Global-Report-2 Sided 1 Column

Executive Summary

1 This quarterly EM&A summary report under the Main Contract for the Design and Construction of Tsuen Wan Drainage Tunnel (hereafter referred to as the “Project”) to Maeda-CREC-SELI Joint Venture (MCSJV), which summarises the findings of environmental impact monitoring works during the period from October to December 2010.

2 Noise monitoring was performed at five monitoring stations (NSR1, NSR3, NSR6, NSR8 and NSR9). Air quality monitoring was carried out at four monitoring stations (ASR1, ASR3, ASR8 and ASR9). Water quality monitoring was carried out at four monitoring stations (Intake I-1, Intake I-2, Intake I-3 and Outfall O-1). Noise level was measured in terms of Leq, L10 and L90 (30min). Air quality was measured in terms of 1-hour Total Suspended Particulates (TSP). Water quality was measured in terms of Temperature, pH, Dissolved Oxygen (DO), Turbidity (Tby) and Suspended Solid (SS).

3 Details of all monitoring stations are summarized in the below table.

Type of Monitoring	Monitoring Station ID	Name of Premises	Status of Monitoring Works during the Reporting Period
Air Quality Monitoring	ASR1	Sik Sik Yuen Ho Fung College	Ongoing
	ASR3	Hong Hoi Chee Hong Temple	Ongoing
	ASR8	Beach Tower (Long Beach Gardens)	Ongoing
	ASR9	Greenview Terrace (Block 1)	Ongoing
Noise Monitoring	NSR1	Sik Sik Yuen Ho Fung College	Ongoing
	NSR3	Hong Hoi Chee Hong Temple	Ongoing
	NSR6	Squatters	Ongoing
	NSR8	Beach Tower (Long Beach Gardens)	Ongoing
	NSR9	Greenview Terrace (Block 1)	Ongoing
Water Quality Monitoring	I-1	Intake I-1	Ongoing
	I-2	Intake I-2	Ongoing
	I-3	Intake I-3	Ongoing
	O-1	Outfall O-1	Ongoing

4 The major construction activities undertaken by the Contractor during the period from October to December 2010 include site cleaning and tidying at I-1, I-2, I-3 and outfall; drilling, excavation and rock splitting of spiral ramp at outfall; pre-bored H-pile drilling and soil nailing for Castle Peak Road (CPR) open excavation at outfall; tunnel boring machine (TBM) drilling of the tunnel and mucking out of tunnel spoil at outfall; marine dredging works for basin scheme at Portion E; drilling and excavation of vortex shaft at I-3; temporary rock dowel drilling and installation at I-3; construction of skin wall at I-3; excavation of man access shaft and vortex drop shaft at I-2; pipe jacking at Portion G at I-2; pile caps construction for temporary platform at Portion G at I-2; cascade and channel modification concrete structure works at I-1; horizontal drilling at I-1; removal of sea wall and amour rock for basin scheme at Portion E; construction of pre-bored H-Pile for PB wall at I-3; preparation work for retaining wall at I-2; construction of footing for erecting the tower crane at I-3; drilling, excavation and rock splitting of man access shaft and vortex drop shaft at I-2; construction of approach channel structure at I-2; erection of temporary steel platform for H-pile wall at Portion G at I-2; and backfilling of spiral ramp centre void at I-1.

5 No open construction activities were carried out during restricted hours in the reporting period. Only mining works and probe drilling were conducted during restricted hours in this reporting period.

6 No project related exceedances of air quality and water quality monitoring was recorded. No exceedance of noise limit level was recorded, but EPD receives two complaints on construction noise which trigger the exceedance of noise action level. The below table summarizes the exceedances of air quality, noise and water quality in the reporting period.

Parameter	Action Level Exceedance	Limit Level Exceedance
Air	Nil	Nil
Noise	Two complaints received on 17 Nov 2010 at NSR 9	Nil
DO	One record on 1 Nov 2010 at O-1(FT)(Surface)	Two records on 27 Oct and 3 Nov 2010 at O-1(FT)(Surface) Three records on 27 Oct, 1 Nov and 3 Nov 2010 at O-1(FT)(Middle) Four records on 25 Oct, 27 Oct, 1 Nov and 3 Nov 2010 at O-1(FT)(Bottom) Two records on 27 Oct and 29 Oct 2010 at O-1(ET)(Surface) Two records on 25 Oct and 27 Oct 2010 at O-1(ET)(Middle) One records on 27 Oct 2010 at O-1(ET)(Bottom)
Turbidity	One record on 5 Nov 2010 at I-1	Two records on 15 Oct and 5 Nov 2010 at I-2 One record on 15 Oct 2010 at I-3 One record on 25 Oct 2010 at O-1(FT) One record on 8 Nov 2010 at O-1(ET)
SS	Three records on 20 Oct, 5 Nov and 1 Dec 2010 at I-1 Two records on 15 Oct and 31 Dec 2010 at I-2 Three records on 27 Oct, 3 Dec and 22 Dec 2010 at O-1(FT) Three records on 29 Oct, 10 Nov and 24 Dec 2010 at O-1(ET)	Four records on 13 Oct, 22 Oct, 27 Oct and 8 Nov 2010 at I-1 Six records on 13 Oct, 3 Nov, 5 Nov, 17 Nov, 6 Dec and 24 Dec 2010 at I-2 One record on 24 Dec 2010 at I-3 Nine records on 25 Oct, 5 Nov, 19 Nov, 22 Nov, 24 Nov, 26 Nov, 1 Dec, 15 Dec and 29 Dec 2010 at O-1(FT) Nine records on 25 Oct, 27 Oct, 5 Nov, 8 Nov, 12 Nov, 15 Nov, 13 Dec, 15 Dec and 29 Dec 2010 at O-1(ET)

