| Appendix 4.2 Construction Noise Impact Assessment | ||||||||||||||
| (C2) Proposed Powered Mechanical Equipment for Various Construction Tasks for NSR BOS (during examination period) | ||||||||||||||
| - Mitigated Scenario (with Quiet Plant) | ||||||||||||||
| (I) Raw Water Mains Construction | ||||||||||||||
| Activity A - Excavation of Trench / Breaking up Pavement | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Excavator (mini) | BS C.3, item 108 | 1 | 97 | 100% | 0 | 97 | ||||||||
| Wheeled
excavator/loader fitted with hydraulic rock breaker * |
BS C.8, item 12 | - | 106 | 100% | - | - | ||||||||
| Air Compressor * | BS C.3, item 101 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Lorry * | BS C.8, item 25 | 1 | 96 | 50% | 0 | 93 | ||||||||
| Total | 102 | |||||||||||||
| Activity B - Installation of Pipes and Bedding | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Mobile crane (mini) | BS C.7, item 118 | 1 | 99 | 100% | 0 | 99 | ||||||||
| Lorry (mini) * | BS C.8, item 25 | 1 | 96 | 50% | 0 | 93 | ||||||||
| Total | 100 | |||||||||||||
| Activity C - Backfilling | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Compactor | CNP 050 | 2 | 105.0 | 100% | 0 | 108 | ||||||||
| Total | 108 | |||||||||||||
| Activity D - Reinstating Road Surface | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Lorry (mini) * | BS C.8, item 25 | 1 | 96 | 50% | 0 | 93 | ||||||||
| Concrete mixer (electric) | CNP 045 | 1 | 96 | 100% | 0 | 96 | ||||||||
| Air Compressor * | BS C.3, item 101 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Generator * | CNP 103 | 1 | 95 | 100% | 0 | 95 | ||||||||
| Vibratory poker hand-held * | BS C.6, item 32 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Total | 105 | |||||||||||||
| (II) Demolition of Pui O Raw Water Pumping Station | ||||||||||||||
| Activity A - General Site Clearance / Demolition Works | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Air compressor (air flow > 30 m3/min) | CNP 003 | 1 | 104 | 100% | 0 | 104 | ||||||||
| Hand-held pneumatic breaker * | CNP 024 | 1 | 108 | 100% | 0 | 108 | ||||||||
| Backhoe with hydraulic breaker * | BS C.8, item 13 | 1 | 110 | 100% | 0 | 110 | ||||||||
| Mobile Crane * | BS C.7, item 114 | 1 | 101 | 100% | 0 | 101 | ||||||||
| Dump truck * | BS C.9, item 20 | 1 | 103 | 100% | 0 | 103 | ||||||||
| Excavator * | BS C.3, item 97 | 1 | 105 | 100% | 0 | 105 | ||||||||
| Lorry mounted Crane * | BS C.7, item 114 | 1 | 101 | 100% | 0 | 101 | ||||||||
| Generator * | CNP 102 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Total | 114 | |||||||||||||
| (III) Construction of Pui O Raw Water Pumping Station | ||||||||||||||
| Activity A - Foundation | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Air compressor | CNP 003 | 1 | 104 | 100% | 0 | 104 | ||||||||
| Piling Rig * | CNP 166 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Backhoe with hydraulic breaker * | BS C.8, item 13 | 1 | 110 | 100% | 0 | 110 | ||||||||
| Mobile Crane * | BS C.7, item 114 | 1 | 101 | 100% | 0 | 101 | ||||||||
| Dump truck * | BS C.9, item 20 | 1 | 103 | 100% | 0 | 103 | ||||||||
| Excavator * | BS C.3, item 97 | 1 | 105 | 100% | 0 | 105 | ||||||||
| Water Pump | CNP 281 | 1 | 88 | 100% | 0 | 88 | ||||||||
| Generator * | CNP 102 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Total | 113 | |||||||||||||
| Activity B - Superstructural Works | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Air compressor | CNP 003 | 1 | 104 | 100% | 0 | 104 | ||||||||
| Bar Bender and Cutter | CNP 021 | 1 | 90 | 100% | 0 | 90 | ||||||||
| Concrete Mixer Truck * | BS C.6, item 23 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Concrete Poker Vibrator * | BS C.6, item 32 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Concrete Pump * | BS C.6, item 36 | 1 | 106 | 100% | 0 | 106 | ||||||||
| Mobile Crane * | BS C.7, item 114 | 1 | 101 | 100% | 0 | 101 | ||||||||
| Dump truck * | BS C.9, item 20 | 1 | 103 | 100% | 0 | 103 | ||||||||
| Excavator * | BS C.3, item 97 | 1 | 105 | 100% | 0 | 105 | ||||||||
| Generator * | CNP 102 | 1 | 100 | 100% | 0 | 100 | ||||||||
| Total | 112 | |||||||||||||
| Activity C - Installation of E&M Equipment and Commissioning & Testing | ||||||||||||||
| Powered Mechanical Equipment | TM Ref./ | No. of Items | SWL/Item | On-time | Barrier | Total SWL | ||||||||
| (PME) | other Ref. | dB(A) | % | dB(A) | dB(A) | |||||||||
| Mobile Crane * | BS C.7, item 114 | 1 | 101 | 100% | 0 | 101 | ||||||||
| Lorry (mini) * | BS C.8, item 25 | 1 | 96 | 50% | 0 | 93 | ||||||||
| Total | 102 | |||||||||||||
| Note: | ||||||||||||||
| BS BS5228 (1997) Part 1 Noise and Vibration Control on Construction and open sites | ||||||||||||||
| * Adoption of Quiet PME | ||||||||||||||