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Kitty Wang |
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F. C. Tsang |
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Content
2.2 Monitoring Locations, Parameters and Frequency
2.5 Baseline Monitoring Result
3 Construction Noise Monitoring
3.2 Monitoring Locations, Parameters and Frequency
3.4 Noise Monitoring Methodology
3.5 Baseline Monitoring Result
3.6 Maintenance and Calibration
3.7 Action and Limit Level for Construction Noise
4.2 Monitoring Locations, Parameters, Frequency and Duration
4.5 Laboratory Measurement / Analysis
4.7 Baseline Monitoring Result
4.8 Action and Limit Level for Water Quality Monitoring
5.1 Revision for Inclusion in the EM&A Manual
Figures
Figure 1.1 Layout Plan of the Project
Figure 2.1 Air Quality Monitoring Locations of the Project (Overall)
Figure 3.1 Noise Monitoring Locations of the Project (Overall)
Figure 4.1 Water Quality Monitoring Locations of the Project (Overall)
Appendix
Appendix 1 Monitoring Schedule
Appendix 2 Calibration Certificates
Appendix 3 Baseline Monitoring Data
Appendix 3-1 Baseline Air Quality Monitoring Data
Appendix 3-2 Baseline Noise Monitoring Data
Appendix 3-2-1 Baseline Noise Monitoring Data at CM1
Appendix 3-2-2 Baseline Noise Monitoring Data at CM2
Appendix 3-2-3 Baseline Noise Monitoring Data at CM3
Appendix 3-2-4 Baseline Noise Monitoring Data at CM4a
Appendix 3-2-5 Baseline Noise Monitoring Data at CM9
Appendix 3-2-6 Baseline Noise Monitoring Data at CM10
Appendix 3-2-7 Baseline Noise Monitoring Data at CM11
Appendix 3-2-8 Baseline Noise Monitoring Data at CM12
Appendix 3-2-9 Baseline Noise Monitoring Data at CM13
Appendix 3-2-10 Baseline Noise Monitoring Data at CM14
Appendix 3-2-11 Baseline Noise Monitoring Data at CM15a
Appendix 3-2-12 Baseline Noise Monitoring Data at CM16
Appendix 3-2-13 Baseline Noise Monitoring Data at CM17a
Appendix 3-2-14 Baseline Noise Monitoring Data at CM18
Appendix 3-2-15 Baseline Noise Monitoring Data at CM19
Appendix 3-2-16 Baseline Noise Monitoring Data at CM20
Appendix 3-2-17 Baseline Noise Monitoring Data at CM21
Appendix 3-2-18 Baseline Noise Monitoring Data at CM22
Appendix 3-2-19 Baseline Noise Monitoring Data at CM23a
Appendix 3-2-20 Baseline Noise Monitoring Data at CM24
Appendix 3-2-21 Baseline Noise Monitoring Data at CM25
Appendix 3-2-22 Baseline Noise Monitoring Data at CM26
Appendix 3-2-23 Baseline Noise Monitoring Data at CM27a
Appendix 3-2-24 Baseline Noise Monitoring Data at CM28
Appendix 3-2-25 Baseline Noise Monitoring Data at CM29
Appendix 3-2-26 Baseline Noise Monitoring Data at CM30
Appendix 3-2-27 Baseline Noise Monitoring Data at CM31
Appendix 3-2-28 Baseline Noise Monitoring Data at CM32
Appendix 3-3 Baseline Water Quality Monitoring Data
Appendix 4 Graphical Presentations
Appendix 4-1 Baseline Air Quality Monitoring Results
Appendix 4-2 Baseline Noise Monitoring Results
Appendix 4-3 Baseline Water Quality Monitoring Results
Appendix 5 Extract of Wind Data from Shek Kong Automatic Weather Station
Appendix 6 Quality Control Summary Table
Executive SummaryAurecon Hong Kong Limited (Aurecon) is commissioned by Civil Engineering and Development Department (CEDD) to provide Environmental Monitoring and Audit (EM&A) services for the works contracts in relation to Hung Shui Kiu/Ha Tsuen New Development Area (HSK/HT NDA) Second Phase Development (the Project) pursuant to the requirements of Environmental Team (ET) as specified in relevant Environmental Permit (EP), the Updated EM&A Manual (Apr 2022) and/or the approved Environmental Impact Assessment (EIA) Report for the Project.
The EIA Report for Hung Shui Kiu New Development Area (HSK NDA) (Register No. AEIAR-203/2016) was approved with conditions under the EIA Ordinance on 15 December 2016. A total of six EPs associated with the designated projects within HSK/HT NDA (i.e. EP-531/2017, EP-530/2017, EP-529/2017, EP-528/2017, EP-527/2017 & EP-526/2017) were subsequently issued in February 2017. In addition, the EP for construction of four new sewage pumping stations (i.e. EP-526/2017) was surrendered on 13 November 2023.
In accordance with the requirements specified in the EPs and the EM&A Manual for the Project, a Baseline Monitoring Report (the Report) should be certified by the ET leader, verified by the Independent Environmental Checker (IEC) and submitted to the Director of Environmental Protection (DEP) before commencement of construction of the Project.
The baseline monitoring works included air quality monitoring (AQM), construction noise monitoring (CNM) and water quality monitoring (WQM). This Report presents the results of baseline AQM (during the period of 23 August to 24 October 2024), baseline CNM (during the period of 23 August to 17 October 2024) and baseline WQM (during the period of 16 September to 12 October 2024) by which the Action Level (AL) and Limit Level (LL) for each monitoring parameter are determined with statistical analysis and review of the data retrieved during the baseline monitoring periods.
The landscape and visual
(L&V) baseline as referred to the L&V materials relevant to works
contracts, including landscape resource maps, detailed tree surveys, field
surveys, site visits, etc., will be determined and reported in another set of
Baseline Monitoring Report solely for L&V which will be prepared and
submitted by batches subject to access date of site areas as agreed during the
discussion meeting with EPD held on 2 October 2024.
1.1.1 The HSK/HT NDA occupies an area of approximately 714 hectares and is located at the north-western part of the New Territories, midway between the Tuen Mun and Tin Shui Wai New Towns. The sites included scatted land pieces in the area near-by the proposed HSK Station, bounded by Castle Peak Road (Hung Shui Kiu) Castle Peak Road to the south, Kong Sham Western Highway to the west and Tin Shui Wai MTR Station. The HSK/HT NDA will provide associated engineering infrastructure and supply land for subsequent development of public and private housing, community facilities, commercial and industrial premises, the Green Transit Corridor (comprising the Environmentally Friendly Transport Services, footpaths and cycle tracks) and other uses, and for construction of the proposed infrastructure works such as district distributor roads, local roads, revitalisation of existing channels, sewerage (including pumping stations), drainage (including pumping stations), water supply, landscaping, electrical and mechanical (E&M), and associated works.
1.1.2 Currently, the HSK/HT NDA development will be implemented in three phases, comprising First Phase, Second Phase and Remaining Phase development. The First Phase development which comprises the site information and engineering infrastructure works under Advance Works Phases 1 and 2 and Stage 1 Works has commenced construction in 2020.
1.1.3 The HSK/HT NDA Advance Works Phase 3 and Stage 2 Works are collectively called Second Phase development (also known as HSK/HT NDA Second Phase Development the Project). The HSK/HT NDA Advance Works Phase 3 includes site formation and engineering infrastructure works for the site for Dedicated Rehousing Estate (DRE), residential and industrial uses and Government/Institution or Community (G/IC) developments. It also comprises construction of engineering infrastructure works, including a primary distributor road, district distributor roads, local roads, drainage, sewerage (including pumping stations), water supply, landscaping, E&M and associated works as environmental mitigation measures and EM&A programme. The HSK/HT NDA Stage 2 Works includes site information and engineering infrastructure works for the commercial, residential and G/IC developments in the proposed town centre around the proposed HSK Station, logistics, industrial corporate and technology zones village resite, and the remaining batch of multi-storey buildings.
1.1.4 The Project will be delivered under seven works contracts as below and the general layout plan of the works contracts, except Contract 7 of which the exact extent and scope of works are subject to review, is shown in Figure 1.1.
Contract 1
· Site clearance and formation (including land decontamination works) for about 30 hectares of lands, together with provision of associated engineering infrastructure
· Construction of Local Roads L6, L7 and L8
· Construction of associated works including footpaths, cycle tracks, drainage, sewerage, landscaping works and other ancillary works
· Relocation and provision of Community Liaison Centre (CLC)
· Implementation of environmental mitigation measures (including noise barriers and low-noise road surfacing)
Contract 2
· Site clearance and formation for about 8.5 hectares of lands
· Construction of Tan Kwai Tsuen East Fresh Water Service Reservoir and associated roadworks, power supply and landscaping works
· Laying of about 4.5 km long freshwater mains and about 3.5 km long flushing water mains
· Implementation of environmental mitigation measures and related environmental monitoring and audit programme for the works mentioned above
Contract 3
· Site clearance and formation (including land decontamination works) for about 60 hectares of lands, together with provision of associated engineering infrastructure
· Construction of Roads D6, D8, L5, L9, L10, L12, L13, L14, L15, L16, road connection between Road P1 and D6 and road connection between Road P1 and Castle Peak Road and relocation of parking area of MTR Emergency Access Point (EAP) 26 in Tuen Mun
· Construction of Footbridge FB13
· Construction of Underpass UP1
· Realignment of Tin Sam Channel
· Construction of Sewage Pumping Station SPS1
· Construction of associated works including footpaths, cycle tracks, drainage, sewerage, water supply, box culvert, district cooling mains, Common Utility Tunnel, landscaping, E&M works and other ancillary works
· Implementation of environmental mitigation measures (including noise barriers and low-noise road surfacing)
Contract 4
· Site clearance and formation (including land decontamination works) for about 57 hectares of lands, together with provision of associated engineering infrastructure
· Construction of Roads D6, D7, L1, L17, L18, L21, L22, L23, L25 and L35
· Construction of river crossing footbridge FB5, FB9, FB8, FB8A, FB8B, FB8C and FB10 and Pedestrian Subway SW6
· River Revitalisation of Tin Sam Channel
· Construction of Sewage Pumping Station SPS3
· Construction of associated works including footpaths, cycle tracks, drainage, sewerage, water supply, box culvert, district cooling mains, landscaping, E&M works and other ancillary works
· Implementation of environmental mitigation measures (including noise barriers and low noise road surfacing)
Contract 5
· Site clearance and formation (including land decontamination works) for about 38 hectares of lands, together with provision of associated engineering infrastructure
· Construction of northern portion of Road P1 and the associated highway connections including the viaducts structures
· Construction of Roads D1, L19, L24, L32, L33 and L36
· Construction of footbridges and pedestrian subways
· Construction of Sewage Pumping Station SPS2
· Slope and natural terrain hazard mitigation works to the hillsides adjacent to Road P1
· Construction of associated works including footpaths, cycle tracks, drainage, sewerage, water supply, district cooling mains, landscaping, E&M works and ancillary works
Contract 6
· Site clearance and formation (including land decontamination works) for about 70 hectares of lands, together with provision of associated engineering infrastructure
· Construction of Roads D3, D5, L30 and L31 and associated connections
· Construction of Sewage Pumping Station SPS4
· Construction of floodable open spaces and the associated drainage works
· Construction of associated works including footpaths, cycle tracks, drainage, sewerage, water supply, landscaping, E&M works and ancillary works
Contract 7
· All remaining landscaping works to regional, district and local open space, landscape within the streetscape, landscape to the floodable open spaces and landscape to river revitalization or polder areas
1.1.5 Aurecon was commissioned by CEDD to provide EM&A services for the works contracts in relation to the Project pursuant to the requirements as specified in relevant EP, the Updated EM&A Manual (Apr 2022) and the approved EIA Report for the Project to discharge the duties of the ET for the Project, including the baseline monitoring works for various monitoring parameters (e.g. AQM, CNM, WQM, etc.).
