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30 CFR Part 62: Requirements and Best Practices for Metal/Nonmetal and Aggregate Mines

30 CFR Part 62: Requirements and Best Practices for Metal/Nonmetal and Aggregate Mines. Randy Cardwell Vacaville, CA Field Supervisor Metal/Nonmetal Mine Safety and Health. What Does MSHA Require?. 30 CFR 62.130(a):

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30 CFR Part 62: Requirements and Best Practices for Metal/Nonmetal and Aggregate Mines

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  1. 30 CFR Part 62: Requirements and Best Practices for Metal/Nonmetal and Aggregate Mines Randy Cardwell Vacaville, CA Field Supervisor Metal/Nonmetal Mine Safety and Health

  2. What Does MSHA Require? 30 CFR 62.130(a): • “If during any workshift a miner’s exposure level exceeds the permissible exposure level,(PEL) the operator must use all feasible engineering and administrative controls to reduce the miner’s noise exposure to the permissible exposure level….” • “…without adjustment for the use of hearing protectors.” – Compliance Guide to MSHA’s Occupational Noise Exposure Standard, IG-33, p. 4

  3. Noise Basics • The two factors that determine how hazardous noise is are: • Intensity (Loudness) measured in dBA • Time of Exposure measured in Hours and Minutes • The louder the noise, the more hazardous it is. Also, the longer the exposure time, the more hazardous the noise is. • A “Noise Dose” combines both loudness and time and is a convenient way of describing the relative hazard of the noise.

  4. Noise Basics Loudness is measured using a logarithmic scale. This means that a 10 decibel increase does not simply add 10 to the previous level. It multiplies the previous level by 10. Threshold of Hearing 0 dBA Quiet Room 45 dBA Conversation 55 dBA = 45 dBA x 10 Car (50 mph at 50 ft) 65 dBA = 45 dBA x 100 End Loader (In Good Cab) 75 dBA = 45 dBA x 1,000 Haul Truck (In Good Cab) 85 dBA = 45 dBA x 10,000 Crusher 95 dBA = 45 dBA x 100,000 Old Dozer (No Cab) 105 dBA = 45 dBA x 1,000,000 Air Track Drill (No Controls) 115 dBA = 45 dBA x 10,000,000 115 dBA has 10 million times more sound energy than 45 dBA and is capable of causing 10 million times more damage to hearing.

  5. Noise Basics • Allowable Noise exposure is based on Noise Dose. • Noise Dose is expressed as a percentage of the allowable limit. How high it goes depends on both noise intensity and time of exposure to noise. • Louder (More dBA) = More Noise Dose • Longer (More Time) = More Noise Dose Absolute Quiet = 0% Noise Dose. 85 dBA for 8 Hrs = 50% Noise Dose. 90 dBA for 8 hrs = 100% Noise Dose. 95 dBA for 8 Hrs = 200% Noise Dose. 95 dBA for 12 Hrs= 300% Noise Dose.

  6. §62.120 Action Level (AL) • Action level- an 8-hour time weighted average (TWA8)sound level of 85 dBA integrating all sound levels from 80 to at least 130 dBA • Section 62.120 states that if a miner’s noise exposure equals or exceeds the action level during any work shift, then you are required to enroll the miner is a hearing conservation program.

  7. Compliance with Action Level (85 dBA) Action Level (Dose) Results >66% <66% Was PEL Dose ≥ 132%? Yes Go to PEL chart Periodic Re-evaluation No Is miner in HCP? No Yes Is HCP compliant with all parts of 62.150? No Corrective Action Yes Periodic Re-evaluation

  8. § 62.130 Permissible exposure limit (PEL) • Permissible exposure limit- an 8 hour time weighted average (TWA8) sound level of 90 dBA integrating all sound levels from at least 90-140 dBA • If a miner’s nose exposure exceeds the permissible exposure limit, you are required to enroll the miner in a hearing conservation program, implementing all feasible engineering and administrative controls • Maximum exposure of 115 dBA

  9. Compliance with the PEL (90 dBA) PEL (Dose) Results Is Dual Hearing Protection Worn? Corrective Action >1056% <132% No >132% Yes Periodic Re-evaluation Are all feasible engineering and administrative controls implemented and maintained? Yes Are administrative control procedures posted & copies provided to affected miners? No Corrective Action Yes Are administrative control procedures being followed? Yes Is miner enrolled in an Hearing Conservation Program compliant with 62.150? Yes Are miners using required hearing protection? Yes Periodic Re-evaluation

