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.

Asbestos Dust Sampling in New York State

In our recent asbestos inspector/designer classes we have been informing them about the New York State (NYS) requirements for dust/surface sampling.  Under NYS Department of Labor (NYSDOL) Industrial Code Rule 56, dust and debris are listed as suspect miscellaneous asbestos containing materials (ACM).  Meaning that if the building was built pre-1974, this debris and dust that is visually assessed by the inspector shall be treated and handled as ACM and shall be assumed ACM, until bulk sampling is done.  Well the question comes how do you bulk sample debris and dust?

Asbestos Inspector Initial Course

The best way is to collect the debris and dust by scraping it into a asbestos sample bag using a knife or a scraper.  This material could then be analyzed using NYS Department of Health (NYSDOH) Environmental Laboratory Accreditation Program (ELAP) method 198.1.  NYSDOH ELAP method 198.1 is the standard polarized light microscope method utilizing dispersion staining and point counting.  

Another popular method for collecting debris and dust samples is the American Society of Testing and Materials (ASTM) standard "D5755 - Microvaccum Sampling and Indirect Analysis of Dust by Transmission Electron Microscopy for Asbestos Structure Number Concentrations"  The D5755 method requires vacuuming a known surface area (100 squared centimeters is mentioned in the standard but it could be larger or smaller).  The vacuuming is done with a standard 25 or 37-millimeter air sampling cassette (the air sampling cassette should have a mixed cellulose ester (MCE) or polycarbonate (PC) filter membrane with a pore size less than or equal to 0.8 micron) and an air sampling pump.  A plastic tube should be attached to the inlet orifice to act as a nozzle and should be cut at a 45 degree angle.  The air sampling pump should be calibrated to run at 2 liters per minute.  The D5755 method incorporates a method of analysis for the sample, however, in NYS that method cannot be used.  According to the NYSDOH ELAP Frequently Asked Questions (FAQ) number 8, "all bulk samples collected must be analyzed by ELAP approved methodology at an ELAP accredited laboratory.  ASTM method D5755 ....... are not certified as ELAP approved methods of analysis."  The method of analysis that shall be used, especially if you want transmission electron microscope analysis, is NYSDOH ELAP method 198.4.  

SKC Catalog Photo

ASTM standard "D6480 - Standard Test Method for Wipe Sampling of Surfaces, Indirect Preparation, and Analysis for Asbestos Structure Number Concentration by Transmission Electron Microscopy" is another method for collecting debris and dust samples.  This method involves wiping a surface of a known area (100 squared centimeters is mentioned in the standard but it could be larger or smaller) with a wipe material (particle free, sealed edge, continuous filament cloth sampling medium such as a clean room wiper) to collect a sample.  See the video below by IAQTV for visual instructions on collecting this type of sample:

  

The D6480 method also incorporates a method of analysis for the sample, however, again in NYS that method cannot be used.  According to the NYSDOH ELAP Frequently Asked Questions (FAQ) number 8, "all bulk samples collected must be analyzed by ELAP approved methodology at an ELAP accredited laboratory.  ASTM method......and D6480 are not certified as ELAP approved methods of analysis."  The method of analysis that shall be used is NYSDOH ELAP method 198.4. 

The interesting part about this is, NYS ELAP approved laboratories should be advising asbestos inspectors they cannot use the ASTM methods of analysis.  However, we've heard of several times when this has not occurred.  According to the above information, an inspector should be getting results for the samples collected in percent by weight (%), which they can then use to compare with the Environmental Protection Agency's (EPA's) definition that an asbestos containing material contains greater than 1% of asbestos by weight.  If they use the ASTM methods they will get results of structures per square centimeter.  There is no government standard to compare these results to and be able to give a determination is the material asbestos containing or not.  However, that has not prevented individuals from determining that areas are contaminated, or that debris or dust is ACM.  This has cost owners thousands and millions of dollars to cleanup areas based on this analysis.  It is even more interesting to note that ASTM in the "Significance and Use" section states:

• This test method does not describe procedures or techniques required for the evaluation of the safety or habitability of buildings with asbestos-containing materials, or compliance with federal, state, or local regulations or statutes.....
• At present, a single direct relationship between asbestos sampled from a surface and potential human exposure does not exist.....

When using the two ASTM methods, an inspector must be very careful in collecting the samples and interpreting the data that you get from these methods.  Experience and knowledge are key.

  

Asbestos Discovered In Current Building Materials

Based on testing done by the Asbestos Disease Awareness Organizations (ADAO) and announced at a press conference on November 28, 2007 it appears there may be a concern that new building materials may contain asbestos. The ADAO conducted asbestos testing on over 250 different household products utilizing Polarized Light Microscopy (PLM) and Transmission Electron Microscopy (TEM) analysis in accordance with the Environmental Protection Agency's test method 600/R-93/116. The link above gives you the detail of the methodology and results of the testing that included positive results for 5 products including Planet Toys "CSI Fingerprint Examination Kit", DAP "33" window glazing and "Crack Shot" spackling paste, Gardner Leak Stopper roof patch (which listed asbestos as an ingredient on the label), and Scotch High Performance Duct Tape.

Of the 5 products found to contain asbestos, 3 products are materials that are considered building materials. The window glazing, the spackling paste, and the roof patch are all materials that an asbestos inspector would sample to determine if these materials contained asbestos in a building built before 1980, but would ignore in a building built after 1980. The results from the ADAO testing found the window glazing contained 2.73% chrysotile and tremolite asbestos, the spackling paste contained 1.05% tremolite, anthophyllite, and chrysotile asbestos and the roof patch contained 15% chrysotile asbestos. All of these materials would be considered asbestos containing materials for an asbestos inspector, if they were sampled. Again, based on the typical opinion of the industry we wouldn't sample these materials after 1980. In fact, New York State uses a cut-off date of 1974.

This new information from the ADAO, obviously calls into question New York State's cut off date of 1974. If the above products still contain asbestos today, it probably means these products had asbestos in them between today and 1974 or 1980. As an Asbestos Inspector this information calls into question our assumption regarding the asbestos content of building materials in buildings after 1974. Since asbestos has not been banned, and it can still be found in building materials we are presently installing, this means we can no longer use the 1974 or 1980 date to determine whether building materials do or do not contain asbestos. This is one of the many reasons why ADAO has been lobbying for a complete ban on the manufacturer and the use of asbestos.

It is important to remember that though the New York State Industrial Code Rule 56 asbestos regulation does not regulate the assumption of asbestos in building materials after 1974, it does regulate the remediation of asbestos no matter the date of the building.