1.1.6 In accordance with Condition 3.3 of the EPs (i.e. EP-531/2017, EP-530/2017, EP-529/2017, EP-528/2017 & EP-527/2017) for the Project, the Baseline Monitoring Report certified by the ET Leader and verified by the IEC shall be submitted to the DEP at least two weeks before commencement of construction of the Project.
1.2 Purpose of this Report
1.2.1 The purpose of the Baseline Monitoring Report is to establish the baseline levels for air quality, construction noise and water quality. These baseline levels will be used as the basis for compliance check during the impact monitoring in construction stage of the Project.
1.2.2 This Report presents the findings of the baseline AQM conducted between 23 August and 24 October 2024, the baseline CNM conducted between 23 August and 17 October 2024, and baseline WQM conducted between 16 September and 12 October 2024. The Report includes information on the monitoring methodology, parameters, locations, periods (e.g. date, time, frequency & duration), results, and other observations (e.g. influencing factors, etc.) for AQM, CNM and WQM during the baseline monitoring periods.
1.3 Structure of the Report
n Section 1 Introduction
n Section 2 Air Quality Monitoring
n Section 3 Construction Noise Monitoring
n Section 4 Water Quality Monitoring
2 Air Quality Monitoring 2.1 Monitoring Requirement
2.1.1 In accordance with the Updated EM&A Manual (Apr 2022), there are 25 designated and alternative air quality monitoring locations. Baseline monitoring was carried out at 19 designated and alternative monitoring locations under this Project. Baseline monitoring was conducted to determine the ambient 1-hour total suspended particulates (1-hour TSP) levels at the monitoring stations where no construction or dust generating activities was present in the vicinity for at least 14 consecutive days prior to the commencement of the Project. 1-hour TSP sampling was carried out at least three times per day at the monitoring stations when the highest dust impacts are expected.
2.2 Monitoring Locations, Parameters and Frequency
2.2.1 According to the Updated EM&A Manual (Apr 2022), baseline monitoring was carried out at 19 designated and alternative monitoring locations near the construction area from Contract 1 to Contract 6 under this Project.
2.2.2 The Proposal for Alternative Monitoring Locations (Air Quality) for baseline monitoring had been certified by the ET Leader and received no comments from the IEC. The monitoring station AM8 as shown in Table 4.1 and Figure 4.1 of the Updated EM&A Manual (Apr 2022) should read as Block J of Ting Shing Court which faced directly to the construction sites of the Project. On the other hand, Block H as quoted in Table 4.1 of the Updated EM&A Manual (Apr 2022) in fact was surrounded by the housing blocks of the same height. Therefore, the alternative station at AM8a was renamed as Block J, Tin Shing Court by the ET and agreed by the IEC and Engineers Representative (ER) according to Section 4.4.2 of the Updated EM&A Manual (Apr 2022) prior to the baseline monitoring. However, as the Owners Corporation for Tin Shing Court refused to grant the permission to access to carry out the set-up of monitoring equipment at the proposed location for subsequent impact monitoring period, a new location has been then identified and submitted through the proposal of the alternative monitoring location for the impact monitoring. As agreed by IEC, the baseline air quality monitoring is not required to be re-carried out at the new alternative location of AM8a as it is at a short distance from the original location (25m), which is still representative for the air sensitive receiver. The air quality monitoring locations are summarized in Table 2-1 and depicted in Figure 2.1.
Table 2‑1 Air Quality Monitoring Locations
|
Monitoring Station(s) |
EIA ID |
Monitoring Location |
|
AM1 |
A204 |
Kam Cheong Garden |
|
AM2 |
A208 |
Oaklands Court |
|
AM3 |
A209 |
Ling Liang Church Primary School |
|
AM4 |
A310 |
Tin Ha Road Playground |
|
AM5 |
A415 |
Tin Sum Tsuen |
|
AM6 |
A410 |
Galore Garden |
|
AM7 |
A414 |
Shek Po Tusen |
|
AM8a (2)(3) |
A813 |
Block J, Tin Shing Court |
|
AM9 |
A702 |
San Uk Tsuen |
|
AM10 |
A802 |
Kiu Tau Wai |
|
AM11 |
A703 |
Sha Chau Lei Tsuen |
|
AM12 |
A704 |
Ha Tsuen Shi |
|
AM13 |
A708 |
Sik Kong Wai |
|
AM14 |
A601 |
Tseung Kong Wai |
|
AM15 |
A1101 |
Lo Uk Tsuen |
|
AM16 |
A1103 |
Block 8, Locwood Court |
|
AM17 |
A1106 |
Shui Lung House, Tin Shui Estate |
|
AM18 (1) |
A1303 |
Sha Kong Wai Tsai |
|
AM19 (1) |
A1305 |
Ngau Hom Tsuen |
|
AM20 (1) |
A1302 |
Wing Jan School |
|
AM21 |
A1002 |
Fung Kong Tsuen |
|
AM22 |
P240 |
Planned Village Resite at Site 4-20 |
|
AM23 (4) |
P1032 |
Planned Port Back-up, Storage and Workshop at Site 3-6 |
|
AM24 (4) |
P1501 |
Planned Port Back-up, Storage and Workshop at Site 3-8 |
|
AM25a (4) |
- |
San Wai Sewage Treatment Works |
Notes:
(1) As AM18 (Sha Kong Wai Tsai), AM19 (Ngau Hom Tsuen), and AM20 (Wing Jan School) are more than 500 m away from the nearest site boundary of the works contract under this Project. Neither baseline nor impact monitoring is proposed at these monitoring stations for the Project.
(2) The correct name of the monitoring location had been updated as proposed in the Proposal for Alternative Monitoring Locations (Air Quality, Construction Noise & Water Quality) with agreement from the IEC, and the monitoring station ID had been revised from AM8 to AM8a.
(3) For AM8a, the monitoring station AM8 as shown in Table 4.1 and Figure 4.1 of the Updated EM&A Manual (Apr 2022) should read as Block J of Ting Shing Court which faced directly to the construction sites of the Project. On the other hand, Block H as quoted in Table 4.1 of the Updated EM&A Manual (Apr 2022) in fact was surrounded by the housing blocks of the same height. Furthermore, as the Owners Corporation for Tin Shing Court refused to grant the permission to access to carry out the set-up of monitoring equipment at the proposed location for subsequent impact monitoring period, a new location has been then identified and submitted through the proposal of the alternative monitoring location for the impact monitoring. As agreed by IEC, the baseline air quality monitoring is not required to be re-carried out at the new alternative location of AM8a as it is at a short distance from the original location (25m), which is still representative for the air sensitive receiver.
(4) Baseline monitoring at AM23, AM24 and AM25a had been conducted under the baseline air quality monitoring of HSK/HT NDA Stage 1 Works in December 2021. No further baseline monitoring at these stations is proposed for the Project.
2.2.3 Baseline air quality monitoring was conducted between 23 August 2024 and 5 September 2024 at the four monitoring locations at AM1, AM2, AM7 and AM9. Baseline air quality monitoring was conducted at AM3, AM4, AM5, AM6, AM8a, AM10, AM11 and AM12 between 13 September and 26 September 2024. Baseline air quality monitoring was conducted at AM22 between 14 September and 27 September 2024. Baseline air quality monitoring was conducted at AM13, AM14, AM15, AM17 and AM21 between 27 September and 10 October 2024. Baseline air quality monitoring was conducted at AM16 between 11 October 2024 and 24 October 2024. The detailed monitoring schedule is shown in Appendix 1. The frequency and duration are shown in Table 2-2.
Table 2‑2 Baseline Air Quality Monitoring Parameters, Frequency and Duration
|
Monitoring Station |
Parameter |
Frequency and Duration |
|
AM1, AM2, AM3, AM4, AM5, AM6, AM7, AM8a, AM9, AM10, AM11, AM12, AM13, AM14, AM15, AM16, AM17, AM21, AM22 |
1-hour TSP |
Daily for 14 consecutive days; 3 times per day |
2.3.1 Direct reading dust meters were used for measuring 1-hour TSP levels during the baseline air quality monitoring. According to paragraph 4.3.5 the Updated EM&A Manual (Apr 2022), the proposed use of direct reading dust meter was submitted to and agreed by the IEC.
2.3.2 The direct reading dust meters have been calibrated against high volume samplers (HVSs) annually. A 2-day, three 3-hour measurement results per day from direct reading dust meters were taken to compare with the sampling results from the HVSs. The correlation between the direct reading dust meters and the HVSs were then concluded. By accounting for the correlation factor, the direct reading dust meters are considered to achieve comparable results as that of the HVSs.
