Certified by Environmental Team Leader
Verified by Independent Environmental Checker
Contract No.
HY/2013/04 HZMB HKBCF – Infrastructure Works Stage II (Southern Portion)
Monthly EM&A Report
for July 2018
August
2018
China State Construction Engineering (Hong Kong) Limited
Mott
MacDonald
3/F
Mapletree Bay Point
348
Kwun Tong Road
Kowloon
Hong
Kong
T
+852 2828 5757
F
+852 2827 1823
mottmac.hk
Contents
This Monthly Environmental Monitoring and Audit (EM&A) Report is prepared for Contract No. HY/2013/04 “Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities – Infrastructure Works Stage II (Southern Portion)” (hereafter referred to as “the Contract”) for the Highways Department of Hong Kong Special Administrative Region (HKSAR). The Contract was awarded to China State Construction Engineering (Hong Kong) Limited (hereafter referred to as “the Contractor”) and Mott MacDonald Hong Kong Limited (MMHK) was appointed as the Environmental Team (ET) by the Contractor.
The Contract is part of the “Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities” (HZMB HKBCF) Project which is a “Designated Project” under Schedule 2 of the Environmental Impact Assessment (EIA) Ordinance (Cap. 499) and for which an EIA Report (Register No. AEIAR-145/2009) was prepared and approved. The current Environmental Permit (EP) for HKBCF, namely No. EP-353/2009/K, was issued on 11 April 2016. These documents are available through the EIA Ordinance Register. Commencement of the Contract took place on 13 March 2015 and the construction works commenced on 13 July 2015.
Mott MacDonald Hong Kong Limited has been appointed by the Contractor to implement the Environmental Monitoring & Audit (EM&A) programme for the Contract in accordance with the Updated EM&A Manual for HKBCF (Version 1.0) and will be providing environmental team services for the Contract.
This is the 37th Monthly EM&A Report for the Contract which summaries findings of the EM&A works during the reporting period from 1 to 31 July 2018 (the “reporting period”).
Environmental Monitoring and Audit Progress
The monthly EM&A programme was undertaken in accordance with the Updated EM&A Manual for HKBCF (Version 1.0).
It should be noted that the air quality, noise, water quality and dolphin monitoring works for the Contract are covered by Contract No. HY/2013/01 “Hong Kong-Zhuhai-Macao Bridge HKBCF – Passenger Clearance Building” and Contract No. HY/2011/03 “Hong Kong-Zhuhai-Macao Bridge Hong Kong Link Road – Section between Scenic Hill and HKBCF”. The ET of the Contract or another ET of the HZMB project is required to conduct impact air quality monitoring at AMS6 and AMS7B, noise monitoring at NMS2 and NMS3B, water quality monitoring at the twenty-one stations and dolphin monitoring works at the twenty-four transects as part of EM&A programme if these monitoring stations are no longer covered under Contract Nos. HY/2013/01 and HY/2011/03. However, this is subject to ENPO’s final decision on which ET should carry out the monitoring work at these stations.
The dates of site inspection during the reporting period are listed below:
● Environmental Site Inspection: 4, 11, 18, 23 and 30 July 2018
Breaches of Action and Limit Levels
Summary of Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level at AMS6 shall be referred to the monthly EM&A report prepared by Contract No. HY/2011/03.
There was no Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level recorded at station AMS7B by the Environmental Team of Contract No. HY/2013/01 during the reporting period.
There was no Action and Limit Level exceedance for noise recorded at station NMS2 and station NMS3B by the Environmental Team of Contract No. HY/2013/01 during the reporting period.
Sixty-four exceedances of water quality (consisting of 39 Action Level and 18 Limit Level exceedances of dissolved oxygen, one Action Level exceedance of turbidity and six Action Level exceedances of suspended solids) were recorded by the Environmental Team of Contract No. HY/2013/01 during the reporting period and were referred to this Contract for follow-up. The ET of this Contract conducted investigations and the findings with respect to the Contract can be referred to the corresponding monthly EM&A Report prepared under Contract No. HY/2013/01.
Impact dolphin monitoring results at all transects during the reporting period are reported in the monthly EM&A Report (for the reporting period) prepared for Contract No. HY/2013/01.
Complaint Log
The complaint received in relation to the environmental impact during June 2018 (as described below) was investigated by the ET of the Contract.
Log No. |
Environmental Complaint Ref. No. |
Date of Complaint Receipt |
Description |
009 |
ENPO-C0135 |
22 June 2018 |
Water Quality |
The complaint was about discharge of muddy water from HKBCF. According to site photos provided by HyD, it is noticed that there was muddy water discharged via as-constructed box culverts/outfall structures at various parts of seawall on 13 June 2018.
As informed by the Contractor of HY/2013/04, land-based construction of the main structure of Box Culverts C and D (including the outfalls) were completed by May 2018 and no further works inside the main structures were conducted. Since then, land-based reinstatement of the seawall at ground level were in progress.
ET’s regular weekly site inspections on 11, 20 and 27 June 2018 included inspection of the open waters interfacing with the HY/2013/04 site shoreline. During these site inspections, there was no observation regarding any overflow of site runoff or presence of silty water in the open waters associated with that shoreline, including at Box Culverts C and D; silt curtains at Box Culverts C and D were observed as secured with no leakage of muddy water into the open waters; and no HY/2013/04 site works were observed which may be a potential cause of muddy water discharge.
It is noted that amber rainstorm warning signal was issued during the daytime on 13 June 2018 from 15:00 to 18:15. The Contractor confirmed that prior to the heavy rain on 13 June 2018 it had inspected the silt curtains which were functioning properly with no leakage of muddy water into the open waters. After the heavy rain, the silt curtains were inspected and readjusted to ensure no leakage of site runoff into the open waters.
As part of the regular weekly site inspection process, mitigation measures for surface runoff collection and treatment (including in the Contractor’s approved Site Temporary Drainage Management Plan) were audited. Throughout June 2018, no adverse observations were made in relation to muddy surface runoff, and no muddy surface runoff was observed as overflowing from the HY/2013/04 site area into these box culverts or the open waters.
It is concluded that the source of the discharged runoff is not related to this contract and may be upstream of the HY/2013/04 works area.
The Contractor is reminded to observe all conditions stated in the relevant discharge licence and implement all necessary water quality mitigation measures identified in the EM&A Manual.
The ET’s investigation report for the abovementioned complaint is presented in Appendix J.
Notifications of Summons and Successful Prosecutions
There were no notifications of summons or prosecutions received during this reporting period.
Reporting Changes
There was no reporting change during the reporting period.
