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.

Chrysotile Asbestos Banned? More Like Certain Conditions of Use Will Be Eventually Banned!

Many of you, as did I, read about the "Ban of Chrysotile Asbestos" and rejoiced over something long overdue.  However, after reading this so-called ban it is obvious that it is not a ban.  Just reading the title of the rule tells you it is not a ban. "Asbestos Part 1 - Chrysotile Asbestos; Regulation of Certain Conditions of Use Under the Toxic Substances Control Act (TSCA)".  This rule is only regulating "certain conditions of use".  We would say the media needs a dictionary if they actually think after reading the title this is a ban.  What is the definition of a ban?  Ban is to prohibit or forbid especially by legal means (as by statute or order).  After reading the rule, it is obvious this is not banning all uses of chrysotile asbestos, but banning or restricting its use in very specific industries.  In addition, what about the other types of asbestos: amosite, crocidolite, tremolite, anthophyllite, actinolite, or the Libby amphiboles?  No mention of these there!

Since this is not a ban and 40,000 Americans die annually from asbestos-caused diseases it is even more important that we Tell Congress to Ban Asbestos!  The Asbestos Disease Awareness Organization (ADAO) has developed a coalition of firefighters, public health, and safety officials who are calling on the public’s support in their decades-long fight to convince the U.S. Congress to ban deadly asbestos.  Now, you have an opportunity to write your own message to US Senators and US Representatives to ask them to support the Alan Reinstein Ban Asbestos Now Act (ARBAN). This act would prohibit the manufacture, processing, use, and distribution of commercial asbestos in commerce - a known carcinogen that is still widely in use across the U.S. Make your voice heard on this link. It takes only a minute.

Chrysotile Asbestos

Before we go into this rule, let's remember we still have the Significant New Use Rule (SNUR) that came out on April 25, 2019.  This rule did not ban any forms of asbestos but allowed manufacturers (including importing), or processors of asbestos (including as part of an article) to seek permission from the Environmental Protection Agency (EPA) for the significant new use (it included a list of uses that would need permission).

The final rule can be found on EPA's website here.  The document consists of 40 pages (pages 21970 to 22010).  However, the rule is found on page 22005 (35 pages after the beginning of the document, meaning the rule consists of only 5 pages).  Subpart F - Chrysotile Asbestos starts with the different Sections of the Rule:

• 751.501 General
• 751.503 Definitions
• 751.505 Manufacturing, processing and commercial use of chrysotile asbestos diaphragms in the chlor-alkali industry. 
• 751.507 Certification of compliance for the chlor-alkali industry. 
• 751.509 Other prohibitions and restrictions of the manufacturing, processing and commercial use of chrysotile asbestos. 
• 751.511 Interim workplace controls of asbestos exposures. 
• 751.513 Disposal. 
• 751.515 Recordkeeping. 

As you can see from this list, these are the Certain Conditions of Use.  Let's look at 751.505 diaphragms (means semipermeable diaphragms, which separate the anode from the cathode chemicals in the production of chlorine and sodium hydroxide (caustic soda).  

• Section (a) states, after May 28, 2024, all persons are prohibited from manufacture (including import) of chrysotile asbestos, including any chrysotile asbestos-containing products or articles, for diaphragms in the chlor-alkali industry.  

That is a ban on the import of chrysotile asbestos, but only for diaphragms, however, the next section is on the use of diaphragms containing chrysotile asbestos, 

• Section (b) states, after May 28, 2029, all persons are prohibited from processing, distribution in commerce, and commercial use of chrysotile asbestos, including any chrysotile asbestos-containing products or articles, for diaphragms in the chlor- alkali industry, except as provided in paragraphs (c) through (d) of this section. 

Here is the devil in the details:

