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OSHA Texas Monitoring Data


  • Please Note:
  • Sample Type: A = Area; P = Personal; S=Screen
  • PEL = OSHA Permissible Exposure Limit (usually a 480 minute exposure, value listed for reference)
  • Non-Detected (ND) = Exposures less than Reporting Limit
  • NA = Not Available. Information not recorded when sample was taken.
  •  
  • a = Results reported are time weighted averages for the actual sampling period.
  • b = For comparative purposes only, the TWA > PEL box is checked Y if the actual TWA is greater than the OSHA 8-hour PEL.  Does not necessarily represent a legal PEL violation. For additional information, see Information on Sampling Results.
  •  
  • Total Fiber sample results may also include asbestos fibers.

These tables are best viewed on tablets, notebooks, or desktop computer screens.

Sample Date City where sample was collected State Work Operation Occupation Analyte Smpl Type Time Results a PEL TWA > PEL b Direct Read
10/19/05 NA TX NA NA Asbestos (all forms) A 20 ND .1 f/cc    
10/19/05 NA TX NA NA Asbestos (all forms) A 40 ND .1 f/cc    
10/19/05 NA TX NA NA Total Fibers A 60 0.2700 f/cc NO PEL    

OSHA Texas Silica Monitoring Data

  • Please Note:
  • The 8-hour OSHA Permissible Exposure Limit (PEL) for Respirable Dust containing quartz is determined individually for each sample, using the following formula:
  • PEL = 10mg/m3 ÷ (%SiO2+2), where %SiO2 refers to the amount of quartz measured in that sample.
  • This calculated PEL is compared with the Respirable Dust sample result to determine whether there is an overexposure. If there is no quartz found in a sample, the PEL for that Respirable Dust sample is 5.0 mg/m3, equivalent to the Particulates Not Otherwise Regulated PEL. The PEL for respirable dust containing quartz varies depending on the concentration of quartz in the sample. The higher the concentration of quartz the lower the PEL. For additional information, see crystalline silica (quartz) and the OSHA PEL.
  •  
  • a = Results reported are time weighted averages for the actual sampling period.
  • b = For comparative purposes only, the TWA > PEL box is checked Y if the actual TWA is greater than the OSHA 8-hour PEL. Does not necessarily represent a legal PEL violation. For additional information, see Information on Sampling Results.
Sample Date City where sample was collected State Work Operation Occupation Smpl Type Time Respirable Dust TWAb mg/m3 Crystalline Silicaa (Quartz)c%b PEL mg/m3 (based on formula) TWA > PEL
09/08/05 NA TX NA Laborers, except construction (8769) P 305 0.350 10.8 0.780  
09/08/05 NA TX NA Laborers, except construction (8769) P 305 3.800 4.1 1.633 YES
09/02/05 NA TX NA Laborers, except construction (8769) P 200 0.000 ND 5.000  
09/02/05 NA TX NA NA P 225 0.000 ND 5.000  
09/02/05 NA TX NA Dispatchers (4751) P 240 0.049 ND 5.000  
09/02/05 NA TX NA Laborers, except construction (8769) P 225 0.052 ND 5.000  
08/30/05 NA TX NA Laborers, except construction (8769 P 445 0.360 ND 5.000  
08/30/05 NA TX NA Laborers, except construction (8769) P 439 0.230 12.00 0.714  
08/30/05 NA TX NA Laborers, except construction (8769) P 463 0.180 ND 5.000  
08/30/05 NA TX NA Laborers, except construction (8769) P 458 0.450 3.20 1.923  
08/30/05 NA TX NA Laborers, except construction (8769) P 431 0.440 4.50 1.538  
08/30/05 NA TX NA Laborers, except construction (8769) P 531 0.390 21.00 0.435  
08/30/05 NA TX NA Laborers, except construction (8769) P 455 0.089 ND 5.000
08/30/05 NA TX NA Laborers, except construction (8769) P 199 0.220 18.00 0.500  

Page last updated: 02/24/05

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