Document 2qXkLDpz5G55D7QmG8zND55wa

Federal Register / Vol. 51. No. 119 / Friday. June 20, 1986 / Rules and Regulations 22739 provided as soon as possible but no later than the following schedule: (A) Employees whose 8-hour TWA exposure exceeds 2 fibers/cc--July 21, 1986. (B) Employees whose 8-hour TWA exposure exceeds the PEL but is less than 2 fibers/cc--November 17,1986. (C) Powered air-purifying respirators provided under paragraph Cg)(2)(ii)--* January 16.1987. (iv) Hygiene and lunchroom facilities. Construction plans for changerooms. showers, lavatories, and lunchroom facilities shall be completed no later than January 16.1987; and these facilities shall be constructed and in use no later than July 20.1987. However, if as'part of the compliance plan it is predicted by:an independent engineering firm that engineering controls and work practices will reduce exposures below the permissible exposure limit by July 20,1988, for affected employees, then such facilities need not be completed until l.year after the engineering controls are completed, if such controls have not in fact succeeded in reducing exposure to below the permissible exposure limit. (v) Employee information and training. Employee information and training required by paragraph (j)(5J of this section shall be provided as soon a9 possible but no later than October 20, 1986. (vi) Medical surveillance. Medical examinations required by paragraph (1) of this section shall be provided as soon as possible.But no later than November 17.1988. (yii) Compliance program. Written compliance programs required by paragraph (f)(2) of this section as a result of initial monitoring shall be completed and available for inspection and copying as soon as possible but no later than July 20,1987. ' (viii) Methods of compliance. The engineering.and work practice controls as required by paragraph (f)(1) shall be iniplemented.as soon aS possible but no later than July 20,1988. (p) Appendices. (1) Appendices A,' C, D, and E to this section are incorporated as part of this section and the contents of these Appendices are mandatory (2) Appendices B, F, G and .H to this - section-are informational-and are not , intended to create any additional obligations not otherwise imposed or to detract from any existing obligations. Appendix A to 1910.1001--Osha Reference Method--Mandatory This mandatory appendix specifies the procedure for analyzing air samples for asbestos. tremolite, anthophyllite. and .actinolite and specifies quality control - procedures that must be implemented by laboratories performing the analysis. The sampling and analytical methods described below represent the elements of the available monitoring methods (such as the NIOSH 7400 method) which OSHA considers to be essential to achieve adequate employee exposure monitoring while allowing employers to use methods that are already established within their organizations. All employers who are required to conduct air monitoring under paragraph (f) of the standard are required to utilize analytical laboratories that use this procedure, or an equivalent method, for collecting and analyzing samples. Sampling and Analytical Procedure 1. The sampling medium for air samples shall be mixed cellulose ester filter membranes. These shall be designated by the manufacturer as suitable for asbestos, tremolite. anthophyllite, and actinolite counting. See below for rejection of blanks. 2. The preferred collection device shall be the 25-mm diameter cassette with ah open- faced 50-mm extension cowl The 37-mm cassette may be used if necessary but only if written justification for the need to use the 37-mm filter cassette accompanies the sample results in the employee's exposure monitoring record. 3. An air flow rate between 0.5 liter/min and 2.5 liter9/min shall bo selected for the 25- mm cassette. If the 37-mm cassette is used, an air flow rate between 1 liter/min and 2.5 liters/min shall be selected. 4. Where possible, a sufficient air volume for each air sample shall be collected to yield between 100 and 1.300 fibers per square millimeter on the membrane niter. If a filter darkens in appearance or if loose dust is seen on the filter, a second sample shall be started. 5. Ship the samples in a rigid container with sufficient packing material to prevent dislodging the collected fibers. Packing material that ha9 a high electrostatic charge ori.its surface (e.g., expanded polystyrene) cannot be used because such material can cause loss of fibers to the sides of the cassette. 6. Calibrate each personal sampling pump before and after use with a representative filler cassette installed between the pump and the calibration devices. 7. Personal samples shall be taken !in the "breathing zone" of the employee (i.e.,. ; . attached to or near the collar or lapel near . the worker's face). . 8. Fiber counts shall be made by positive phase contrast using a microscope with an 8 to 10 X eyepieceahd a 40 to 45 X objective for: a total magnification of approximately 400 X.and a numerical aperture of 0.65 to0.75. The micioscope.shaU also be fitted with a . green or blue filter, r 9. The microscope shall be fitted with a Walton-Beckett eyepiece graticule calibrated for a field diameter of 100 micrometers .(;}/ ' --2 micrometers). 10. The phase-shift detection limit of the microscope shall be about 3 degrees'' measured using the HSE phase shift test slide as outlined below. '. a. Place the test slide on the microscope stage and center it under the phase-objective. b. Bring the blocks of grooved tines into focus. Note.--The slide consists of seven sets of grooved lines (ca. 20 grooves to each block) in descending order of visibility from sets 1 to 7, seven being the least visible. The requirements for asbestos, tremolite, anthophyllite, and actinolite counting are that the microscope optics must resolve the * grooved lines in set 3 completely, although they may appear somewhat faint, and that the grooved lines In sets 6 and 7 must be invisible. Sets 4 and 5 must be at least partially visible but may vary slightly in visibility between microscopes. A microscope that fails to meet these requirements has either too low or too high a resolution to be used for asbestos, tremolite, anthophyllite. and actinolite counting. c. If the image deteriorates, clean and. adjust the microscope optics. If (he problem persists, consultthe microscope manufacturer. 11. Each set of samples taken will include 10 percent blanks or a minimum of 2 blanks. The blank results shall be averaged and subtracted from the analytical results before reporting. Any samples represented by a blar.k having a fiber count in excess of 7 fibcrs/100 fields shall be rejected. 12. The samples shall be mounted by the acetone/triadetin method or a method with an equivalent index of refraction and similar clarity. 13. Observe the following counting rules. a. Count only fibers equal to or longer than 5 micrometers. Measure the length of curved fibers along the curve. b. Count all particles as asbestos, tremolite, anthophyllite, and actinolite that have a length-to-width ratio (aspect ratio) of 3:1 or greater. . c. Fibers lying entirely within the boundary of the Walton-Beckett graticule field shall receive a count of i. Fibers crossing the boundary once, having one end within the circle, shall.receive the count of one half (Vi). Do not count any fiber that crosses the graticule boundary more than once. Reject and do not count any other fibers even thoughjthey may be visible outside.the 1 gradicule area. d. Count bundles of fibers as one fiber unless individual fibers can be identified by observing both ends of en'individual fiber. e. Count enough graticule fields4o yield 100 fibers. Cpurit a minimum of 20 fields: stop ` counting at 100 fields regardless of fiber count. ; :. 14. Blind recounts shall be conducted at the rate of 10 percent. Quality Control Procedures ' ` 1, Intralaboratory program. Each.laboratory and/or each company with more than one microscopist counting slides shall establish a statistically designed quality assurance, program involving blihd'recounts. and ' . comparisons between microscoplsts to monitor the variability of counting by each.microscopist and between microsc6pists.:ln a company with more than one laboratory, the * program shall include all laboratories and shall also evaluate the laboratory-toiaboratory variability.. GLEASON-000987