• Section (c) Any person who meets all of the criteria of this paragraph (c) may process, distribute in commerce and commercially use chrysotile asbestos, including any chrysotile asbestos- containing products or articles, for diaphragms in the chlor-alkali industry at no more than two facilities until May 25, 2032: (1) On May 28, 2024, the person owns or operates more than one facility that uses chrysotile asbestos in chlor-alkali production; (2) The person is converting more than one facility that the person owns or operates that as of May 28, 2024 uses chrysotile asbestos in chlor-alkali production from the use of chrysotile asbestos diaphragms to non-chrysotile asbestos membrane technology, and by May 28, 2029, the person has ceased all processing, distribution in commerce and commercial use of chrysotile asbestos at one (or more) facility undergoing or that has undergone conversion to non-chrysotile asbestos membrane technology; and (3) The person certifies to EPA compliance with the provisions of this paragraph, in accordance with §751.507. 
• (d) Any person who meets all of the criteria of this paragraph (d) may process, distribute in commerce and commercially use chrysotile asbestos, including any chrysotile asbestos- containing products or articles, for diaphragms in the chlor-alkali industry at not more than one facility until May 26, 2036: (1) On May 28, 2024, the person owns or operates more than two facilities that use chrysotile asbestos in chlor-alkali production; and (2) The person is converting more than two facilities that the person owns or operates that as of May 28, 2024 use chrysotile asbestos in chlor-alkali production from the use of chrysotile asbestos diaphragms to non-chrysotile asbestos membrane technology: (i) By May 28, 2029, the person has ceased all processing, distribution in commerce and commercial use of chrysotile asbestos at one (or more) facility undergoing or that has undergone such conversion; and (ii) By May 25, 2032 the person has ceased all processing, distribution in commerce and commercial use of chrysotile asbestos at two (or more) facilities undergoing or that have undergone conversion to non-chrysotile asbestos membrane technology; and (3) The person certifies to EPA compliance with the provisions of this paragraph, in accordance with §751.507. 

So other words we have a ban on the manufacture/importing of chrysotile asbestos to make diaphragms but the use of chrysotile asbestos diaphragms is not banned until 2036.  In addition, 751.509  Other prohibitions and restrictions of the manufacturing, processing, and commercial use of chrysotile asbestos covers:

• Prohibit the manufacture (including import), processing, use, distribution in commerce and commercial use of chrysotile asbestos, including any chrysotile asbestos-containing products or articles, for sheet gaskets in chemical production and require interim workplace controls for certain commercial uses after May 27, 2026.  With exceptions for titanium dioxide production until May 28, 2029, and processing nuclear material at the Savannah River Site until December 31, 2037. 
• Prohibit the manufacture (including import), processing, distribution in commerce, and commercial use of chrysotile asbestos, including any chrysotile asbestos-containing products or articles, for oilfield brake blocks, aftermarket automotive brakes, and linings, other vehicle friction products, and other gaskets after November 25, 2024; 
• Prohibit the manufacture (including import), processing, and distribution in commerce of chrysotile asbestos, including any chrysotile asbestos-containing products or articles, for consumer use of aftermarket automotive brakes and linings and other gaskets after November 25, 2024.
• All of these have exceptions to the distribution in commerce prohibition if they are already installed.

https://www.asbestos.com/occupations/auto-mechanics/

Section 751.511 Interim workplace controls of asbestos exposures is an interesting section considering it's stepping on the toes of the Occupational Safety and Health Administration (OSHA).  This section applies to the processing, and commercial use of chrysotile asbestos, including any chrysotile asbestos-containing products or articles, for chrysotile asbestos diaphragms in the chlor-alkali industry; and to the commercial use of chrysotile asbestos sheet gaskets for titanium dioxide production.   The section establishes an exposure limit called the Interim Existing Chemical Exposure Limit (ECEL):

• 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).  Remember the OSHA Permissible Exposure Limit for asbestos is 0.1 f/cc as an 8-hour time weighted average.  The ECEL is a 20 times reduction from the PEL.
• Requires initial (performed as of May 28, 2024, and no later than November 25, 2024) & periodic exposure monitoring (performed within three months or six months based on previous results).
• Method of Monitoring utilizes OSHA 1910.1001 Appendix A, OSHA method ID-160, or the National Institute of Occupational Safety and Health (NIOSH) 7400 method.  Allowance for the NIOSH 7402 method to adjust the analytical result to include only chrysotile asbestos. 

Personal Sampling Pump

The section also includes additional requirements for exposure monitoring, establishing regulated areas, exposure control procedures, respiratory protection, and workplace information and training.  The respirator section makes for interesting reading for those who know the OSHA respiratory protection standard.  Below are some examples of the respirator requirements:

• If exposure monitoring indicates the exposure is above 0.00view 5 f/cc and less than or equal to 0.05 f/cc.  The employer must provide either a half-mask supplied air (SAR) or airline respirator operated in demand mode or a half-mask self-contained breathing apparatus (SCBA) respirator operated in demand mode.
• If exposure monitoring indicates the exposure is above 0.05 f/cc and less than or equal to 0.125 f/cc.  The employer must provide a loose-fitting facepiece supplied air (SAR) or airline respirator operated in continuous flow mode.

