Lex, Leq, T And Dose. (2 Marks)
a. Why did you choose these settings? (2 marks)
The settings were based on the Canadian Safety Association (CSA Standard Z107.56) requirements and American Conference of Governmental Industrial Hygienist (ACGIH). Also the Alberta exchange rate is 3 dB based on the Alberta OHS Code. The criterion level was set at 85 dB based on the Alberta 8 hour occupational exposure level for noise.
2. Explain the difference between Lex,, Leq,t and Dose. (6 marks)
LexT, - is the level of a worker’s total exposure to noise in dBA, averaged over the entire shift length or workday and adjusted to an equivalent 8 hour exposure based on a 3dB exchange rate. It always reflects the sound level for an 8 hour work day. This parameter also allows for a comparison …show more content…
Would you consider this employee to be overexposed? Why or why not? (2 marks)
No, the worker was not overexposed because the dose of 62.9% was below the criterion level of 85dBA which is a 100% dose level.
However, the calculated dose of 62.9% was above the action level of 50% which means that a noise monitoring program should be established and controls (engineering, administrative or personal protective equipment as a last resort) should be put in place to further reduce the dose level to below the action level.
5. List and explain two environmental limitations each, of the Sound Level Meter, and the Noise Dosimeter, based on the users’ instruction manual. (8 marks)
Sound level meter
1. The relative humidity should be between 10 – 90% non-condensing. The amount of water vapour in the air during the testing period needs to be taken into consideration as this can affect the functionality of the …show more content…
The humidity for operation is 0 – 95% non-condensing. The amount of water vapour in the air during the testing period needs to be taken into consideration as this can affect the functionality of the equipment.
2. The operating temperature is -10 °C to +50 °C. This implies that the equipment will not function properly at temperature below -10°C or above +50°C .The operational functionality of the equipment can be affected by the extreme temperatures of the winter where the atmospheric temperature can fall below -10 °C. Hence sampling of noise should be scheduled during the summer, spring or fall seasons to prevent errors in the data. If sampling has to be done in the winter, then a sound level meter without this limitation should be used.
6. Based on the OHS Code, if a Noise Exposure Assessment confirms that workers are exposed to excess noise at a work site, what would be the next step an employer must take? (2 marks)
The employer must develop and implement a noise management program (also called a hearing conservation program). The program procedures should be writing and made available to the workers. The program must include the following seven components:
1. Worker
The settings were based on the Canadian Safety Association (CSA Standard Z107.56) requirements and American Conference of Governmental Industrial Hygienist (ACGIH). Also the Alberta exchange rate is 3 dB based on the Alberta OHS Code. The criterion level was set at 85 dB based on the Alberta 8 hour occupational exposure level for noise.
2. Explain the difference between Lex,, Leq,t and Dose. (6 marks)
LexT, - is the level of a worker’s total exposure to noise in dBA, averaged over the entire shift length or workday and adjusted to an equivalent 8 hour exposure based on a 3dB exchange rate. It always reflects the sound level for an 8 hour work day. This parameter also allows for a comparison …show more content…
Would you consider this employee to be overexposed? Why or why not? (2 marks)
No, the worker was not overexposed because the dose of 62.9% was below the criterion level of 85dBA which is a 100% dose level.
However, the calculated dose of 62.9% was above the action level of 50% which means that a noise monitoring program should be established and controls (engineering, administrative or personal protective equipment as a last resort) should be put in place to further reduce the dose level to below the action level.
5. List and explain two environmental limitations each, of the Sound Level Meter, and the Noise Dosimeter, based on the users’ instruction manual. (8 marks)
Sound level meter
1. The relative humidity should be between 10 – 90% non-condensing. The amount of water vapour in the air during the testing period needs to be taken into consideration as this can affect the functionality of the …show more content…
The humidity for operation is 0 – 95% non-condensing. The amount of water vapour in the air during the testing period needs to be taken into consideration as this can affect the functionality of the equipment.
2. The operating temperature is -10 °C to +50 °C. This implies that the equipment will not function properly at temperature below -10°C or above +50°C .The operational functionality of the equipment can be affected by the extreme temperatures of the winter where the atmospheric temperature can fall below -10 °C. Hence sampling of noise should be scheduled during the summer, spring or fall seasons to prevent errors in the data. If sampling has to be done in the winter, then a sound level meter without this limitation should be used.
6. Based on the OHS Code, if a Noise Exposure Assessment confirms that workers are exposed to excess noise at a work site, what would be the next step an employer must take? (2 marks)
The employer must develop and implement a noise management program (also called a hearing conservation program). The program procedures should be writing and made available to the workers. The program must include the following seven components:
1. Worker