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Federal Registers - Air Contaminants Correction - 58:40191


Federal Registers - Table of ContentsFederal Registers - Table of Contents
• Publication Date:07/27/1993
• Publication Type:Final Rules
• Fed Register #:58:40191
• Standard Number:1910.1000
• Title:Air Contaminants Correction

DEPARTMENT OF LABOR

Occupational Safety and Health Administration

29 CFR Part 1910

RIN 1218-A826

Air Contaminants

ACTION: Correction

In rule document 93-15292 beginning on page 35338 in the issue of Wednesday,June 30, 1993 on page 35351, table Z-3 was published incorrectly and shouldread as set forth below:

TABLE Z-3 MINERAL DUSTS
   
Substancemppcf(a)mg/m(3)
   
   
Silica:  
Crystalline250(b)10 mg/m(3)(e)
Quartz (Respirable)------------------
 %SiO(2)+5%SiO(2)+2
   
  30 mg/m(3)
Quartz (Total Dust) ---------
  %SiO(2)+2
   
Cristobalite: Use 1/2 the value  
calculated from the count or mass  
formulae for quartz  
Tridymite: Use 1/2 the value calculated  
from the formulae for quartz  
   
Amorphous, including natural diatomaceous 80 mg/m(3)
earth20--------
  %SiO(2)
   
Silicates(less than 1% crystalline  
Silica)  
Mica20 
Soapstone20 
Talc (not containing asbestos)20(c) 
Talc (Containing asbestos) Use asbestos  
limit  
Tremolite, asbestiform (see 29 CFR  
1910.1001)  
Portland Cement50 
   
Graphite (Natural)15 
   
Coal Dust:  
  2.4 mg/m3(e)
Respirable fraction less than 5% SiO(2) ------------
  %SiO(2)+2
   
Respirable fraction greater than 5%  
SiO(2) 10 mg/m3 (e)
  ------------
  %SiO(2)+2
   
Inert or Nuisance Dust:(d)  
Respirable fraction155 mg/m(3)
Total dust5015 mg/m(3)
   
Note - Conversion factors - mppcf X 35.3 = million particles per cubic meter = particles per c.c

(a) Millions of particles per cubic foot of air, based on impinger samplescounted by light-field techniques

(b) The percentage of crystalline silica in the formula is the amountdetermined from airborne samples, except in those instances in which othermethods have been show to be applicable

(c) Containing less than 1& quartz, if 1& quartz or more, use quartz limit

(d) All inert or nuisance dusts, whether mineral, inorganic, or organic, notlisted specifically by substance name are covered by this limit, which is thesame as the Particulates Not Otherwise Regulated (PNOR) limit in Table Z-1

(e) Both concentration and percent quartz for the application of this limitare to be determined from the fraction passing a size- selector with thefollowing characteristics:

 
 
  
Aerodynamic diameter (unit density sphere)Percent Passing
 selector
  
  
290
2.575
3.550
5.025
100
  
The measurements under this note refer to the use of an AEC (nowNRC) instrument. The respirable fraction of coal dust is determinedwith an MRE; the figure corresponding to that of 2.4 mg/m(3) in thetable for coal dust is 4.5 mg/m(3).
Federal Registers - Table of ContentsFederal Registers - Table of Contents



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