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Percussive Piling


Determine the Acceptable Noise Level (ANL)

- Sensitivity of Noise Sensitive Receiver (NSR)

		Normal NSR

		Sensitive NSR

- NSR window type

		NSR with windows or other openings but without central air conditioning system
		NSR (or part of NSR) with no windows or other openings

		NSR with central air conditioning system

ANL

dB(A)

Determine the total Sound Power Level
- Piling method and pile type				No. of unit

Total
Sound Power Level

dB(A)

Determine the Corrected Noise Level (CNL) at the NSR
- Distance between the NSR and the pile location nearest to the NSR			m
- Effect of barrier / screening
	There is substantial barrier between NSR facade and all of the percussive piling
	NSR is a building directly adjacent to the construction site such that none of the percussive piling will be visible from NSR
	None
-Will the noise level be increased due to the confined or reverberant nature of the immediate locality of the construction site or the NSR		Yes No

CNL at
nearest NSR

dB(A)

CNL - ANL =

dB(A)

The permitted hours of piling operation under a Construction Noise Permit shall depend on the piling method and the value of (CNL-ANL). See table on permitted hours of operation

Note: All calculations above are for quick reference only. The issuance of the Construction Noise Permit shall be subject to the result of technical assessment in accordance with the procedures in the relevant Technical Memorandum.