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HS Kan March 2007

CIVL 395 Environmental Impact Assessment [4] Housing Development in Tuen Mun Area 1 Proposed Bridge at Tuen Mun Area 18. HS Kan March 2007. Air Impact Assessment – CALINE4. www.dot.ca.gov/hq/env/air/index.htm. Noise Impact Assessment. Noise measurement – A-weighting for human perception.

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HS Kan March 2007

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  1. CIVL 395 Environmental Impact Assessment [4]Housing Development in Tuen Mun Area 1Proposed Bridge at Tuen Mun Area 18 HS Kan March 2007

  2. Air Impact Assessment – CALINE4 • www.dot.ca.gov/hq/env/air/index.htm

  3. Noise Impact Assessment

  4. Noise measurement – A-weighting for human perception

  5. Facade Noise Levels from Road Traffic (Extracted from The Hong Kong Planning Standards & Guidelines, Planning Department) Peak hourtraffic flow (veh/h) Facade noise levels L10(1h), dB(A) -Vehicular speed (30 kph) Facade noise levels L10(1h), dB(A) -Vehicular speed (50 kph) Facade noise levels L10(1h), dB(A) -Vehicular speed (70 kph) Facade noise levels L10(1h), dB(A) -Vehicular speed (85 kph) Facade noise levels L10(1h), dB(A) -Vehicular speed (100kph) 250 70 71 72 73 74 500 73 74 75 76 77 1000 76 77 78 79 80 2000 79 80 81 82 83 3000 80 81 82 83 84 5000 83 84 85 86 87 10000 86 87 88 89 90

  6. Noise Impact Assessment • Legislation, standards and criteria • Noise Control Ordinance • Technical Memorandum on Noise from Places other than Domestic Premises, Public Places or Construction Sites • Technical Memorandum on Noise from Construction Work other than Percussive Piling • http://www.epd.gov.hk/epd/english/environmentinhk/noise/guide_ref/tm_nonpp.html • Technical Memorandum on Noise from Percussive Piling • Noise sensitive receivers • All domestic premises, hotel, hospital, educational institution, place of public worship, library, court, arts performance facilities, etc • Area Sensitivity Ratings ASR • Urban / rural / low-density residential • Table 1 in the Technical Memorandum • Influencing factors IF (on the ASR) • Presence of industrial areas, major roads, etc • Basic noise levelsBNL • Table 2 in the Technical Memorandum • Sound levels for Powered Mechanical EquipmentPME • Table 3 in the Technical Memorandum • For summation of different sources, Table 4 in the Technical Memorandum • Acceptable noise levels ANL • For this exercise, you may take the ANL as being directly equal to the BNL • Distance attenuation • Distance attenuation in dB(A) = 20 log D + 8, where D = distance in m • Table 5 in the Technical Memorandum

  7. Outline Zoning Plan of the Bridge Site Source: The Planning Department website

  8. During foundation works: bored piling machine, air compressor, excavator, steel bender, etc; • During pile construction: concrete truck mixer, concrete pump, vibratory poker, etc. • (3) etc. Consider mainly the noise impact from powered mechanical equipment at the southern abutment at various stages, e.g. Proposed Bridge at Tuen Mun Area 18

  9. Table 1 - Area Sensitivity Ratings (ASRs) Type of Area Containing NSR Degree to which NSR is affected by IF Not Affected Indirectly Affected Directly Affected Rural area, including country parks or village type developments A B B Low density residential area consisting of low-rise or isolated high-rise developments A B C Urban area B C C Area other than those above B B C

  10. Basic Noise Levels(BNLs) Time Period ASR A B C All days during the evening (1900 to 2300 hours), and general holidays (including Sundays) during the day-time and evening (0700 to 2300 hours) 60 65 70 All days during the night-time (2300 to 0700 hours) 45 50 55 Table 2 of the Technical Memorandum

  11. Table 4 - Summation of Noise Levels Difference in dB(A) between two noise levels being summed Amount in dB(A) to add to the higher noise level 0 to 0.5 3.0 1.0 to 1.5 2.5 2.0 to 3.0 2.0 3.5 to 4.5 1.5 5.0 to 7.0 1.0 7.5 to 12.0 0.5 more than 12.0 0

  12. Transmission Source Receiver Control of Noise Impact • The Source • Elimination, Reduction, Shielding, Absorption • The Transmission • Breaking, Weakening • The Receiver • Shielding, Protection, Removal

  13. Noise Impact Assessment • Control and mitigation • Construction • Choice of construction method • Use of silenced powered mechanical equipment • Proper equipment maintenance • Proper location and orientation of equipment • Noise screens • Good site practices • Operation • Reduction • Containment • Shielding • Protecting the receiver

  14. Cantilever Barrier at West Kowloon Expressway

  15. Enclosure barrier at Wong Chu Road, Tuen Mun

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