7 Waste figures during the reporting period are summarized in the table below.

Status of Waste Management
Inert C&D Material Disposed of to Public Fill at Tuen Mun (m³)	24,652.4
Inert C&D Material Reused in this Contract (m³)	675.0
Inert C&D Material Reused in other Contract* (m³)	16,085.0
Metals Generated (kg)	18.0
Paper / Cardboard Packaging (kg)	400.0
Plastics (kg)	20.0
Chemical Waste (kg)	10,762.2
General Waste Disposed of to NENT Landfill (m³)	131.8

* Other Contracts include DC/2007/08, DC/2008/12, YL/2009/01, HY/2007/10, DC/2007/17 and Wo Shang Wai.

8 During the reporting period, two environmental complaints were received. EPD received two public complaints regarding daytime construction noise from outfall construction site on 17 November 2010. The complaints were about barge squeaking and rock breaking. The ET have conducted site inspection at the Outfall construction site and the Greenview Terrace (NSR 9) on 2 and 17 December 2010 to review and audit the site setting, noise mitigation measures implemented on-site and the environmental performance of the contractor. Enhanced on-site noise mitigation measures have been implemented by the contractor. A noise investigation report was submitted to the EPD on 24 December 2010. The issue of noise complaints was considered closed.

9 No Notification of Summons was received since the commencement of the Project.

Type of Monitoring	Monitoring Station ID	Parameter	Frequency
Air Quality Monitoring	ASR1; ASR3; ASR8 and ASR9	1-hour TSP	Once every 6 days
Noise Monitoring	NSR1; NSR3; NSR6; NSR8 and NSR9	Leq (30 min.)	Once every week
Water Quality Monitoring	I-1; I-1-C; I-2; I-2-C; I-3; I-3-C, O-1(FT), O-1-C(FT), O-1(ET) and O-1-C(ET)	DO (mg/l)	Three days per week
SS (mg/l)
Turbidity (NTU)
pH
Temperature (^oC)

Monitoring Station ID	Name of Premises
I-1	Intake I-1
I-1-C	Control of Intake I-1
I-2	Intake I-2
I-2-C	Control of Intake I-2
I-3	Intake I-3
I-3-C^	Control of Intake I-3
O-1 (FT) & (ET)*	Outfall 1During Flood Tide and Ebb Tide
O-1-C (FT)*#	Control of Outfall O-1 During Flood Tide
O-1-C (ET)*#	Control of Outfall O-1 During Ebb Tide

Station	1-hr TSP Level in μg/m³
ASR1	307	500
ASR3	327	500
ASR8	337	500
ASR9	329	500

Time Period	Action	Limit
0700 – 1900 hrs on normal weekdays	When one documented complaint is received	75dB(A)*

* For educational establishments the limit level shall be 70dB(A) and reduced to 65dB(A) during examination periods between 0700-1900 hrs on normal weekdays.

Table 3-6 Action & Limit Levels for Noise

Parameters	Action	Limit
DO in mg/L (Surface; Middle & Bottom)	Surface & Middle 5%-ile of baseline data for surface and middle layer. Bottom 5%-ile of baseline data for bottom layer.	Surface & Middle 4mg/l except 5mg/l for Fish Culture Zone (FCZ) or 1%-ile of baseline data for surface and middle layer Bottom 2mg/l or 1%-ile of baseline data for bottom layer
SS in mg/L (Depth-averaged)	95%-ile of baseline data or 120% of upstream control station’s SS at the same tide of the same day	99%-ile of baseline or 130% of upstream control station’s SS at the same tide of the same day and specific sensitive receiver water quality requirements (e.g. required suspended solids levels for concerned sea water intakes)
Turbidity (Tby) in NTU (Depth-averaged)	95%-ile of baseline data or 120% of upstream control station’s Tby at the same tide of the same day	99%-ile of baseline or 130% of upstream control station’s Tby at the same tide of the same day

Notes:

· For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.

· For SS and Tby, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

· 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.

Table 3-7 Action & Limit Levels for Water Quality

3.5 Monitoring Result

3.5.1 All measured air quality monitoring levels were complying with the Action and Limit Levels in the reporting period. A summary of air quality monitoring results is presented in Table 3-103-8 and Appendix F.

Monitoring Station	1-hour TSP (mg/m³)			Action Level	Limit Level
Monitoring Station	Range			(mg/m³)	(mg/m³)
ASR1	35.5	-	253.8	307	500
ASR3	24.1	-	277.0	327	500
ASR8	30.4	-	257.5	337	500
ASR9	28.5	-	312.6	329	500

Italic indicates the exceedances of Action Levels

Bold indicates the exceedances of Limit Levels

Table 3-8 Summary of Air Quality Monitoring Results

3.5.2 All measured noise monitoring levels were complying with Limit Levels in the reporting period. However, EPD received two noise complaints on 17 November 2010 that triggered the exceedances of action level during the reporting period. Investigation including site inspection, review and audit of noise mitigation measures implemented on-site and the Contractor’s environmental performance has been undertaken. Reports, including the nature of the complaints, observation of site inspections, proposed action taken and any further mitigation measures necessary to alleviate the impact, were submitted to EPD.

