Minnesota Administrative Rules
Agency 144 - Health Department
Chapter 4620 - CLEAN INDOOR AIR
ASBESTOS ABATEMENT
Part 4620.3598 - TRANSMISSION ELECTRON MICROSCOPY
Universal Citation: MN Rules 4620.3598
Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1. Use of alternative clearance standard.
When the alternative clearance standard is used, items A and B apply.
A. The transmission electron
microscopy method for air monitoring sample collection and analysis must comply
with Code of Federal Regulations, title 40, chapter I, subchapter R, part 763,
subpart E, appendix A, section II, amended through October 30, 1987.
B. The volume of air drawn through a
25-millimeter filter cassette must be equal to or greater than 1,200 liters.
The volume of air drawn through a 37-millimeter filter cassette must be greater
than or equal to 2,800 liters. Both types of filter cassettes must contain a
sample filter that has a pore size of 0.8 microns or smaller.
Subp. 2. Air monitoring sample analysis.
Alternative clearance air monitoring samples analyzed by transmission electron microscopy must be analyzed by a laboratory accredited by the United States National Institute of Standards and Technology National Voluntary Laboratory Accreditation Program (NVLAP) for analysis of samples by transmission electron microscopy.
Statutory Authority: MS s 144.05; 326.70 to 326.81
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