Supplied airline respirator

It is obvious from these respirator selections EPA is reaffirming that there is no safe exposure level to asbestos.  For those of us who remember the EPA's and NIOSH's White Book "A Guide to Respiratory Protection for the Asbestos Abatement Industry", remember that this quote was in that book:

"Respirators which use filters to remove contaminants from the air do not provide as high a degree of protection for workers as respirators which supply clean pressurized air to the workers from a protected source."

Realize these restrictions are stricter than OSHA requirements and we wonder what this means for Part 2 of this evaluation process when EPA will be looking at Legacy issues?

Related articles

• The National Law Review - EPA Bans Ongoing Uses of Asbestos https://www.natlawreview.com/article/epa-bans-ongoing-uses-asbestos
• ADAO's FAQs and Quotes on EPA Part 1 Chrysotile Asbestos Rule
   https://www.asbestosdiseaseawareness.org/newsroom/blogs/faqs-and-quotes-on-epa-part-1-chrysotile-asbestos-rule/

The Reality of Asbestos Clearance Air Sampling! Are You Sampling Enough?

We attended the Environmental Information Association (EIA) 2022 National Conference and Exhibition in Phoenix, Arizona from March 20, through March 23, 2022.  We attended several sessions regarding asbestos where we discussed with some attendees asbestos clearance air sampling and what are the Federal requirements.  Based on those discussions we figured it was time to write an article on this topic.  To make sure we wrote this article based on general industry practice, versus what we are used to in New York State and New York City, we consulted with Mr. Tom Laubenthal, of TGL Consulting, Inc., and Mr. Dana Brown, of Time's Dark Captains.  Since everything else seems to start with the Environmental Protection Agency's (EPA's) Asbestos-Containing Materials in Schools Rule (40 CFR Part 763, Subpart E, known in the industry as the Asbestos Hazard Emergency Response Act (AHERA)) why don't we start there?  The AHERA regulation remember applies to schools from Kindergarten to 12th grade (K-12), both public and private schools.  The requirements 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

For all intents and purposes, these methods serve as the industry standard when final clearance is performed for most asbestos abatement projects, especially when areas are to be re-occupied. We’ll discuss applicability issues as we go. 

TEM Analysis

First, let's discuss the requirement for aggressive clearance sampling.  In the AHERA regulation, aggressive sampling means floors, ceilings, and walls shall be swept with the exhaust of a minimum one (1) horsepower leaf blower.  Some states and specifications may also require the use of fans as described in the non-mandatory section of Appendix A.  The non-mandatory section states, that stationary fans shall be placed in locations that will not interfere with the air monitoring equipment.  Fan air is directed toward the ceiling.  One fan shall be used for every 10,000 cubic feet (CF) of a worksite.  This is required in the New York State Department of Labor's Asbestos Regulation Industrial Code Rule 56 (NYSDOL ICR56) and the New York City Department of Environmental Protection Asbestos Regulation Title 15 (NYCDEP Title 15).  However, NYSDOL ICR56 also requires one fan per room in addition to the one fan per 10,000 CF.

This is not in the spirit of the AHERA/NYSDOL ICR56/NYCDEP Title 15 requirements for aggressive clearance sampling. Thank you Greg Mance for the photo.

As defined by the AHERA rules, final clearance air sampling can 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).

Graphic courtesy Tom Laubenthal

There are some similarities between the AHERA TEM and NIOSH 7400 methods.  For example, the AHERA TEM method (Appendix A) allows for the use of either a 25-millimeter (mm) filter cassette or a 37-mm filter cassette.  We haven't used a 37-mm cassette since the industry switched from the old asbestos sampling method NIOSH P&CAM 239 to the NIOSH 7400 method that was formally adopted into AHERA.  For sampling, whether it is the AHERA TEM method or the NIOSH 7400 method, we use a 25-mm 3-piece cassette with 50-mm electrically conductive extension cowl cassettes.  The two methods require the filter cassette to face 45 degrees downward from the horizontal.  The filter material used is mixed cellulose ester (MCE).  AHERA TEM method does allow for the use of polycarbonate (PC) filters as well.  The PC filters fell out of favor because post-sampling handling was more problematic than the MCE filters.  With PC filters, if samples sent to the lab are not handled carefully, the sampled fibers can move significantly from the filter surface.  This was widely discussed in the industry in the 1980s.  Since then, only MCE filters are used outside of specialty applications. 

