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2.3 Step 3
The
Determination of the Basic Noise Level (BNI)
appropriate BNL, in dB(A), for a given NSR may be
determined from Table 2, having regard to the appropriate ASR and the
time period as specified in the Construction Noise Permit application.
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2.4 Step 4 Correction for the
Permit (CNP)
Duration of the Construction Noise
If the duration of an initial CNP, or, in the case of a renewal
of a CNP, the combined duration of the initial CNP and any renewal or
renewals of a CNP for associated work on the same construction site, will
be less than or equal to 14 days, a positive correction of 3 dB(A) shall
be applied to the BNL.
A CNP shall be considered to be a renewal of a CNP if its date
of commencement is less than or equal to 21 days after the expiry date of
any other CNP for associated works on the same construction site.
2.5 Step 5
Correction for Multiple Site Situations
If in the opinion of the Authority the NSR will be materially
affected by noise from work associated with more than one CNP, the
Authority may make such correction to the BNL as it considers appropriate
having regard to standard acoustical principles and practices.
2.6 Step 6 - Determination of the Acceptable Noise Level (ANL)
The corrections obtained in Steps 4 and 5 shall be applied to
the BNL obtained in Step 3 to give the ANL.
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2.7 Step 7 Location of Items of Powered Mechanical Equipment (PME)
All items of PME should be considered to be grouped at a
position mid-way between the approximate geographical centre of the
construction site and its boundary nearest to the NSR. This position is
referred to as the notional source position.
If the construction site is irregular in shape the geographical
centre may fall outside the physical limits of the site. In such cass
the notional source position shall be taken to be the position on the
construction site boundary nearest to the geographical centre of the
site. If two such points exists, the point nearest to the NSR shall be
used.