3.5.3 A summary of noise monitoring results is presented in Table 3-9 and Appendix F.

Monitoring Station	Leq (30mins) dB(A)			Limit Level
Monitoring Station	Range			dB(A)
NSR1	63	-	69	65/70
NSR3	59	-	71	75
NSR6	55	-	71	75
NSR8	60	-	70	75
NSR9	63	-	72	75

Bold indicates the exceedances of Limit Levels

Table 3-9 Summary of Impact Noise Monitoring Results

3.5.4 A summary of water quality monitoring results is presented in Table 3-10 and Appendix F.

3.5.5 None of exceedance related to project construction activities was recorded during reporting quarter but a total of 61 non project related exceedances were recorded.

River Water Quality Monitoring

3.5.7 A total of 7 non project related exceedances were recorded in October 2010 including:

· Two exceedances of turbidity (baseline) Limit Level were recorded at I-2 and I-3 on 15 October 2010. The measured turbidity levels on both cases were above the baseline Limit Level. Higher turbidity levels were recorded at the upstream control stations (I-2-C and I-3-C). On site mitigation measures had been implemented during the construction and direct disturbance of construction works was not observed from the sites. As such, the exceedances were considered to be contributed by natural variation and no further action was required.

· Four exceedances of SS Limit Level were recorded on 13, 22 and 27 at I-1 and I-2 and one exceedance of SS Action Level was recorded on 20 October 2010 at I-2. The measured SS levels at the impact monitoring stations were either 20% (Action Level) or 30% (Limit Level) more than the corresponding measurement results of the upstream control stations (I-1-C and I-2-C), where low SS levels were measured (between 2 mg/L and 2.9 mg/L). The SS results on these days were within the range of baseline SS concentration (1 - 8.5 mg/L). Since direct disturbance of construction works was not observed from the construction sites at I-1 and I-2 and suitable mitigation measures had been implemented, the exceedances were considered to be contributed by natural variation. No further action was required.

· Another exceedance of SS Action Level was recorded on 15 October 2010 at I-2. The measured SS level at the impact monitoring station was higher than 95 percentile of the baseline data. Higher SS level was measured at the upstream control station I-2-C. Since direct disturbance of construction works was not observed from the construction site at I-2 and suitable mitigation measures had been implemented, the exceedances were considered to be contributed by natural variation and the wet weather on that day (about 3.9 mm of rainfall were recorded at the Hong Kong Observatory on 15 October 2010). No further action was required.

3.5.7 A total of 7 non project related exceedances were recorded in November 2010 including:

· An exceedance of turbidity Action Level was recorded at I-1 on 5 November 2010. The measured turbidity level (10.45 NTU) was above baseline Action Level, but it was lower than the turbidity level measured at the upstream control station I-1-C (10.89 NTU). General site cleaning and housekeeping, dismantle formwork for Bay 19 spiral ramp, erection of formwork for Bay 22 and 23 spiral ramp, and horizontal drilling were undertaken during measurement. No direct disturbance was observed from the site and the turbidity result at monitoring station was below the level of control station. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of turbidity Limit Level was recorded at I-2 on 5 November 2010. The measured turbidity level (13.61 NTU) was above the Baseline Limit level. However, it was lower than the turbidity level measured at the upstream control station I-2-C (14.33 NTU). Construction activities including general site cleaning and housekeeping, excavation (hole drilling) at vortex drop shaft, excavation (rock splitting and mucking) at man access shaft, preparation work for skin wall, pipe jacking (rock breaking for 13th jacking pipe) at Portion G, and dismantling formwork for pile caps were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be due to natural variation and no action was required.

· An exceedance of SS Limit Level was recorded at I-2 on 3 November 2010. The measured SS level (2.90 mg/L) was below the baseline Action / Limit Level and was within the range of baseline SS concentration (1 - 8.5 mg/L). It was higher than the SS level measured at upstream control station I-2-C (2.0 mg/L). General site cleaning and housekeeping, install wire mesh and shotcreting at vortex drop shaft, excavation (hole drilling) at man access shaft, preparation work for skin wall, erect steel frame for ventilation system at 20T gantry, pipe jacking (rock breaking for 12th jacking pipe) at Portion G, and erect formwork and rebar fixing of pile caps at Portion G were undertaken during the measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Action Level was recorded at I-1 on 5 November 2010. The measured SS level (4.10 mg/L) was below the baseline Action Level. It was also within the range of baseline SS concentration (1 - 10.5 mg/L), but was higher than the SS level measured at upstream control station I-2-C (3.35 mg/L). General site cleaning and housekeeping, dismantle formwork for Bay 19 spiral ramp, erection of formwork for Bay 22 and 23 spiral ramp and horizontal drilling were undertaken during measurement. No direct disturbance was observed from the site. As such, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Limit Level was recorded at I-2 on 5 November 2010. The measured SS level (11.80 mg/L) was above the baseline Action / Limit Level. However, the measured SS level was below 120% of the control station’s (I-2-C) SS level (10.80 mg/L). General site cleaning and housekeeping, excavation (drilling holes and mucking) at vortex drop shaft, excavation (rock splitting and mucking) at man access shaft, preparation for skin wall, erect platform for air compressor, pipe jacking (rock breaking for 13^th jacking pipe) at Portion G, dismantle formwork for pile caps at Portion G were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Limit Level was recorded at I-1 on 8 November 2010. The measured SS level (3.35 mg/L) was below the baseline Action Level. It was also within the range of baseline SS concentration (1 - 10.5 mg/L), but was higher than the SS level measured at the upstream control station I-1-C (2.40 mg/L). General site cleaning and housekeeping, general cleaning at Bay 21 spiral ramp, dismantle formwork for Bay 22 spiral ramp, rebar fixing for Bay 23 spiral ramp, and horizontal drilling were undertaken during measurement. No direct disturbance was observed from the site. Hence, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Limit Level was recorded at I-2 on 17 November 2010. The measured SS level (4.05 mg/L) was below the baseline Action / Limit Level and within the range of baseline SS concentration (1 - 8.5 mg/L). However, it was more than 130% of the SS level measured at the upstream control station I-2-C (2.00 mg/L). General site cleaning and housekeeping, excavation (drilling holes and rock splitting) at vortex drop shaft, excavation (drilling holes) at man access shaft, preparation for skin wall, erection of the noise enclosure for ventilation fan, pipe jacking (rock breaking for the 14th jacking pipe) at Portion G, pipe jacking (jacking for the 13th concrete pipe) at Portion G, and erection of the 60-tonne temporary steel platform at Portion G were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

