Appendix 4.2     
Assumed Powered Mechanical Equipment for Sewer Construction (Unmitigated)
Breaking up pavement
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)
Circular saw CNP 201 2 108 100% 111    
Air Compressor CNP 002 2 102 100% 105    
Hand-held breaker CNP 024 2 108 100% 111 114.5 114.53
Excavation of Trench
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)
Excavator (mini) BS C.3, item 108 2 97 100% 100    
Hand-held breaker CNP 024 2 108 100% 111    
Air Compressor CNP 002 2 102 100% 105    
Lorry (mini) BS C.8, item 25 2 96 100% 99 112.5 112.45
Installation of Pipes and Bedding
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)
Mobile crane (mini) BS C.7, item 118 2 99 100% 102    
Lorry (mini) BS C.8, item 25 2 96 100% 99 103.8 103.77
Backfilling
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)
Compactor CNP 050 2 105.0 100% 108.0 108.0 108.01
Reinstating Road Surface
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)
Lorry (mini) BS C.8, item 25 2 96 100% 99    
Concrete mixer (electric) CNP 045 2 96 100% 99    
Air Compressor CNP 002 2 102 100% 105    
Vibratory poker hand-held CNP 170 2 113 100% 116 116.5 116.50
Note:
BS  BS5228 (1997) Part 1 Noise and Vibration Control on Construction and open sites