| Appendix 4.2 Construction Noise Impact Assessment | ||||||||||||
| (B1) Calculation of Construction Noise Levels at Representative Noise Sensitive Receivers - Unmitigated | ||||||||||||
| 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 | 116 | 14 | 88 | 88 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 110 | 14 | 82 | 82 | - | - | - | - | - | - | |
| C | Backfilling | 108 | 14 | 80 | 80 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 116 | 14 | 89 | 89 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | ||||||||||||
| A | Foundation | 124 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 124 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | - | - | - | - | - | - | - | - | - | |
| 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 | 116 | 24 | 84 | 84 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 110 | 24 | 77 | 77 | - | - | - | - | - | - | |
| C | Backfilling | 108 | 24 | 75 | 75 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 116 | 24 | 84 | 84 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | - | - | - | - | - | |||||||
| A | Foundation | 124 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 124 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | - | - | - | - | - | - | - | - | - | |
| 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 | 116 | 13 | 89 | 89 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 110 | 13 | 83 | 83 | - | - | - | - | - | - | |
| C | Backfilling | 108 | 13 | 81 | 81 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 116 | 13 | 90 | 90 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | - | - | - | - | - | |||||||
| A | Foundation | 124 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 124 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | - | - | - | - | - | - | - | - | - | |
| NSR: "LWT2" | ||||||||||||
| 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 | 116 | 34 | 81 | 81 | - | - | 83 | 83 | 83 | 81 | |
| B | Installation of Pipes and Bedding | 110 | 34 | 74 | 74 | - | - | 81 | 81 | 81 | 75 | |
| C | Backfilling | 108 | 34 | 73 | 73 | - | - | 80 | 80 | 80 | 74 | |
| D | Reinstating Road Surface | 116 | 34 | 81 | 81 | - | - | 83 | 83 | 83 | 81 | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | 99 | 80 | - | 80 | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | ||||||||||||
| A | Foundation | 124 | 99 | 80 | - | - | 80 | - | - | - | - | |
| B | Superstructural Works | 124 | 99 | 80 | - | - | 80 | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | 99 | 69 | - | - | 69 | - | - | - | - | |
| NSR: "LWT3" | ||||||||||||
| 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 | 116 | 128 | 10 | 59 | 59 | - | - | 85 | 85 | 85 | 75 |
| B | Installation of Pipes and Bedding | 110 | 128 | 10 | 53 | 53 | - | - | 85 | 85 | 85 | 75 |
| C | Backfilling | 108 | 128 | 10 | 51 | 51 | - | - | 85 | 85 | 85 | 75 |
| D | Reinstating Road Surface | 116 | 128 | 10 | 59 | 59 | - | - | 85 | 85 | 85 | 75 |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | 51 | 85 | - | 85 | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | ||||||||||||
| A | Foundation | 124 | 51 | 85 | - | - | 85 | - | - | - | - | |
| B | Superstructural Works | 124 | 51 | 85 | - | - | 85 | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | 51 | 75 | - | - | 75 | - | - | - | - | |
| * As the receiver's line of sight to the water main works would be blocked by first and second layer of the other buildings and the topographic effect, noise attenuation of 10 dB(A) | ||||||||||||
| have been considered in the assessment. | ||||||||||||
| NSR: "ALWT1" | ||||||||||||
| 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 | 116 | 64 | 75 | 75 | - | - | 81 | 81 | 81 | 76 | |
| B | Installation of Pipes and Bedding | 110 | 64 | 69 | 69 | - | - | 80 | 80 | 80 | 72 | |
| C | Backfilling | 108 | 64 | 67 | 67 | - | - | 80 | 80 | 80 | 71 | |
| D | Reinstating Road Surface | 116 | 64 | 75 | 75 | - | - | 81 | 81 | 81 | 76 | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | 98 | 80 | - | 80 | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | ||||||||||||
| A | Foundation | 124 | 98 | 80 | - | - | 80 | - | - | - | - | |
| B | Superstructural Works | 124 | 98 | 80 | - | - | 80 | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | 98 | 69 | - | - | 69 | - | - | - | - | |
| NSR: "ALWT2" | ||||||||||||
| 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 | 116 | 32 | 81 | 81 | - | - | 82 | 82 | 82 | 81 | |
| B | Installation of Pipes and Bedding | 110 | 32 | 75 | 75 | - | - | 79 | 79 | 79 | 75 | |
| C | Backfilling | 108 | 32 | 73 | 73 | - | - | 78 | 78 | 78 | 74 | |
| D | Reinstating Road Surface | 116 | 32 | 81 | 81 | - | - | 83 | 83 | 83 | 81 | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | 137 | 77 | - | 77 | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | ||||||||||||
| A | Foundation | 124 | 137 | 77 | - | - | 77 | - | - | - | - | |
| B | Superstructural Works | 124 | 137 | 77 | - | - | 77 | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | 137 | 66 | - | - | 66 | - | - | - | - | |
| (B2) Calculation of Construction Noise Levels at Representative Noise Sensitive Receiver BOS (during examination period) - Unmitigated | ||||||||||||
| 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 | 110 | 24 | 77 | 77 | - | - | - | - | - | - | |
| B | Installation of Pipes and Bedding | 109 | 24 | 77 | 77 | - | - | - | - | - | - | |
| C | Backfilling | 108 | 24 | 75 | 75 | - | - | - | - | - | - | |
| D | Reinstating Road Surface | 116 | 24 | 83 | 83 | - | - | - | - | - | - | |
| (II) Demolishment of Pui O Raw Water Pumping Station | ||||||||||||
| A | General Site Clearance / Demolition Works | 125 | - | - | - | - | - | - | - | - | - | |
| (III) Construction of Pui O Raw Water Pumping Station | - | - | - | - | - | |||||||
| A | Foundation | 124 | - | - | - | - | - | - | - | - | - | |
| B | Superstructural Works | 124 | - | - | - | - | - | - | - | - | - | |
| C | Installation of E&M Equipment and Commissioning & Testing | 114 | - | - | - | - | - | - | - | - | - | |
| List of Abbreviations: | ||||||||||||
| SWL - Sound Power Level | ||||||||||||
| CNL - Corrected Noise Level | ||||||||||||