TABLE OF CONTENTS

 

EXECUTIVE SUMMARY                                                                                                                          

1.           INTRODUCTION   5

2.           BASIC PROJECT INFORMATION   7

3.           EM&A REQUIREMENTS – ROUTINE IMPACT MONITORING   11

4.           EM&A REQUIREMENTS – 24-HR WATER QUALITY MONITORING   16

5.           ENVIRONMENTAL SITE INSPECTION AND AUDIT   19

6.           COMPLAINTS, NOTIFICATION OF SUMMONS AND PROSECUTION   26

7.           CONCLUSIONS   27


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 Period – 24-hr Monitoring                             

Table 2‑1     Key Personnel Contact of the Contract 7

Table 2‑2     Detail Dredging Quantity  8

Table 3‑1     Monitoring Parameters and Frequency  11

Table 3‑2     Water Quality Monitoring Parameters  12

Table 3‑3     Summary of Water Quality Exceedance (In-situ Measurement) 13

Table 3‑4     Summary of Water Quality Exceedance (Laboratory Analysis) 14

Table 4‑1     24-hr Water Quality Monitoring Parameters  16

Table 4‑2     Summary of Water Quality Exceedance (24-hr Monitoring) 17

Table 5‑1     Waste Quantities of Dredging Works  20

Table 5‑2     Comparison of Quarterly Mean to Baseline Mean  22

Table 5‑3     Summary of Statistical Analysis  25

Table 6‑1     Environmental Complaints Log  26

Table 6‑2     Cumulative Statistics on Complaints  26

Table 6‑3     Cumulative Statistics on Successful Prosecutions  26

 

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 Fourth Quarterly Environmental Monitoring Audit (EM&A) Report – February 2015 - April 2015 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 January 2014 to 22 April 2015.

 

ii.      Construction Activities for the Reporting Period

During this reporting period, the principal work activities included:

 

February 2014

March 2014

April 2015

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

·  Dredging at Portion B / Zone 6B, Zone 6C,  Zone 6D, Zone 7 and Zone 8 in EP

·  Dredging at Portion C / Zone 12 in EP

 

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

·  Dredging at Portion B / Zone 5A, 5B, 5C, Zone 6A, 6B, 6C and Zone 7 in EP

·  Dredging at Portion C / Zone 9 and Zone 11 in EP

 

·  Dredging at Portion A / Zone 1B, Zone 2A1, 2A2, 2C1, 2C2, 2C3 and 2C4 in EP

·  Dredging at Portion B / Zone 5B, 5C, Zone 6A, 6B, 6C, 6D Zone 7 and Zone 8 in EP

·  Dredging at Portion C / Zone 9 and Zone 11 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 and SR13 were conducted during the reporting period. Exceedances of Turbidity, NH3-N (in-situ & lab), TIN (in-situ & lab) and Suspended Solids 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

0

0

0

0

0

0

-

-

0

0

SR2

Action

0

0

0

0

0

0

0

3

0

0

-

-

0

3

Limit

0

0

0

0

0

0

3

0

0

0

-

-

3

0

SR3

Action

0

0

0

0

0

0

3

2

0

0

-

-

3

2

Limit

0

0

0

0

0

0

1

1

0

0

-

-

1

1

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

1

0

-

-

-

-

2

6

3

6

Limit

0

0

0

0

0

0

-

-

-

-

16

16

16

16

SR6

Action

0

0

0

0

2

2

-

-

-

-

-

-

2

2

Limit

0

0

0

0

1

1

-

-

-

-

-

-

1

1

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

1

1

-

-

-

-

-

-

1

1

Limit

0

0

0

0

0

0

-

-

-

-

-

-

0

0

SR9

Action

0

0

0

0

1

1

-

-

-

-

7

11

8

12

Limit

0

0

0

0

0

0

-

-

-

-

14

13

14

13

SR10

Action

0

0

0

0

2

2

-

-

-

-

6

5

8

7

Limit

0

0

0

0

0

0

-

-

-

-

0

2

0

2

SR11

Action

0

0

0

0

1

1

-

-

-

-

8

7

9

8

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

Limit

0

0

0

0

0

0

0

0

0

0

-

-

0

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

8

7

3

5

0

0

23

29

75

Limit

0

0

0

0

1

1

4

1

0

0

32

33

72

 