3.5.8 A total of 5 non project related exceedances were recorded in December 2010 including:

· An exceedance of SS Action Level was recorded at I-1 on 1 December 2010. The measured SS level (2.70 mg/L) was below the baseline Action / Limit Level and was within the range of baseline SS concentration (1 – 10.5 mg/L). It was higher than the SS level measured at upstream control station I-1-C (2.20 mg/L). General site cleaning and housekeeping, rebar fixing at Bay 23, formwork at Bay 23, horizontal drilling and GI monitoring were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Limit Level was recorded at I-2 on 6 December 2010. The measured SS level (3.20 mg/L) was below baseline Action / Limit Level and within the range of baseline SS concentration (1 - 8.5 mg/L), but was more than 130% of the SS level measured at the upstream control station (I-2-C)(2.00 mg/L). General site cleaning and housekeeping, excavation (drilling holes) at vortex drop shaft, excavation (drilling holes) at man access shaft, rock breaking for jacking pipe at Portion G and erection of 60 ton temporary steel platform at Portion G were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Limit Level was recorded at I-2 on 24 December 2010. The measured SS level (3.05 mg/L) was below baseline Action / Limit Level and within the range of baseline SS concentration (1 - 8.5 mg/L) but was more than 130% of the SS level measured at the upstream control station (I-2-C) (2.10 mg/L). General site cleaning and housekeeping, excavation (drilling holes) at vortex drop shaft and excavation (drilling holes) at man access shaft, rock breaking for 16^th jacking pipe at Portion G, erection of 60 ton temporary steel platform at Portion G and excavation for 750 step channel (SC) and catchpit were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Limit Level was recorded at I-3 on 24 December 2010. The measured SS level (4.15 mg/L) was below baseline Action / Limit Level and within the range of baseline SS concentration (1 - 7.5 mg/L) but was more than 130% of the SS level measured at the upstream control station (I-3-C) (2.00 mg/L). General site cleaning and housekeeping, PB wall H-pile extension, approach channel extension, and shaft excavation were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

· An exceedance of SS Action Level was recorded at I-2 on 31 December 2010. The measured SS level (2.45 mg/L) was below baseline Action / Limit Level and within the range of baseline SS concentration (1 - 8.5 mg/L) but was more than 120% of the SS level measured at the upstream control station (I-2-C) (2.00 mg/L). General site cleaning, housekeeping and temporary traffic arrangement (TTA), excavation (drilling holes) at vortex drop shaft, excavation (drilling holes and rock spilling) at man access shaft, closed formwork for dry flow channel, rock breaking for 16^th jacking pipe at Portion G, erection of 60 ton temporary steel platform at Portion G and excavation for 750 step channel (SC) and catchpit were undertaken during measurement. No direct disturbance was observed from the site. Thus, the exceedance was considered to be contributed by natural variation and no action was required.

Marine Water Quality Monitoring

3.5.9 A total of 16 non project related exceedances were recorded in October 2010 including:

· Four exceedances at O-1(FT) and five exceedances at O-1(ET) of DO baseline Limit Level were recorded on 25, 27 and 29 October 2010.

· Marine buoys and silt curtains were set up on 25 and 27 October 2010 and there was no dredging on these two days. As such, the eight exceedances of DO baseline limit on 25 and 27 October 2010 were considered due to natural variation.

· An exceedance of surface DO limit level was recorded at O-1(ET) (6.75 mg/L) during the ebb tide on 29 October 2010 (in contrast to the DO level of 7.44 mg/L measured at the upstream control station O-1-C(ET) during the same tide). During monitoring, silt curtains were deployed at the construction site and marine dredging was conducted within these curtains. Thus, any impact upon DO level associated with pollutants released from the marine sediment during dredging would only be confined within the construction site. As such, the surface DO exceedance at O-1(ET) was considered to be contributed by natural variation. No further action was required.

