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- Normal NSR (e.g. domestic premises, hotel, hostel, temporary housing accommodation, place of public worship, library, performing arts centre or office building)
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- Sensitive NSR (e.g. hospital, medical clinic, educational institution, court of law)
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- With no windows or other openings
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- With windows or other openings but without central air conditioning system
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- With central air-conditioning system
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- Diesel hammer driving pre-stressed concrete pile, 128dB(A)
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- Diesel hammer driving steel pile, 132dB(A)
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- Diesel hammer driving steel sheet pile, 132dB(A)
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- Drop hammer driving concrete pile, 116dB(A)
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- Drop hammer driving steel pile, 126dB(A)
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- Drop hammer driving steel sheet pile, 129dB(A)
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- Hydraulic hammer (double acting) driving pre-stressed concrete pile, 126dB(A)
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- Hydraulic hammer (double acting) driving steel pile, 129dB(A)
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- Hydraulic hammer (double acting) driving steel sheet pile, 129dB(A)
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- Hydraulic hammer (single acting) driving pre-stressed concrete pile, 122dB(A)
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- Hydraulic hammer (single acting) driving steel pile, 126dB(A)
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- Hydraulic hammer (single acting) driving steel sheet pile, 126dB(A)
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- Internal drop hammer, 113dB(A)
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- Pneumatic or steam hammer (double acting) driving steel sheet pile, 135dB(A)
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- Pneumatic or steam hammer (single acting) driving steel pile, 130dB(A)
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Substantial barriers shall be taken to be large solid objects, such as buildings or topographical features, which will act as effective acoustic screens. Barriers which are small, lightweight, incomplete or temporary, such as site fences or hoardings, are not to be considered.
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NOT Involving the Use of Diesel, Pneumatic and/or Steam Hammers
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Condition
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Permitted hours of operation on any day not being a general holiday
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10 dB(A)<CNL - ANL
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3 hours
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0 dB(A)<CNL - ANL <=10dB(A)
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5 hours
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CNL - ANL <=0dB(A)
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12 hours
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Involving the Use of Diesel, Pneumatic and/or Steam Hammers
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Condition
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Permitted hours of operation on any day not being a general holiday
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-10 dB(A)<CNL - ANL
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Nil
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CNL - ANL <= -10dB(A)
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12 hours
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*The distribution of the permitted hours of operation (but not the total duration) will be varied if justified by the nature
or requirements of any NSR which may be affected, such as the need to avoid the teaching hours of affected schools.
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