TNAG-0855-FCO40-1065-Construction-of-underground-railway-system-in-Hong-Kong-1979 — Page 60

6.

(b)

The Corporation shall provide and

maintain adequate mechanical means of ventilation

of the railway to ensure at all times tolerable

environmental conditions.

(c)

, except in an emergency The Corporation shall ensure that the

noise emitted.

(i)

by any ventilation system when measured

at a distance of 10 m. from a ventilation

shaft or cooling tower does not exceed.

the International Standards Organisation

noise rating curve

(a) N.R. at any time

(b) N.R. between the hours of 11 p.m.

and 6 a.m.

(ii)

from any part of the railway is as far

as is reasonably practicable kept to a

minimum consistent with proper maintenance

and good operational practice.

(a)

The Corporation shall ensure that

vibration emitted due to the operation of the railway

is at all times kept to a minimum consistent with

proper maintenance and good operational practice.

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