BC Rapid Transit Company March 11, 2026
OMC1 Simulation Room Noise Survey - 5 - 2044.20383.2026

Noise measurement
Education and training
Engineered noise controls
Hearing protection

Posting of noise hazard areas
Hearing tests

e Annual program review

4.1 8-Hour Lex Exposure Limit
Noise has an 8-hour Lex daily noise exposure limit of 85 dB(A).

Table 1 outlines the applicable exposure limits based on the 3dB(A) exchange rate for
varying exposure time.

Table 1: Noise Exposure Limits by Exposure Time

Maximum Exposure Time per 24 hours Noise Level Exposure Limit (dBA)
0.5 97dBA
1 94 dBA
2 91 dBA
4 88 dBA
8 85 dBA
16 82dBA

4.2 Peak Noise Exposure Limit

Noise has a peak sound level exposure limit of 140 dB(C). There is no acceptable duration
of exposure to over 140 dB(C).

4.3. Health Effects of Noise Exposure

Exposure to noise can lead to noise induced hearing loss (NIHL). There are three types of
NIHL:

1. Acoustic trauma

a. Analmost instantaneous large loss of hearing caused by trauma to the inner
ear from exposure to a sudden high level of noise or a physical blow to the
head.

2. Temporary threshold shift
a. When the ear is exposed to a loud enough level of noise to reduce the

sensitivity of the hair cells in the ear. With enough time between exposures,
normal hearing will be regained.

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