OIPC INV-F-26-01595 / WCB-2026-0897 Page 32 of 34

Data collected in various work environments with similar noise sources indicate exposures
below hazardous levels. WorkSafeBC has noise data from a BC Ferry data center in 1991
and from the central computer processing area of a large hospital in 1992 indicating
exposure levels of 79 and 72 dBA, respectively. Data on mechanical switch rooms also
indicate exposure levels well below the hazardous criterion (measured at 70 dBA). These
measurements take into consideration noise from servers, network equipment, and air
conditioning equipment.

Measurements used to assign exposure have been collected using appropriate equipment
and analyzed by professionals trained and experienced in noise measurement
methodology (e.g. Occupational Hygienists).

Please comment on the best working diagnosis for the condition described.

Please comment on whether the sound exposure would be causative or materially worsen
this condition.

MA comments: The reported symptoms or migraine and ear
pain

Please comment on the biological plausibility of this sound exposure aggravating,
accelerating, or activating a pre-existing migraine condition.