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

2

1

0

0

0

0

0

0

0

0

0

0

-

-

2

1

SR2

Action

0

0

-

-

-

-

2

5

0

0

-

-

-

-

2

5

Limit

0

0

-

-

-

-

3

1

0

0

-

-

-

-

3

1

SR3

Action

0

0

-

-

-

-

5

4

0

0

-

-

-

-

5

4

Limit

0

0

-

-

-

-

1

3

0

0

-

-

-

-

1

3

SR4

Action

0

0

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

0

3

0

0

0

0

0

0

0

0

0

0

-

-

0

3

SR5

Action

0

0

-

-

-

-

-

-

-

-

-

-

6

7

6

7

Limit

0

0

-

-

-

-

-

-

-

-

-

-

20

21

20

21

SR6

Action

2

3

-

-

-

-

-

-

-

-

-

-

-

-

2

3

Limit

0

0

-

-

-

-

-

-

-

-

-

-

-

-

0

0

SR7

Action

0

0

-

-

-

-

-

-

-

-

-

-

-

-

0

0

Limit

0

0

-

-

-

-

-

-

-

-

-

-

-

-

0

0

SR8

Action

0

0

-

-

-

-

-

-

-

-

-

-

-

-

0

0

Limit

0

0

-

-

-

-

-

-

-

-

-

-

-

-

0

0

SR9

Action

0

1

-

-

-

-

-

-

-

-

-

-

8

10

8

11

Limit

0

0

-

-

-

-

-

-

-

-

-

-

16

17

16

17

SR10

Action

0

0

-

-

-

-

-

-

-

-

-

-

7

6

7

6

Limit

0

0

-

-

-

-

-

-

-

-

-

-

1

3

1

3

SR11

Action

0

0

-

-

-

-

-

-

-

-

-

-

10

10

10

10

Limit

0

0

-

-

-

-

-

-

-

-

-

-

1

1

1

1

SR12

Action

0

0

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

0

4

0

0

0

0

0

0

0

0

0

0

-

-

0

4

SR13

Action

1

0

-

-

-

-

-

-

-

-

-

-

-

-

1

0

Limit

0

0

-

-

-

-

-

-

-

-

-

-

-

-

0

0

Total

Action

3

4

0

0

0

0

7

9

0

0

0

0

31

33

87

Limit

2

8

0

0

0

0

4

4

0

0

0

0

38

42

98

 

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

0

0

0

0

SR5

Action

0

0

-

0

Limit

0

0

-

0

SR9

Action

0

0

-

0

Limit

0

0

-

0

SR10

Action

0

0

-

0

Limit

0

0

-

0

SR11

Action

0

1

-

1

Limit

0

1

-

1

SR12

Action

0

0

0

0

Limit

5

0

0

5

SR13

Action

0

0

-

0

Limit

0

0

-

0

Total

Action

0

1

0

1

Limit

5

1

0

6

 

iii.    Waste Management

iv.     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 period.

 

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

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

 

vi.     Site Inspections and Audit

The Environmental Team conducted 12 site inspections in the reporting period. The Contractor is reminded to maintain good dredging practice to make sure the dredger was tightly closed during transportation of dredging process and cleaning of the water surface shall be done to remove the litter if it is found. 

 

The Contractor is also reminded that no foam shall be caused from construction activities within the site, mechanical fuel/ chemical should be stored inside the tray with appropriate labels. Also the Contractor was reminded to maintain the silt curtain at good condition, to prevent dripping from pipes and to close the dredger tightly during transportation.

 

According to Contractor, no archaeological deposit was found during reporting period.

 

vii.   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.

 

viii. Construction Activities for the Coming Reporting Period

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

·         Dredging at Portion A / Zone 1B, Zone 2C1, 2C2, 2C3 and 2C4 in EP

·         Dredging at Portion B / Zone 5B, 5C, Zone 6A, 6B, 6C, 6D Zone 7 and Zone 8 in EP

·         Dredging at Portion C / Zone 9 and Zone 11 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.