The filter cassette is to face 45 degrees downward from the horizontal.

Both methods require blanks, however, that is where the similarities end.  The AHERA TEM method requires three blanks two field blanks and one laboratory (sealed) blank.  While the NIOSH 7400 method requires a minimum of two blanks or 10% of samples collected with a maximum of 10 blanks.  How the blanks are handled is different as well. The AHERA TEM method laboratory (sealed) blank is not opened and kept sealed, while the field blanks are opened for 30 seconds at the entrance to each abatement area and one at an ambient area.  While the NIOSH 7400 method requires the blanks to be opened at the same time as the other cassettes just prior to sampling and stored with the top covers of the cassettes that are running and remain open for the duration of sampling (here is an interesting difference, in some places the cassettes are stored in the box with the lid closed or, the way we were taught, they are placed in a Ziploc bag that is used to deliver the samples to the laboratory).  

A typical box of air sampling cassettes

Another difference is that with the AHERA TEM method we use a 0.45-micron (µm) MCE filter and the NIOSH 7400 method uses a 0.8 µm MCE filter.  This refers to the size of the air passages in the filter material. Filter manufacturers will color code or mark the label so that the type of filter within the cassette assembly is known to the user and the laboratory.

TEM filter is 0.45-micron.  PCM filter is 0.8-micron.

Let's get to some of the interesting items such as how the samples are taken and how many are required.  The AHERA TEM method is straightforward, it requires 5 samples inside the work area and 5 samples outside the work area that represent air entering the abatement site plus the blanks (as mentioned above) for a total of 13 samples.  These samples should run from 1 to less than 10 liters per minute (LPM) for a total volume of air greater than 1199 liters or greater (see Table 1 below for the recommended sampling volume range for this method, typically the volume range is between 1200 liters and 1800 liters).  It is interesting that the maximum flow rate is less than 10 LPM.  It would be interesting to find out how many in the industry actually sample at less than 10 LPM (i.e., 9.9 LPM versus 10 LPM).  Likely most of the industry merely samples at 10 LPM.  The statistical difference between 10 and 9.9 LPM, some regulators insist upon, is statistically insignificant and will affect method performance in no discernable manner.  Either way, this means your clearance samples will take a little over 2 hours to collect.  

In speaking with Mr. Tom Laubenthal, we learned at the time this method was developed it became known through the research involved that flow rates higher than 10 LPM could cause fibers to impact the MCE filters vertically and not horizontally to the filter surface.  This makes the sample analysis, counting, and identification, difficult and likely biased.  This is also the reason the method specifies a second MCE filter under the 0.45 µm sampling filter and the 5 µm diffuser. This additional filter is placed in this manner to attempt to create an even flow across the filter surface so that fibers impact the filter uniformly.  Since the fibers are lying flat on the filter this is the reason for turning the sample upright before interrupting the pump flow to ensure the fibers remain on the filter.

Sampling Cassette Configuration

In the AHERA TEM method, the clearance samples pass when the average concentration of the five samples inside the work area does not exceed 70 structures per square millimeter (s/mm²).  See AHERA at 763.90 (i) (3) for an optional clearance test based on the z-test which compares the outside and inside air samples.  This is rarely necessary.  But cases have occurred when contamination can exist in the air outside the work area that could cause a failure in the work area.

This TEM asbestos image is from the Centers for Disease Control (CDC) "Asbestos Fibers and Other Elongate Mineral Particles: State of the Science and Roadmap for Research"

The NIOSH 7400 method for final clearance is also interesting when it comes to how the sample is taken and how many are based on the project.  For schools, when PCM is allowed, it's 5 samples inside the work area.  What's interesting is that the clearance is based on each sample and 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).  Well according to the NIOSH 7400 method how do you achieve clearance at that LOQ?  This concept of LOQ is not a concept understood by many that use the NIOSH 7400 method for all its purposes.  In the NIOSH 7400 method, this issue is addressed as follows in the section "Sampling", number 4 on page 4.  It utilizes the formula below 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, so let's say that is 16 (the maximum flow rate allowed by the method).  The L is the concentration of fibers in the air, we are looking to achieve clearance at 0.01 fibers/cubic centimeters (f/cc).  So if you plug these numbers into the formula you get a time of 240.6 minutes, which means the sample would have to run for a little over 4 hours at 16 liters per minute (total volume of air of 3,850 liters).

