EXECUTIVE SUMMARY

Introduction

1.      This is the 11th Environmental Monitoring and Audit (EM&A) Report prepared by Cinotech Consultants Limited for the “Agreement No. CE 59/2015 (EP) Environmental Team for Tseung Kwan O – Lam Tin Tunnel – Design and Construction” (hereinafter called “the Project”).  This report documents the findings of EM&A Works conducted in September 2017.

 

2.      During the reporting month, the following works contracts were undertaken:

·     Contract No. NE/2015/01 – Tseung Kwan O – Lam Tin Tunnel – Main Tunnel and Associated Works;

·     Contract No. NE/2015/02 – Tseung Kwan O – Lam Tin Tunnel – Road P2 and Associated Works;

·   Contract No. NE/2015/03 – Tseung Kwan O – Lam Tin Tunnel – Northern Footbridge.

Environmental Monitoring Works

3.      Environmental monitoring for the Project was performed in accordance with the EM&A Manual and the monitoring results were checked and reviewed.  Site Inspections/Audits were conducted once per week. The implementation of the environmental mitigation measures, Event Action Plans and environmental complaint handling procedures were also checked.

 

4.      Summary of the non-compliance (exceedance) in the reporting month for the Project is tabulated in Table I.

 

Table I  Non-compliance (exceedance) Record for the Project in the Reporting Month

Environmental Monitoring

No. of Non-compliance (Exceedance)

No. of Non-compliance (Exceedance)

due to Construction Activities of this Project

Action Taken

Action Level

Limit Level

Action Level

Limit Level

Air Quality

0

0

0

0

N/A

Noise

11

0

11

0

Refer to the Appendix O

Groundwater Quality

1

7

0

0

N/A (Refer to Part 8, Executive Summary)

Marine Water Quality

0

0

0

0

N/A

Groundwater Level Monitoring (Piezometer Monitoring)

N/A

N/A

N/A

N/A

N/A

Ecological

N/A

N/A

N/A

N/A

N/A

Cultural Heritage

0

0

0

0

N/A

Landfill Gas

0

0

0

0

N/A

 

Air Quality Monitoring

5.      All 1-hour TSP monitoring was conducted as scheduled in the reporting month. No Action/Limit Level exceedance was recorded.

 

6.      All 24-hour TSP monitoring was conducted as scheduled in the reporting month. No Action/Limit Level exceedance was recorded.

 

Construction Noise Monitoring

 

7.      All noise monitoring was conducted as scheduled in the reporting month. Eleven Action Level exceedance was recorded due to the documented complaints received in the reporting month. No Limit Level exceedance was recorded.

 

Water Quality Monitoring

 

8.      Groundwater monitoring was conducted as scheduled in the reporting month. Action and Limit Level exceedance are considered to be non-Project related.

 

9.      All marine water monitoring was conducted as scheduled in the reporting month. No Action/Limit Level exceedance was recorded.

 

10.  Construction phase daily piezometer monitoring was not carried out in this reporting period as there is no tunnel construction activities are carried out within +/- 50m of the piezometer gate in plan.

 

Ecological Monitoring

 

11.  Post-translation coral monitoring survey shall be conducted once every 3 months for a period of 12 months after completion of coral translocation. The 4th post-translocation coral monitoring survey is scheduled in November 2017.

 

Monitoring on Cultural Heritage

 

12.  Monitoring of impacts on Cultural Heritage at Cha Kwo Ling Tin Hau Temple commenced in April 2017. No Alert Alarm and Action (AAA) Level exceedance was recorded in the reporting month.

 

Landscape and Visual Monitoring and Audit

 

13.  The implementation of landscape and visual mitigation measures was checked during the environmental site inspections. Recommended follow-up actions have been discharged by the Contractor.  Details of the audit findings and implementation status are presented in Section 10.

 

Landfill Gas Monitoring

14.  Monitoring of landfill gases commenced in December 2016 and were carried out by the Contractor at excavation location, Portion III. No Limit Level exceedance was recorded.

 

Environmental Site Inspection

 

15.  Joint weekly site inspections were conducted by representatives of the Contractor, Engineer and Environmental Team. The representative of the IEC joined the site inspection for NE/2015/01, NE/2015/02 and NE/2015/03 on 27, 27, 11 September 2017 respectively. Details of the audit findings and implementation status are presented in Section 10.

 

Waste Management 

 

16.  Wastes generated from this Project include inert construction and demolition (C&D) materials, non-inert C&D materials and marine sediments.  Details of waste management data is presented in Section 11 and Appendix P.

