TABLE OF CONTENTS

 

EXECUTIVE SUMMARY                                                                                                           

1.           INTRODUCTION   Error! Bookmark not defined.

2.           BASIC PROJECT INFORMATION   Error! Bookmark not defined.

3.           EM&A REQUIREMENTS – ROUTINE IMPACT MONITORING   Error! Bookmark not defined.

4.           EM&A REQUIREMENTS – 24-HR WATER QUALITY MONITORING   Error! Bookmark not defined.

5.           ENVIRONMENTAL SITE INSPECTION AND AUDIT   Error! Bookmark not defined.

6.           COMPLAINTS, NOTIFICATION OF SUMMONS AND PROSECUTION   Error! Bookmark not defined.

7.           CONCLUSIONS   Error! Bookmark not defined.


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 Error! Bookmark not defined.

Table 2‑2     Detail Dredging Quantity  Error! Bookmark not defined.

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

Table 3‑2     Water Quality Monitoring Parameters  Error! Bookmark not defined.

Table 3‑3     Summary of Water Quality Exceedance (In-situ Measurement) Error! Bookmark not defined.

Table 3‑4     Summary of Water Quality Exceedance (Laboratory Analysis) Error! Bookmark not defined.

Table 4‑1     24-hr Water Quality Monitoring Parameters  Error! Bookmark not defined.

Table 4‑2     Summary of Water Quality Exceedance (24-hr Monitoring) Error! Bookmark not defined.

Table 5‑1     Waste Quantities of Dredging Works  Error! Bookmark not defined.

Table 5‑2     Comparison of Quarterly Mean to Baseline Mean  Error! Bookmark not defined.

Table 5‑3     Summary of Statistical Analysis  Error! Bookmark not defined.

Table 6‑1     Environmental Complaints Log  Error! Bookmark not defined.

Table 6‑2     Cumulative Statistics on Complaints  Error! Bookmark not defined.

Table 6‑3     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

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 Second Quarterly Environmental Monitoring Audit (EM&A) Report – August - October 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 July 2014 to 22 October 2014.

 

ii.      Construction Activities for the Reporting Period

During this reporting period, the principal work activities included:

 

August 2014

September 2014

October 2014

· Dredging at Portion D / Zone 13A in EP

· Dredging at Portion A / Zone 4A in EP

 

· Dredging at Portion D / Zone 13A in EP

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

· Dredging at Portion B / Zone 6B and Zone 6D in EP

 

· 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 and SR13 were conducted during the reporting period. Exceedances of DO, Turbidity, 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.

 

 

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.


 

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.      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.

 

vi.    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 period. However, the Contractor is 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. A training session was provided on 11th September for site staffs on maintaining good dredging practice.

 

The Contractor was also reminded to reduce noise emission from noise emitting parts by enclosing any mechanical equipment. Good housekeeping should be maintained in site area, including using drip tray for storage the mechanical fuel, mechanical fuel and paint solvent and keeping the drainage area clean.

 

The Contractor is reminded to use well maintained mechanical equipment to reduce black smoke emission from the chimney of vessels.

 

Chemical waste producer license application was in progress during the reporting period, chemical waste will be stored properly if produced.

 

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.

 

viii.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