TABLE OF CONTENTS

 

EXECUTIVE SUMMARY                                                                                                     

1.         INTRODUCTION

2.         BASIC PROJECT INFORMATION

3.         EM&A REQUIREMENTS – ROUTINE IMPACT MONITORING

4.         EM&A REQUIREMENTS – 24-HR WATER QUALITY MONITORING

5.         ENVIRONMENTAL SITE INSPECTION AND AUDIT

6.         COMPLAINTS, NOTIFICATION OF SUMMONS AND PROSECUTION

7.         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

Table 2‑2       Detail Dredging Quantity 

Table 3‑1       Monitoring Parameters and Frequency  Error! Bookmark not defined.

Table 3‑2       Water Quality Monitoring Parameters 

Table 3‑3       Summary of Water Quality Exceedance (In-situ Measurement)

Table 3‑4       Summary of Water Quality Exceedance (Laboratory Analysis)

Table 4‑1       24-hr Water Quality Monitoring Parameters 

Table 4‑2       Summary of Water Quality Exceedance (24-hr Monitoring)

Table 5‑1       Waste Quantities of Dredging Works 

Table 5‑2       Comparison of Quarterly Mean to Baseline Mean 

Table 5‑3       Summary of Statistical Analysis 

Table 6‑1       Environmental Complaints Log  

Table 6‑2       Cumulative Statistics on Complaints 

Table 6‑3       Cumulative Statistics on Successful Prosecutions 

 

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

Graphical Presentation – Routine Impact Monitoring Results

Appendix E

Graphical Presentation – 24-hr Monitoring Results

Appendix F

Environmental Mitigation Implementation Schedule

Appendix G

Waste Generation in Reporting Period

Appendix H

Quarterly Assessment of Construction Impacts

           


EXECUTIVE SUMMARY

 

i.        This is the First Quarterly Environmental Monitoring Audit (EM&A) Report – May - July 2014 for Contract No. CV/2013/04 – Dredging Works in Kwai Tsing and its Approach Channel (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 April 2014 to 22 July 2014.

 

ii.      Construction Activities for the Reporting Period

During this reporting period, the principal work activities included:

 

May 2014

June 2014

July 2014

Dredging at Portion D / Zone 13A in EP (Figure 1).

Dredging at Portion D / Zone 13A in EP (Figure 1).

Dredging at Portion D / Zone 13A in EP (Figure 1).

 

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 and SR13 were conducted during the reporting period. Exceedances of DO, Turbidity, Suspended Solids, NH3-N (lab) and TIN (in-situ & lab) were recorded at various monitoring stations, detail of exceedance are summarized in Table I and Table 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

0

0

0

0

0

0

 -

- 

0

0

SR2

Action

1

2

1

1

0

0

0

0

0

0

 -

- 

2

3

Limit

16

16

21

24

1

0

0

0

0

0

 -

- 

38

40

SR3

Action

1

1

1

2

0

0

0

0

0

0

 -

- 

2

3

Limit

15

16

19

24

0

0

0

0

0

0

 -

- 

34

40

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

1

0

0

0

0

0

 -

- 

- 

- 

0

1

1

1

Limit

6

8

17

18

0

0

 -

- 

- 

- 

29

31

52

57

SR6

Action

2

1

0

0

3

4

0

0

0

0

 -

- 

5

5

Limit

26

27

29

30

2

2

0

0

0

0

 -

- 

57

59

SR7

Action

0

1

0

0

1

5

0

0

0

0

 -

- 

1

6

Limit

22

29

29

31

0

0

0

0

0

0

 -

- 

51

60

SR8

Action

1

0

0

0

0

2

0

0

0

0

 -

- 

1

2

Limit

19

21

26

29

1

2

0

0

0

0

 -

- 

46

52

SR9

Action

1

2

0

0

1

3

 -

- 

- 

- 

12

12

14

17

Limit

10

9

26

26

0

0

 -

- 

- 

- 

9

12

45

47

SR10

Action

2

3

0

1

2

3

 -

- 

- 

- 

10

8

14

15

Limit

8

10

21

22

0

0

 -

- 

- 

- 

13

18

42

50

SR11

Action

1

1

0

0

1

2

 -

- 

- 

- 

12

11

14

14

Limit

11

11

19

20

0

0

 -

- 

- 

- 

7

9

37

40

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


 