· An exceedance of turbidity baseline Limit Level was recorded on 25 October 2010 at O-1(FT) (14.13 NTU). High turbidity level was also recorded at the upstream control station O-1-C(FT) on the same tide of 25 October 2010 (13.77 NTU). As no marine dredging was conducted on that day, the exceedance was considered to be contributed by natural variation. No action was required.

· Three exceedances of SS Limit Level were recorded on 25 October 2010 at O-1(FT) and O-1(ET), and on 27 October 2010 at O-1(ET). Another exceedance of SS Action Level was recorded on 27 October 2010 at O-1(FT). As there were no dredging works undertaken in these two days, the exceedances were considered to be contributed by natural variation.

· An exceedance of SS Action Level was recorded on 29 October 2010 at O-1(ET). The SS level measured at O-1(ET) was 13.33 mg/L, which was more than 95 percentile of the baseline data. In contrast, higher SS level (17.15 mg/L) was recorded at the upstream control station at O-1-C(ET) on 29 October 2010. While marine dredging was undertaken at the outfall basin on the same day, mitigation measures had been adopted, including:

– Silt curtains deployed along the dredging boundary line and extended from the seawater level to the bottom of seabed;

– Frame-type silt curtain deployed for the marine mud dredging at the derrick barge;

– Closed grab dredging confined within the frame type silt curtain;

– Daily dredging rate limited to a maximum 960 m³;

– Silt curtain with sufficient slack to ensure the curtain rested on the seabed to cope with waves and tides.

– The condition of the silt curtains was checked by the supervisor on-broad per working day to ensure proper implementation and functioning prior to any marine works activities.

· Having considered the good forms of silt curtains and measures to limit SS generation, any SS dispersion was localised and limited within the construction site. Thus, the exceedance was considered to be contributed by natural variation. No further action was required.

3.5.10 A total of 17 non project related exceedances were recorded in November 2010 including:

· An exceedance of DO Action Level was recorded at the surface layer of O-1(FT) on 1 November 2010. The measured DO level (6.83 mg/L) was just below the baseline Action Level (6.84 mg/L). Dredging was conducted at the Outfall basin (portion E) on 1 November 2010. During monitoring, silt curtains were deployed along the dredging boundary line and extended from the seawater level to the seabed. Frame-type silt curtain had also been employed at the derrick barge and all dredging operation was confined in the frame-type silt curtain. Thus, any impact upon DO level associated with pollutants released from the marine sediment during dredging would only be confined within the construction site. As such, the exceedance was considered to be contributed by natural variation. No further action was required.

· Five exceedances of DO Limit Level were recorded at middle and bottom layers on 1 November and at surface, middle and bottom layers on 3 November 2010 respectively at O-1(FT). The measured DO levels (that varied from 6.51 to 6.70 mg/L) were below the baseline Action / Limit Level of the corresponding layer. (In contrast, the corresponding DO levels measured at the upstream control station O-1-C(FT) varied from 6.74 to 7.18 mg/L). Dredging was conducted at the Outfall basin (portion E) on both 1 and 3 November 2010. During monitoring, silt curtains were deployed along the dredging boundary line and extended from the seawater level to the seabed. Frame-type silt curtain had also been employed at the derrick barge and all dredging operation was confined in the frame-type silt curtain. Thus, any impact upon DO level associated with pollutants released from the marine sediment during dredging would only be confined within the construction site. As such, the exceedances were considered to be contributed by natural variation. No further action was required.

· An exceedance of Turbidity Limit Level was recorded at O-1(ET) on 8 November 2010. The measured SS level (depth-averaged) (14.28 NTU) at O-1(ET) was above the baseline Action/Limit Level but below the control station's SS level (O-1-C(ET)) (14.41 NTU) at the same tide of the same day. Dredging was undertaken at Portion E on 8 November 2010. Silt curtains had been deployed along the dredging boundary line and extended from the seawater level to the seabed. Frame-type silt curtain had been employed at the derrick barge and all dredging operation was confined in the frame-type silt curtain. As such, the exceedance was considered to be contributed by natural variation (high background level of SS) and no further action was required.

· Five exceedances of SS Limit Level were recorded on 5, 19, 22, 24 and 26 November 2010 at O-1(FT). The measured SS levels (varied from 8.83 to 12.42 mg/L) were below the baseline Action/Limit Level but was higher than 130% of the control station's SS level (O-1-C(FT)) (varied from 6.67 to 9.28 mg/L) at the same tide of the same day. No marine dredging activity was undertaken on 5 and 19 November 2010 and only rock removal at Portion E was undertaken on 22 and 24 November 2010. For 26 November 2010, rock removal at Portion E and installation of noise insulation blanket next to wire drums were undertaken. Silt curtains had been provided along Portion E boundary line and extended from seawater level to the bottom of seabed during the marine works. Frame / floating type silt curtains had also been employed at the derrick barge, and rock removal operation was confined in the inner (frame / floating type) silt curtain. As such, the exceedances were considered to be contributed by natural variation and no further action was required.