Future Key Issues
The future key issues to be undertaken in the upcoming month are:
● Retaining wall, E&M works, segment erection, excavation with road and drainage works, water pipe works, outfall works (land-based), asphalt paving, in situ deck structure, sign gantry works, road lighting and ducting.
On 13 March
2015, Mott MacDonald Hong Kong Limited (MMHK) was commissioned by China State
Construction Engineering (Hong Kong) Limited (also referred to as “the
Contractor”) to undertake the Environmental Team (ET) services (including
environmental monitoring and audit (EM&A)) for Contract No. HY/2013/04
“Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities –
Infrastructure Works Stage II (Southern Portion)” (“the Contract”) for the
Highways Department of Hong Kong Special Administrative Region (HKSAR).
The Contract is part of the “Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities” (HZMB HKBCF) Project which is a “Designated Project” under Schedule 2 of the Environmental Impact Assessment (EIA) Ordinance (Cap. 499) and for which an EIA Report (Register No. AEIAR-145/2009) was prepared and approved. The current Environmental Permit (EP) for HKBCF, namely No. EP-353/2009/K, was issued on 11 April 2016. These documents are available through the EIA Ordinance Register. Commencement of the Contract took place on 13 March 2015 and the construction works commenced on 13 July 2015. The works areas of the contract are shown in Appendix A.
This is the 37th Monthly EM&A Report
summarising the findings of
EM&A activities conducted under the Contract from 1 to 31 July 2018 (the
“reporting period”) and is submitted to
fulfil Condition 5.4 of the EP.
The Proposed works
under this Contract comprise the following:
● Construction of vehicular bridge and
at-grade roads at the southern portion of Hong Kong Boundary Crossing
Facilities;
● Construction of associated street lighting,
street furniture, road marking, road signage, box culverts and outfalls,
drainage, sewerage, fresh water and flushing water supply, irrigation,
landscape, electrical and mechanical (E&M), utilities and services works;
● Provisioning of civil engineering works and
power supply for Traffic Control and Surveillance System (TCSS); and
● Other works in accordance with the Contract.
The organisation chart and lines of communication with respect to the on-site environmental management structure together with the contact information of the key personnel are shown in Appendix B. The key personnel contact names and numbers are summarized in Table 1.1.
Table 1.1: Contact Information of Key Personnel
Party |
Position |
Name |
Telephone |
Fax |
Engineer or Engineer’s Representative (AECOM Asia Co. Ltd.) |
Chief Resident Engineer |
Alfred Cheng |
3958 7471 |
3468 2076 |
Environmental Project Office / Independent Environmental Checker (Ramboll Hong Kong LImited) |
Environmental Project Office Leader |
Y H Hui |
3465 2888 |
3465 2899 |
Independent Environmental Checker |
Raymond Dai |
3465 2888 |
3465 2899 |
|
|
Environmental Site Supervisor |
Ray Yan |
5181 8165 |
3465 2899 |
Contractor (China State Construction Engineering (Hong Kong) Limited) |
Site Agent |
Jason Chung |
9127 8369 |
2459 4336 |
Environmental Officer |
Xavier Lam |
9493 2944 |
2459 4336 |
|
|
Billy Lao |
6679 1950 |
2459 4336 |
|
Environmental Team (Mott MacDonald Hong Kong Limited) |
Environmental Team Leader |
Gary Chow |
2828 5874 |
2827 1823 |
24-hour Complaint Hotline |
- |
- |
5236 7111 |
- |
The Construction Works Programme of the Project is provided in Appendix C.
A summary of the construction activities undertaken during this reporting period is shown below:
● Box Culvert D: whole structure completed
● Box Culvert C: whole structure completed
● Segment Erection: 31 no. pcs. completed
● No marine-based segment delivery (all segments stored at segment storage yard on HKBCF island site)
● Depressed road: whole structure completed
● No generation of excavated marine sediment
Marine-based outfall works and soft landscaping works had not commenced during this reporting month.
The air quality monitoring works for the Contract are covered by Contract No. HY/2013/01 “Hong Kong-Zhuhai-Macao Bridge HKBCF – Passenger Clearance Building” and Contract No. HY/2011/03 “Hong Kong-Zhuhai-Macao Bridge Hong Kong Link Road – Section between Scenic Hill and HKBCF”. The ET of the Contract or another ET of the HZMB project is required to conduct impact air quality monitoring at AMS6 and AMS7B as part of EM&A programme if these air quality monitoring stations are no longer covered under Contract No. HY/2013/01 and HY/2011/03. Figure 2.1 shows the locations of air monitoring stations.
Table 2.1: Construction Dust Monitoring Locations
Identification No. |
Location Description |
AMS6(1) |
Dragonair/CNAC (Group)
Building |
AMS7B(1) |
3RS Site Offices |
Remarks: (1) The ET of this Contract should conduct impact air quality monitoring at the AMS listed in the table as part of EM&A programme according to latest notification from ENPO when the monitoring station(s) is/are no longer covered by another ET of the HZMB project.
The monitoring requirements, monitoring equipment, monitoring parameters, frequency and duration, monitoring methodology and monitoring schedule are detailed in the monthly EM&A Reports prepared for Contract Nos. HY/2013/01 and HY/2011/03.
The Action and Limit Levels for 1-hr TSP and 24-hr TSP are provided in Table 2.2 and Table 2.3 respectively. The same baseline and Action/Limit Levels for air quality, as derived from the baseline monitoring data recorded at AMS7, apply with the abovementioned relocation to AMS7B.
Table 2.2: Action and Limit Levels for 1-hour TSP
Monitoring Station |
Action Level, mg/m3 |
Limit Level, mg/m3 |
AMS6 – Dragonair / SNAC (Group) Building
(HKIA) |
360 |
500 |
AMS7B – 3RS Site Offices |
370 |
500 |
Table 2.3: Action and Limit Levels for 24-hour TSP
Monitoring Station |
Action Level, mg/m3 |
Limit Level, mg/m3 |
AMS6 – Dragonair / SNAC (Group) Building
(HKIA) |
173 |
260 |
AMS7B – 3RS Site Offices |
183 |
260 |
The event and action plan is provided in Appendix D.
If exceedance(s) at these stations is/are recorded by the ET of the Contract or referred by the other ET under the HZMB project to the Contract, the ET of the Contract will carry out an investigation and findings will be reported in the monthly EM&A Report.
The monitoring results for AMS6 and AMS7B are reported in the monthly EM&A Reports prepared for Contract Nos. HY/2011/03 and HY/2013/01 respectively.
Summary of Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level at AMS6 shall be referred to the monthly EM&A report prepared by Contract No. HY/2011/03.
There was no Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level recorded at station AMS7B by the Environmental Team of Contract No. HY/2013/01 during the reporting period.
