Technical Memorandum on Noise from Construction Work Other Than Percussive Piling
2. ASSESSMENT OF NOISE FROM THE CONSTRUCTION WORK
| 2.1 |
Step 1- Location of the Most Affected Noise Sensitive Receiver (NSR)
The NSR which will be most affected by noise from the construction work shall be identified.
For the purpose of this Technical Memorandum any domestic premises, hotel, hostel, temporary housing accommodation, hospital, medical clinic, educational institution, place of public worship, library, court of law or performing arts centre shall be considered to be a NSR. Any other premises or place, not being in the nature of either industrial or commercial premises, which is considered by the Authority to have a similar sensitivity to noise as the premises and places above shall also be considered to be a NSR. Any premises or place shall, however, be considered to be a NSR only when it is in use for its intended purpose. |
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| 2.2 |
Step 2 - Determination of the Area Sensitivity Rating (ASR)
| 2.2.1 |
General
The ASR is a function of the type of area within which the NSR is located and the degree of the effect on the NSR of particular Influencing Factors (IFs) as defined in Section 2.2.3. After a careful examination of the area under consideration and the effect of any IFs, the ASR may be determined from Table 1. |
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| 2.2.2 |
Type of area within which the Noise Sensitive Receiver (NSR) is located
The Authority shall have regard to an area of adequate size when determining the type of area within which the NSR is located in accordance with the descriptions in Table 1. Typically, in urban areas an area of 100 m radius around the NSR should be adequate, whereas in sparsely developed areas, such as rural districts, an area of 500 m radius or even more should be considered, depending upon the circumstances. Special factors may dictate that other distances should be used at the discretion of the Authority. |
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| 2.2.3 |
Effect of Influencing Factors (IFs)
For the purpose of this Technical Memorandum any industrial area, major road or the area within the boundary of Hong Kong International Airport shall be considered to be an IF. Industrial areas and the Airport should be regarded as IFs irrespective of the time of day.
The term "industrial area" means an area which consists of a number of factories or industrial undertakings located primarily in purpose-built industrial buildings. It includes any premises, buildings or activities which the Authority deems, by virtue of their acoustical characteristics, make an area industrial in nature. The term "major road" means a road which has a heavy and generally continuous flow of vehicular traffic and, in normal circumstances, means a road with an annual average daily traffic flow in excess of 30,000. Where a major road has an unusually low traffic flow rate (less than 300 vehicles per hour) at the time of day under consideration it shall not be considered as an IF at that time.
In situations where more than one IF affects the NSR to an equal degree only one IF shall be considered. |
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| 2.2.4 |
Area Sensitivity Rating (ASR)
The Authority shall determine the appropriate ASR for the NSR under consideration from Table 1 |
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