Realize that is running the sample at 16 LPM.  If your pump/flowmeter can only go to 15 LPM then you would have to run the sample for 256.7 minutes which is just short of 4 hours and 15 minutes.  The lower the flow rate, the longer time it will take to meet sample volume requirements. 

Airbox High-Performance Air Sampler

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.  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. 

PCM image of fibers

The true problem is the NIOSH 7400 was never designed as a clearance tool, it was designed as a personal air sampling method.  NIOSH and the Occupational Health and Safety Administration (OSHA) still view the method in that manner officially.  The other problem with PCM is that all fibers meeting method criteria are counted, not just asbestos fibers.  The AHERA TEM method is the only procedure that was designed as a final clearance air sampling method. Only asbestos fibers/structures are counted in the analysis meeting method criteria for size, and those much smaller than can be determined by the PCM.

 

EPA's Silver Book

Realize this is not something out of the ordinary the EPA's publication "Measuring Airborne Asbestos Following An Abatement Action" (otherwise known as the Silver Book) written in November 1985 on page 2-6 recommends the sample volume for the PCM analysis should be a minimum of 3,000 liters of air (though at the time of this publication it was describing the NIOSH P&CAM 239 PCM methodology).  In addition, in March 2015 the EIA published a revision to the EPA's 1985 document "Guidance for Controlling Asbestos-Containing Materials in Buildings"(EPA 560/5-85-024, known as the Purple Book).  This nationally peer-reviewed document was re-titled "Managing Asbestos in Buildings: A Guide for Owners and Managers."  Chapter 5 (on page 88) says the minimum sampling volume of 3,000 liters of air for samples taken to meet the NIOSH 7400 method requirements for LOQ sampling.  Mr. Dana Brown did a video regarding the LOQ issue and why NIOSH 7400 method is not the best choice for clearance, you can see it below. 

This doesn't count that we have called for the AHERA TEM method to be utilized for asbestos-containing floor tiles and mastic removals based on our previous blog post "Asbestos Floor Tile Debate", published in the August 2017 issue of Healthy Indoors Magazine, which found that the NIOSH 7400 method is not able to analyze the type of fibers (Grade 7-Shorts and Floats that are known to be less than 5 microns) found in these materials because of the known small fiber sizes generated by floor tile work.  Whether AHERA-based work or asbestos abatement where re-occupancy will occur, the surest way to make sure an area is ready to be given back to the public to be free of asbestos as practicable by current methods, and the fastest method for clearance would be the AHERA TEM method.  

NYSDOL ICR56 Definition of an Asbestos Project

Of course, those of you who work in New York State or New York City realize these requirements only apply to public and private K-12 schools.  So they don't apply to other buildings, or do they?  First, let's take the NYSDOL ICR56 Subpart 56-4, page 35 is the air sampling requirements.  56-4.6 "Test Methods" on page 36 says "the same NIOSH approved methodology for project air sampling and for analysis of the air samples shall be used at all phases of an asbestos project that require area air sampling and analysis, with the possible exception of clearance air sampling."  This means that the NIOSH 7400 method must be followed for all phases except clearance (Phase IIC of the asbestos project) this allows you to use either the NIOSH 7400 method or the AHERA TEM method instead for clearance.  So this means you have to follow the NIOSH 7400 method's LOQ requirements for all phases (Phase I B and Phase II A, B, & C) of the asbestos project.  In addition, the NYSDOL ICR56 regulation for clearance is less than 0.01 f/cc so that changes the formula again.  Let's use 0.009 f/cc for the L instead and still use 16 liters per minute, well that means the sample has to run for 267 minutes, almost 4 hours, and 30 minutes (a total volume of air of 4,278 liters).

