Cover page

Verification letter
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.           NON-COMPLIANCE, 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 Period – 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 

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           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 Fourteenth Quarterly Environmental Monitoring Audit (EM&A) Report – August 2017 – October 2017 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 July 2017 to 22 October 2017.

 

ii.    Construction Activities for the Reporting Period

During this reporting period, the principal work activities included:

 

August 2017

September 2017

October 2017

·      Preparation Works of Dredging at Portion A / Zone 1A, Zone 2B1 and 2B2 in EP.

·      Dredging at Portion A / Zone 1A, Zone 2B1 and 2B2  in EP.

·     Preparation Works of Dredging at Portion A / Zone 2B1, 2B2 and 2C1 in EP.

·     Dredging at Portion A / Zone 2B1 and 2B2 in EP.

·    Preparation Works of Dredging at Portion A / Zone 1A, Zone 2B1, 2B2 and 2C1 in EP.

·    Dredging at Portion A / Zone 1A, Zone 2B1, 2B2 and 2C1 in EP.

Note: Hotspot area was completed excepted hard materials and buffer zone was almost completed except known highspot and hard materials

 

iii.   Water Quality Monitoring

Routine impact water quality monitoring at 9 designated monitoring stations namely C1A, C2A, G2, SR2, SR3, SR4, SR5, SR12, SR13 were conducted during the reporting period. Exceedances of DO (S&M), DO (B), Turbidity, TIN (in-situ & lab), NH3-N, (in-situ & lab), UIA (in-situ) and TSS 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

 

SR2

Action

0

0

0

0

1

1

0

0

0

0

-

-

1

1

 

Limit

1

1

1

1

0

0

0

0

0

0

-

-

2

2

 

SR3

Action

0

0

0

0

3

2

0

0

0

0

-

-

3

2

 

Limit

1

1

1

1

0

0

2

0

1

0

-

-

5

2

 

SR4

Action

0

0

0

0

0

0

0

0

0

0

-

-

0

0

 

Limit

0

0

0

0

3

2

0

0

0

0

-

-

3

2

 

SR5

Action

0

0

1

0

3

3

-

-

-

-

2

1

6

4

 

Limit

8

8

0

0

0

0

-

-

-

-

33

34

41

42

 

SR12

Action

0

0

0

0

0

0

0

0

0

0

-

-

0

0

 

Limit

0

0

0

0

2

1

0

0

0

0

-

-

2

1

 

SR13

Action

0

0

0

0

0

0

-

-

-

-

-

-

0

0

 

Limit

1

1

0

0

0

0

-

-

-

-

-

-

1

1

 

Total

Action

0

0

1

0

7

6

0

0

0

0

2

1

17

 

Limit

11

11

2

2

5

3

2

0

1

0

33

34

104

 

 


 

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

SR2

Action

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

Limit

0

0

-

-

-

-

0

0

0

0

-

-

-

-

0

0

SR3

Action

2

2

-

-

-

-

0

0

0

0

-

-

-

-

2

2

Limit

0

0

-

-

-

-

1

0

0

0

-

-

-

-

1

0

SR4

Action

0

0

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

2

3

0

0

0

0

0

0

0

0

0

0

-

-

2

3

SR5

Action

0

2

-

-

-

-

-

-

-

-

-

-

2

1

2

3

Limit

0

0

-

-

-

-

-

-

-

-

-

-

33

34

33

34

SR12

Action

0

0

0

0

0

0

0

0

0

0

0

0

-

-

0

0

Limit

6

5

0

0

0

0

0

0

0

0

0

0

-

-

6

5

SR13

Action

0

0

-

-

-

-

-

-

0

0

-

-

-

-

0

0

Limit

0

0

-

-

-

-

-

-

0

0

-

-

-

-

0

0

Total

Action

2

4

0

0

0

0

0

0

0

0

0

0

2

1

9

Limit

8

8

0

0

0

0

1

0

0

0

0

0

33

34

84

 

Among the 9 monitoring stations, supplementary 24-hr water quality monitoring was also conducted at 4 of the stations, which are SR4, SR5, SR12 and SR13. No exceedance was recorded in the reporting period. Number of exceedances recorded in the reporting period at each impact station is summarized in Table III.

 

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

SR12

Action

0

0

0

0

Limit

0

0

0

0

SR13

Action

0

0

-

0

Limit

0

0

-

0

Total

Action

0

0

0

0

Limit

0

0

0

0

 

iv.   Waste Management

There was marine sediment Type 1 sediment (Open Sea Disposal) disposed to South Cheung Chau Open Sea Sediment Disposal Area and East of Sha Chau Contaminated Mud Pit, Type 2 sediment (Confined Marine Disposal) disposed to East of Sha Chau Contaminated Mud Pit 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 13 site inspections in the reporting period. No particular observation was recorded in the reporting period except contractor was reminded to provide proper label on oil drum and the grab of dredge 161 should drip off the seawater within the silt curtain before transferring into the barge and grab should be enclosed after transferring back to soil curtain.

 

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 included:

·         Preparation Works of Dredging at Portion A / Zone 1A,  2B1, 2B2 and 2C1 in EP

·         Dredging at Portion A / Zone 1A, 2B1, 2B2 and 2C1 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.

·         After the completion of the construction works, post-construction water quality monitoring shall be carried out in accordance with the EM&A Manual Section 2.1.7. Water quality monitoring locations for the post-construction are SR1, SR2, SR3, SR4, SR5, SR6, SR7, SR8, SR9, SR10, SR11, SR12, SR13, G1, G2, G3, G4, G5, G6, C1, C2 and C3.

·         The impact monitoring schedule and the commencement of the post-construction water quality monitoring programme will be subjected to change due to the completion of construction works.