2.3.3 Sufficient number of monitoring instruments were deployed by the ET for carrying out the baseline monitoring. All equipment and associated instrumentation were clearly labelled.
2.3.4 Equipment used in the baseline air quality monitoring programme is summarized in Table 2-3. Calibration certificates for the air quality monitoring equipment are attached in Appendix 2.
Table 2‑3 Baseline Air Quality Monitoring Equipment
|
Equipment |
Manufacturer |
Model |
No. of Sets of Equipment |
Serial No. |
|
Direct Reading Dust Meter |
Sibata |
LD-5R |
12 |
467356, 467357, 467358, 467359, 467360, 467361, 0Z4545, 851816, 882106, 882107, 882150, 942532 |
2.4.1 The 1-hr TSP was sampled by drawing air into the portable dust monitor where particular concentrations were measured instantaneously with an in-built silicon detector sensing light scattered by the particulates in the sampled air. Continuous TSP levels were indicated and logged by a built-in data logger compatible with Windows based program to facilitate data collection, analysis and reporting.
2.4.2 The measuring procedures of the 1-hour dust meter was undertaken in accordance with the Manufacturers Instruction Manual as follows:
Placed the 1-hour dust meter at least 1.5m above ground;
Set POWER to ON and make sure that the battery level was not flashed or in low level;
Pulled the air sampling inlet cover up;
Pushed the knob at MEASURE position;
Set time/mode setting to [BG] by pushing the time setting switch. Then, started the background measurement by pushing the start/stop switch once. It took 6 sec. to complete the background measurement;
Turned knob to SENSI. ADJ position and pressed in;
Pushed Start/Stop switch once;
Gently returned knob to the MEASURE position;
Pushed the time setting switch to change the time setting display to [LOG] at the bottom left of the liquid crystal display;
Removed the cap and started measurement; and
Information such as sampling date, time, count value and site condition were recorded during the monitoring period
2.5 Baseline Monitoring Result
2.5.1 Baseline monitoring for air quality was conducted between 23 August 2024 and 24 October 2024. The baseline air quality monitoring result are summarized in Table 2-4. Details of air quality results are presented in Appendix 3-1.
2.5.2 During the baseline monitoring, no construction activity or dust generating activities of the Project and any other projects was conducted in the vicinity of the monitoring locations and in the project site. No project or any other project was observed affecting the baseline air quality condition during the baseline monitoring.
2.5.3 No other major dust emission sources were noted. Weather condition of the whole baseline monitoring period varied from sunny to rainy. Wind data during the period of baseline monitoring from the Hong Kong Observatory Lau Fau Shan Wind Station (22.46889N, 113.98361E), which is located about 1.25 km from the nearest site boundary of Contract 6, are also presented in Appendix 5.
Table 2-4 Summary of Baseline 1-hour TSP Monitoring Results
|
Monitoring Station (s) |
TSP Concentration, μg/m3 |
||
|
Average |
Min. |
Max. |
|
|
AM1 - Kam Cheong Garden |
24 |
15 |
33 |
|
AM2 - Oaklands Court |
32 |
20 |
46 |
|
AM3 - Ling Liang Church Primary School |
35 |
19 |
56 |
|
AM4 - Tin Ha Road Playground |
28 |
17 |
48 |
|
AM5 - Tin Sum Tsuen |
34 |
12 |
61 |
|
AM6 - Galore Garden |
32 |
21 |
54 |
|
AM7 - Shek Po Tusen |
49 |
34 |
67 |
|
AM8a - Block J, Tin Shing Court |
26 |
13 |
54 |
|
AM9 - San Uk Tsuen |
39 |
20 |
61 |
|
AM10 - Kiu Tau Wai |
32 |
17 |
52 |
|
AM11 - Sha Chau Lei Tsuen |
39 |
22 |
60 |
|
AM12 - Ha Tsuen Shi |
35 |
18 |
58 |
|
AM13 - Sik Kong Wai |
21 |
11 |
42 |
|
AM14 - Tseung Kong Wai |
46 |
26 |
68 |
|
AM15 - Lo Uk Tsuen |
32 |
16 |
50 |
|
AM16 - Block 8, Locwood Court |
46 |
31 |
63 |
|
AM17 - Shui Lung House, Tin Shui Estate |
36 |
21 |
57 |
|
AM21 - Fung Kong Tsuen |
38 |
24 |
56 |
|
AM22 - Planned Village Resite at Site 4-20 |
37 |
19 |
58 |
2.6.1 The baseline 1-hour TSP monitoring results form the basis for determining the air quality criteria for the impact monitoring. Table 2-5 shows the criteria for establishing the Action and Limit Levels for air quality monitoring.
Table 2‑5 Action and Limit Levels for Air Quality during Construction Period
|
Parameter |
Action Level (µg/m3) (1) |
Limit Level (µg/m3) |
|
1-hour TSP Level |
BL ≤ 384 µg/m3, AL = (BL × 1.3 + LL)/2 BL > 384 µg/m3, AL = LL |
500 |
Notes:
(1) BL: Baseline Level; AL: Action Level; LL: Limit Level
2.6.2 Following the above guidelines, the Action and Limit Levels for 1-hour TSP impact monitoring have been set and presented in Table 2-6.
Table 2-6 Calculated Action and Limit Levels for 1-hour TSP
|
Monitoring Station(s) |
Action Level (µg/m3) |
Limit Level (µg/m3) |
|
AM1 |
266 |
500 |
|
AM2 |
271 |
|
|
AM3 |
273 |
|
|
AM4 |
268 |
|
|
AM5 |
272 |
|
|
AM6 |
271 |
|
|
AM7 |
282 |
|
|
AM8a |
267 |
|
|
AM9 |
276 |
|
|
AM10 |
271 |
|
|
AM11 |
276 |
|
|
AM12 |
273 |
|
|
AM13 |
264 |
|
|
AM14 |
280 |
|
|
AM15 |
271 |
|
|
AM16 |
280 |
|
|
AM17 |
273 |
|
|
AM21 |
275 |
|
|
AM22 |
274 |
2.6.3 Should non-compliance of the air quality criteria occur, action in accordance with the Action Plan in Table 2-7 shall be carried out.
2.7 Event and Action Plan
2.7.1 The Action and Limit levels for air quality are shown in Table 2-6. Should non-compliance of the criteria occur, action in accordance with the Event/ Action Plans in Table 2-7 shall be carried out.
Table 2-7 Event/ Action Plan for Air Quality
|
Event |
Action |
|||
|
ET |
IEC |
ER |
Contractor |
|
|
Action level being exceeded by one sampling |
1. Identify source, investigate the causes of complaint and propose remedial measures; 2. Inform Contractor, IEC and ER; 3. Repeat measurement to confirm finding; and 4. Increase monitoring frequency to daily. |
1. Check monitoring data submitted by ET; 2. Check Contractors working method; and 3. Review and advise the ET and ER on the effectiveness of the proposed remedial measures. |
1. Notify Contractor. |
1. Identify source(s), investigate the causes of exceedance and propose remedial measures; 2. Implement remedial measures; and 3. Amend working methods agreed with the ER as appropriate. |
|
Action level being exceeded by two or more consecutive sampling |
1. Identify source; 2. Inform Contractor, IEC and ER; 3. Advise the Contractor and ER on the effectiveness of the proposed remedial measures; 4. Repeat measurements to confirm findings; 5. Increase monitoring frequency to daily; 6. Discuss with IEC and Contractor on remedial actions required; 7. If exceedance continues, arrange meeting with Contractor, IEC and ER; and 8. If exceedance stops, cease additional monitoring. |
1. Check monitoring data submitted by ET; 2. Check Contractors working method; 3. Discuss with ET, ER and Contractor on possible remedial measures; 4. Advise the ET and ER on the effectiveness of the proposed remedial measures; and 5. Supervise Implementation of remedial measures. |
1. Confirm receipt of notification of exceedance in writing; 2. Notify Contractor; 3. Ensure remedial measures properly implemented by the Contractor; and 4. If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated. |
1. Identify source and investigate the causes of exceedance; 2. Submit proposals for remedial measures to the ER with a copy to ET and IEC within three working days of notification; 3. Implement the agreed proposals; and 4. Amend proposal as appropriate. |
|
Limit level being exceeded by one sampling |
1. Identify source, investigate the causes of exceedance and propose remedial measures; 2. Inform Contractor, IEC, ER, and EPD; 3. Repeat measurement to confirm finding; 4. Increase monitoring frequency to daily; and 5. Assess effectiveness of Contractors remedial actions and keep IEC, EPD and ER informed of the results. |
1. Check monitoring data submitted by ET; 2. Check Contractors working method; 3. Discuss with ET and Contractor on possible remedial measures; 4. Advise the ER on the effectiveness of the proposed remedial measures; and 5. Supervise implementation of remedial measures. |
1. Confirm receipt of notification of exceedance in writing; 2. Notify Contractor; 3. Ensure remedial measures properly implemented. |
1. Identify source(s) and investigate the causes of exceedance; 2. Take immediate action to avoid further exceedance; 3. Submit proposals for remedial measures to ER with a copy to ET and IEC within three working days of notification; 4. Implement the agreed proposals; and 5. Amend proposal if appropriate. |
|
Limit level being exceeded by two or more consecutive sampling |
1. Notify IEC, ER, Contractor and EPD; 2. Identify source; 3. Repeat measurement to confirm findings; 4. Increase monitoring frequency to daily; 5. Carry out analysis of Contractors working procedures to determine possible mitigation to be implemented; 6. Arrange meeting with IEC and ER to discuss the remedial actions to be taken; 7. Assess effectiveness of Contractors remedial actions and keep IEC, EPD and ER informed of the results; and 8. If exceedance stops, cease additional monitoring. |
1. Check monitoring data submitted by the ET; 2. Discuss amongst ER, ET, and Contractor on the potential remedial actions; 3. Review Contractors remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly; and 4. Supervise the implementation of remedial measures. |
1. Confirm receipt of notification of exceedance in writing; 2. In consultation with the ET and IEC, agree with the Contractor on the remedial measures to be implemented; 3. Supervise the implementation of remedial measures; and 4. If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated. |
1. Identify source(s) and investigate the causes of exceedance; 2. Take immediate action to avoid further exceedance; 3. Submit proposals for remedial measures to the ER with a copy to the IEC and ET within three working days of notification; 4. Implement the agreed proposals; 5. Revise and resubmit proposals if problem still not under control; and 6. Stop the relevant portion of works as determined by the ER until the exceedance is abated. |
3 Construction Noise Monitoring
3.1 Monitoring Requirement
3.1.1 In accordance with the Updated EM&A Manual (Apr 2022), there are 32 designated and alternative noise monitoring locations. Baseline monitoring was carried out at 28 designated and alternative monitoring locations for at least 2 weeks prior to the commissioning of the construction works under this Project. The minimum logging interval shall be 30 minutes with average of 6 consecutive A-weighted equivalent continuous sound pressure level over 5 minutes (Leq(5mins)); L10 and L90 shall also be measured at 5-minute intervals.