Key Information in the Reporting Month

17.  Summary of key information in the reporting month is tabulated in Table II.

 

Table II    Summary Table for Key Information in the Reporting Month

Event

Event Details

Action Taken

Status

Remark

Number

Nature

Complaint received by Project Team / Complaint referred by EPD (September 2017)

15

Construction dust / noise nuisance / Landscape and Visual Impacts

Under investigation

On-going

Details refer to App O

Complaint received by Project Team / Complaint referred by EPD (August 2017)

8

Muddy water discharge / Landscape and Visual Impacts

Investigation completed

On-going

Complaint received by Project Team  / Complaint referred by EPD (July 2017)

3

Construction dust and noise nuisance

Investigation completed

Closed

Reporting Changes

0

---

N/A

N/A

---

Notifications of any summons & prosecutions received

0

---

N/A

N/A

---

Key Construction Activities in the Reporting Month

18.  Summary of key construction activities in the reporting month is tabulated in Table III.

Table III      Summary Table for Major Site Activities in the Reporting Month

Contract No.

Project Title

Site Activities (September 2017)

NE/2015/01

Tseung Kwan O – Lam Tin Tunnel – Main Tunnel and Associated Works

Lam Tin Interchange

1)    Haul Road Construction

2)    EHC2 U-Trough

3)    Site Formation – Area 1G1, Area 1G2, 2 ,3, 4 & Area 5

4)    Pipe Pile wall – Area 2A

Main Tunnel

1)    Construction of Tunnel Adit

TKO Interchange

1)    Haul Road Construction, Site Formation and Slope Works

2)    Temporary Barging Facilities & Temporary Platform

3)    Temporary Cut Slope For BMCPC

4)    Steel Platform for Bridge Construction

NE/2015/02

Tseung Kwan O – Lam Tin Tunnel – Road P2 and Associated Works

1)      Site Clearance - Removal of vegetation and general refuse in Portion V and VI

2)      Hoarding Erection

3)      Advance Works for Construction of Steel Cofferdam in Portion VIII and Area B

4)      Reinstatement of Temporary Steel Cofferdam and Double Water Gate

5)      Construction of Retaining Wall (Portion VIII)

6)      Re-provisional of DSD transformation room (Portion I)

7)      Piling works at Tong Yin Street (Portion VI)

8)      Pre-bored works at Portion IV & VII

NE/2015/03

Tseung Kwan O – Lam Tin Tunnel – Northern Footbridge

1)      Foundation Pile

2)      Retaining Wall formwork, bar fixing concreting

3)      Pre-bored H-pile

Future Key Issues

19.  The future key environmental issues in the coming month include:

 

Table IV    Summary Table for Site Activities in the next Reporting Period

Contract No. and Project Title

Site Activities (October 2017)

Key environmental issues *

NE/2015/01 - Tseung Kwan O - Lam Tin Tunnel - Main Tunnel and Associated Works

Lam Tin Interchange

1)    EHC2 U-Trough

2)    Site Formation – Area 1G1, Area 1G2, Area 2, Area 3, Area 4 & Area 5

3)    Pipe Pile Wall – Area 2A

(A) / (B) / (C) / (D) / (E)

Main Tunnel

1)    MT Excavation

(B)

TKO Interchange

1)    Haul Road Construction and Site Formation & Slope Works

2)    Temporary Cut Slope For BMCPC

3)    Temporary Barging Facilities & Temporary Platform

4)    Steel Platform for Bridge Construction

(A) / (C) / (D) / (E) / (F) / (I)

NE/2015/02 - Tseung Kwan O – Lam Tin Tunnel – Road P2 and Associated Works

1)      E&M final fixing and energization, FS inspection, Permanent power changeover for DSD transformer room at Portion I

2)      Handover Transformer Room to DSD

3)      Construction of 2100mm dia. Pipe at Portion IV

4)      Site Monitoring System Set-up works

5)      Reinstatement of Marine Cofferdam and Double Water Gate

6)      Construction of outfall 1 for diversion of existing drainpipe at Portion IV

7)      Construction of sloping seawall

8)      Construction of Treatment facilities for Type I marine sediment at Area A

9)      Construction of prebored socket H-piles and loading tests at Portion V and VI

10)  Construction of Retaining Wall at Portion VIII

11)  Excavation and Structural works for temporary steel cofferdam at Portion VIII

12)  ELS works for Area B

13)  Pre-bore and sheet pile installation works at Portion VIII

(A) / (B) / (C) / (D) / (E) / (F) / (G) / (H) / (I)

NE/2015/03 - Tseung Kwan O – Lam Tin Tunnel – Northern Footbridge

1)      Foundation Pile

2)      Retaining Wall formwork, bar fixing concreting

(A) / (C) / (D)

 

Note:

(A)     Watering for dust generation from haul road, stockpiles of dusty materials, exposed site area, excavation works and rock breaking activities;

(B)      Noisy construction activity such as rock-breaking activities and piling works;

(C)      Runoff from exposed slope or site area;

(D)     Wastewater and runoff discharge from site;

(E)      Accumulation of silt, mud and sand along U-channels and sedimentation tanks;

(F)       Set up and implementation of temporary drainage system for the surface runoff;

(G)     Storage of chemicals/fuel and chemical waste/waste oil on site;

(H)     Accumulation and storage of general and construction waste on site; and

(I)        Marine water quality impact and indirect impact to coral communities due to marine construction for TKO-LTT reclamation.