The consummate leader cultivates the moral law, and strictly adheres to method and discipline; thus it is in his power to control success. ~ Sun Tzu

So why does everyone sample 1,200 liters of air for all samples?  On April 8, 2011, the New York State Department of Health (NYSDOH) Wadsworth Center issued frequently asked questions (FAQs) regarding asbestos/fibers analysis that were developed through the collaboration of the NYSDOH Environmental Laboratory Approval Program (ELAP) and the Bureau of Occupational Health and the NYSDOL.  In this FAQ is FAQ#13: What is the minimum sampling volume to be collected for air sampling associated with (a) post-abatement (clearance) air monitoring and (b) post-abatement area monitoring for PCM analysis?  The answer that was given was:  Within the upcoming revision to NYS Industrial Code Rule 56, minimum air sample volume requirements 

are being added for both background and clearance PCM air samples. The minimum volume will be 1,200 liters for all background and clearance PCM air samples collected.  Hopefully, you all see the problem here...the code rule has not been revised to include this requirement, and even if it did change this is a minimum volume of air and does not comply with the NIOSH 7400 method requirement.

Buy our Asbestos Air Sampling Chart here.
Read about our Asbestos Air Sampling Charts here.

Next up is the NYCDEP Title 15.  NYCDEP Title 15 was just updated on May 28th, 2022.  See our blog post "New York City's Asbestos Regulation Revised, Again!" for more information on the changes.  However, these changes did not make any significant changes to what we are discussing.  Under Subpart D, 1-37 (b) "Area air sampling equipment for PCM shall be utilized in accordance with the sampling procedures specified within the NIOSH 7400 Method modified for area sampling."  Again, it means you must follow the LOQ requirements in the NIOSH 7400 method, even though NYCDEP Title 15 does give you minimum sample volumes.  For clearance by NIOSH 7400 method, it's 1800 liters and for the AHERA TEM method, it's 1250 liters.  Remember these are minimums.  In addition, NYCDEP Title 15 limits the flow rate to a maximum of 15 liters per minute.  This means to achieve the LOQ requirement it would take 256.7 minutes which is just short of 4 hours and 15 minutes (total volume of air of 3,850 liters).  The NYCDEP Title 15 minimum volume would not meet the LOQ requirements in the NIOSH 7400 method.  We hope this post has helped to resolve those pesky questions regarding clearance and convince you that probably the best air sampling method for clearance is the AHERA TEM method! 

AHERA Bulk Sampling Rules and Other Requirements that Apply to Asbestos Surveys.

In 2008, the Environmental Protection Agency (EPA) responded to a question by the New York State Department of Labor (NYSDOL) regarding the minimum number of bulk samples required for suspect asbestos-containing miscellaneous materials (see our blog post dated 6/24/08 and rebooted 07/09/22). This clarification determined that the minimum number of samples is two (2) samples for each suspect homogeneous miscellaneous materials.  This clarification was determined based on a review of the EPA's Asbestos Hazard Emergency Response Act (AHERA) section 763.86 -Sampling. This section of the AHERA regulation is used by asbestos inspectors to determine the number of samples to take for each homogeneous area.  However, it is important to remember when sampling joint compound and add-on material (which are miscellaneous materials) that EPA's "Sampling Bulletin 093094", requires 3 samples per homogeneous area for joint compound and 3 samples per homogeneous area of add-on material.

The core of all asbestos inspections is the determination of the type of material (surfacing material, thermal system insulation, or miscellaneous material) and whether the materials are homogeneous. A homogeneous area is defined as a type of material that is uniform in color and texture (as per 763.83). Once the type of material is determined and the material is classified as a homogeneous area, then the number of samples for each area is determined.

If the suspect asbestos material is a surfacing material, the square feet of the homogeneous area is determined which provides the inspector with the minimum number of samples that shall be taken. If the homogeneous area is less than 1,000 square feet, the inspector shall take 3 samples. If the area is between 1,000 and 5,000 square feet, the inspector shall take 5 samples. When the area is over 5,000 square feet, the inspector shall take 7 samples. This is sometimes known in the industry as the 3-5-7 rule.  In addition, EPA also published "Asbestos in Buildings: Simplified Sampling Scheme for Friable Surfacing Materials," otherwise known as the "Pink Book."  This document not only describes the process for random sampling but also recommends that for surfacing materials the number of samples should be 9 per homogeneous area no matter the number of square feet.

Should the suspect asbestos material be classified as thermal system insulation then the inspector must determine if the material is a homogeneous area, a patch material, or a cement or plaster used on fittings (tees, elbows, or valves). Homogeneous areas of thermal system insulations shall require 3 samples, while each homogeneous area of patch material less than 6 linear feet or 6 square feet shall require only 1 sample. Cement or plaster used on fittings shall be sampled based on each insulated mechanical system (hot water, cold water, steam, chilled water, etc.) and shall require a minimum of 2 samples to  be taken.  In addition, EPA strongly recommends that at least three samples be taken in large homogeneous areas, even when the regulations do not require it.  This recommendation was published in EPA's 700/B-92/001 A Guide To Performing Reinspections Under AHERA.