The noise monitoring works for the Contract are covered by Contract No. HY/2013/01 “Hong Kong-Zhuhai-Macao Bridge HKBCF – Passenger Clearance Building”. The ET of the Contract or another ET of the HZMB project is required to conduct noise monitoring at NMS2 and NMS3B as part of EM&A programme if these monitoring stations are no longer covered under Contract No. HY/2013/01. Figure 3.1 shows the locations of noise monitoring stations.
Table 3.1: Construction Noise Monitoring Locations
Identification No. |
Location Description |
NMS2(1) |
Seaview Crescent |
NMS3B(1) (2) |
AECOM PRE’s Office |
Remarks: (1) The ET of this Contract should conduct impact noise monitoring at the NMS listed in the table as part of EM&A programme according to the latest notification from ENPO when the monitoring station(s) is/are no longer covered by another ET of the HZMB project.
(2) The Action and Limit Levels for schools will be applied for this alternative monitoring location.
The monitoring requirements, monitoring equipment, monitoring parameters, frequency and duration, monitoring methodology and monitoring schedule are detailed in the monthly EM&A Reports prepared for Contract No. HY/2013/01.
The Action and Limit Levels for construction noise are defined in Table 3.2.
Table 3.2: Action and Limit Level for Construction Noise
Parameter |
Action Level |
Limit Level |
07:00 – 19:00 hours on normal weekdays |
When one documented complaint is received |
75 dB(A)* |
Notes: If works are to be carried out during restricted hours, the conditions stipulated in the construction noise permit issued by the Noise Control Authority have to be followed.
* Reduce to 70 dB(A) for schools and 65 dB(A) during school examination period.
The monitoring results for NMS2 and NMS3B are reported in the monthly EM&A Reports prepared for Contract No. HY/2013/01. No noise exceedances were recorded at stations NMS2 and NMS3B by the ET of Contract No. HY/2013/01 during the reporting period.
The water quality monitoring works for the Contract are covered by Contract No. HY/2013/01 “Hong Kong-Zhuhai-Macao Bridge HKBCF – Passenger Clearance Building”. A total of twenty-one stations (nine Impact Stations, seven Sensitive Receiver Stations and five Control/Far Field Stations) are covered by the current EM&A programme. The ET of the Contract or another ET of the HZMB project is required to conduct water quality monitoring at these stations as part of EM&A programme if these monitoring stations are no longer covered under Contract No. HY/2013/01. Table 4.1 and Figure 4.1 shows the locations of water quality monitoring stations.
Table 4.1: Impact Water Quality Monitoring Stations
Station |
Description |
East |
North |
IS5 |
Impact Station (Close to HKBCF construction site) |
811579 |
817106 |
IS(Mf)6 |
Impact Station (Close to HKBCF construction site) |
812101 |
817873 |
IS7 |
Impact Station (Close to HKBCF construction site) |
812244 |
818777 |
IS8 |
Impact Station (Close to HKBCF construction site) |
814251 |
818412 |
IS(Mf)9 |
Impact Station (Close to HKBCF construction site) |
813273 |
818850 |
IS10(N) |
Impact Station (Close to HKBCF construction site) |
812942 |
820881 |
IS(Mf)11 |
Impact Station (Close to HKBCF construction site) |
813562 |
820716 |
IS(Mf)16 |
Impact Station (Close to HKBCF construction site) |
814328 |
819497 |
IS17 |
Impact Station (Close to HKBCF construction site) |
814539 |
820391 |
SR3(N) |
Sensitive receivers (San Tau SSSI) |
810689 |
816591 |
SR4(N) |
Sensitive receivers (Tai Ho) |
814705 |
817859 |
SR5(N) |
Sensitive receivers (Artificial Reef in NE Airport) |
812569 |
821475 |
SR6 |
Sensitive receivers (Sha Chau and Lung Kwu
Chau Marine Park) |
805837 |
821818 |
SR7 |
Sensitive receivers (Tai Mo Do) |
814293 |
821431 |
SR10A(N) |
Sensitive receivers (Ma Wan FCZ) 1 |
823644 |
823484 |
SR10B(N2) |
Sensitive receivers (Ma Wan FCZ) 2 |
823689 |
823159 |
CS(Mf)3(N) |
Control Station |
808814 |
822355 |
CS(Mf)5 |
Control Station |
817990 |
821129 |
CS4 |
Control Station |
810025 |
824004 |
CS6 |
Control Station |
817028 |
823992 |
The monitoring requirements, monitoring equipment, monitoring parameters, frequency and duration, monitoring methodology, monitoring schedule, meteorological information are detailed in the monthly EM&A Reports prepared for Contract No. HY/2013/01.
The Action and Limit Levels for water quality are provided in Table 4.2.
Table 4.2: Action and Limit Levels for Water Quality
Parameters |
Action |
Limit |
DO in mg L-1 (Surface, Middle & Bottom) |
Surface and Middle |
|
SS in mg L-1 (depth-averaged)
at all monitoring stations and control stations |
23.5 and 120% of upstream control station's SS at the same tide of the
same day* |
34.4 and 130% of upstream control station's SS at the same tide of the
same day and 10mg/L for WSD Seawater intakes* |
27.5 and 120% of upstream control station's turbidity at the same tide
of the same day* |
47.0 and 130% of upstream control station's |
Remarks:
* Reference is made to EPD approval of adjustment of water quality assessment criteria issued and became effective on 18 February 2013.
Notes:
1. “depth-averaged” is calculated by taking the arithmetic means of reading of all three depths.
2. For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.
3.
For turbidity, SS,
non-compliance of the water quality limits occurs when monitoring result is
higher than the limits.
4.
All the figures
given in the table are used for reference only and the EPD may amend the
figures whenever it is considered as necessary.
5.
The 1%-ile of baseline data for dissolved oxygen (surface and
middle) and dissolved oxygen (bottom) are 4.2 mg/L and 3.6 mg/L respectively.
If exceedance(s) at these stations is/are recorded by the ET of the Contract or referred by the other ET under the HZMB project to the Contract, the ET of the Contract will carry out an investigation and findings will be reported in the monthly EM&A Report.
The monitoring results for the twenty-one monitoring stations are reported in the monthly EM&A Reports prepared for Contract No. HY/2013/01.
Sixty-four exceedances of water quality (consisting of 39 Action Level and 18 Limit Level exceedances of dissolved oxygen, one Action Level exceedance of turbidity and six Action Level exceedances of suspended solids) were recorded by the Environmental Team of Contract No. HY/2013/01 during the reporting period and were referred to this Contract for follow-up. The ET of this Contract conducted investigations and the findings with respect to the Contract can be referred to the corresponding monthly EM&A Report prepared under Contract No. HY/2013/01.
