Appendix 4.14a
Assumed Powered Mechanical Equipment for Pavement Breaking and Trench Excavation with Rock during Sewer Construction (With the Use of Quiet Equipment, Restriction on Number of Plant Operating and Use of Noise Screening Structures)
Breaking up pavement
Powered Mechanical Equipment Reference No. Items SWL/Item On-Time Barrier Attenuation Sub-total Total SWL Total SWL
(PME)     dB(A) % dB(A) SWL dB(A) dB(A) dB(A)
Kick Ripper, Saw-and life method R2 1 103 100% 5 98 98.0 98.00
Excavation of Trench
Powered Mechanical Equipment Reference No. Items SWL/Item On-Time Barrier Attenuation Sub-total Total SWL Total SWL
(PME)     dB(A) % dB(A) SWL dB(A) dB(A) dB(A)
Excavator (mini) BS C.3, item 108 1 0 100%   0    
Hand-held breaker CNP 024 1 108 100% 10 98  
Air Compressor BS C.7, item 17 1 90 100%   90  
Lorry (mini) BS C.8, item 25 1 0 100%   0 98.6 98.64
Note:
BS  BS5228 (1997) Part 1 Noise and Vibration Control on Construction and open sites
Submarine Outfall
Erection of Steel Working Platflorm
Powered Mechanical Equipment Reference No. Items SWL/Item On-time   Sub-total Total SWL Total SWL
(PME)     dB(A) %   SWL dB(A) dB(A) dB(A)
Setting up Steel Working Platform            
Air Compressor CNP 003 1 104 100%   104    
Percussion Drill rig, equiped with down the hole hammer CNP 072 1 110 100%   110    
Generator CNP101 1 108 100%   108    
Crane CNP 048 1 112 100%   112    
Barge CNP 016 1 104 100%   104 8.0 115.70
Grouting    
Generator CNP101 1 108 100%   108    
Grout Pump CNP 106 1 105 100%   105 4.0 109.76
Installation of Steel Casing in Rock      
Air Compressor CNP 003 1 104 100%   104    
Percussion Drill rig, equiped with ODEX CNP 072 1 110 100%   110 4.0 110.97
Erection of Scaffold
Powered Mechanical Equipment Reference No. Items SWL/Item On-time   Sub-total Total SWL Total SWL
(PME)     dB(A) %   SWL dB(A) dB(A) dB(A)
Generator CNP101 1 108 100%   108    
Vibrating Hammer CNP 172 1 115 100%   115    
Barge CNP 016 1 104 100%   104 5.8 116.07
Drilling and Installation of HDPE Pipeline
Powered Mechanical Equipment Reference No. Items SWL/Item On-time   Sub-total Total SWL Total SWL
(PME)     dB(A) %   SWL dB(A) dB(A) dB(A)
Horizontal Drilling System1 CNP 101 1 108 100%   108 5.8  
Direct-drive mixing system1 CNP 101 1 108 100%   108
Reclaimer2 CNP 282 1 103 100%   103
Note:
1   based on diesel generator
2   based on water pump
R2 - Commercially available quiet concrete demolition method in Hong Kong
Installation of Pipes and Bedding
Powered Mechanical Equipment Reference No. Items SWL/Item On-Time Barrier Attenuation Sub-total Total SWL Total SWL
(PME)     dB(A) % dB(A) SWL dB(A) dB(A) dB(A)
Lorry (mini) BS C.8, item 25 1 96 100%   96 98.1 98.12
Backfilling
Powered Mechanical Equipment Reference No. Items SWL/Item On-Time Barrier Attenuation Sub-total Total SWL Total SWL
(PME)     dB(A) % dB(A) SWL dB(A) dB(A) dB(A)
Compactor CNP 050 1 105.0 100% 5 100.0 100.0 100.00
Reinstating Road Surface
Powered Mechanical Equipment Reference No. Items SWL/Item On-time Barrier Attenuation Sub-total Total SWL Total SWL