· Four exceedances of SS Limit Level were records on 5, 8, 12 and 15 November 2010 at O-1(ET). The measured SS levels (depth-averaged) (varied from 14.42 to 23.20 mg/L) were above the baseline Action / Limit Level. However, the measured SS levels were below the control station's SS level on 12 November 2010 (19.35 mg/L), below 120% of the control station's SS level on 5 and 8 November 2010 (13.23 and 22.00 mg/L respectively) and below 130% of the control station’s SS level on 15 November 2010 (11.72 mg/L). Since there was no dredging activity undertaken on 5 and 15 November 2010, the exceedances were considered not related to the construction activities. During the marine works on 8 November 2010 (dredging at Portion E) and 12 November 2010 (rock removal), mitigation measures had been implemented on-site. These included silt curtains provided along Portion E boundary line and extended from seawater level to the bottom of seabed, and frame / floating type silt curtains employed at the derrick barge. Dredging and rock removal operation were confined in the inner (frame / floating type) silt curtain. As such, the exceedances were considered to be contributed by natural variation and no further action was required.

· An exceedance of SS Action Level was recorded on 10 November 2010. The measured SS level (depth-averaged) (13.72 mg/L) at O-1(ET) was between the baseline Action Level and the Limit Level, and was below the control station's SS level (at O-1-C(ET)) (15.78 mg/L) at the same tide of the same day. Marine dredging was undertaken at the Outfall basin (Portion E) on 10 November 2010. Silt curtains had been deployed along the dredging boundary line and extended from the seawater level to the seabed. Frame-type silt curtain had been employed at the derrick barge and all dredging operation was confined in the frame-type silt curtain. As such, the exceedance was considered to be contributed by natural variation (high background level of suspended solids) and no further action was required.

3.5.11 A total of 9 non project related exceedances were recorded in December 2010 including:

· Two exceedances of SS Action Level were recorded on 3 and 22 December 2010 at O-1(FT). The measured SS levels (7.38 and 12.95 mg/L respectively) were below the baseline Action/Limit Level but was higher than 120% of the control station's SS level (O-1-C(FT)) (6.13 and 10.40 mg/L respectively) at the same tide of the same day. Only rock removal at Portion E on 3 December 2010 and armour rock removal from the sea wall to the derrick barge at Portion E on 22 December 2010 were undertaken during measurement. Silt curtains had been provided along Portion E boundary line and extended from seawater level to the bottom of seabed during the marine works. Frame / floating type silt curtains had also been employed at the derrick barge, and rock removal operation was confined in the inner (frame / floating type) silt curtain. As such, the exceedances were considered to be contributed by natural variation and no further action was required.

· Three exceedances of SS Limit Level were recorded on 1, 15 and 29 December 2010 at O-1(FT). The measured SS levels (varied from 3.20 to 7.83 mg/L) were below the baseline Action / Limit Level but higher than 130% of the control station's SS level (O-1-C(FT)) (varied from 2.37 to 5.28 mg/L) at the same tide of the same day. Only rock-fill removal from sea bed was undertaken on 1 December 2010 and no marine dredging activities were undertaken on 15 and 29 December 2010. As silt curtains were provided along Portion E boundary line and extended from seawater level to the bottom of seabed, frame / floating type silt curtains were deployed at the derrick barge, and dredging / rock removal operation were confined in the inner (frame / floating type) silt curtain. As such, the exceedances were considered to be contributed by natural variation and no further action was required.

· An exceedance of SS Action Level was recorded on 24 December 2010. The measured SS level (depth-averaged) (9.82 mg/L) at O-1(ET) was below the baseline Action/Limit Level but higher than 120% of the control station's SS level (O-1-C(ET)) (7.87 mg/L) at the same tide of the same day. No marine works was undertaken during measurement. As silt curtains had been deployed along the dredging boundary line and extended from the seawater level to the seabed and floating type silt curtain had been employed at the inner side, the exceedance was considered to be contributed by natural variation and no further action was required.

· Three exceedances of SS Limit Level were recorded on 13, 15 and 29 December 2010. The measured SS levels (depth-averaged) (9.20, 5.53 and 9.07 mg/L respectively) were below the baseline Action and Limit Level but higher than 130% of the control station's SS level (O-1-C(ET)) (5.18, 3.97 and 6.03 mg/L respectively) at the same tide of the same day. No marine works were undertaken on 13, 15 and 29 December 2010. As such, the exceedances were considered to be contributed by natural variation and no further action was required.

3.5.12 The above mentioned exceedances were considered not project related. However, proper mitigation measures had been implemented during measurements. Details of the above mentioned investigations could be referred to the Interim Notifications of Environmental Quality Limits Exceedances as enclosed in Appendix G.

Monitoring Station	Temperature			DO (mg/L)						pH			Turbidity (NTU)						Suspended Solid (mg/L)
	Range			Range			Action / Limit Level			Range			Range			Action / Limit Level			Range			Action / Limit Level
	Range			Range			Action / Limit Level			Range			Range			Action / Limit Level			Range			Action / Limit Level
I-1	17.20	-	29.70	5.05	-	8.06	3.42	/	3.34	7.50	-	8.91	2.39	-	10.45	9.75	/	12.47	2.00	-	7.45	8.85	/	10.17
I-1C	17.40	-	29.80	5.08	-	8.50		-		7.52	-	8.90	2.48	-	10.89		-		2.00	-	6.25		-
I-2	17.00	-	29.50	4.92	-	7.90	3.66	/	3.63	7.62	-	8.87	1.20	-	13.61	6.63	/	6.99	2.00	-	11.80	7.68	/	8.34
I-2C	17.10	-	29.50	5.11	-	8.27		-		7.61	-	8.88	1.25	-	14.33		-		2.00	-	11.20		-
I-3	17.00	-	29.35	5.02	-	7.90	3.65	/	3.51	7.60	-	8.90	1.23	-	7.80	3.99	/	4.18	2.00	-	6.05	6.13	/	7.23
I-3C	16.90	-	29.60	5.09	-	8.26		-		7.56	-	8.91	1.30	-	7.88		-		2.00	-	6.20		-