  10. § 62.140 Dual Hearing Protection • Dual hearing protection- an 8 hour time weighted average of 105 dBA • If noise exposure is exceeded then use of both earplug and earmuff type hearing protection must be worn

  11. § 62.110 Noise exposure assessment • “The mine operator must establish a system of monitoring that evaluates each miner’s noise exposure sufficiently to determine continuing compliance with this part.” • Determine dose using a noise dosimeter or a sound level meter • Miner notification

  12. Noise Sampling • Two types of instruments commonly used for measuring noise are: • Sound Level Meter (SLM) • Cost as low as $40. Takes single noise measurements. (Because of this, a great deal of work must be done to calculate Noise Doses.) • Noise Dosimeter • High-cost instrument ($2000 and up). Takes measurements constantly and does all the work of calculating Noise Dose.

  13. § 62.150 Hearing Conservation • The following are required for compliant hearing conservation program • Independent requirements under part 62.

  14. Hearing conservation must include: System of monitoring Provision and use of hearing protectors Audiometric testing Training Record keeping § 62.150 Hearing Conservation Program

  15. § 62.110 System of Monitoring • Performance based requirement • Notify miners of their exposure if action level (AL) or permissible exposure limit (PEL) is exceeded • Can use representative sampling • Best Practice: Use of noise dosimeters • Calibrate and maintain equipment • Knowledgeable person conducting and interpreting sampling • Exposure based on full-shift

  16. § 62.160 Hearing Protectors • Train the miner on types of hearing protectors and the value of wearing hearing protection • Allow miner to choose • Ensure good condition and fit • Provided at no cost to miner • Worn if exposure is over the permissible exposure limit as supplement to controls • Worn if exposure is over the action level if threshold shift or 6 months until baseline audiogram

  17. Hearing Protectors • When and what type… • TWA8 – Time-weighted Average 8-hour sound level (dBA) • D – Noise Dose (%) • Action Level (TWA8≥ 87 dBA or D ≥ 66%) • Operator must provide two plug types & two muff types of hearing protection • It is the miner’s option to wear hearing protection, UNLESS • The miner has incurred a Standard Threshold Shift (STS); or • More than 6 months will pass before the miner can take a baseline audiogram • Permissible Exposure Level (TWA8 > 92 dBA or D > 132%) • Miner must wear one type of operator-provided hearing protection • Dual Hearing Protection Level (TWA8 > 107 dBA or D > 1056%) • Miner must wear both earplug and earmuff type operator-provided hearing protection • BEST PRACTICE: hearing protectors should be fitted by trained professional

  18. § 62.170-175 Audiometric testing • The Standard doesn't mandate Audiometric testing,but it must be offered to all employees enrolled in a hearing conservation program. It can also be a condition of employment required by the company. • Audiometric testing is conducted by a physician or audiologist. • Baseline audiometric testing must be provided within 6 months of enrollment in the hearing conservation program (12 months if mobile lab is used.) • Annual audiometric testing must be offered thereafter on employees who were baseline tested.

  19. Reporting of Hearing Loss • REPORTABLE HEARING LOSS - A change in hearing sensitivity for the worse, relative to the miner’s baseline audiogram, or the miner’s revised baseline audiogram where one has been established in accordance with § 62.170(c) (2), of an average of 25 dB or more at 2000, 3000, and 4000 Hz in either ear. • STANDARD THRESHOLD SHIFT - A change in hearing sensitivity for the worse relative to the miner’s baseline audiogram, or relative to the miner’s most recent revised baseline audiogram where one has been established, of an average of 10 dB or more at 2000, 3000, and 4000 Hz in either ear.

  20. § 62.180 Training • Conducted within 30 days of enrollment into Hearing Conservation Program • Refresher training every12 months thereafter • Topics • Effects of noise on hearing • Purpose and value of engineering controls and wearing hearing protection • Pros and Cons of hearing protection offered • Care, fit, and use of available hearing protection • General requirements of 30 CFR Part 62 • Maintaining noise controls • Purpose, value, and procedures of audiometric testing

  21. § 62.190 Records • The mine operator is required to keep accurate records of the following: • Training certifications • Notice of exposure • Audiogram results • Reportable hearing loss • It is recommended that the miner keep copies of any information provided by the mine operator for his/her own record

  22. More Information • Contact local field office and district office • MSHA noise resource page • http://www.msha.gov/1999noise/noiseresources.htm • Noise Control Resource Guide • Noise sampling guidance • Workshop materials • Various presentations

  23. Questions? Comments?

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