Table 4.9          Cumulative Operational Noise Levels at Representative NSRs (With the Installation of Silencer)

Sensitive receiver

Distance between Noise Source and NSR, m

Single Noise Level, dB(A)

Cumulative Noise Level, dB(A)

P1a

P1b

P2

P1a

P1b

P2

CMV1

60

130

--

35.9

33.2

--

38

CMV2

24

92

--

43.9

36.2

--

45

CMV3

66

104

--

35.1

35.2

--

38

CMV4

52

52

--

37.2

41.2

--

43

CMV5

46

92

--

38.2

36.2

--

40

CMV6

30

96

--

42.0

35.9

 

43

THT

204

128

--

25.3

33.4

--

34

SKW1

240

170

--

23.9

30.9

--

32

SKW2

266

182

288

23.0

30.3

26.3

32

SKW3

--

226

256

--

28.4

27.3

31

SKW4

--

272

212

--

26.8

29.0

31

SKW5

--

--

168

--

--

31.0

31

SKW6

--

--

130

--

--

33.2

33

SKW7

250

174

--

23.5

30.7

--

31

SKW8

300

222

260

22.0

28.6

27.2

31

SKW9

--

262

223

--

27.1

28.5

31

SKW10

--

--

140

--

--

32.6

33

SKW11

--

--

120

--

--

33.9

34

SKW12

--

--

103

--

--

35.2

35

TSW1

--

--

44

--

--

42.6

43

TSW2

--

--

118

--

--

34.1

34

TSW3

--

--

138

--

--

32.7

33

TSW4

--

--

188

--

--

30.0

30

Note:

Criteria: 55dB(A) (0700-2300 hrs); 45dB(A) (2300-0700 hrs)

3 dB(A) facade effect was added in the calculation

‘--'  Not applicable because NSR would be over 300m from the construction activities, unoccupied or unaffected Boldface indicate an exceedance of the noise criterion of 45dB(A)