snider, III CSP LAC, GC of AMRC presented on Take-Home Asbestos Exposure. During the removal of floor tile, mastic, and other non-friable ACM, workers are typically wearing street clothes into the work area, and they are not showering nor vacuuming themselves/their clothing upon exiting the containment.  

Mr. Snider's presentation found workers performing floor tile projects had significant Take-Home Asbestos Exposure.  These points all bring up the question of whether the work area is actually clean when we use the PCM method.  Many building abatement projects are passing by PCM that would not pass clearance by TEM.  

Is 0.01 fibers/cubic centimeter (f/cc) Safe?

Well based on the World Health Organization (WHO), and the EPA there is no safe level of exposure.  If we look at how many asbestos fibers we are breathing in at 0.01 f/cc if we were making a moderate effort it would be approximately 100 asbestos fibers per minute or for an 8-hour day it would be 48,000 asbestos fibers.  If we look at the amount of asbestos fibers in a cubic foot of space it would be 283 asbestos fibers/CF.  So what is the risk at 0.01 f/cc?  In 2021, the Committee for Risk Assessment (RAC) prepared an expert opinion for the European Chemical Agency (ECHA) on the scientific evaluation of occupational exposure limits for asbestos. They have concluded that there is no “safe” level of asbestos exposure. Instead, they provided an exposure-risk relationship to express the excess risk of cancer at different levels of asbestos exposure.  According to the RAC, the risk of excess lifetime cancer risks is 12 cases per 100,000 exposed at 0.01 f/cc. 

Compare that risk with the following, in 2022, 1,069 construction professionals died while working, a rate of 9.6 fatalities per 100,000 full-time workers, according to a report by the Bureau of Labor Statistics.  That fatality rate was the third highest, behind agriculture, forestry, fishing and hunting (18.6 per 100,000) and transportation and warehousing (14.1 per 100,000).  Realize the current Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (PEL) is 0.1 f/cc based on an 8-hour time-weighted average (TWA) and according the RAC that risk is 125 per 100,000 exposed.

Industry, occupation, and exposure history of mesothelioma patients in the U.S. National Mesothelioma Virtual Bank, 2006–2022 found these points:

• Among the 1023 industries recorded for those having mesothelioma, the most frequent cases were found for those in manufacturing (n = 225, 22.0%), construction (138, 13.5%), and education services (66, 6.5%)….
• Males (583) or persons aged >40 years (658) at the time of diagnosis tended to have worked in industries traditionally associated with mesothelioma (e.g., construction), while females (163) or persons aged 20–40 years (27) tended to have worked in industries not traditionally associated with mesothelioma (e.g., health care). 

Malignant Mesothelioma Mortality — United States, 1999–2015 Weekly / March 3, 2017 / 66(8);214–218 Jacek M. Mazurek, MD, PhD1; Girija Syamlal, MBBS1; John M. Wood, MS1; Scott A. Hendricks, MS2; Ainsley Weston, PhD1 found:

• Current occupational exposure occurs predominantly during maintenance and remediation of asbestos-containing buildings.
• Continuing occurrence of malignant mesothelioma deaths in persons aged <55 years suggests ongoing inhalation exposure to asbestos fibers and possibly other causative EMPs.

The above table is from the above referenced material.  However, we have added the last column based on a 30-year latency period which gives an interesting perspective based on when the person most likely was exposed to asbestos.  Consider that over 650 individuals were most likely exposed before working age.  this could result from exposures due to take-home exposure, do-it-yourself projects, or from attending schools that are not managing asbestos properly.  It is also interesting to note that the number of mesothelioma deaths between 1999-2015 has remained roughly the same, between 2479-2873 individuals. 

Based on all this information a better clearance level would be 0.001 f/cc and a better occupational exposure limit would be 0.01 f/cc or 0.005 f/cc as an 8-hour TWA.  In November 2023, the European Union has adopted a reduction of the exposure limit for workers to 0.01 f/cc as an 8-hour TWA and after a maximum transition period of six years, member states will have to switch to electron microscopy.  In addition, in the EPA's chrysotile asbestos ban beginning November 5, 2024,....no person is exposed to an airborne concentration of chrysotile asbestos in excess...0.005 fibers per cubic centimeter (f/cc) as an 8-hour time-weighted average (TWA).  Considering all of this it is obvious 0.01 f/cc is not an appropriate level for clearance.  Utilizing TEM for clearance would ensure we are achieving the lowest protective level possible.