3.2 Monitoring Locations, Parameters and Frequency
3.2.1 According to the Updated EM&A Manual (Apr 2022), baseline monitoring was conducted at 28 designated and alternative monitoring locations near the construction area from Contract 1 to Contract 6 under this Project.
3.2.2 The Proposal for Alternative Monitoring Locations (Noise) had been certified by the ET Leader and had no adverse comments from the IEC. Due to limited access to the original monitoring locations at CM4, CM15, CM17, CM23 and CM27, alternative stations at CM4a, CM15a, CM17a, CM23a and CM27a were proposed by the ET and agreed by the IEC and Engineers Representative (ER) according to the Updated EM&A Manual (Apr 2022) prior to the baseline monitoring. The noise monitoring locations are summarized in Table 3-1 and depicted in Figure 3.1.
Table 3‑1 Noise Monitoring Locations
|
ID No. |
EIA ID |
Location |
Nature of Uses |
Type of Measurement |
|
CM1(3) |
ETCW02 |
No. 739, Oaklands Court |
Residential |
Free-Field |
|
CM2 (3) |
ESFW01 |
No. 332, Chung Uk Tsuen |
Residential |
Free-Field |
|
CM3 (3) |
ESFW02 |
Village house, Nai Wai |
Residential |
Free-Field |
|
CM4a (2) (3) |
|
Village Representative Building at Chung Uk Tsuen |
Residential |
Free-Field |
|
CM5 (1) |
ELFS02 |
No. 3H, San Hing Tsuen |
Residential |
- |
|
CM6 (1) |
ELFS03 |
No. 310, Sha Kong Wai |
Residential |
- |
|
CM7 (1) |
ELFS04 |
Wing Jan School/Wing Jan Lutheran Church |
Educational Institution |
- |
|
CM8 (1) |
ETSW05 |
Shui Fung House, Tin Shui Estate |
Residential |
- |
|
CM9 |
ETSW08 |
VTC Youth College (Tin Shui Wai) |
Educational Institution |
Façade |
|
CM10 |
ETSW11 |
YLPMSAA Tang Siu Tong Secondary School |
Educational Institution |
Façade |
|
CM11 (3) |
E53902 |
No. 125, Lee Fong Yuen |
Residential |
Free-field |
|
CM12 (3) |
ETST05b |
No. 143, Tin Sum, (West Façade) |
Residential |
Free Field |
|
CM13 |
ESLUT01 |
No. 46A San Lee Uk Tsuen |
Residential |
Façade |
|
CM14 (3) |
|
No. 62, San Lee Uk Tsuen |
Residential |
Free Field |
|
CM15a (2) (3) |
|
Block 15, Bellevue Court |
Residential |
Free Field |
|
CM16 |
E52505 |
Hung Yan House, Hung Fuk Estate |
Residential |
Façade |
|
CM17a (2) (3) |
|
No. 120, Kiu Tau Wai Tsuen |
Residential |
Free-Field |
|
CM18 (3) |
ESPT06 |
No. 201, Shek Po Tsuen |
Residential |
Free Field |
|
CM19 (3) |
ESST07 |
No. 60 San Sang Tsuen |
Residential |
Free-Field |
|
CM20 (3) |
ESCL03 |
No. 45, Sha Chau Lei Tsuen |
Residential |
Free-Field |
|
CM21 (3) |
EHTS01 |
No. 1B, San Uk Tsuen |
Residential |
Free-Field |
|
CM22 (3) |
ELUT01 |
Block 11, Yan Wu Garden |
Residential |
Free-Field |
|
CM23a (2) (3) |
|
515 San Wai |
Residential |
Free-Field |
|
CM24 (3) |
ETKW01 |
No. 108C, Tseung Kong Wai |
Residential |
Free-Field |
|
CM25 (3) |
ETTT01 |
Block A Luxor Garden, Tung Tau Tsuen |
Residential |
Free-Field |
|
CM26 (3) |
EFKT01 |
No. 61, Fung Kong Tsuen |
Residential |
Free-Field |
|
CM27a (2) (3) |
40305 |
Lamp pole VD 8185 opposite to San Sang San Tsuen |
- |
Free-Field |
|
CM28 (3) |
42001 |
559 Sun Fung Wai, Tsing Yick Road |
Residential |
Free-Field |
|
CM29 (3) |
42251 |
Planned Residential Development in Site 4-22 |
Residential |
Free-Field |
|
CM30 (3) |
21801 |
Planned Residential Development in Site 2-18 |
Residential |
Free-Field |
|
CM31(3) |
52408 |
Planned Residential Development in Site 5-24 |
Residential |
Free-Field |
|
CM32 (3) |
52151 |
Planned School in Site 5-21 |
Educational Institution |
Free-Field |
Notes:
(1) As CM5 (No. 3H, San Hing Tsuen), CM6 (No. 310, Sha Kong Wai), CM7 (Wing Jan School/Wing Jan Lutheran Church) and CM8 (Shui Fung House, Tin Shui Estate) are more than 300 m away from the nearest site boundary of the works contract under this Project, neither baseline monitoring nor impact monitoring is proposed at these monitoring stations.
(2) CM4a, CM15a, CM17a, CM23a and CM27a are the alternative noise monitoring stations proposed to replace CM4, CM15, CM17, CM23 and CM27 respectively.
(3) For Free Field measurement, +3 dB(A) should be added to the measured results.
3.2.3 Baseline noise monitoring was first conducted between 23 August 2024 and 11 September 2024, at the six monitoring locations at CM1, CM2, CM3, CM11, CM13 and CM21. Due to the super typhoon Yagi, the baseline noise monitoring was suspended from the afternoon of 4 September to the morning of 9 September 2024. The baseline noise monitoring at the mentioned six monitoring locations was resumed in the afternoon of 9 September. Baseline noise monitoring was then conducted at CM15a, CM16, CM17a, CM18, CM20, CM22 and CM25 between 13 September 2024 and 27 September 2024, and at CM28, CM29, CM31 and CM32 between 14 September 2024 and 28 September 2024. Baseline noise monitoring was conducted between 2 October 2024 and 16 October 2024 at the ten monitoring locations at CM4a, CM9, CM10, CM12, CM14, CM19, CM23a, CM26, CM27a and CM30. Baseline noise monitoring was carried at CM24 between 3 October 2024 and 17 October 2024.The detailed monitoring schedule is shown in Appendix 1. The frequency and duration are shown in Table 3-2.
Table 3‑2 Noise Baseline Monitoring Parameters, Frequency and Duration
|
Monitoring Station |
Parameter |
Frequency and Duration |
|
CM1, CM2, CM3, CM4a, CM9, CM10, CM11, CM12, CM13, CM14, CM15a, CM16, CM17a, CM18, CM19, CM20, CM21, CM22, CM23a, CM24, CM25, CM26, CM27a, CM28, CM29, CM30, CM31, CM32 |
Leq (30mins) (as an average of 6 consecutive Leq (5mins)); L10 (5mins) and L90 (5mins) |
Continuous for 14 consecutive days with each sampling period of 5 minutes throughout the monitoring |
3.3.1 According to the Updated EM&A Manual (Apr 2022), there are 32 monitoring locations near the construction area from Contract 1 to Contract 6.
3.3.2 Sound level meters and calibrators shall comply with the International Electrotechnical Commission Publication 651:1979 (Type 1) and 804:1985 (Type 1) specification as referred to in the Technical Memorandum (TM) issued under the Noise Control Ordinance. The sound level meters shall be supplied and used with the manufacturer recommended weather shield as appropriate.
3.3.3 Sound level meters shall be calibrated using a portable calibrator prior to and following each noise measurement. The calibration levels shall be noted with the measurement results and where the difference between the calibration levels is greater than 1.0 dB(A), the measurement shall be repeated.
3.3.4 Noise measurements will not be made in the presence of fog, rain, wind with a steady speed exceeding 5 m/s or wind with gusts exceeding 10 m/s.
3.3.5 Table 3-3 summarises the equipment that have been used in the baseline noise monitoring programme. The calibration certificates are shown in Appendix 2.
Table 3‑3 Noise Monitoring Equipment
|
Equipment |
Manufacturer |
Model |
No. of Equipment |
Serial No. |
|
Sound Level Meter |
Svantek |
SVAN 971 |
5 |
C119577 |
|
C132260 |
||||
|
C132261 |
||||
|
C132269 |
||||
|
103449 |
||||
|
Rion |
NL-53 |
3 |
01130783 |
|
|
01130784 |
||||
|
01130785 |
||||
|
Nti Audio |
XL 3 |
5 |
A3A-01220-F0 |
|
|
A3A-01229-F0 |
||||
|
A3A-01230-F0 |
||||
|
A3A-01231-F0 |
||||
|
A3A-01235-F0 |
||||
|
Acoustic Calibrator |
Rion |
NC-75 |
2 |
35124530 |
|
34724245 |
3.4.1 The details of noise measurement procedures are described as follows:
§ Free-field and façade measurements were made at the monitoring locations.
§ For free field, the sound level meter was set at a height of 1.2 m above ground.
§ For façade measurement, the microphone of the sound level meter was positioned 1 m away from the building external wall of sensitive receiver, and the sound level meter was set up at a height of 1.2 m above ground.