Note: Italic indicates the exceedances of Action Levels

Bold indicates the exceedances of Limit Levels

Table 3-10 Summary of Impact Water Quality Monitoring Results

Monitoring Station		Temperature			DO (mg/L)						pH			Turbidity (NTU)						Suspended Solid (mg/L)
		Range			Range			Action / Limit Level			Range			Range			Action / Limit Level			Range			Action / Limit Level
O-1(FT)	Surface	17.67	-	27.10	5.50	-	7.63	6.84	/	6.81	7.93	-	8.32	2.82	-	14.13	10.35	/	13.15	2.67	-	21.65	14.10	/	18.08
	Middle				5.88	-	7.65
	Bottom				5.87	-	7.89	6.99	/	6.96
O-1-C(FT)	Surface	17.58	-	26.83	5.62	-	7.67	-	/	-	7.87	-	8.33	3.01	-	13.77	-	/	-	2.33	-	24.32	-	/	-
	Middle				5.76	-	7.62
	Bottom				5.93	-	7.66
O-1(ET)	Surface	17.45	-	26.53	6.01	-	7.72	7.02	/	6.94	7.93	-	8.35	2.92	-	14.28	11.87	/	13.44	5.07	-	23.20	13.25	/	14.39
	Middle				6.26	-	7.71
	Bottom				6.24	-	7.70	6.70	/	6.48
O-1-C(ET)	Surface	16.92	-	26.67	5.96	-	7.79	-	/	-	7.97	-	8.40	2.90	-	14.41	-	/	-	3.97	-	22.00	-	/	-
	Middle				6.05	-	7.76
	Bottom				5.46	-	7.72

Note: Italic indicates the exceedances of Action Levels

Bold indicates the exceedances of Limit Levels

Table 3-11 Summary of Impact Marine Water Quality Monitoring Results

3.6 DO, Temperature and pH Data Monitored on 29 November 2010 and 1 December 2010

3.6.1 The previous calibration certificate for the multimeter (for pH, temperature and DO measurements) was expired on 27 November 2010 and the multimeter was recalibrated on 3 December 2010. Therefore, the water quality data (pH, temperature and DO) collected on 29 November 2010 and 1 Dec 2010 were not covered under a valid calibration certificate of the multimeter. Although the recalibration of the multimeter on 3 December 2010 indicated that the multimeter was functioning normally within acceptable deviations, it is considered that the water quality data (pH, temperature and DO) measured on 29 November 2010 and 1 December 2010 shall be considered for reference only. Nevertheless, it is noted that the pH, temperature and DO data monitored at various stations on 29 November 2010 are similar to the values measured on 26 November 2010 and on 1 December 2010 are similar to the values measured on 3 December 2010. Effluent discharges from the construction sites at I-1, I-2 and I-3 have been controlled under the wastewater discharge licenses. Mitigation measures were deployed at various construction sites during monitoring. These included: (1) silt curtains for marine works (rock removal) at the marine basin of Outfall; (2) wastewater treatment plants at I-1, I-2 and I-3; (3) diversion of existing streams that were bunded by sealed concrete block walls at I-1, I-2 and I-3; and (4) bunded off the existing stream by sand bag to prevent washing out of excavated material from the working area at I-2. Thus, adverse water quality impact on DO at various stations due to the Project on 29 November 2010 and 1 December 2010 was not anticipated.

3.7 Turbidity Data Monitored on 24 December 2010

3.7.1 The previous calibration certificate for the turbidimeter (serial no. 215619) was expired on 24 December 2010 and the turbidimeter was recalibrated on 28 December 2010. Therefore, the turbidity data collected on 24 December were not covered under a valid calibration certificate of the turbidimeter. The recalibration of the turbidimeter on 28 December 2010 indicated that the turbidimeter was functioning normally within acceptable deviations. However, the turbidity data measured on 24 December 2010 should be considered for reference only.

3.7.2 The turbidity levels measured at various control stations were higher than the turbidity level of the corresponding impact stations on 24 December 2010. Four-point on-site calibration of the turbidimeter was conducted before subsequent measurements and, thus, all measurements on 24 December 2010 were based on same calibration curve. The higher turbidity levels at control stations (where the water qualities were not affected by the project) and the relatively lower turbidity levels of the impact stations (where water qualities were or were not affected by the Project) showed that the Project did not contribute any significant adverse impact on the turbidity levels at the various impact monitoring stations.

3.7.3 In addition, effluent discharges from the construction sites at I-1, I-2 and I-3 have been controlled under the wastewater discharge licenses and mitigation measures were deployed at various construction sites during monitoring, including: (1) silt curtains for marine works (rock removal) at the marine basin of Outfall; (2) wastewater treatment plants at I-1, I-2 and I-3; and (3) diversion of existing streams that were bunded by sealed concrete block walls at I-1, I-2 and I-3, so the water quality of various locations are under sufficient protection. Therefore, adverse water quality impact on turbidity at various monitoring stations due to the Project on 24 December 2010 was not anticipated.