Some general rules to remember when taking bulk samples is sampling should be taken in a randomly distributed manner, samples cannot be composited, and shall be submitted to laboratories accredited by the National Voluntary Laboratory Accreditation Program (NVLAP) and, in New York State, approved New York State Department of Health Environmental Laboratory Approval Program (NYSDOH ELAP).  Asbestos Inspectors determine a homogeneous area contains asbestos when one of the required numbers of samples contains asbestos in the amount greater than 1%. Should all the required samples taken in a homogeneous area result in asbestos amounts less than or equal to 1%, then the area does not contain asbestos as per EPA. However, you must make sure your client is aware that under the Occupational Safety and Health Administration (OSHA) regulation 1926.1101 these materials are still regulated as asbestos and there are specific requirements under the OSHA regulation on handling these materials, see OSHA's standard interpretation letter dated November 24, 2003.  

As Asbestos Inspectors we should also remember that the American Society of Testing and Materials (ASTM) has a Standard Practice for Comprehensive Asbestos Survey ASTM E2356-18.  This standard practice has also been approved by EPA as the method for performing asbestos surveys for the purposes of complying with the National Emissions Standards for Hazardous Air Pollutants (NESHAPS) regulation.  That regulation requires a "thorough inspection" of the facility for asbestos and EPA expects an owner/operator to follow the steps described in Sections 1 through 5 and section 8 (the pre-construction survey) in the ASTM standard.  Being an Asbestos Inspector and performing an asbestos survey is not an easy task.  There are a lot of different documents that you have to have knowledge about to be able to perform your task and then on top of that you must have knowledge regarding where asbestos was used in building materials.

EPA Clarifies Miscellaneous Materials Sampling - RePublished

Over the past several months in the asbestos refresher classes, we have been talking about the clarification letter that the Professional Abatement Contractors of New York (PACNY) sent to all asbestos contractors and consultants back in November 2007. This letter detailed clarification from the Environmental Protection Agency (EPA) under the Asbestos Hazard Emergency Response Act (AHERA) regulation to a question from Mr. Christopher Alonge of the New York State Department of Labor (NYSDOL) regarding the minimum number of samples that should be taken for miscellaneous materials. According to this clarification (follow the link above for the PACNY letter and clarification), the minimum number of samples that should be taken of miscellaneous materials (i.e., floor tiles, roofing, caulk, ceiling tiles) is two. The original AHERA section covering sampling of miscellaneous materials indicates that the word used in this part of the regulation is "samples" indicating more than one.

Realize this is only an issue if you took one sample of let's say floor tiles, and based on the result (remember floor tiles are analyzed utilizing the nonfriable organically bound material method of analysis, requiring final negative results to be analyzed by Transmission Electron Microscopy (TEM)) you said the floor tiles did not contain asbestos. The EPA clarification says that you needed another negative sample result to say the floor tiles did not contain asbestos. This issue obviously does not impact those of you who have been following our recommended procedure of taking at least three samples per homogeneous miscellaneous material. If you followed our recommendation you would have three negative results before declaring a miscellaneous material not asbestos-containing and would be in compliance with the clarification and the original regulation.

Worker's Memorial Day, Honoring Those Who Died On The Job. What About Those Who Died Because of Their Job?

Worker’s Memorial Day is dedicated to those who lost their lives on the job. Every year, on April 28, people across the country and around the world pay their respects to the thousands killed each year on the job and the millions more who suffer serious occupational injuries and illnesses on the job and recognize the impact these tragic losses have on families, co-workers, and communities.  According to Wikipedia, in 1989 the AFL-CIO declared April 28 Worker's Memorial Day.  April 28 is the day the Occupational Safety and Health Act of 1970, went into effect and the day the Occupational Safety and Health Administration (OSHA) was formed in 1971.  In 1991, the Canadian parliament passed an Act respecting a National Day of Mourning for persons killed or injured in the workplace, making April 28 an official Workers' Mourning Day.  In 2001 the International Labour Organization (ILO), part of the United Nations (UN), recognized Workers' Memorial Day and declared it World Day for Safety and Health at Work, and in 2002 the ILO announced that April 28 should be an official day in the UN system.