§ Regular visits, for a period of at least once every three to four days, were conducted by the ET to ensure the continuous operation of the sound level meter during the baseline monitoring. The battery condition was checked to ensure proper functioning of the meter.
§ A-weighted Leq, L10 and L90 were measured by weatherproof logging sound level meter over a two-week period, and a sampling period of 5 minutes was used throughout the baseline monitoring.
§ Parameters such as frequency weighting, the time weighting and the measurement time were set as follows:
· Frequency weighting: A
· Time weighting: Fast
· Measurement time: Six consecutive Leq (5mins) readings are measured to
provide Leq (30mins) for the non-restricted hours.
§ Prior to and after each noise measurement, the meter was calibrated using an acoustic calibrator for 94.0 dB at 1000 Hz. If the difference in the calibration level before and after measurement was more than 1.0 dB, the measurement would be considered invalid and repeat of noise measurement would be required after recalibration or repair of the equipment.
§ No construction activities were observed near the monitoring stations during the baseline monitoring. Measurements were recorded to the nearest 0.1 dB.
§ Noise measurement should be paused during periods of high intrusive noise if possible and observation shall be recorded when intrusive noise is not avoided.
§ Noise monitoring should be conducted with the wind speed not exceeding 5 m/s and no gusts exceeding 10 m/s.
§ Schedules on the baseline monitoring were submitted by the ET to the IEC for approval before the monitoring.
3.5 Baseline Monitoring Result
3.5.1 The baseline noise monitoring results are summarized in Table 3-4, Table 3-5 and Table 3-6. The monitoring data together with graphical presentations are presented in Appendices 3-2 and Appendices 4-2, respectively.
Table 3‑4 Summary of Noise Monitoring Results during 07:00 - 19:00
|
Noise Monitoring Station |
Average Leq (30mins) |
Minimum Leq (30mins) |
Maximum Leq (30mins) |
|
CM1 (1) |
58.7 |
49.2 |
74.0 |
|
CM2 (1) |
64.2 |
48.8 |
78.3 |
|
CM3 (1) |
71.5 |
68.0 |
76.6 |
|
CM4a (1) |
75.0 |
61.8 |
93.6 |
|
CM9 |
47.7 |
41.1 |
62.0 |
|
CM10 |
60.9 |
49.6 |
72.2 |
|
CM11 (1) |
71.5 |
62.5 |
80.0 |
|
CM12 (1) |
51.6 |
42.8 |
66.4 |
|
CM13 |
54.4 |
42.4 |
66.7 |
|
CM14 (1) |
47.4 |
35.7 |
65.7 |
|
CM15a (1) |
64.7 |
46.2 |
78.4 |
|
CM16 |
71.9 |
64.6 |
82.5 |
|
CM17a (1) |
57.2 |
45.6 |
75.9 |
|
CM18 (1) |
56.6 |
44.9 |
72.9 |
|
CM19 (1) |
48.4 |
40.4 |
62.9 |
|
CM20 (1) |
57.8 |
50.8 |
71.8 |
|
CM21 (1) |
67.8 |
57.6 |
74.9 |
|
CM22 (1) |
63.9 |
50.6 |
80.8 |
|
CM23a (1) |
52.6 |
40.1 |
62.4 |
|
CM24 (1) |
52.0 |
44.8 |
63.2 |
|
CM25 (1) |
61.2 |
50.5 |
72.5 |
|
CM26 (1) |
47.6 |
38.1 |
64.7 |
|
CM27a (1) |
55.7 |
39.5 |
74.3 |
|
CM28 (1) |
55.1 |
41.6 |
74.6 |
|
CM29 (1) |
59.5 |
46.6 |
70.3 |
|
CM30 (1) |
60.2 |
38.5 |
72.5 |
|
CM31 (1) |
59.1 |
45.7 |
75.6 |
|
CM32 (1) |
57.0 |
43.1 |
70.0 |
Remark: (1) For Free Field measurement, +3 dB(A) was added to the measured results.
Table 3‑5 Summary of Noise Monitoring Results during 19:00 - 23:00
|
Noise Monitoring Station |
Average Leq (30mins) |
Minimum Leq (30mins) |
Maximum Leq (30mins) |
|
CM1 (1) |
56.5 |
49.4 |
65.6 |
|
CM2 (1) |
63.7 |
49.5 |
75.6 |
|
CM3 (1) |
68.1 |
64.2 |
72.9 |
|
CM4a (1) |
67.4 |
60.0 |
81.3 |
|
CM9 |
49.2 |
43.0 |
60.6 |
|
CM10 |
63.3 |
49.9 |
69.5 |
|
CM11 (1) |
69.9 |
65.7 |
74.7 |
|
CM12 (1) |
65.1 |
54.6 |
59.2 |
|
CM13 |
51.6 |
40.7 |
58.6 |
|
CM14 (1) |
49.4 |
35.3 |
55.9 |
|
CM15a (1) |
56.8 |
40.9 |
69.1 |
|
CM16 |
70.6 |
66.0 |
78.5 |
|
CM17a (1) |
50.8 |
44.5 |
68.1 |
|
CM18 (1) |
51.9 |
39.7 |
62.2 |
|
CM19 (1) |
48.4 |
42.1 |
64.5 |
|
CM20 (1) |
55.6 |
48.0 |
66.9 |
|
CM21 (1) |
64.6 |
58.6 |
71.0 |
|
CM22 (1) |
58.4 |
47.9 |
68.3 |
|
CM23a (1) |
52.8 |
42.2 |
64.8 |
|
CM24 (1) |
49.7 |
46.0 |
65.0 |
|
CM25 (1) |
58.6 |
52.4 |
69.9 |
|
CM26 (1) |
47.5 |
38.5 |
54.8 |
|
CM27a (1) |
50.3 |
39.7 |
65.5 |
|
CM28 (1) |
51.1 |
43.5 |
63.9 |
|
CM29 (1) |
55.2 |
46.4 |
66.0 |
|
CM30 (1) |
57.1 |
38.7 |
71.7 |
|
CM31 (1) |
51.0 |
44.4 |
60.3 |
|
CM32 (1) |
57.0 |
45.7 |
68.6 |
Remark: (1) For Free Field measurement, +3 dB(A) was added to the measured results.
Table 3‑6 Summary of Noise Monitoring Results during 23:00 - 07:00 on the next day
|
Noise Monitoring Station |
Average Leq (30mins) |
Minimum Leq (30mins) |
Maximum Leq (30mins) |
|
CM1 (1) |
53.3 |
49.0 |
61.2 |
|
CM2 (1) |
63.0 |
48.6 |
75.5 |
|
CM3 (1) |
66.8 |
62.0 |
74.8 |
|
CM4a (1) |
64.1 |
55.0 |
80.2 |
|
CM9 |
45.7 |
41.7 |
62.0 |
|
CM10 |
52.7 |
47.7 |
64.0 |
|
CM11 (1) |
68.1 |
60.6 |
75.0 |
|
CM12 (1) |
48.7 |
42.7 |
61.2 |
|
CM13 |
48.8 |
36.7 |
59.4 |
|
CM14 (1) |
47.8 |
35.9 |
60.3 |
|
CM15a (1) |
52.4 |
40.3 |
66.0 |
|
CM16 |
65.5 |
60.8 |
73.0 |
|
CM17a (1) |
48.3 |
42.1 |
70.8 |
|
CM18 (1) |
49.3 |
37.7 |
67.8 |
|
CM19 (1) |
48.0 |
39.8 |
65.8 |
|
CM20 (1) |
54.6 |
48.3 |
70.1 |
|
CM21 (1) |
60.4 |
49.2 |
71.3 |
|
CM22 (1) |
56.4 |
44.6 |
78.8 |
|
CM23a (1) |
48.8 |
39.8 |
60.6 |
|
CM24 (1) |
47.9 |
44.0 |
58.6 |
|
CM25 (1) |
56.9 |
45.8 |
67.7 |
|
CM26 (1) |
46.4 |
39.2 |
55.8 |
|
CM27a (1) |
48.8 |
36.7 |
69.6 |
|
CM28 (1) |
49.7 |
41.9 |
68.2 |
|
CM29 (1) |
51.9 |
41.6 |
70.6 |
|
CM30 (1) |
51.2 |
38.5 |
67.6 |
|
CM31 (1) |
49.1 |
42.0 |
59.0 |
|
CM32 (1) |
49.9 |
45.2 |
63.7 |
Remark: (1) For Free Field measurement, +3 dB(A) was added to the measured results.
3.5.2 During the baseline monitoring period, weather conditions varied from sunny to rainy. No particular observations were identified near the monitoring stations during the baseline monitoring period. The noise monitoring results will be used as a reference for future impact periods.
Table 3‑7 Summary of Dominant Noise Source at Respective Monitoring stations during the baseline monitoring period
|
Noise Monitoring Station |
Dominant Noise Source |
|
CM1, CM2, CM3, CM4a, CM9, CM10, CM11, CM12, CM13, CM14, CM15a, CM16, CM17a, CM18, CM19, CM20, CM21, CM22, CM23a, CM24, CM25, CM26, CM27a, CM28, CM29, CM30, CM31, CM32 |
Road Traffic Noise |
3.6.1 Maintenance and calibration procedures are as follows:
· The microphone head of the sound level meter and calibrator were regularly cleaned with a soft cloth; and
· The sound level meter and acoustic calibrator were calibrated annually by a HOKLAS accredited laboratory or the manufacturer.
3.7 Action and Limit Level for Construction Noise
3.7.1 The criteria for action and limit levels for construction noise are defined in Table 3-8.
Table 3‑8 Action and Limit Levels for Construction Noise
|
Time Period |
Action |
Limit |
|
07:00 - 19:00 on normal weekdays |
When one or more documented complaints are received |
75 dB(A)* |
Note: * Between 07:00 and 19:00, construction noise limit for school during normal term time is 70 dB(A) and 65 dB(A) during examination period.
3.8 Event and Action Plan
3.8.1
The Action
and Limit levels for construction noise are shown in Table 3-8.
Should non-compliance of the criteria occurs, action in accordance with the
Event/ Action Plans in Table 3-9 shall be carried out.
