TABLE OF CONTENTS

 

1.            INTRODUCTION  Error! Bookmark not defined.

2.            BASIC PROJECT INFORMATION  Error! Bookmark not defined.

3.            ROUTINE IMPACT WATER QUALITY MONITORING  

4.            24-HR WATER QUALITY MONITORING  

5.            ENVIRONMENTAL SITE INSPECTION AND AUDIT 

6.            EXCEEDANCE OF THE ENVIRONMENTAL PARAMETERS 

7.            NON-COMPLIANCE, COMPLAINTS, NOTIFICATION OF SUMMONS AND PROSECUTION 

8.            CONCLUSIONS 


TABLES:

Table I          Summary of Water Quality Exceedances – Routine Impact Monitoring (In-situ)                              

Table II          Summary of Water Quality Exceedances – Routine Impact Monitoring (Laboratory Analysis)            

Table III         Summary of the Exceedances Recorded in Reporting Month – 24-hr Monitoring              

Table 2.1       Key Personnel Contact of the Contract Error! Bookmark not defined.

Table 2.2       Detailed Dredging Quantity  8

Table 2.3       Status of Environmental Licences, Notification and Permits  9

Table 3.1       Laboratory Measurement/Analysis Methods and Reporting Limits  11

Table 3.2       Water Quality Monitoring and Sampling Equipment 12

Table 3.3       Monitoring Parameters and Frequency  13

Table 3.4       Water Quality Monitoring Parameters  14

Table 3.5       Locations of Water Quality Monitoring Stations  Error! Bookmark not defined.

Table 3.6       Summary of Water Quality Exceedance (In-situ Measurement) Error! Bookmark not defined.

Table 3.7       Summary of Water Quality Exceedance (Laboratory Analysis) Error! Bookmark not defined.

Table 4.1       24 Hours Water Quality Monitoring Equipment 20

Table 4.2       24-hr Water Quality Monitoring Parameters  21

Table 4.3       Location of Water Quality Monitoring Station  21

Table 4.4       Summary of Water Quality Exceedance (24-hr Monitoring) 22

Table 5.1      Compliance with EP Conditions in the Reporting Month  23

Table 5.2       Waste Quantities of Dredging Works  24

Table 7.1       Environmental Complaints Log  Error! Bookmark not defined.

Table 7.2       Cumulative Statistics on Complaints  Error! Bookmark not defined.

Table 7.3       Cumulative Statistics on Successful Prosecutions  Error! Bookmark not defined.

 

FIGURES:

Figure 1   Project General Layout

Figure 2   Dredging Work Location during the Reporting Period

Figure 3   Locations of Water Quality Monitoring Stations

 

APPENDICES:

Appendix A

Project Organization Chart

Appendix B

Construction Programme

Appendix C

Action and Limit Levels

Appendix D

Copies of Calibration Certificates

Appendix E

Schedule of Water Quality Monitoring

Appendix F

Water Quality Monitoring Results and Graphical Presentation – Routine Impact Monitoring

Appendix G

Water Quality Monitoring Results and Graphical Presentation – 24-hr Monitoring

Appendix H

Event and Action Plans

Appendix I

Details of Notification of Exceedances

Appendix J

Environmental Mitigation Implementation Schedule

Appendix K

Waste Generation in Reporting Period

Appendix L

Weather Conditions and Red Tide Occurrences for the Reporting Month

       


EXECUTIVE SUMMARY

 

i.        This is the Sixth Monthly Environmental Monitoring Audit (EM&A) Monthly Report – October 2014 for Contract No. CV/2013/04 – Dredging Works in Kwai Tsing and its Approach Channel (Agreement No. CE63/2008 – Providing Sufficient Water Depth for Kwai Tsing Container Basin and its Approach Channel). The dredging works commenced on 23 April 2014. This report presents the environmental monitoring and audit works conducted from 23 September 2014 to 22 October 2014.

 

ii.      Construction Activities for the Reporting Period

During this reporting period, the principal work activities included:

· Dredging at Portion A / Zone 1A, Zone 1B, Zone 3A, Zone 3B and Zone 4A in EP

· Dredging at Portion B / Zone 5A, Zone 5B, Zone 6A, Zone 6B, Zone 6C and Zone 6D in EP

· Dredging at Portion D / Zone 13A in EP

· Dredging at Portion E / Zone 13B in EP

 

iii.    Water Quality Monitoring

Routine impact water quality monitoring at 22 designated monitoring stations namely C1, C2, C3, G1, G2, G3, G4, G5, G6, SR1, SR2, SR3, SR4, SR5, SR6, SR7, SR8, SR9, SR10, SR11, SR12, SR13 were conducted during the reporting period. Exceedances of DO, Turbidity, Total Suspended Solids and TIN (in-situ & lab) were recorded at various monitoring stations, detail of exceedance are summarized in Table I and II. However, investigation indicated these exceedances were not related to the Project works.

