CRYSTALLINE SILICA. Silica (Silicon dioxide) is one of the most common chemical compounds found in nature.

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2 Silica (Silicon dioxide) is one of the most common chemical compounds found in nature. Amorphous silica is common sand. The most common crystalline silica is quartz. Tridymite and cristobalite are other crystalline forms used in industry. There are alpha and beta structure forms. Alpha quartz is the most common structure.

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4 OSHA has submitted the proposed rule regulating crystalline silica in general industry, construction and maritime to the Office of Management and Budget (OMB) for review. It is expected to be published in the Federal Register in Summer 2011.

5 The new standard will update the existing Permissible Exposure Limit, establish controls for additional worker protection and require medical surveillance. OSHA recognizes that the PEL for silica is outdated and need to be revised to reflect current sampling and analytical technologies.

6 Some of the primary exposure concerns in utilities include (but not limited to): - Abrasive blasting - Concrete and rock drilling and cutting - Coal ash and dust - Refractory removal - Soil work

7 The primary health concern from crystalline silica is Silicosis. Can be chronic, accelerated or acute depending upon levels of exposure. Listed as IARC-1 carcinogen, ACGIH A2 suspected carcinogen for lung cancer. Smoking adds to the lung damage caused by crystalline silica. Particle size can run from as large as 250 micrometers to as small as nanometers.

8 Hawk s Nest Tunnel in WV was one of worst industrial disasters in US history. Estimated workers out of workforce of 3000 died of silica-related diseases. Some deaths were within 1 year of starting job.

9 The ACGIH TLV for crystalline silica is mg/m3 TWA8 as a respirable fraction. The NIOSH REL is 0.05 mg/m3 TWA10 as respirable dust. A proposed OSHA PEL is 0.1 mg/m3 TWA8 as respirable dust (not confirmed).

10 The current PEL is based on the silica concentration (quartz) of the dust. 10 mg/m % silica + 2 For Cristobalite and Tridymite, it is ½ the value for quartz. Construction standard still lists the PEL in mppcf.

11 NIOSH published a Criteria for a Recommended Standard for crystalline silica in NIOSH was founded in late Crystalline silica was one of the first recommended standards from NIOSH. Exposure limits were based on silica concentrations of the respirable dust.

12 ACGIH and NIOSH use the ISO/CEN protocol for measurement of respirable particles. This uses a cut point of 4um. OSHA uses a cut point of 3.5um. Hopefully, this will be addressed with the new standard.

13 Acceptable analytical methods include: - NIOSH 7500 (XRD) - NIOSH 7601 (VIS) - NIOSH 7602 (IR) - OSHA ID-142 (XRD)

14 The AEP Silica study examined 501 samples. The results are as follows: 1) Samples exceeding mg/m3 3.6% 2) Samples exceeding 0.05 mg/m3 2.4% 3) Samples exceeding 0.1 mg/m3 1.2% 4) Samples exceeding calculated PEL 1.0%

15 5) Samples where silica is above detectable levels 5.8% 6) Samples where respirable dust is above detectable levels 59.1% 7) Samples where respirable dust is above PEL of 5.0 mg/m3-0.8% All samples were analyzed by NIOSH 7500

16 Of the samples that exceeded the 0.1 mg/m3 level: 1) Coal yard work (0.89 mg/m3), respirable dust was 96 mg/m3, exact work not specified. 2) Operations work (0.25 mg/m3), respirable dust was 27 mg/m3, exact work not specified. 3) Glass bead blasting (1.0 mg/m3), beads may have added to overall silica levels.

17 4) Soil processing at a landfill during a construction project (0.11 mg/m3), silica concentration was 10.3%. 5) 2 samples where a chipping gun was used to remove refractory (0.18 and 0.12 mg/m3).

18 From the coal-related exceedances, both had high respirable dust concentrations. Blasting and chipping would be expected to have high exposure potential, precautions should have been taken prior to start of job. Additional controls were added to the soil processing after the exceedance was noted.

19 OSHA has cited several companies since a National Emphasis Program in The citations include: - overexposure to respirable silica - lack of respiratory protection program - lack of training on hazards of silica - lack of written HAZCOM program for employees exposed to silica

20 Engineering controls include: 1) Substitution to a less hazardous product 2) Use of wet saws 3) Dust collection systems 4) Local exhaust ventilation 5) Use of water as dust control

21 Administrative controls include: 1) Understanding of the work practices that can lead to silica exposure 2) Training programs 3) Employee rotation (if permitted) 4) Good hygiene when working around silica 5) Good hygiene after working around silica

22 Personal Protective Equipment (PPE) good option as a temporary control, last choice for permanent control. PPE includes: 1) Disposal or washable coveralls (laundry notification?) 2) Respiratory protection varies depending on work performed.

23 3) The P-100 filter is the proper filtration. 4) The OSHA Ventilation Standard - ( & ) contains specific respiratory protection requirements for abrasive blasting operations. The proper respirator for abrasive blasting is the Type CE Respirator.

24 Type CE abrasive-blast supplied-air respirators are the only respirators suitable for use in abrasive-blasting operations. The approved types are: - continuous-flow respirator with a loose-fitting hood (APF 25, 1000 if manufacturer rated) - continuous-flow respirator with a tight-fitting facepiece (APF 50 for half-face, 1000 for full-face) - positive-pressure respirator with a tight-fitting half-mask facepiece (APF 50) - pressure-demand or positive-pressure respirator containing a tightfitting full facepiece (APF 1000)

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27 Trona used in FGD systems to mitigate SO3 is less than 2% silica as listed on MSDS. Personal air monitoring has not indicated excessive levels of silica exposure.

28 While it is not certain as to the degree the new silica standard will affect the electric industry, the overall impact should not be dramatic. Coal dust and ash should not be of concern at the normal levels to which a worker is subjected to on a daily basis. Levels where the respirable dust PEL could be exceeded may have silica exceedances, also.

29 While the health effects of silica can be severe, it is entirely preventable with proper engineering controls, administrative controls and PPE. OSHA has a wealth of information available on crystalline silica on their website osha.gov

30 ANY QUESTIONS????

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