Table 3‑9 Event/ Action Plan for Construction Noise
|
Event |
ET |
IEC |
ER |
Contractor |
|
Action Level |
1. Notify IEC and Contractor; 2. Carry out investigation; 3. Report the results of investigation to the IEC, ER and Contractor; 4. Discuss with the Contractor and formulate remedial measures; and 5. Increase monitoring frequency to check mitigation effectiveness. |
1. Review the analysed results submitted by the ET; 2. Review the proposed remedial measures by the Contractor and advise the ER accordingly; and 3. Supervise the implementation of remedial measures. |
1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. Require Contractor to propose remedial measures for the analysed noise problem; and 4. Ensure remedial measures are properly implemented. |
1. Submit noise mitigation proposals to IEC ; and 2. Implement noise mitigation proposals. |
|
Limit Level |
1. Identify source; 2. Inform IEC, ER, EPD and Contractor; 3. Repeat measurements to confirm findings; 4. Increase monitoring frequency; 5. Carry out analysis of Contractors working procedures to determine possible mitigation to be implemented; 6. Inform IEC, ER and EPD the causes and actions taken for the exceedances; 7. Assess effectiveness of Contractors remedial actions and keep IEC, EPD and ER informed of the results; and 8. If exceedance stops, cease additional monitoring. |
1. Discuss amongst ER, ET, and Contractor on the potential remedial actions; 2. Review Contractors remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly; and 3. Supervise the implementation of remedial measures. |
1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. Require Contractor to propose remedial measures for the analysed noise problem; 4. Ensure remedial measures properly implemented; and 5. If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated. |
1. Take immediate action to avoid further exceedance; 2. Submit proposals for remedial actions to IEC and ER within 3 working days of notification; 3. Implement the agreed proposals; 4. Resubmit further proposal if problem still not under control; and 5. Stop the relevant portion of works as determined by ER, until the exceedance is abated. |
4.1.1 In accordance with the Updated EM&A Manual (Apr 2022), there are 22 designated and alternative monitoring locations in the vicinity of Tin Shui Wai (Tin Shui Wai) Main Channel and its tributaries, Hang Hau Tsuen Channel, Tuen Mun River, small watercourses along Deep Bay, and upstream / tributaries of Shan Pui River. As the baseline monitoring at U1, U2, SW, HT, TKW and TKW1 had been conducted during the baseline monitoring of HSK/HT NDA Stage 1 works, the baseline monitoring under this Project was carried out at 16 designated and alternative monitoring locations. This monitoring was conducted three days per week for four consecutive weeks prior to the commencement of the Project's construction works.
4.2 Monitoring Locations, Parameters, Frequency and Duration
4.2.1 Baseline water quality monitoring was carried out between 16 September and 12 October 2024. The monitoring locations are indicated in Table 4-1 and Figure 4.1.
Table 4‑1 Water Quality Monitoring Location
|
Fresh Water System |
Monitoring Station ID |
Coordinates (HK Grid) |
Description (1) |
|
|
Easting |
Northing |
|||
|
TSW Main Channel and its tributaries |
U1 (5) |
815936 |
834150 |
U |
|
U2 (5) |
816240 |
834009 |
U |
|
|
U3a (2) |
816250 |
832923 |
U |
|
|
U4a (2) |
816151 |
832474 |
U |
|
|
U5a (2) |
816212 |
832138 |
U |
|
|
U6a (2) |
817666 |
832421 |
U |
|
|
TS1 |
816815 |
832297 |
G |
|
|
TS2a (2) |
817278 |
833493 |
G |
|
|
TSR1a (2) |
817786 |
834125 |
G |
|
|
STa (2) |
816836 |
833253 |
G |
|
|
SW (5) |
816304 |
834321 |
G |
|
|
HT (5) |
816866 |
834314 |
G |
|
|
LUTa (2) |
817547 |
834717 |
G |
|
|
D2a (2) |
817483 |
835855 |
I |
|
|
Hang Hau Tsuen Channel |
LFS |
816504 |
835862 |
G |
|
D1 |
816187 |
836064 |
I |
|
|
Tuen Mun River |
D3 |
816437 |
831500 |
I |
|
Small Watercourses along Deep Bay |
TKW (3) (5) |
816594 |
834690 |
G |
|
TKW1 (3) (5) |
816563 |
834686 |
G |
|
|
D4a (2) |
815748 |
835354 |
I |
|
|
Upstream / Tributaries of Shan Pui River (4) |
D5a (2) |
819054 |
832288 |
I |
|
D6a (2) |
818934 |
832032 |
I |
|
Remarks:
(1) G: Gradient Station; I: Impact Station; U: Upstream Station.
(2) U3a, U4a, U5a, U6a, TS2a, TSR1a, STa, LUTa, D2a, D4a, D5a and D6a are the alternative water quality monitoring stations to replace U3, U4, U5, U6, TS2, TSR1, ST, LUT, D2, D4, D5 and D6, respectively, in accordance with the agreed Proposal of Alternative Monitoring Locations.
(3) The alternative monitoring stations (i.e. TKW & TKW1) for the original monitoring station (i.e. DB) have been approved by EPD (for details, please refer to Appendix A of Updated EM&A Manual (Apr 2022).
(4) The original monitoring station (i.e. U7) had been cancelled owing to the location was on a steep slope within densely vegetated area in which no water flowing through in wet season in accordance with the Proposal of Alternative Monitoring Locations.
(5) The baseline monitoring at U1, U2, SW, HT, TKW and TKW1 had been conducted during the baseline monitoring of HSK/HT NDA Stage 1 works.
4.2.2 The monitoring parameters, frequency and duration of baseline water quality monitoring are summarized in Table 4-2.
Table 4‑2 Water Quality Monitoring Parameters, Frequency and Duration
|
Parameter |
Frequency |
Duration |
|
Dissolved oxygen (DO), temperature, turbidity, pH, stream water depth and suspended solids (SS) |
3 days in a week |
At least 4 weeks prior to the commencement of construction |
4.2.3 Due to a shallow water depth with low flow rates in rivers, all the monitoring would be located at mid-depth level.
4.2.4 Duplicate water samples were collected at each sampling depth for laboratory measurement of SS. Samples were stored in high density polythene bottles, packed in ice (cooled to 4 °C without being frozen), and delivered to the laboratory on the same day of collection for analysis.
4.3 Monitoring Equipment4.3.1 The measurement of DO, temperature, turbidity, pH and stream water depth were undertaken in-situ. In-situ monitoring instruments in compliance with the specifications listed under Section 6.8 of the Updated EM&A Manual (Apr 2022) were adopted to undertake the water quality monitoring for the Project. Water quality monitoring equipment with the following specifications shall be supplied and maintained by the ET.
Dissolved Oxygen and Temperature Measuring Equipment
4.3.2 The instrument should be portable, weatherproof DO measuring instrument with cable and sensor, and use a DC power source. It should be capable of measuring:
n DO level in the range of 0 20 mg/L and 0 200% saturation; and
n Temperature of 0 45 °C.
Turbidity Measurement Instrument
4.3.3 The instrument should be a portable, weatherproof turbidity-measuring instrument using a DC power source. It should have a photoelectric sensor capable of measuring turbidity between 0 - 1000 NTU (e.g. Hach model 2100P or an approved similar instrument).
pH Measurement Instrument
4.3.4 The instrument should consist of a potentiometer, a glass electrode, a reference electrode and a temperature-compensating device. It should be readable to 0.1 pH in a range of 0 to 14. Standard buffer solutions of at least pH 7 and pH 10 shall be used for calibration of the instrument before and after use.
Sampler
4.3.5 A water sampler is required. It should comprise a transparent PVC cylinder, with a capacity of not less than 2 litres, which can be effectively sealed with latex cups at both ends. The sampler should have a positive latching system to keep it open and prevent premature closure until released by a messenger when the sampler is at the selected water depth (e.g. Kahlsico Water Sampler or an approved similar instrument).
4.3.6 For sampling location with shallow water depth, plastic bucket would be used instead.
Water Depth Detector
4.3.7 A portable, battery-operated echo sounder would be used for determining water depth at each designated monitoring station. For shallow water (less than 1 m deep), where echo sounder is not applicable, a portable water depth ruler will be used to measure water depth.
Sample Containers and Storage
4.3.8 Water samples for SS should be stored in high density polythene bottles with no preservative added, packed in ice (cooled to 4°C without being frozen) and delivered to the laboratory and analysed as soon as possible after collection. Sufficient volume of samples should be collected to achieve the detection limit stated in Table 4-4.
Calibration of In-situ Instruments
4.3.9 The DO meter and turbidimeter should be checked and calibrated before use. DO meter and turbidimeter should be certified by a laboratory accredited under HOKLAS or any other international accreditation scheme, and subsequently re-calibrated at three monthly intervals throughout all stages of the water quality monitoring. Responses of sensors and electrodes should be checked with certified standard solutions before each use. Wet bulb calibration for a DO meter should be carried out before measurement at each monitoring location.
4.3.10 Sufficient stocks of spare parts should be maintained for replacements when necessary. Backup monitoring equipment should also be made available so that monitoring can proceed uninterrupted even when some equipment is under maintenance, calibration, etc.
4.3.11 Table 4-3 summarises the equipment used in the baseline water quality monitoring. The calibration certificates are attached in Appendix 2.
Table 4‑3 In-situ Water Quality Monitoring Equipment deployed for Baseline Water Quality Monitoring
|
Equipment |
Model |
Quantity |
Serial No. |
Parameter |
Range |
Accuracy |
|
Water Sampler |
Wildco 2L Water Sampler with messenger or plastic bucket (used in shallow water depth) |
2 |
N/A |
N/A |
N/A |
N/A |
|
Multi-functional Water Quality Meter |
YSI ProDSS (multi-parameters) |
2 |
24G101659 and 24G101660
|
Dissolved Oxygen (DO) |
0 to 500% |
· 0 to 200%: ±1% of reading · 200 to 500%: ±8% of reading |
|
0 to 50 mg/L |
· 0 to 20 mg/L: ±0.1 mg/L or 1% of reading, whichever is greater · 20 to 50 mg/L: ±8% of reading |
|||||
|
Temperature |
-5 to 50 °C |
±0.2 °C |
||||
|
pH |
0 to 14 pH units |
±0.2 pH units |
||||
|
Turbidity |
0 to 4000 NTU |
· 0 to 999 NTU: 0.3 NTU or ±2% of reading, whichever is greater · 1000 to 4000 NTU: ±5% of reading |
||||
|
Salinity |
0 to 70 ppt |
· ±1.0% of reading or ±0.1 ppt, whichever is greater |
||||
|
Water Depth Ruler |
鼎峯0708 |
2 |
NA* |
Water depth |
0 7 m (Used for water depth less than 1 m) |
±0.01 m |
|
Positioning Equipment |
Garmin (GPSmap 78s) |
1 |
1WL223754 |
Positioning |
N/A |
GPS: ±1m |
4.4.1 Water samples were collected at an appropriate water depth using a sealable transparent PVC or glass cylinder. For locations with shallow water depth, a plastic bucket was used as an alternative. Usually, water was then transferred to the sample bottles until they were filled to the top with no remaining air space before the lid was securely screwed on.