 

Table I        Summary of Water Quality Exceedances – Routine Impact Monitoring (In-situ)

Station

Exceedance Level

DO (S&M)

DO (B)

Turbidity

NH3-N

UIA

TIN

Total

 

 

E

F

E

F

E

F

E

F

E

F

E

F

E

F

SR1

Action

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

0

0

0

0

1

0

0

0

0

0

-

-

1

0

SR2

Action

0

1

2

0

0

0

0

0

0

0

-

-

2

1

Limit

12

7

10

10

1

1

0

0

0

0

-

-

23

18

SR3

Action

1

1

2

1

0

3

0

0

0

0

-

-

3

5

Limit

10

6

10

9

1

0

0

0

0

0

-

-

21

15

SR4

Action

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

0

0

0

0

0

0

0

0

0

0

-

-

0

0

SR5

Action

0

0

0

0

2

1

-

-

-

-

1

0

3

1

Limit

8

7

9

9

0

2

-

-

-

-

12

13

29

31

SR6

Action

0

0

0

0

4

3

0

0

0

0

-

-

4

3

Limit

13

13

13

13

6

7

0

0

0

0

-

-

32

33

SR7

Action

0

0

0

0

4

3

0

0

0

0

-

-

4

3

Limit

8

8

11

10

0

0

0

0

0

0

-

-

19

18

SR8

Action

1

1

0

0

6

6

0

0

0

0

-

-

7

7

Limit

11

11

13

13

4

4

0

0

0

0

-

-

28

28

SR9

Action

1

0

1

2

2

4

-

-

-

-

0

1

4

7

Limit

4

6

10

8

8

5

-

-

-

-

6

6

28

25

SR10

Action

3

1

0

0

6

4

-

-

-

-

4

4

13

9

Limit

10

11

13

13

1

3

-

-

-

-

5

4

29

31

SR11

Action

0

0

0

0

5

5

-

-

-

-

5

2

10

7

Limit

12

11

13

13

1

2

-

-

-

-

3

3

29

29

SR12

Action

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

0

0

0

0

0

0

0

0

0

0

-

-

0

0

SR13

Action

0

0

0

1

0

0

-

-

-

-

-

-

0

1

Limit

13

12

13

12

0

0

-

-

-

-

-

-

26

24

Total

Action

6

4

5

4

29

29

0

0

0

0

10

7

94

Limit

101

92

115

110

23

24

0

0

0

0

26

26

517

Table II       Summary of Water Quality Exceedances – Routine Impact Monitoring (Laboratory Analysis)

Station

Exceedance Level

Suspended Solids

BOD5

E. coli

NH3-N

UIA

Synthetic Detergent

 

TIN

Total

 

 

E

F

E

F

E

F

E

F

E

F

E

F

E

F

E

F

SR1

Action

0

0

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

5

5

0

0

0

0

0

0

0

0

0

0

-

-

5

5

SR2

Action

1

2

-

-

-

-

0

0

0

0

-

-

-

-

1

2

Limit

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

SR3

Action

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

Limit

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

SR4

Action

0

0

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

1

2

0

0

0

0

0

0

0

0

0

0

-

-

1

2

SR5

Action

0

1

-

-

-

-

0

0

0

0

-

-

1

1

1

2

Limit

0

0

-

-

-

-

0

0

0

0

-

-

3

3

3

3

SR6

Action

4

4

-

-

-

-

0

0

0

0

-

-

-

-

4

4

Limit

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

SR7

Action

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

Limit

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

SR8

Action

1

0

-

-

-

-

0

0

0

0

-

-

-

-

1

0

Limit

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

SR9

Action

4

2

-

-

-

-

0

0

0

0

-

-

0

0

4

2

Limit

0

0

-

-

-

-

0

0

0

0

-

-

0

0

0

0

SR10

Action

0

0

-

-

-

-

0

0

0

0

-

-

0

0

0

0

Limit

0

0

-

-

-

-

0

0

0

0

-

-

0

0

0

0

SR11

Action

0

0

-

-

-

-

0

0

0

0

-

-

0

0

0

0

Limit

0

0

-

-

-

-

0

0

0

0

-

-

0

0

0

0

SR12

Action

0

0

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

3

4

0

0

0

0

0

0

0

0

0

0

-

-

3

4

SR13

Action

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

Limit

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

Total

Action

10

9

0

0

0

0

0

0

0

0

0

0

1

1

21

Limit

9

11

0

0

0

0

0

0

0

0

0

0

3

3

26

 

Among the 22 monitoring stations, supplementary 24-hr water quality monitoring was also conducted at 7 of the stations, which are SR4, SR5, SR9, SR10, SR11, SR12 and SR13. Exceedances of DO and Turbidity were recorded at various monitoring stations, detail of exceedance are summarized in Table III. However, investigation indicated these exceedances were not related to the Project works.