According to ADAO, over 10,000 people are dying from asbestos exposure each year! 

As we see all the events held and all the statements made this day one theme seems to repeat over and over, workplace injuries and illnesses remain unacceptably high, especially the ones that happen now!  Every theme is to reduce injuries, but very few if any mention the biggest killer occupational disease.  The Center for Construction Research and Training (CPWR) is one of the few organizations that even discusses occupational disease.  But don't look for asbestos exposure on that website, for example, the construction worker exposure control database that they manage only lists silica, noise, welding fumes, and lead.  What about asbestos, mercury, or polychlorinated biphenyls?  But you can find oodles of information on falls.  Let's look at OSHA and how they handle occupational diseases.  They are the prime regulatory agency for occupational diseases.  Secretary of Labor Marty Walsh, OSHA is one of the agencies under the Department of Labor, yesterday issued a statement on Workers Memorial Day it is much longer than the following excerpt, but this statement and what it, and the whole statement, is lacking makes my point:

 “In the past year, nearly 5,000 workers left home for work and did not return. None knew that going to work would cost them their lives. While each life lost is a tragedy, those taken in incidents that might have been prevented – had their employers followed required safety and health standards – are especially painful for their families, their co-workers and friends, and their communities."

No recognition for workers who died from their job, but died after they were no longer working, though in Secretary of Labor Marty Walsh's video presentation he mentions his father being exposed to asbestos and having lung problems. Even in the Department of Labor's video on the Worker Memorial Day Program, only Assistant Secretary for Labor Chris Williamson the director of the Mine Safety and Health Administration (MSHA) even mentions occupational diseases when he mentions silica. 

While in the United Kingdom (UK) a new permanent memorial commemorating the lives of all the people who died as a result of exposure to asbestos has been unveiled in Barking and Dagenham at a special remembrance ceremony yesterday on International Workers Memorial Day.  The AFL-CIO annually releases a report "Death on the Job: The Toll of Neglect" that details the current state of safety and health protections for America’s workers. The 31st edition of the report states:

"Workplace hazards kill and disable approximately 125,000 workers each year—4,764 from traumatic injuries, and an estimated 120,000 from occupational diseases. Job injury and illness numbers continue to be severe undercounts of the real problem."

This report indicates that occupational diseases are 24 times more likely to occur than traumatic injuries!  Realize we are not saying safety is not important, but considering asbestos, silica, and welding fume exposures are still going on, just to name a few what is being done for these workers!  On May 2-6, 2022 OSHA will sponsor a National Safety Stand-Down to Prevent Falls in Construction.  Fatalities caused by falls from elevation continue to be a leading cause of death for construction employees, accounting for 351 of the 1,008 construction fatalities recorded in 2020 (BLS data).  If occupational diseases are typically 24 times more likely, then we would argue that falls are not the leading cause of death in construction.  Why is there no stand-down day for these occupational diseases?  Except for heat illness or noise, there are no stand-down days for the rest of the occupational diseases.  According to  OSHA's statistics, from October 2020 to September 2021 OSHA performed 15 inspections related to the construction asbestos standard (1926.1101) for 80 citations while for the same period OSHA performed 5,325 inspections with 5,463 citations for the duty to have fall protection in the construction industry (1926.501).   

Linda Reinstein of ADAO and Angelo Garcia, III of FED at the PACNY Environmental Conference

There is one bright cloud regarding recognizing those workers who die related to asbestos exposure but because they died after their retirement.  The Asbestos Disease Awareness Organization (ADAO) is the largest independent asbestos victims’ organization in the United States. Founded in 2004 to give asbestos victims and concerned citizens a united voice, to raise public awareness about the dangers of asbestos exposure, and to work towards a global asbestos ban.  The ADAO sponsors an annual International Conference on Asbestos Awareness and Prevention, and has annually (this year is the 17th) lobbied the U.S. Senate to pass a resolution to designate April 1- 7 as "National Asbestos Awareness Week", which coincides with "Global Asbestos Awareness Week".  Linda Reinstein is one of the founding members of ADAO and has told her story regarding Alan's, her husband, exposure to asbestos.  It's these stories that don't make it into the injury and illness statistics.  These stories are the ones that are being left out on Worker's Memorial Day and we must do better!