Station

Exceedance Level

DO (S&M)

DO (B)

Turbidity

NH3-N

UIA

TIN

Total

SR13

Action

3

0

1

2

0

0

 -

- 

- 

- 

 -

- 

4

2

Limit

18

24

26

28

0

0

 -

- 

- 

- 

 -

- 

44

52

Total

Action

13

11

3

6

8

19

0

0

0

0

34

32

126

Limit

151

171

233

252

4

4

0

0

0

0

58

70

943

 

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

0

0

0

0

0

0

0

0

0

0

0

0

 -

- 

0

0

SR2

Action

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

 -

- 

0

0

Limit

0

0

 -

 -

- 

- 

2

2

0

0

 -

- 

 -

- 

2

2

SR3

Action

0

0

 -

 -

- 

- 

0

2

0

0

 -

- 

 -

- 

0

2

Limit

0

0

 -

 -

- 

- 

2

3

0

0

 -

- 

 -

- 

2

3

SR4

Action

0

0

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

 -

- 

0

0

SR5

Action

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

0

2

0

2

Limit

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

29

32

29

32

SR6

Action

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

 -

- 

0

0

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

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

 -

- 

0

0

Limit

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

 -

- 

0

0

SR9

Action

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

9

10

9

10

Limit

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

7

7

7

7

SR10

Action

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

5

9

5

9

Limit

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

9

8

9

8

SR11

Action

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

6

6

6

6

Limit

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

2

2

2

2

SR12

Action

0

0

0

0

0

0

0

0

0

0

0

0

 -

- 

0

0

Limit

1

0

0

0

0

0

0

0

0

0

0

0

 -

- 

1

0

SR13

Action

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

 -

- 

0

0

Limit

0

0

 -

- 

- 

- 

0

0

0

0

 -

- 

 -

- 

0

0

Total

Action

0

0

0

0

0

0

0

2

0

0

0

0

20

27

49

Limit

1

0

0

0

0

0

4

5

0

0

0

0

47

49

106

 

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 Quarter – 24-hr Monitoring

Station

Exceedance Level

Turbidity

DO

NH3-N

Total

SR4

Action

0

0

0

0

Limit

21

45

0

66

SR5

Action

161

59

-

220

Limit

651

1374

-

2025

SR9

Action

634

124

-

758

Limit

175

251

-

426

SR10

Action

646

61

-

707

Limit

355

708

-

1063

SR11

Action

361

232

-

593

Limit

506

844

-

1350

SR12

Action

1

0

0

1

Limit

141

14

0

155

SR13

Action

4

105

-

109

Limit

197

2194

-

2391

Total

Action

1807

581

0

2388

Limit

2046

5430

0

7476

 

iii.    Waste Management

There was marine sediment (Type 1 – Open Sea 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 quarter.

 

iv.    Complaints, Notifications of Summons and Successful Prosecutions

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

 

v.      Site Inspections and Audit

The Environmental Team conducted 13 site inspections in the reporting period. No particular observation related to the dredging work was found in the reporting quarter.

 

During joint party visit on 29th May 2014, it is agreed that rectification measures will be implemented by the Contractor to prevent leakage of dredged mud during transfer from silt curtain cage to the hopper barge. The measures proposed by Contractor include enforcement of daily check of grab dredger, employment of better dredging operation practice like 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.

 

A suspected leakage of silt curtain was reported on 2nd July, while during site inspection on 3rd July, no leakage was observed during operation. The Contractor reported that investigation revealed the suspected case is due to overflow of surface water from the silt curtain cage. Water quality monitoring showed no project-related exceedance during the period. The Contractor was reminded to monitor the condition of the silt curtain closely, and rectify if any leakage was found.

 

Pursuant to Condition 3.4 of the EP, the Contractor has arranged a monitoring brief, on 2nd July, for the dredging works staff about the possibility of locating archaeological objects according to the requirement set out in Section 8.1 of the EM&A Manual. According to the Contractor, plan for monitoring dredged spoil, notification procedure and the relevant records will be provided for agreement prior to the commencement of dredging at the location with identified archaeological potential.

 

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.

 

vii.  Construction Activities for the Coming Reporting Period

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

·         Dredging at Portion D

·         Dredging at Portion A

 

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.