 


Table III    Summary of the Exceedances Recorded in Reporting Month – 24-hr Monitoring

Station

Exceedance Level

Turbidity

DO

NH3-N

Total

SR4

Action

0

0

0

0

Limit

4

0

0

4

SR5

Action

111

54

-

165

Limit

27

841

-

868

SR9

Action

472

57

-

529

Limit

332

292

-

624

SR10

Action

352

36

-

388

Limit

34

1309

-

1343

SR11

Action

48

39

-

87

Limit

4

1263

-

1267

SR12

Action

0

0

0

0

Limit

54

0

0

54

SR13

Action

0

5

-

5

Limit

6

1397

-

1403

Total

Action

983

191

0

1174

Limit

461

5102

0

5563

 

iii.    Waste Management

There was marine sediment (Type 1 – Open Sea Disposal and Type 2 – Confined Marine Disposal) disposed to East Sha Chau Pit IVc or Va and South of Brothers CMP1 or CMP2. No inert or non-inert C&D material related to dredging works and a small amount of general refuse were disposed off site in the reporting month.

 

iv.    Non-Compliance, Complaints, Notifications of Summons and Successful Prosecutions

No complaint, notification of prosecutions or summons was received in the reporting period.

 

Leakage incident was reported at around 04:35 am on 14 October 2014 during the dredging operation at TMTA Grid No. F16 (Portion B, Z5A) in the Container Basin. The loading compartment of the barge was suddenly partially opened and the dredged Cat Hp sediment (Type II) seeped back within Zone 1B. Investigation was carried out immediately and identified that a very rare inconsistent power supply with the damage of electric breaker condition occurred and caused the lost of control on the magnetic pressure valve. The error was immediately rectified by replacing a new device and the loading compartment was back to normal operation. The dredging works was then resumed at around 05:15 a.m. on 14 October 2014, preventive measures was implemented afterwards. Analysis of water quality monitoring data as well as seawater metal levels indicated the impact of the incident is considered not significant. Adequate corrective measures shall be implemented by the Contractor to avoid recurrence of such incident. Incident report on the leakage is under review and will be provided in subsequent EM&A report.

 

v.      Site Inspections and Audit

The Environmental Team conducted 4 site inspections in the reporting period. No particular observation related to the dredging work was found in the reporting month. The Contractor is reminded to use well maintained mechanical equipment to reduce black smoke emission from the chimney of vessels. Good housekeeping should be maintained in site area, including using drip tray for storage of mechanical fuel and paint solvent and keeping the drainage area clean. The Contractor is also reminded to maintain good dredging work practice, including steady transfer of grab bucket, extension of retention time above silt curtain cage, lowering of grab bucket into the hopper barge and close the grab bucket while back transferring to the silt curtain cage. Chemical waste producer license application was in progress during the reporting period, chemical waste will be stored properly if produced.

 

vi.    Compliance with Specific EP conditions

Implementation of contractor’s mitigation for dredging work and the associated dredging records were checked. It was concluded that the dredging is conducted orderly in compliance with the EP requirements on site mitigation measures in general.

 

vii.  Construction Activities for the Coming Reporting Period

During the coming reporting period, the principal work activities include:

· Dredging at Portion A / Zone 1A, Zone 1B, Zone 2C, Zone 3A, Zone 3B and Zone 4A in EP

· Dredging at Portion B / Zone 5A, Zone 5B, Zone 6A, Zone 6B, Zone 6C and Zone 6D in EP

· Dredging at Portion E / Zone 13B in EP

 

Future Key Issues include:

·         Regular inspection on silt curtain deployment

·         Regular inspection on silt screen deployment

·         Implementation of EM&A Programme

·         Maintain dredging below allowable dredging rate in EP.

·         Cleaning of excess material from the decks and exposed fittings of barges and dredgers before the vessel is moved.

· Barge loading shall be monitored to ensure material is not lost during transportation.

· Conditions in dumping permit shall be followed strictly.

· Field trial dredging and monitoring at Zone 2C subzones