Water quality exceedances recorded during the reporting period are summarised in Table 4.3.
Table 4.3: Action and Limit Level Exceedance for Water Quality
Date |
Parameter |
Station |
Depth |
Exceedance Recorded during Mid-ebb
Tide |
Exceedance Recorded during Mid-flood
Tide |
2 Jul 2018 |
DO |
IS10(N) |
Bottom |
Action Level |
Action Level |
2 Jul 2018 |
DO |
IS(Mf)11 |
Bottom |
- |
Action Level |
2 Jul 2018 |
DO |
SR5(N) |
Bottom |
Action Level |
Action Level |
2 Jul 2018 |
DO |
SR10A(N) |
Bottom |
- |
Action Level |
4 Jul 2018 |
DO |
IS5 |
Bottom |
Action Level |
Action Level |
4 Jul 2018 |
DO |
IS10(N) |
Bottom |
Action Level |
- |
4 Jul 2018 |
DO |
IS(Mf)11 |
Bottom |
- |
Action Level |
4 Jul 2018 |
DO |
SR10A(N) |
Bottom |
- |
Action Level |
6 Jul 2018 |
DO |
IS5 |
Bottom |
Action Level |
Action Level |
6 Jul 2018 |
DO |
IS10(N) |
Bottom |
Limit Level |
Limit Level |
6 Jul 2018 |
DO |
IS(Mf)11 |
Bottom |
Action Level |
Limit Level |
6 Jul 2018 |
DO |
IS17 |
Bottom |
Limit Level |
- |
6 Jul 2018 |
DO |
SR5(N) |
Bottom |
Action Level |
Action Level |
6 Jul 2018 |
DO |
SR10A(N) |
Bottom |
Action Level |
Limit Level |
6 Jul 2018 |
DO |
SR10B(N2) |
Bottom |
Action Level |
Action Level |
9 Jul 2018 |
DO |
IS5 |
Bottom |
Limit Level |
Action Level |
9 Jul 2018 |
DO |
IS8 |
Bottom |
Action Level |
- |
9 Jul 2018 |
DO |
IS10(N) |
Surface and Middle |
Action Level |
Action Level |
9 Jul 2018 |
DO |
IS10(N) |
Bottom |
Limit Level |
Limit Level |
9 Jul 2018 |
DO |
IS(Mf)11 |
Surface and Middle |
- |
Action Level |
9 Jul 2018 |
DO |
IS(Mf)11 |
Bottom |
Limit Level |
Action Level |
9 Jul 2018 |
DO |
IS(Mf)16 |
Bottom |
Action Level |
- |
9 Jul 2018 |
DO |
IS17 |
Bottom |
Action Level |
Action Level |
9 Jul 2018 |
DO |
SR3(N) |
Bottom |
Action Level |
- |
9 Jul 2018 |
DO |
SR5(N) |
Surface and Middle |
Action Level |
- |
9 Jul 2018 |
DO |
SR5(N) |
Bottom |
Limit Level |
Limit Level |
9 Jul 2018 |
DO |
SR6 |
Bottom |
Limit Level |
- |
9 Jul 2018 |
DO |
SR10A(N) |
Bottom |
- |
Limit Level |
9 Jul 2018 |
DO |
SR10B(N2) |
Surface and Middle |
Limit Level |
- |
9 Jul 2018 |
DO |
SR10B(N2) |
Bottom |
- |
Action Level |
11 Jul 2018 |
DO |
IS5 |
Bottom |
Action Level |
- |
11 Jul 2018 |
DO |
SR10B(N2) |
Bottom |
- |
Action Level |
11 Jul 2018 |
Turbidity |
IS10(N) |
Depth Average |
- |
Action Level |
13 Jul 2018 |
DO |
SR6 |
Surface and Middle |
Action Level |
Action Level |
13 Jul 2018 |
DO |
SR6 |
Bottom |
Action Level |
- |
13 Jul 2018 |
DO |
SR10A(N) |
Surface and Middle |
- |
Limit Level |
13 Jul 2018 |
DO |
SR10A(N) |
Bottom |
- |
Action Level |
13 Jul 2018 |
DO |
SR10B(N2) |
Surface and Middle |
- |
Limit Level |
13 Jul 2018 |
SS |
IS(Mf)11 |
Depth Average |
- |
Action Level |
13 Jul 2018 |
SS |
SR6 |
Depth Average |
- |
Action Level |
13 Jul 2018 |
SS |
SR10B(N2) |
Depth Average |
- |
Action Level |
16 Jul 2018 |
DO |
SR10A(N) |
Surface and Middle |
- |
Limit Level |
16 Jul 2018 |
DO |
SR10A(N) |
Bottom |
- |
Action Level |
16 Jul 2018 |
DO |
SR10B(N2) |
Surface and Middle |
- |
Limit Level |
16 Jul 2018 |
DO |
SR10B(N2) |
Bottom |
- |
Action Level |
16 Jul 2018 |
SS |
SR6 |
Depth Average |
- |
Action Level |
16 Jul 2018 |
SS |
SR7 |
Depth Average |
- |
Action Level |
27 Jul 2018 |
SS |
SR10B(N2) |
Depth Average |
- |
Action Level |
The details of water quality exceedances can be referred to in the monthly EM&A Report under Contract No. HY/2013/01.
The dolphin monitoring works for the Contract are covered by Contract No. HY/2013/01 “Hong Kong-Zhuhai-Macao Bridge HKBCF – Passenger Clearance Building”. The ET of the Contract or another ET of the HZMB project is required to conduct dolphin monitoring at the twenty-four transects as part of EM&A programme if these transects are no longer covered under Contract No. HY/2013/01. The dolphin monitoring should adopt line-transect vessel survey method. The survey follows pre-set and fixed transect lines in the two areas defined by AFCD as: Northeast Lantau survey area; and Northwest Lantau survey area.
Table 5.1 shows the co-ordinates for the transect lines and layout map.
The revised layout map showing the transect lines have been provided by AFCD and are shown in Figure 5.1.
