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NYC 9/11 Public Portal Document

ASBESTOS and OTHER FIBERS by PCM: METHOD 7400, Issue 2, dated 15 August 1994 - Page 11 of 15

The curves in Figures 1 are defined by the following equations:

UCL 2X 2.26 4^ ((2.25 2 Xf - 4 ( 1 - 2.25 S,^) X^''” (3) 2(1 2.25 S,^)

LCL ° 2 X * 4 - [(4 2X - 4 ( 1 - 4 S,^ ) (4) 2(1 -48,“')

where = subjective interlaboratory relative standard deviation, which is close to the total interlaboratory S when approximately 100 fibers are counted. X = total fibers counted on sample LCL = lower 95% confidence limit. UCL = upper 95% confidence limit. Note that the range between these two limits represents 90% of the total range.

REFERENCES:

[1] Leidel, N. A., S. G. Bayer, R. D. Zumwalde, and K. A. Busch. USPHS/NIOSH Membrane Filter Method for Evaluating Airborne Asbestos Fibers, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 79-127 (1979). [2] Baron, P. A. and G. C. Pickford. "An Asbestos Sample Filter Clearing Procedure," Appl. Ind. Hyg., 1:169-171, 199 (1986). [3] Occupational Safety and Health Administration, U.S. Department of Labor, Occupational Exposure to Asbestos, Tremolite, Anthophyllite, and Actinolite Asbestos; Final Rules, 29 CFR Part 1910.1001 Amended June 20, 1986. [4] Rooker, S. J., N. P. Vaughn, and J. M. LeGuen. "On the Visibility of Fibers by Phase Contrast Microscopy," AmSE. Ind. Hyg. Assoc. J., 43, 505-515 (1982). [5] Baron, P. and G. Deye, "Electrostatic Effects in Asbestos Sampling," Parts 1 and II Amer, Ini. Hyg^ Assoc, J.. SI. 51-69 (1990). [6] Johnston, A. M., A. D. Jones, and J. H. Vincent. "The influence of External Aerodynamic Factors on the Measurement of the Airborne Concentration of Asbestos Fibers by the Membrane Filter Method," Ana. Occuo. Hyg.. 25, 309-316 (1982). [7] Beckett, S.T., "The Effects of Sampling Practice on the Measured Concentration of Airborne Asbestos," Ann. Occuo. Hyg.. 21, 259-272 (1980). [8] Jankovic, J. T., W. Jones, and J. Clere. "Field Techniques for Clearing Cellulose Ester Filters Used in Asbestos Sampling," Appl. Ind. Hyg., 1, 145-147 (1986). [9] Crawford, N. P., H. L. Thorpe, and W. Alexander. "A Comparison of the Effects of Different Counting Rules and Aspect Ratios on the Level and Reproducibility of Asbestos Fiber Counts," Part I: Effects on Level (Report No. TM/82/23), Part II: Effects on Reproducibility (Report No. TM/82/24), Institute of Occupational Medicine, Edinburgh, Scotland (December, 1982). [10] NiOSH Manual of Analytical Methods, 2nd ed.. Vol. 1., P&CAM 239, U.S. Department of Health. Education, and Welfare, Publ. (NIOSH) 77-157-A (1977). [11] Revised Recommended Asbestos Standard, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 77-169 (1976); as amended in NIOSH statement at OSHA Public Hearing, June 21, 1984. [12] Asbestos International Association, AIA Health and Safety Recommended Technical Method #1 (RTMl). "Airborne Asbestos Fiber Concentrations at Workplaces by Light Microscopy" (Membrane Filter Method), London (1979). [13] Abell, M., S. Shulman and P. Baron. The Quality of Fiber Count Data, Appl. Jnd, Hyg.. 4, 273- 285 (1989).

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94

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