Lorry (mini) BS C.8, item 25 1 96 100%   96    
Concrete mixer (electric) CNP 045 1 96 100%   96    
Air Compressor BS C.7, item 24 1 95 100%   95    
Vibratory poker, hand-held (Electric) BS 5228, Table C.6, item 40 1 98 100% 10 88 100.7 100.70
Note:
BS  BS5228 (1997) Part 1 Noise and Vibration Control on Construction and open sites
Submarine Outfall
Erection of Steel Working Platflorm
Powered Mechanical Equipment Reference No. Items SWL/Item On-time   Sub-total Total SWL Total SWL
(PME)     dB(A) %   SWL dB(A) dB(A) dB(A)
Setting up Steel Working Platform            
Air Compressor CNP 003 1 104 100%   104    
Percussion Drill rig, equiped with down the hole hammer CNP 072 1 110 100%   110    
Generator CNP101 1 108 100%   108    
Crane CNP 048 1 112 100%   112    
Barge CNP 016 1 104 100%   104 8.0 115.70
Grouting    
Generator CNP101 1 108 100%   108    
Grout Pump CNP 106 1 105 100%   105 4.0 109.76
Installation of Steel Casing in Rock      
Air Compressor CNP 003 1 104 100%   104    
Percussion Drill rig, equiped with ODEX CNP 072 1 110 100%   110 4.0 110.97
Erection of Scaffold
Powered Mechanical Equipment Reference No. Items SWL/Item On-time   Sub-total Total SWL Total SWL
(PME)     dB(A) %   SWL dB(A) dB(A) dB(A)
Generator CNP101 1 108 100%   108    
Vibrating Hammer CNP 172 1 115 100%   115    
Barge CNP 016 1 104 100%   104 5.8 116.07
Drilling and Installation of HDPE Pipeline
Powered Mechanical Equipment Reference No. Items SWL/Item On-time   Sub-total Total SWL Total SWL
(PME)     dB(A) %   SWL dB(A) dB(A) dB(A)
Horizontal Drilling System1 CNP 101 1 108 100%   108 5.8  
Direct-drive mixing system1 CNP 101 1 108 100%   108
Reclaimer2 CNP 282 1 103 100%   103
Note:
1   based on diesel generator
2   based on water pump
R2 - Commercially available quiet concrete demolition method in Hong Kong
Appendix 4.16
Assumed Operation Equipment for STW 
Powered Mechanical Equipment Reference No. Items SWL/Item Screening*   Sub-total Total SWL Total SWL
(PME)     dB(A) dB(A)   SWL dB(A) dB(A) dB(A)
Equalisation transfer pump CNP 283 1 85 10   75    
Effluent lift pump CNP 283 1 85 10   75    
Sludge recycling pump CNP 283 2 85 10   78    
Sludge wasty pump CNP 283 2 85 10   78    
Sludge pump CNP 283 1 85 10   75    
Air blower estimate1 1 102 10   92    
Filter press estimate1 1 94     94    
Deodouriser estimate1 1 79     79 18.6 96.49
Assumed Operation Equipment for Pumping Station P1a (With the Use of Silencer)
Powered Mechanical Equipment Reference No. Items SWL/Item Screening* Sub-total Total SWL Total SWL
(PME)     dB(A) dB(A) SWL dB(A) dB(A) dB(A)
Deodouriser1 R1 1 79 8 71 76.5 76.46
Note:
*      Assume 10 dB(A) noise reduction for equipment placing in enclosure/ 8 dB(A) reduction for the use of  silencer
1   Estimated SWLs of the equipment obtained from contractors
1      Based on fan with 1700m3/hr flowrate z
R1   Good Practices on Ventilation System Noise Control (EPD)
*  Use of manual working in areas where the worksites of the proposed sewer are located less than 20 m from the nearby residential NSRs and 30 m from the temple and library