Appendix 4.9a
Predicted Noise Levels from Construction of  Pumping Station P1a (With the Use of Quiet Equipment and Temporary Noise Barrier)
Pumping Station P1a
Sensitive receiver Distance from Construction Activities,      m Foundation Superstructural Works
Excavation, dB(A) Formwork, reinforcement & fixing, dB(A) Concreting, dB(A) Backfilling, dB(A) Formwork, reinforcement & fixing, dB(A) Concreting, dB(A)
SWL 110.7 102.5 106.3 108.0 102.5 106.3
    110.72 102.53 106.258 108.01 102.53 106.26
CMV1 60 65.1 56.9 60.7 62.4 56.9 60.7
CMV2 24 73.1 64.9 68.7 70.4 64.9 68.7
CMV3* 66 54.3 46.1 49.9 51.6 46.1 49.9
CMV4 52 66.4 58.2 62.0 63.7 58.2 62.0
CMV5 46 67.4 59.2 63.0 64.7 59.2 63.0
CMV6 30 71.2 63.0 66.8 68.5 63.0 66.8
THT 204 54.5 46.3 50.1 51.8 46.3 50.1
SKW1 240 53.1 44.9 48.7 50.4 44.9 48.7
SKW2 266 52.2 44.0 47.8 49.5 44.0 47.8
SKW3 -- -- -- -- -- -- --
SKW4 -- -- -- -- -- -- --
SKW5 -- -- -- -- -- -- --
SKW6 -- -- -- -- -- -- --
SKW7* 250 42.7 34.5 38.3 40.0 34.5 38.3
SKW8* 300 41.2 33.0 36.8 38.5 33.0 36.8
SKW9 -- -- -- -- -- -- --
SKW10 -- -- -- -- -- -- --
SKW11 -- -- -- -- -- -- --
SKW12 -- -- -- -- -- -- --
TSW1 -- -- -- -- -- -- --
TSW2 -- -- -- -- -- -- --
TSW3 -- -- -- -- -- -- --
TSW4 -- -- -- -- -- -- --
MTW1 -- -- -- -- -- -- --
MTW2 -- -- -- -- -- -- --
Note: 3 dB(A) facade effect was added in the calculation
 --  The noise level at this particular NSR is negligible as it is more than 300m away from the construction activity.
*  Assumed 10dB(A) noise attenuation for NSR which would be totally screened from construction activity
Boldface indicate an exceedance of the noise criteria of 75dB(A) for residential uses and 70 dB(A) for temple and library