4 Quarterly Summary; Environmental Condition and Non-Compliance Records

4.1 Summary of Waste Disposal Records

4.1.1 According to the information provided by the Contractor; the quantities of C&D materials in the reporting period are summarized in Table 4-1

Status of Waste Management	October 10	November 10	December 10
Inert C&D Material Disposed of to Public Fill at Tuen Mun (m³)	5,386	6,581.8	12,684.6
Inert C&D Material Reused in this Contract (m3)	65	15.0	595.0
Inert C&D Material Reused in other Contract* (m3)	6,700	4430.0	4,955.0
Metals Generated (kg)	Nil	Nil	18.0
Paper / Cardboard Packaging (kg)	Nil	Nil	400.0
Plastics (kg)	Nil	Nil	20.0
Chemical Waste (kg)	2,392.0	920.0	7,450.2
General Waste Disposed of to NENT Landfill (m3)	34.6	41.2	56.0

* Other Contracts include DC/2007/08, DC/2008/12, YL/2009/01, HY/2007/10, DC/2007/17 and Wo Shang Wai.

Table 4-1 Waste Generated from October to December 2010

4.2 Weather Conditions

4.2.1 The weather conditions during the period from October to December 2010 were mainly sunny, fine, cloudy and rainy.

4.3 Summary of Project-Related Exceedances

4.3.1 Summary of exceedance results are summarized in Table 4-2. Appendix G shows the Interim Notifications of Environmental Quality Limits Exceedances issued in the reporting period.

Environmental Monitoring	Total No. of Measurement	Action Level Exceedance	% of Action Level Exceedance	Limit Level Exceedance	% of Limit Level Exceedance
Air Quality	192	0	0	0	0
Noise	67	2 (complaints)	2.99	0	0
Water	350	0	0	0	0

Table 4-2 Summary of Project- related Exceedances

5 Complaint

5.1.1 A complaint hotline at 9850 3241 of the Contractor has been established for the Project.

5.1.2 During the reporting period, two environmental complaints were received. EPD received two public complaints regarding daytime construction noise from outfall construction site on 17 November 2010. The complaints were about barge squeaking and rock breaking. The ET have conducted site inspection at the Outfall construction site and the Greenview Terrace (NSR 9) on 2 and 17 December 2010 to review and audit the site setting, noise mitigation measures implemented on-site and the environmental performance of the contractor. Enhanced on-site noise mitigation measures were implemented by the contractor. A noise investigation report was submitted to the EPD on 24 December 2010. The issue of noise complaints was considered closed. Details of the complaint investigation and observations can be referred to Appendix H.

5.1.3 Cumulative statistics of environmental complaints are shown in Table 5-1.

Complaints Received in the Reporting Period	Cumulative Number of Complaints
2	20

Table 5-1 Cumulative Statistics of Environmental Complaints

6 Summary of Notification of Summons, Successful Prosecutions and Corrective Actions

6.1.1 No summons and successful prosecution was received during the reporting period.

6.1.2 Cumulative statistics of Notification of Summon; Successful Prosecutions and Convictions are shown in Table 6-1.

Notification of Summons		Successful Prosecution
October – December 10	Cumulative	October – December 10	Cumulative
0	0	0	0

Table 6-1 Cumulative Statistics of Notification of Summons and Successful Prosecutions

7 Comments, Recommendations and Conclusion

7.1.1 During the reporting period, no project related exceedance of air quality monitoring was recorded. No exceedance of noise limit level was recorded, but EPD received two noise complaints on 17 November 2010 that triggered the exceedances of action level. Finally, Exceedances of water quality monitoring were recorded but none of these exceedances were related to Project’s construction activities.

7.1.2 EPD received two public complaints regarding daytime construction noise from outfall construction site on 17 November 2010. The complaints were about barge squeaking and rock breaking. The ET have conducted site inspection at the Outfall construction site and the Greenview Terrace (NSR 9) on 2 and 17 December 2010 to review and audit the site setting, noise mitigation measures implemented on-site and the environmental performance of the contractor. Enhanced on-site noise mitigation measures have been implemented by the contractor. A noise investigation report was submitted to the EPD on 24 December 2010. The issue of noise complaints was considered closed.

7.1.3 No Notification of Summons has been received since the commencement of the Project.

7.1.4 Waste management mitigation measures have been implemented by the Contractor within the reporting period. Waste figures during the reporting period are summarized in Table 7-1.

Status of Waste Management
Inert C&D Material Disposed of to Public Fill at Tuen Mun (m³)	24,652.4
Inert C&D Material Reused in this Contract (m³)	675.0
Inert C&D Material Reused in other Contract* (m³)	16,085.0
Metals Generated (kg)	18.0
Paper / Cardboard Packaging (kg)	400.0
Plastics (kg)	20.0
Chemical Waste (kg)	10,762.2
General Waste Disposed of to NENT Landfill (m³)	131.8

* Other Contracts include DC/2007/08, DC/2008/12, YL/2009/01, HY/2007/10, DC/2007/17 and Wo Shang Wai.

Table 7-1 Total Wastes Generated From October to December 2010

Monitoring Station ID	Name of Premises	Floor Level
ASR1	Sik Sik Yuen Ho Fung College	G/F
ASR3	Hong Hoi Chee Hong Temple	Podium
ASR8	Beach Tower (Long Beach Gardens)	G/F
ASR9	Greenview Terrace (Block 1)	G/F