-6-
In cases where the NSR is a
building directly adjacent to the
construction site such that none of the percussive piling works will be
visible when viewed from any window, door or other opening in any facade
of the NSR, the NSR shall be considered to be partially screened and a
negative correction of 5 dB(A) shall be applied to the PNL obtained in
Step 5.
Where the latter condition applies and the NSR is separated
from the construction site by another building such that none of the
percussive piling works will be visible when viewed from any window,
door or other opening in any facade of the NSR, the NSR shall be
considered to be totally screened.
2.7
Step 7 Correction for Acoustic Reflections
A positive correction of 3 dB(A) may be applied to the PNL obtained in
Step 5 in cases where the Authority considers that noise levels at the
NSR will be increased due to the confined or reverberant nature of the
immediate locality of the construction site and the NSR.
2.8
Step 8
Corrected Noise Level (CNL) at the Noise Sensitive
Receiver (NSR)
The corrections obtained in Steps 6 and 7 shall be applied to the PNL
obtained in Step 5 to give the CNL at the NSR.
2.9 Step 9 Determination of the Permitted Hours of Operation
The CNL at the NSR obtained in Step 8 shall be compared with the ANL
obtained in Step 2 and the appropriate permitted hours of operation
shall be determined from Table 5.
The Authority may vary the timing (but not the total duration) of the
permitted hours of operation if it considers that such variation would
be justified by the nature or requirements of any NSR which may be
affected.
The timing and total duration of the permitted hours of operation may be
varied if the application is a special case as defined in Section 3.
The procedures detailed in Section 3 shall then be followed.