4.4.2 Multi-functional water quality meters were checked, calibrated and certified by Quality Pro Test-Consult Limited (HOKLAS reg no. 259) before use, and would be subsequently re-calibrated at 3-monthly intervals throughout all stages of the water quality monitoring. Responses of sensors and electrodes should be checked with certified standard solutions before each use. Wet bulb calibration for a DO meter should be carried out before measurement at each monitoring location. For the on-site calibration of field equipment, the BS 127:1993, Guide to Field and On-Site Test Methods for the Analysis of Water should be observed.
4.4.3 Water samples for suspended solids measurement were collected in high density polythene bottles, packed in ice (chilled to 4 °C without being frozen), and delivered to the laboratory as soon as possible after collection.
4.4.4 Water sampling equipment deployed during the monitoring programme was decontaminated by manual washing and rinsed with clean distilled water after each sampling location.
4.4.5 All sampling bottles were labelled with the sample ID (including the indication of sampling station), laboratory number and sampling date. Water samples were dispatched to the testing laboratory for analysis as soon as possible after the sampling. All samples were stored in a cool box and kept at less than 4 °C without being frozen. All water samples were handled under chain of custody protocols and relinquished to the laboratory representatives at locations specified by the laboratory. The laboratory determination works started within 24 hours after collection of water samples.
4.5 Laboratory Measurement / Analysis
4.5.1 Analysis of SS was carried out by two HOKLAS accredited laboratory (Acumen Laboratory and Testing Limited and ALS Technichem (HK) Pty Limited). At least two replicate samples from each independent sampling event were collected for the SS measurement. Sufficient water samples (about 3,000 mL) were collected at the monitoring stations for carrying out the laboratory SS determination. The analytical method for suspended solids is presented in Table 4-4.
Table 4‑4 Laboratory analysis
|
Parameters |
Analytical Method |
Detection Limit |
|
Suspended Solids (SS) |
APHA 2540D (1) |
1 mg/L |
Note: (1) APHA American Public Health Association Standard Methods for the Examination of Water and Wastewater.
4.6 QA/QC RequirementsDecontamination Procedures
4.6.1 Water sampling equipment used during the course of the monitoring process was decontaminated by manual washing and rinsed with distilled water after each sampling event. All of the disposable components/ accessories were discarded after sampling.
Sampling Management and Supervision
4.6.2 All sampling bottles were labelled with the sample ID numbers (including the sampling station), and sampling date. Water samples were dispatched to the testing laboratory for analysis as soon as possible. All the collected samples were stored in a cool box to keep the temperature less than 4 ℃ but without frozen. All water samples were handled under chain of custody protocols and relinquished to the laboratory representatives at locations specified by the laboratory.
Acumen Laboratory and Testing Limited
Quality Control Measures for Sample Testing
4.6.3 Quality control of laboratory analysis of water samples was performed by ACUMEN for every batch of 20 samples:
· A minimum of 1 laboratory method blank was analyzed;
· A minimum of 1 sample duplicate was analyzed;
· A minimum of 1 sample matrix spike was analyzed.
ALS Technichem (HK) Pty Limited
Quality Control Measures for Sample Testing
4.6.4 Quality control of laboratory analysis of water samples was performed by ALS for every batch of 20 samples:
· A minimum of 1 laboratory method blank was analyzed;
· A minimum of 1 sample duplicate was analyzed;
· A minimum of 1 sample matrix spike was analyzed.
4.7 Baseline Monitoring Result
4.7.1 Baseline water quality monitoring was conducted between 16 September and 12 October 2024. The detailed monitoring schedule is shown in Appendix 1. The baseline water quality monitoring results are summarized in Table 4-5. Details of the monitoring results and data presentations of the water quality at each monitoring station are shown in Appendix 3-3 and Appendix 4-3. The quality control summary table is presented in Appendix 6.
Table 4‑5 Baseline Monitoring Result
|
Locations |
Parameters |
|||||
|
Temperature (°C) |
pH |
DO (mg/L) (Middle) |
Turbidity (NTU) |
SS (mg/L) |
||
|
U3a |
Average |
26.4 |
7.4 |
7.6 |
3.0 |
7.8 |
|
Minimum |
23.7 |
7.1 |
7.2 |
1.8 |
1.4 |
|
|
Maximum |
29.4 |
8.3 |
8.2 |
5.7 |
36.0 |
|
|
U4a |
Average |
27.5 |
7.7 |
8.1 |
6.4 |
6.7 |
|
Minimum |
24.9 |
7.4 |
7.8 |
2.1 |
2.1 |
|
|
Maximum |
29.4 |
8.3 |
8.8 |
9.6 |
17.0 |
|
|
U5a |
Average |
28.4 |
10.0 |
7.9 |
19.4 |
36.4 |
|
Minimum |
23.2 |
8.5 |
7.5 |
2.2 |
3.0 |
|
|
Maximum |
33.8 |
11.4 |
8.8 |
39.6 |
199.0 |
|
|
U6a |
Average |
30.0 |
8.2 |
8.3 |
19.2 |
5.8 |
|
Minimum |
25.2 |
7.2 |
7.8 |
2.2 |
2.2 |
|
|
Maximum |
33.5 |
9.0 |
8.9 |
39.6 |
19.0 |
|
|
TS1 |
Average |
29.1 |
9.7 |
7.8 |
7.5 |
24.0 |
|
Minimum |
23.1 |
8.1 |
7.2 |
1.8 |
1.5 |
|
|
Maximum |
33.8 |
11.2 |
8.3 |
19.2 |
99.2 |
|
|
TS2a |
Average |
30.4 |
8.3 |
8.4 |
17.6 |
12.0 |
|
Minimum |
24.1 |
7.2 |
2.5 |
5.7 |
1.7 |
|
|
Maximum |
34.2 |
9.1 |
11.7 |
27.6 |
51.0 |
|
|
TSR1a |
Average |
30.6 |
7.6 |
7.7 |
7.3 |
5.3 |
|
Minimum |
25.8 |
6.9 |
4.4 |
1.3 |
1.8 |
|
|
Maximum |
34.4 |
8.2 |
9.7 |
16.2 |
14.0 |
|
|
STa |
Average |
27.8 |
7.6 |
5.9 |
6.2 |
5.1 |
|
Minimum |
23.1 |
6.8 |
3.7 |
1.7 |
1.2 |
|
|
Maximum |
32.3 |
8.7 |
8.3 |
14.0 |
16.8 |
|
|
LUTa |
Average |
30.8 |
7.5 |
5.5 |
6.5 |
5.7 |
|
Minimum |
25.7 |
7.2 |
0.2 |
2.9 |
1.3 |
|
|
Maximum |
34.5 |
8.0 |
7.7 |
10.5 |
20.9 |
|
|
D2a |
Average |
30.8 |
7.7 |
2.1 |
7.9 |
15.9 |
|
Minimum |
24.7 |
7.3 |
0.5 |
3.8 |
1.8 |
|
|
Maximum |
35.9 |
8.1 |
4.5 |
11.7 |
138.0 |
|
|
LFS |
Average |
28.4 |
7.3 |
3.9 |
15.2 |
7.9 |
|
Minimum |
25.9 |
7.0 |
0.8 |
8.9 |
2.0 |
|
|
Maximum |
30.3 |
7.6 |
6.1 |
30.8 |
25.0 |
|
|
D1 |
Average |
28.9 |
7.2 |
5.1 |
17.2 |
13.6 |
|
Minimum |
26.0 |
6.8 |
1.0 |
9.4 |
1.3 |
|
|
Maximum |
31.5 |
7.4 |
7.4 |
43.7 |
52.4 |
|
|
D3 |
Average |
27.3 |
7.3 |
6.7 |
6.1 |
35.8 |
|
Minimum |
22.7 |
7.1 |
4.8 |
1.4 |
1.3 |
|
|
Maximum |
28.7 |
7.5 |
8.2 |
11.1 |
203.0 |
|
|
D4a |
Average |
27.5 |
7.2 |
7.1 |
19.0 |
19.6 |
|
Minimum |
25.2 |
6.6 |
5.9 |
9.6 |
1.6 |
|
|
Maximum |
29.9 |
7.7 |
7.9 |
29.7 |
116.0 |
|
|
D5a |
Average |
27.5 |
7.8 |
6.1 |
11.7 |
63.6 |
|
Minimum |
25.5 |
6.8 |
5.1 |
4.6 |
1.2 |
|
|
Maximum |
28.9 |
8.8 |
7.5 |
19.4 |
977.0 |
|
|
D6a |
Average |
27.3 |
7.2 |
7.5 |
11.9 |
7.4 |
|
Minimum |
25.4 |
6.1 |
6.3 |
8.2 |
1.8 |
|
|
Maximum |
28.9 |
7.8 |
8.1 |
14.9 |
24.6 |
|
4.7.2 During the baseline water quality monitoring, pH value with range below 6.6 or above 8.5 was observed in certain monitoring stations. A low pH value at 6.1 was observed at D6a on 16 September 2024. A high pH value at 8.8 and 8.7 was observed at D5a on 25 September 2024 and 8 October 2024. A significant high pH value with range from 9.1 to 11.4 was observed at U5a during between 16 September 2024 and 5 October 2024. A significant high pH value with range from 8.6 to 11.2 was observed at TS1 during the entire monitoring period. A significant high pH value with range from 8.6 to 9.1 was observed at TS2a on between 16 September 2024 and 27 September 2024. The high pH values spotted during the entire monitoring period at U5a are potentially attributed to natural material containing limestone accumulated along the upstream portions of the monitoring station, resulting in the formation of riverbed at the monitoring from geological perspective and thus lifting a higher pH value detected in the alkalinity-laden fluid passing through the monitoring station during baseline monitoring exercise. The particularly low or high pH values at the mentioned monitoring stations appear unusual but are potentially attributed to the domestic discharge from unsewered village and contaminated water from nearby brownfield site.
