| Appendix 4.2 Construction Noise Impact Assessment | ||||||||||||
| (F1) Calculation of Construction Noise Levels at Representative Noise Sensitive Receivers - Mitigated (Quite Plant+Barrier) | ||||||||||||
| NSR: "LUT" | ||||||||||||
| SWL | Distance | B.C.* | CNL | Cumulative Activities | ||||||||
| Activity | (dB(A)) | (m) | (dB(A)) | (dB(A)) | (I) | (II) | (III) | (I)+(II) | (I)+(III)A | (I)+(III)B | (I) + (III)C | |
| (I) Water Mains Construction | ||||||||||||
| A | Excavation of Trench / Breaking up Pavement | 102 | 14 | 74 | 74 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 98 | 14 | 71 | 71 | - | - | - | - | - | - | |
| C | Backfilling | 98 | 14 | 70 | 70 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 99 | 14 | 71 | 71 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 114 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | ||||||||||||
| A | Foundation | 113 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 112 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 102 | - | - | - | - | - | - | - | - | - | |
| NSR: "BOS" (During Normal Teaching Period) | ||||||||||||
| SWL | Distance | B.C.* | CNL | Cumulative Activities | ||||||||
| Activity | (dB(A)) | (m) | (dB(A)) | (dB(A)) | (I) | (II) | (III) | (I)+(II) | (I)+(III)A | (I)+(III)B | (I) + (III)C | |
| (I) Water Mains Construction | ||||||||||||
| A | Excavation of Trench / Breaking up Pavement | 102 | 24 | 70 | 70 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 98 | 24 | 66 | 66 | - | - | - | - | - | - | |
| C | Backfilling | 98 | 24 | 65 | 65 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 99 | 24 | 66 | 66 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 114 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | - | - | - | - | - | |||||||
| A | Foundation | 113 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 112 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 102 | - | - | - | - | - | - | - | - | - | |
| NSR: "LWT1" | ||||||||||||
| SWL | Distance | B.C.* | CNL | Cumulative Activities | ||||||||
| Activity | (dB(A)) | (m) | (dB(A)) | (dB(A)) | (I) | (II) | (III) | (I)+(II) | (I)+(III)A | (I)+(III)B | (I) + (III)C | |
| (I) Water Mains Construction | ||||||||||||
| A | Excavation of Trench / Breaking up Pavement | 102 | 13 | 75 | 75 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 98 | 13 | 72 | 72 | - | - | - | - | - | - | |
| C | Backfilling | 98 | 13 | 71 | 71 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 99 | 13 | 72 | 72 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 114 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | - | - | - | - | - | |||||||
| A | Foundation | 113 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 112 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 102 | - | - | - | - | - | - | - | - | - | |
| (F2) Calculation of Construction Noise Levels at Representative Noise Sensitive Receiver BOS (during examination period) | ||||||||||||
| - Mitigated (Quite Plant+Barrier) | ||||||||||||
| NSR: "BOS" | ||||||||||||
| SWL | Distance | B.C.* | CNL | Cumulative Activities | ||||||||
| Activity | (dB(A)) | (m) | (dB(A)) | (dB(A)) | (I) | (II) | (III) | (I)+(II) | (I)+(III)A | (I)+(III)B | (I) + (III)C | |
| (I) Water Mains Construction | ||||||||||||
| A | Excavation of Trench / Breaking up Pavement | 97 | 24 | 64 | 64 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 97 | 24 | 64 | 64 | - | - | - | - | - | - | |
| C | Backfilling | 98 | 24 | 65 | 65 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 97 | 24 | 65 | 65 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 114 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | - | - | - | - | - | |||||||
| A | Foundation | 113 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 112 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 102 | - | - | - | - | - | - | - | - | - | |
| List of Abbreviations: | ||||||||||||
| SWL - Sound Power Level | ||||||||||||
| CNL - Corrected Noise Level | ||||||||||||