Table 5.1: Impact Dolphin Monitoring Line Transect Co-ordinates (Provided by AFCD)
Transect |
HK
Grid System |
Long
Lat in WGS84 |
||
|
X |
Y |
Long |
Lat |
1# |
804671 |
815456 |
113.870287 |
22.277678 |
|
804671 |
831404 |
113.869975 |
22.421696 |
2#^ |
805476 |
820800 |
113.877995 |
22.325951 |
|
805476 |
826654 |
113.877882 |
22.378815 |
3^ |
806464 |
821150 |
114.030267 |
22.196697 |
|
806464 |
822911 |
114.047344 |
22.196712 |
4^ |
807518 |
821500 |
114.033651 |
22.206219 |
|
807518 |
829230 |
114.108618 |
22.206267 |
5^ |
808504 |
821850 |
114.037037 |
22.215126 |
|
808504 |
828602 |
114.102523 |
22.215169 |
6^ |
809490 |
822150 |
114.039938 |
22.224033 |
|
809490 |
825352 |
114.070995 |
22.224056 |
7#^ |
810499 |
822000 |
114.038474 |
22.233143 |
|
810499 |
824613 |
114.063820 |
22.233163 |
8# |
811508 |
821123 |
113.936539 |
22.328966 |
|
811508 |
824254 |
113.936486 |
22.357241 |
9# |
812516 |
821303 |
113.946320 |
22.330606 |
|
812516 |
824254 |
113.946279 |
22.357255 |
10* |
813525 |
820827 |
113.956112 |
22.326321 |
|
813525 |
824657 |
113.956066 |
22.360908 |
11# |
814556 |
818853 |
113.966155 |
22.304858 |
|
814556 |
820992 |
113.966125 |
22.327820 |
12 |
815542 |
818807 |
113.975726 |
22.308109 |
|
815542 |
824882 |
113.975647 |
22.362962 |
13 |
816506 |
819480 |
113.985072 |
22.314192 |
|
816506 |
824859 |
113.985005 |
22.362771 |
14 |
817537 |
820220 |
113.995070 |
22.320883 |
|
817537 |
824613 |
113.995018 |
22.360556 |
15 |
818568 |
820735 |
114.005071 |
22.325550 |
|
818568 |
824433 |
114.005030 |
22.358947 |
16 |
819532 |
821420 |
114.014420 |
22.331747 |
|
819532 |
824209 |
114.014390 |
22.356933 |
17 |
820451 |
822125 |
114.023333 |
22.338117 |
|
820451 |
823671 |
114.023317 |
22.352084 |
18 |
821504 |
822371 |
114.033556 |
22.340353 |
|
821504 |
823761 |
114.033544 |
22.352903 |
19 |
822513 |
823268 |
114.043340 |
22.348458 |
|
822513 |
824321 |
114.043331 |
22.357971 |
20 |
823477 |
823402 |
114.052695 |
22.349680 |
|
823477 |
824613 |
114.052686 |
22.360610 |
21 |
805476 |
827081 |
113.877878 |
22.382668 |
|
805476 |
830562 |
113.877811 |
22.414103 |
22 |
806464 |
824033 |
113.887520 |
22.355164 |
|
806464 |
829598 |
113.887416 |
22.405423 |
23 |
814559 |
821739 |
113.966142 |
22.334574 |
|
814559 |
824768 |
113.966101 |
22.361920 |
24^ |
805476 |
815900 |
113.979368 |
22.187721 |
|
805476 |
819100 |
114.010398 |
22.187756 |
Remarks:
(a) * Due to the presence of deployed silt curtain systems at the site boundaries of the Contract, some of the transect lines shown in Figure 5.1 could not be fully surveyed during the regular survey. Transect 10 is reduced from 6.4km to approximately 3.6km in length due to the HKBCF construction site. Therefore the total transect length for both NEL and NWL combined is reduced to approximately 108km.
(b) # Coordinates for transect lines 1, 2, 7, 8, 9 and 11 have been updated in respect to the Proposal for Alteration of Transect Line for Dolphin Monitoring approved by EPD on 19 August 2015.
(c) ^ The change of transect lines 2, 3, 4, 5, 6 and 7 and new transect line 24 were justified and verified by the ET Leader for Contract No. HY/2010/02 and the IEC respectively on 24 March 2017 and it was approved by EPD on 12 May 2017.
The monitoring requirements, monitoring equipment, monitoring parameters, frequency and duration, monitoring methodology, monitoring schedule, meteorological information are detailed in the monthly EM&A Reports prepared for Contract No. HY/2013/01.
The Action and Limit Levels for Chinese White Dolphin Monitoring are provided in Table 5.2 and Table 5.3, respectively.
Table 5.2: Action and Limit Levels for Chinese White Dolphin Monitoring - Approach to Define Action Level (AL) and Limit Level (LL)
Table 5.3: Derived Value of Action Level (AL) and Limit Level (LL) for Chinese White Dolphin Monitoring
|
North Lantau Social Cluster |
|
|
NEL |
NWL |
Action Level |
(STG <
4.2) & (ANI < 15.5) |
(STG <
6.9) & (ANI < 31.3) |
Limit Level |
[(STG <
2.4) & (ANI <8.9)] AND [ (STG < 3.9) & (ANI < 17.9)] |
The event and action plan is provided in Appendix D.
If exceedance(s) at these survey transect(s) is/are recorded by the ET of the Contract or referred by the other ET under the HZMB project to the Contract, the ET of the Contract will carry out an investigation and findings will be reported in the monthly EM&A Report.
The monitoring results for dolphin monitoring during the reporting period are reported in the monthly EM&A Report (for the reporting period) prepared for Contract No. HY/2013/01.
Site Inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control mitigation measures for the project. During the reporting period, site inspections were carried out on 4, 11, 18, 23 and 30 July 2018.
When soft landscaping works within the site boundaries of the Contract are commenced, construction phase landscape and visual mitigation measures would be implemented in accordance with the EP, EIA and EM&A Manual. Monitoring and audit of landscape and visual mitigation measures would be conducted bi-weekly in accordance with Section 14.2 of the Updated EM&A Manual for HKBCF (Version 1.0). Soft landscaping works within the Contract site had not commenced during the reporting period.
Particular observations during the site inspections and corrective actions undertaken by the Contractor are described below.
a. Loose general refuse was observed in the vicinity of Bridge D9c. Subsequently, the loose general refuse near Bridge D9c was removed. The observation was closed on 4 July 2018.
27 June 2018
a. Visible smoke was observed in the exhaust of an excavator near P1302. Subsequently, the excavator was repaired and maintained regularly to prevent visibile smoke emission. The observation was closed on 4 July 2018.
b. Loose general refuse and C&D waste were observed at RW11 and the segment storage area. Subsequently, the general refuse and C&D waste were cleared. The observation was closed on 4 July 2018.
4 July 2018
a. Gaps were observed at the silt curtain near Box Culvert C. Subsequently, the silt curtain near Box Culvert C was fixed and no gaps were observed at the silt curtain. The observation was closed on 11 July 2018.
b. Unsorted C&D waste and general refuse was observed near P803 area. Subsequently, the C&D waste and general refuse were sorted and the general refuse was cleared. The observation was closed on 11 July 2018.
c. A general refuse tank with no cover was observed near D9c area. Subsequently, the general refuse tank was cleared. The observation was closed on 11 July 2018.