Are We Sampling Correctly?

In our blog post The Reality of Asbestos Clearance Air Sampling! Are You Sampling Enough? and our article in Healthy Buildings "You Can't Handle The Truth....About Clearance Sampling."  The major points from these articles were:

• Many believe or have been misled to believe that PCM sampling is the same as TEM sampling in terms of sampling volume.  This is not the case.  A PCM sample volume meeting AHERA clearance requirements are not at 1200 liters.  To do so is outside of the NIOSH 7400 method requirements for this purpose.  Even others have used the limit of detection sample volume to collect 560 liters.  
• In the NIOSH 7400 method, the issue regarding "relatively clean" environments" is addressed on page 4, number 4, note number 1 which states  "In relatively clean atmospheres, where targeted fiber concentrations are much less than 0.1 f/cc, use larger sample volumes (3000 to 10,000 liters) to achieve quantifiable loadings."
• Even though the formula calculates that 3,850 liters of air should be collected, many people use note 1 to collect 3,000 liters of air for clearance.  Either way clearance samples should be collected using no less than 3,000 liters of air as the minimum allowed for the NIOSH 7400 method requirements and AHERA compliance. 

Airbox Calibration Setup

In New York State the recommended sampling volume is 1,200 liters of air (based on the NYSDOH ELAP and the Bureau of Occupational Health and the New York State Department of Labor (NYSDOL) FAQ#13) and in the New York City Department of Environmental Protection (NYCDEP) Title 15 the required sampling volume is 1,800 liters of air for PCM clearance.  Based on the LOQ formula what are the consequences of not collecting the required volume?  Remember this is a formula and if you modify the formula to solve for L instead of t.  You then plug in the amount of time you're actually sampling for then you get the actual result you are achieving.

The NIOSH 7400 method, utilizes the formula above to determine the amount of time needed to achieve the fiber density, E, for optimum filter loading.  So, the minimum density the method allows is 100 fibers per square millimeter (mm²).  The Ac is the collection area for a 25-mm cassette which is 385 mm².  The Q is the sampling flow rate in LPM, and t is the time we are collecting the sample.  Modifying the formula to calculate for L or the LOQ concentration, we get this for 560 liters.

When using 1200 liters we get the following:

When using 1800 liters we get the following:

The consequences of the above numbers are that the:

• EPA AHERA clearance requirement of less than or equal to 0.01 f/cc is not being met. 
• NYSDOL Industrial Code Rule 56 (ICR56) clearance requirement of less than 0.01 f/cc is not being met.
• NYCDEP Title 15 clearance requirement of less than 0.01 f/cc is not being met

According to the RAC, the risk of excess lifetime cancer risks is 25 cases per 100,000 exposed at 0.02 f/cc and somewhere between 25 and 65 cases per 100,000 exposed at 0.03 f/cc.

At the 2024 Environmental Information Association (EIA) National Conference & Exhibition we conducted a survey of the attendees regarding the volume of air they collected for PCM clearance.  Below are the results:

As you can see from the results none of the individuals that answered the question are actually collecting the correct volume of air required by the NIOSH 7400 methodology.  Improper collection of PCM samples is not meeting the clearance requirements.

The Cost of Clearance Sampling

We know what you are going to say TEM samples cost way more than PCM samples.  We agree they do, but not compared to when AHERA first came out.  When AHERA first came out there were hardly any laboratories that did TEM analysis and those that did the samples cost between $350-500 per sample.  The difference between PCM analysis costs and TEM analysis costs has come way down.  A recent quote we received from a reputable laboratory for PCM analysis with a 3-hour turnaround was $12.50 per sample while TEM AHERA analysis with a 4-hour turnaround was $150 per sample.  The price difference is smaller than it once was. The odd math is that the difference in price between PCM and TEM for many projects is not even a rounding error to the overall budget, where the total construction budget could be in the millions (renovations). 

If PCM cannot see the fibers that cause disease or even determine that the area is clean, is it worth the money or the paper it is printed on when it comes to final clearance air sampling? 

TEM should be the only method employed for clearance air sampling!