4.7.3 During the baseline water quality monitoring, DO with range at or below 1.0 mg/L was observed in certain monitoring stations. DO at 0.2 mg/L, 0.8 mg/L and 1.0 mg/L was observed at LUTa, LFS and D1 respectively on 16 September 2024. Low DO values were potentially attributable to fallen and dead leaves on the water surface and along the riverside in the vicinity of the monitoring stations where decomposition consuming dissolved oxygen might take place by such organic matters, floating groups of algal and aquatic plants might also contribute the decrease in DO value at the monitoring station simultaneously.
4.7.4 The baseline water quality monitoring results also indicated that fluctuations of DO, turbidity and SS levels varied over time. It is noticed that extraordinarily low levels of DO and extraordinarily high levels of DO, turbidity and SS that might not truly reflect the background condition were occasionally recorded during the baseline monitoring. Without knowing the reasons of these extreme levels, the DO, turbidity and SS data that are considered as outliers are excluded in the formulation of the Action and Limit Levels. Outliners were determined using a 95% of confidence level.
4.8 Action and Limit Level for Water Quality Monitoring
4.8.1 The criteria of action and limit levels for water quality monitoring are defined in Table 4-6.
Table 4‑6 Action and Limit Levels for Water Quality
|
Action Level |
Limit Level |
|
|
DO in mg/L |
< 5%-ile of baseline data |
< 4 mg/L and < 1%-ile of baseline data |
|
SS in mg/L |
> 95%-ile of baseline data |
> 99%-ile of baseline data |
|
Turbidity in NTU |
> 95%-ile of baseline data |
> 99%-ile of baseline data |
|
pH |
Beyond the range 6.6 to 8.4 |
Beyond the range of 6.5 to 8.5 |
2. For SS and turbidity, non-compliance of the water quality limit occurs when monitoring result is higher than the limit.
4.8.2 Based on the criteria listed in Table 4-6, the action and limit levels for water quality are determined in Table 4-7.
Table 4‑7 Action and Limit Levels of Water Quality
|
Fresh Water System |
Monitoring Station ID |
Parameters |
Action |
Limit |
|
TSW Main Channel and its tributaries |
D2a |
DO in mg/L |
5.4 |
4 (1) |
|
SS in mg/L |
14.0 |
15.6 |
||
|
Turbidity in NTU |
11.6 |
11.7 |
||
|
pH |
Less than 6.6 or greater than 8.4 |
Less than 6.5 or greater than 8.5 |
||
|
Hang Hau Tsuen Channel |
D1 |
DO in mg/L |
4.2 |
4 (2) |
|
SS in mg/L |
32.8 |
36.8 |
||
|
Turbidity in NTU |
23.4 |
24.5 |
||
|
pH |
Less than 6.6 or greater than 8.4 |
Less than 6.5 or greater than 8.5 |
||
|
Tuen Mun River |
D3 |
DO in mg/L |
4.9 |
4 (3) |
|
SS in mg/L |
59.4 |
67.4 |
||
|
Turbidity in NTU |
10.8 |
11.1 |
||
|
pH |
Less than 6.6 or greater than 8.4 |
Less than 6.5 or greater than 8.5 |
||
|
Small Watercourses along Deep Bay |
D4a |
DO in mg/L |
6.6 |
4 (4) |
|
SS in mg/L |
34.9 |
35.9 |
||
|
Turbidity in NTU |
26.6 |
29.0 |
||
|
pH |
Less than 6.6 or greater than 8.4 |
Less than 6.5 or greater than 8.5 |
||
|
Upstream / Tributaries of Shan Pui River (4) |
D5a |
DO in mg/L |
5.2 |
4 (5) |
|
SS in mg/L |
27.5 |
264.3 |
||
|
Turbidity in NTU |
19.3 |
19.4 |
||
|
pH |
Less than 6.6 or greater than 8.4 |
Less than 6.5 or greater than 8.5 |
||
|
D6a |
DO in mg/L |
6.9 |
4 (6) |
|
|
SS in mg/L |
16.3 |
18.3 |
||
|
Turbidity in NTU |
14.8 |
14.9 |
||
|
pH |
Less than 6.6 or greater than 8.4 |
Less than 6.5 or greater than 8.5 |
Remarks:
1. The 1%-ile of baseline DO data at D2a is 5.4 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
2. The 1%-ile of baseline DO data at D1 is 4.1 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
3. The 1%-ile of baseline DO data at D3 is 4.8 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
4. The 1%-ile of baseline DO data at D4a is 6.6 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
5. The 1%-ile of baseline DO data at D5a is 5.1 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
6. The 1%-ile of baseline DO data at D6a is 6.9 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.
4.9 Event and Action Plan
4.9.1 The action and limit levels for water monitoring were defined in Table 4-7. Should non-compliance of the criterion occurs, action in accordance with the action plan in Table 4-8 shall be carried out.
Table 4‑8 Event and Action Plan for Water Quality
|
Action |
||||
|
ET (1) |
IEC (1) |
ER (1) |
Contractor |
|
|
Action Level being exceeded by one sampling day |
1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact; 3. Inform the IEC and the Contractor; 4. Check monitoring data, all plant, equipment and the Contractors working methods; 5. Discuss mitigation measures with the IEC and the Contractor; 6. Repeat measurement on next day of exceedance. |
1. Discuss with the ET and the Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the ER accordingly; 3. Assess the effectiveness of the implemented mitigation measures. |
1. Discuss with the IEC on the proposed mitigation measures; 2. Make agreement on the mitigation measures to be implemented. |
1. Inform the ER and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET and the IEC and propose mitigation measures to the IEC and the ER; 6. Implement the agreed mitigation measures. |
|
Action Level being exceeded by more than one consecutive sampling days |
1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact; 3. Inform the IEC and the Contractor; 4. Check monitoring data, all plant, equipment and Contractors working methods; 5. Discuss mitigation measures with the IEC and the Contractor; 6. Ensure mitigation measures are implemented; 7. Prepare to increase the monitoring frequency to daily; 8. Repeat measurement on next day of exceedance. |
1. Discuss with the ET and the Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the ER accordingly; 3. Assess the effectiveness of the implemented mitigation measures. |
1. Discuss with the IEC on the proposed mitigation measures; 2. Make agreement on the mitigation measures to be implemented; 3. Assess the effectiveness of the implemented mitigation measures. |
1. Inform the ER and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET and the IEC and propose mitigation measures to the IEC and the ER within 3 working days; 6. Implement the agreed mitigation measures. |
|
Limit Level being exceeded by one sampling days |
1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact; 3. Inform the IEC, the Contractor and the DEP; 4. Check monitoring data, all plant, equipment and the Contractors working methods; 5. Discuss mitigation measures with the IEC, the ER and the Contractor; 6. Ensure mitigation measures are implemented; 7. Increase the monitoring frequency to daily until no exceedance of Limit Level. |
1. Discuss with the ET and the Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the ER accordingly; 3. Access the effectiveness of the implemented mitigation measures. |
1. Discuss with the IEC, the ET and the Contractor on the proposed mitigation measures; 2. Request the Contractor to critically review the working methods; 3. Make agreement on the mitigation measures to be implemented; 4. Assess the effectiveness of the implemented mitigation measures. |
1. Inform the Engineer and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET, the IEC and the ER and propose mitigation measures to the IEC and the ER within 3 working days; 6. Implement the agreed mitigation measures. |
|
Limit Level being exceeded by more than one consecutive sampling days |
1. Repeat in-situ measurement to confirm findings; 2. Identify source(s) of impact. 3. Inform the IEC, the Contractor and the DEP; 4. Check monitoring data, all plant, equipment and Contractors working methods; 5. Discuss mitigation measures with the IEC, the ER and the Contractor; 6. Ensure mitigation measures are implemented; 7. Increase the monitoring frequency to daily until no exceedance of Limit Level for two consecutive days. |
1. Discuss with the ET and Contractor on the mitigation measures; 2. Review proposals on mitigation measures submitted by the Contractor and advise the ER accordingly; 3. Access the effectiveness of the implemented mitigation measures. |
1. Discuss with the IEC, the ET and the Contractor on the proposed mitigation measures; 2. Request Contractor to critically review the working methods; 3. Make agreement on the mitigation measures to be implemented; 4. Assess the effectiveness of the implemented mitigation measures; 5. Consider and instruct, if necessary, the Contractor to slow down or to stop all or part of the works until no exceedance of Limit Level. |
1. Inform the ER and confirm notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with the ET, the IEC and the ER and propose mitigation measures to the IEC and the ER within 3 working days; 6. Implement the agreed mitigation measures; 7. As directed by the ER, slow down or stop all or part of the construction activities. |
Note (1) ET Environmental Team, IEC Independent Environmental Checker, ER Engineers Representative, DEP Director of Environmental Protection.
5 Conclusion 5.1 Revision for Inclusion in the EM&A Manual 5.1.1 In accordance with the Updated EM&A Manual (Apr 2022), baseline monitoring for air quality, noise and water quality has been conducted prior to commencement of the construction works under the Project. This report summarizes the baseline monitoring locations, requirements, and equipment adopted for conducting baseline air quality, noise and water quality monitoring. 5.1.2 Baseline air quality monitoring under this Project was carried out at 19 designated and alternative monitoring locations between 23 August 2024 and 24 October 2024. Action and limit levels for impact noise monitoring were established. 5.1.3 Baseline noise monitoring under this Project was carried out at 28 monitoring locations between 23 August 2024 and 17 October 2024. Action and limit levels for impact noise monitoring were established. 5.1.4 Baseline water quality monitoring under this Project was conducted at 16 monitoring locations between 16 September 2024 and 12 October 2024. The action and limit levels for water quality monitoring during construction phase were established.