11 July 2018
a. Accumulation of C&D waste near P803 was observed. Subsequently, the C&D waste was removed. The observation was closed on 18 July 2018.
b. Dust emission was observed near the haul road near Bridge P14 area. Subsequently, water spray was provided for the haul road. The observation was closed on 18 July 2018.
c. Accumulation of general refuse was observed near Bridge D9c area. Subsequently, the general refuse was cleared. The observation was closed on 18 July 2018.
18 July 2018
a. Stagnant water pond was observed inside HY/2013/04 WA3 Works Area. Subsequently, the stagnant water pond was cleared. The observation was closed on 23 July 2018.
b. Loose general refuse was observed under Bridge D10 between P1001 and P1002. Subsequently, the general refuse was cleared. The observation was closed on 23 July 2018.
c. Chemical container was observed on the ground without drip tray under Bridge D10 between P1001 and P1002. Subsequently, the chemical container was removed. The observation was closed on 23 July 2018.
23 July 2018
a. Loose general refuse was observed near P1001 area. Subsequently, the general refuse was cleared. The observation was closed on 30 July 2018.
b. Loose general refuse was observed near P1002 area. Subsequently, the general refuse was cleared. The observation was closed on 30 July 2018.
c. Leakage of site runoff was observed outside the silt curtain at Box Culvert C. Subsequently, the silt curtain near Box Culvert C was extended in length and no leakage of site runoff was observed. The observation was closed on 30 July 2018.
30 July 2018
a. Accumulation of general refuse was observed near P1202 area. The Contractor was reminded to clear the general refuse as soon as possible. Follow-up actions for the outstanding observation will be inspected during the upcoming site inspections and reported in the coming reporting period.
b. Loose general refuse was observed near P1005 area. The Contractor was reminded to clear the general refuse as soon as possible. Follow-up actions for the outstanding observation will be inspected during the upcoming site inspections and reported in the coming reporting period.
The Contractor registered as a chemical waste producer for the Contract. Sufficient numbers of receptacles were available for general refuse collection and sorting. As a practical means, the disposal operation is managed by a single HKBCF contractor who is also responsible for applying dumping permit and its subsequent extension applications from EPD. Contract No. HY/2013/03 has been assigned to coordinate and arrange for disposal of extracted marine sediment from this Contract.
There was no generation of excavated sediment for treatment during this reporting period. Any treatment of excavated marine sediment will be conducted using cement solidification/ stabilization (Cement S/S) techniques and the treated sediment will be reused onsite for either backfilling or landscaping (e.g. berm material).
The monthly summary of waste flow table is detailed in Appendix E.
The Contractor was reminded that chemical waste containers should be properly treated and stored temporarily in designated chemical waste storage area on site in accordance with the Code of Practice on the Packing, Labelling and Storage of Chemical Waste.
After the acceptance of the review of the approved Sediment Quality Report (SQR) for this Project under EPD letter dated 19 August 2015, an approval to dispose the marine sediment extracted from bored piling for this Project was then approved under memo from Secretary, Marine Fill Committee of CEDD dated 20 August 2015 for the disposal of marine sediment extracted from bored piling works. The disposal sites allocated to this Project are the Mud Pit CMP2 of the Confined Marine Sediment Disposal Facility to the South of The Brothers (or at the East of Sha Chau). As advised by CEDD in the memo dated 19 February 2016, from 00:00 on 22 March 2016 onward, the disposal space at CMP2 of the South of The Brothers is closed and all disposal of contaminated sediment is to be carried out at CMP Vd to the East of Sha Chau (ESC).
As Contract No. HY/2013/01 has commenced treatment of the extracted marine sediment, treatment will continue and the treated marine sediment will be re-used within the HKBCF Island. On the other hand, Contract Nos. HY/2013/02, HY/2013/03 and HY/2013/04 have not commenced the treatment of extracted marine sediment. Therefore the marine sediment extracted from these three Contracts will be disposed to the allocated disposal sites directly without treatment. As a practical means, the disposal operation is managed by one contractor who is also responsible for applying dumping permit and its subsequent extension applications from EPD. Contract No. HY/2013/03 has been assigned to coordinate and arrange for disposal of extracted marine sediment from all three Contracts.
The SQR was further reviewed in mid-2016. EPD has no comment to extend the validity of the SQR to August 2017 under letter dated 18 August 2016.
Based on the actual piling operation, the estimated quantity of marine sediment to be extracted has been revised from 85,000 m3 to 126,000 m3 (bulk volume). EPD has no comments on the request as in the letter dated 20 October 2016. The Secretary of Marine Fill Committee, CEDD approved the increasing quantity in the memo dated 10 November 2016.
During the course of reviewing the SQR, it was noted that the contamination level of the marine sediment extracted from the inner part of the HKBCF Island was not identified during the previous sampling and testing. As requested by EPD, sampling and testing are required. The Sediment Sampling and Testing Proposal (SSTP) for the inner area of the HKBCF Island was approved by EPD on 2 June 2016.
As in the agreed SSTP for the inner area of the HKBCF Island, samples were taken from the seventeen batches of stockpiled marine sediments and from five boreholes each in one of the five sampling grids. After conducting chemical tests on samples, six batches of stockpiled samples under Contract No. HY/2013/03 and all eight batches of stockpiled samples under Contract No. HY/20013/04 are classified as Category L sediment. The Secretary of Marine Fill Committee of CEDD allocated disposal sites under memo dated 24 October 2016 and dated 22 November 2016 for disposal of a total of 9,500 m3 in-situ volume of Category L sediment (using a bulk factor of 1.3). The Category L sediment was disposed in December 2016.
One sample from the batch of stockpiled marine sediment under Contract No. HY/2013/03 and samples from all five sampling grids had contamination levels exceeding the Lower Chemical Exceedance Levels (LCEL) and biological screenings were carried out. All samples passed the biological screenings and are classified as Category Mp sediment and to be disposed off site using Type II confined marine disposal method the same method used for marine sediment extracted from other part of the HKBCF Island.
The barge for disposal of marine sediment will morn at the temporary loading and unloading at the east shore of the HKBCF Island, which has been being used by reclamation contractor (Contract No. HY/2010/02) for reclamation activities. In terms of safety consideration, each dumping date will be allocated to one Contract. The quantity of marine sediment disposed on the date is from one Contract.
