Newlands Cross Upgrade EIS - European Investment Bank

South Dublin County Council N7 Newlands Cross Upgrade
Environmental Impact Statement
Arup Consulting Engineers
Table 3.4: Predicted Noise Levels for Years 2010 and 2025 for 'Do-Minimum' and 'Do-Something
- Underpass' Scenarios
Receiver
Location
Overpass:
Opening Year 2010 Design Year 2025
Predicted Noise Level Predicted Noise Level
Do
Do Mitigation Do
Do Mitigation
Minimum Something Required? Minimum Something Required?
Lden
Lden
R01 76 75 No 76 76 No
R02 75 75 No 76 76 No
R03 69 69 No 69 69 No
R04 68 68 No 68 68 No
R05 68 66 No 69 66 No
R06 69 67 No 70 68 No
R07 69 67 No 69 67 No
R08 72 71 No 73 71 No
R09 69 69 No 70 69 No
R10 73 70 No 74 70 No
R11 70 68 No 71 68 No
R12 69 67 No 70 67 No
R13 69 67 No 70 68 No
R14 70 67 No 70 68 No
R15 64 62 No 65 63 No
R16 72 70 No 72 70 No
R17 72 71 No 73 71 No
R18 72 71 No 73 71 No
R19 72 70 No 73 71 No
R20 70 69 No 71 69 No
R21 67 65 No 68 66 No
R22 68 67 No 69 67 No
R23 68 66 No 69 66 No
R24 69 67 No 70 68 No
R25 68 66 No 69 67 No
The combined expected maximum traffic noise level from the proposed overpass scheme
together with other traffic in the vicinity (i.e. Do Something – Overpass scenario) is greater
than 60dB Lden at all twenty-five of the receptors assessed.
The Do Something levels for twenty of these receptors is less than or equal to the predicted
Do Nothing levels. Therefore Condition (b) of the Design Goals (refer to Section 3.8.1.3.2) is
not satisfied and no mitigation measures are required at these receptors.
Mitigation measures will be required for the remaining five receptor groups (i.e. R03, R04,
R05, R06 and R07).
The proposed mitigation for Locations R03, R04, R05, R06 and R07 consists a 1.5m high and
325m long barrier along the northern side of the N7 overpass. Barriers should be constructed
in accordance with the NRA Guidance Document ‘Manual of Contract Documents for Road
Works 4 .
Lden
Lden
December 2007 Page 30