During dumping, each Contractor is responsible for transporting the marine sediment from his site area to the barge. The estimated quantity of marine sediment in each truck is confirmed by Resident Site Staff of each Contract. The trip tickets for transportation and disposal of marine sediment are collected and checked. Contract No. HY/2013/03 as the dumping permit holder is responsible for reporting to EPD the quantity disposed of as the condition stipulated in the dumping permit.
AECOM has confirmed that the disposal of excavated marine sediments to allocated dumping site via Contract No. HY/2013/03 has been completed with the last batch disposal on 30 August 2017. The total quantities disposed are presented in the following table (Table 6.1):
Table 6.1: Summary of Marine Sediment disposed to Dumping Site via Contract No. HY/2013/03
|
Type
of Sediment and Quantity Disposed (m3) |
|
|
Cat. L (in
Type I) |
Type II |
Total |
3,570 |
39,814 |
Note: For monthly breakdown of these quantities, please refer to the waste flow table in Appendix E.
The valid environmental licenses and permits during the reporting period are summarized in Appendix F.
In response to the site audit findings, the Contractor carried out corrective actions.
A summary of the Implementation Schedule of Environmental Mitigation Measures (EMIS) is presented in Appendix G. Most of the necessary mitigation measures were implemented properly.
Implementation status of the Regular Marine Travel Route Plan (RMTRP) was checked by ET. Training of marine travel route for marine vessel operator was given to relevant staff and relevant records were kept properly.
According to the Contractor of HY/2013/04, all marine-based segment deliveries were completed in January 2018 and no marine-based works were conducted under the contract during the reporting month.
The localised silt curtains under this Contract were deployed on 15 July 2017. No dolphins were observed by the trained MMOs during the reporting month. Regarding the implementation of dolphin monitoring and protection measures (i.e. implementation of Dolphin Watching Plan, Dolphin Exclusion Zone and Silt Curtain Integrity Check), regular checking was conducted by the experienced MMOs within the works area to ensure no dolphin was trapped by the enclosed silt curtain systems. Any dolphin spotted within the enclosed silt curtain systems was reported and recorded. Relevant procedures were followed and measures were well implemented. Silt curtain systems were also inspected timely in accordance to the submitted plan. All inspection records were kept properly.
Summary of Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level at AMS6 shall be referred to the monthly EM&A report prepared by Contract No. HY/2011/03.
There was no Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level recorded at station AMS7B by the Environmental Team of Contract No. HY/2013/01 during the reporting period.
There was no Action and Limit Level exceedance for noise recorded at station NMS2 and station NMS3B by the Environmental Team of Contract No. HY/2013/01 during the reporting period.
Water quality monitoring exceedances were recorded by the ET of Contract No. HY/2013/01 during the reporting period and were referred to this Contract for follow-up. The ET of this Contract conducted investigations and the findings with respect to the Contract can be referred to the corresponding monthly EM&A Report prepared under Contract No. HY/2013/01.
Impact dolphin monitoring results at all transects during the reporting period are reported in the monthly EM&A Report (for the reporting period) prepared for Contract No. HY/2013/01.
Complaints
The complaint received in relation to the environmental impact during June 2018 was investigated by the ET of the Contract. The summary of environmental complaints is presented in Table 6.2. The details of cumulative statistics of Environmental Complaints are provided in Appendix H.
Table 6.2: Summary of Environmental Complaints for the Reporting Month
Log No. |
Environmental Complaint Ref. No. |
Date of Complaint Receipt |
Description |
009 |
ENPO-C0135 |
22 June 2018 |
Water Quality |
The complaint was about discharge of muddy water from HKBCF. According to site photos provided by HyD, it is noticed that there was muddy water discharged via as-constructed box culverts/outfall structures at various parts of seawall on 13 June 2018.
This investigation reports the findings with respect to Box Culverts C and D which are located inside HY/2013/04 works site. It is noted that more than one HKBCF contract site was subject to the present complaint.
It is noted that the construction of Box Culverts C and D is divided into two parts, with HY/2013/04 and the adjacent BCF contract each responsible for the part inside its respective site boundary. The general HY/2013/04 site arrangement map showing the locations of Box Culverts C and D relative to these contracts is provided in Attachment 2 of ET’s investigation report.
As informed by the Contractor of HY/2013/04, land-based construction of the main structure of Box Culverts C and D (including the outfalls) were completed by May 2018 and no further works inside the main structures were conducted. Since then, land-based reinstatement of the seawall at ground level were in progress.
Prior to the subject incident, ET conducted weekly site inspection on 11 June 2018, during which the HY/2013/04 site shoreline interfacing with open waters was inspected. There was no observation regarding any overflow of site runoff or presence of silty water in the open waters associated with that shoreline, including at Box Culverts C and D. Silt curtains at Box Culverts C and D were observed as secured with no leakage of muddy water into the open waters. No HY/2013/04 site works were observed which may be a potential cause of muddy water discharge. Relevant photos are presented in Attachment 3 of ET’s investigation report.
It is noted that amber rainstorm warning signal was issued during the daytime on 13 June 2018 from 15:00 to 18:15. The relevant record from the Hong Kong Observatory is presented in Attachment 4 of ET’s investigation report.
The Contractor confirmed that prior to the heavy rain on 13 June 2018 it had inspected the silt curtains which were functioning properly with no leakage of muddy water into the open waters. Photo provided by the Contractor is presented in Attachment 3 of ET’s investigation report.
After the heavy rain, the silt curtains were inspected and readjusted to ensure no leakage of site runoff into the open waters. Photo taken by the Contractor on 16 June 2018 is also presented in Attachment 3 of ET’s investigation report.
ET conducted weekly site inspection on 20 June 2018, during which the HY/2013/04 site shoreline interfacing with open waters was inspected. There was no observation regarding any overflow of site runoff or presence of silty water in the open waters associated with that shoreline. Silt curtains at Box Culverts C and D were observed as secured with no leakage of muddy water into the open waters. According to the Contractor, the opening in the silt curtain at Box Culvert C was repaired by 20 June 2018. Relevant photos are presented in Attachment 3 of ET’s investigation report.
Following receipt of the subject complaint, ET conducted weekly site inspections on 27 June 2018, during which the HY/2013/04 site shoreline interfacing with open waters was inspected. There was no observation regarding any overflow of site runoff or presence of silty water in the open waters associated with that shoreline. Silt curtains at Box Culverts C and D were observed as secured with no leakage of muddy water into the open waters. No HY/2013/04 site works were observed which may be a potential cause of muddy water discharge. Relevant photos are presented in Attachment 3 of ET’s investigation report.
As part of the regular weekly site inspection process, mitigation measures for surface runoff collection and treatment were audited. According to the Contractor’s approved Site Temporary Drainage Management Plan (Section 4.1.1 for HKBCF island site), in the event of flooding on site due to heavy rainstorm, the effluent and surface water would be collected by temporary drainage channels to on-site waste water treatment facilities (including, but not limited to, sedimentation tank and Wetsep) and then discharged by discharge well on-site; furthermore, temporary drainage channel or earth bund shall be formed in front of the existing crest of sloping seawall within the site area in order to prevent the effluent from being overflowed into the sea due to heavy rainstorm. It is noted that the temporary site drainage system are not connected to Box Culverts C and D within HY/2013/04 site and therefore it is not anticipated that muddy surface runoff would flow into these box culverts. The Layout Plan for Site Temporary Drainage is presented in Attachment 5 of ET’s investigation report. Throughout June 2018, no adverse observations were made in relation to muddy surface runoff, and no muddy surface runoff was observed as overflowing from the HY/2013/04 site area into these box culverts or the open waters.
It is concluded that the source of the discharged runoff is not related to this contract and may be upstream of the HY/2013/04 works area.
The Contractor is reminded to observe all conditions stated in the relevant discharge licence and implement all necessary water quality mitigation measures identified in the EM&A Manual.
The following specific mitigation measures, as stated in the EMIS of EM&A Manual, are highlighted for constant maintenance and reinforcement to prevent future recurrence:
● single layer silt curtains will be applied around all works; and
● silt curtain shall be fully maintained throughout the works.
Specifically, for land works:
● wastewater from temporary site facilities should be controlled to prevent direct discharge to surface or marine waters; and
● silt removal facilities, channels and manholes shall be maintained and any deposited silt and grit shall be removed regularly, including specifically at the onset of and after each rainstorm.
To prevent recurrence of this incident, the following measures are proposed for Contractor’s consideration:
● more frequent checking of the silt curtain’s integrity;
● more frequent pumping of the runoff contained inside the silt curtain; and
● a larger silt curtain to contain a larger area of silt runoff within.
The ET’s investigation report for the abovementioned
complaint is presented in Appendix J.
Notification of Summons and Successful Prosecution
No notification of summons or prosecutions was received during the reporting period.
Statistics on notifications of summons and successful prosecutions are summarized in Appendix H.
As informed by the Contractor, the major construction activities for August 2018 are summarized in Table 7.1.
Table 7.1: Construction Activities for August 2018
Site Area |
Description of Activities |
HKBCF |
●
Retaining wall, E&M works, segment erection,
excavation with road and drainage works, water pipe works, outfall works
(land-based), asphalt paving, in situ deck structure, sign gantry works, road
lighting and ducting. |
The tentative schedule for weekly site inspections for August 2018 is provided in Appendix I.
General
Commencement of the Contract took place on 13 March 2015 and the construction works of the Contract commenced on 13 July 2015.
Breaches of Action and Limit Levels
Summary of Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level at AMS6 shall be referred to the monthly EM&A report prepared by Contract No. HY/2011/03.
There was no Action and Limit Level exceedance of 1-hr TSP level and 24-hr TSP level recorded at station AMS7B by the Environmental Team of Contract No. HY/2013/01 during the reporting period.
There was no Action and Limit Level exceedance for noise recorded at station NMS2 and station NMS3B by the Environmental Team of Contract No. HY/2013/01 during the reporting period.
Sixty-four exceedances of water quality (consisting of 39 Action Level and 18 Limit Level exceedances of dissolved oxygen, one Action Level exceedance of turbidity and six Action Level exceedances of suspended solids) were recorded by the Environmental Team of Contract No. HY/2013/01 during the reporting period and were referred to this Contract for follow-up. The ET of this Contract conducted investigations and the findings with respect to the Contract can be referred to the corresponding monthly EM&A Report prepared under Contract No. HY/2013/01.
Impact dolphin monitoring results at all transects during the reporting period are reported in the monthly EM&A Report (for the reporting period) prepared for Contract No. HY/2013/01.
Environmental Site Inspections
Environmental site inspections were carried out on 4, 11, 18, 23 and 30 July 2018. Recommendations on remedial actions were given to the Contractor for the deficiencies identified during the site inspections.
Complaints
The complaint received in relation to the environmental impact during June 2018 was investigated by the ET of the Contract.
The complaint was about discharge of muddy water from HKBCF. According to site photos provided by HyD, it is noticed that there was muddy water discharged via as-constructed box culverts/outfall structures at various parts of seawall on 13 June 2018.
As informed by the Contractor of HY/2013/04, land-based construction of the main structure of Box Culverts C and D (including the outfalls) were completed by May 2018 and no further works inside the main structures were conducted. Since then, land-based reinstatement of the seawall at ground level were in progress.
ET’s regular weekly site inspections on 11, 20 and 27 June 2018 included inspection of the open waters interfacing with the HY/2013/04 site shoreline. During these site inspections, there was no observation regarding any overflow of site runoff or presence of silty water in the open waters associated with that shoreline, including at Box Culverts C and D; silt curtains at Box Culverts C and D were observed as secured with no leakage of muddy water into the open waters; and no HY/2013/04 site works were observed which may be a potential cause of muddy water discharge.
It is noted that amber rainstorm warning signal was issued during the daytime on 13 June 2018 from 15:00 to 18:15. The Contractor confirmed that prior to the heavy rain on 13 June 2018 it had inspected the silt curtains which were functioning properly with no leakage of muddy water into the open waters. After the heavy rain, the silt curtains were inspected and readjusted to ensure no leakage of site runoff into the open waters.
As part of the regular weekly site inspection process, mitigation measures for surface runoff collection and treatment (including in the Contractor’s approved Site Temporary Drainage Management Plan) were audited. Throughout June 2018, no adverse observations were made in relation to muddy surface runoff, and no muddy surface runoff was observed as overflowing from the HY/2013/04 site area into these box culverts or the open waters.
It is concluded that the source of the discharged runoff is not related to this contract and may be upstream of the HY/2013/04 works area.
The Contractor is reminded to observe all conditions stated in the relevant discharge licence and implement all necessary water quality mitigation measures identified in the EM&A Manual.
Notifications of Summons and Successful Prosecutions
There were no notifications of summons or prosecutions received during the reporting period.
Appendix A. Location of Works Areas
Appendix B. Project Organization for Environmental Works
Appendix C. Construction Programme
Appendix D. Event and Action Plan
Appendix E. Waste Flow Table
Appendix F. Environmental Licences and Permits
Appendix G. Implementation Schedule for Environmental Mitigation Measures (EMIS)
Appendix H. Statistics on Environmental Complaints, Notification of Summons and Successful Prosecutions
Appendix I. Environmental Site Inspection Schedule
Appendix J. Complaint Investigation Report