Job No.: TCS00975/18

 

 

 

 

 

 

 

 

 

CEDD Contract Agreement No. EDO/04/2018 -

Environmental Team for Cross Bay Link, Tseung Kwan O

 

 

 

 

 

 

 

 

 

Quarterly Environmental Monitoring and Audit (EM&A) Summary Report

(December 2018 to February 2019)

 

 

 

 

 

 

 

 

Prepared For

 

 

 

 

Civil Engineering and Development Department (CEDD)

 

 

 

 

 

 

 

 

 

 

 

Date

Reference No.

Prepared By

Certified By

2 July 2019

TCS00975/18/600/R0151v4

My signature

Martin Li

(Environmental Consultant)

Tam Tak Wing

(Environmental Team Leader)

 

Version

Date

Remarks

1

20 May 2019

First Submission

2

25 June 2019

Amended against IEC’s comments

3

2 July 2019

Amended against IEC’s comments

4

2 July 2019

Amended against IEC’s comments

 

 

 


 

 

 

 

 

executive summary

ES01            Civil Engineering and Development Department (hereafter referred as “CEDD”) is the Project Proponent and the Permit Holder of the Project Cross Bay Link, Tseung Kwan O (hereinafter referred as “the Project”) which is a Designated Project to be implemented under Environmental Permit number EP-459/2013 (hereinafter referred as “the EP-459/2013” or “the EP”).

 

ES02            AUES was awarded the CEDD Contract Agreement No. EDO/04/2018 - Environmental Team for Cross Bay Link, Tseung Kwan O (hereinafter called “the Service Contract”). The Services under the Service Contract is to provide environmental monitoring and audit (EM&A) services for the Works Contracts pursuant to the requirement of Environmental Team (ET) under the Approved EM&A Manual to ensure that the environmental performance of the Works Contracts comply with the requirement specified in the EM&A Manual and EIA Report of Agreement No. CE 43/2008 (HY) Cross Bay Link, Tseung Kwan O - Investigation and other relevant statutory requirements.

 

ES03            This is the 1st Quarterly EM&A report presenting the monitoring results and inspection findings for the reporting period from 3rd December 2018 to 28th February 2019 (hereinafter ‘the Reporting Period’).

 

Environmental Monitoring and Audit Activities

ES04            Environmental monitoring activities under the EM&A program in this Reporting Period are summarized in the following table.  

Table ES-4    Summary Environmental Monitoring Activities Undertaken in the Reporting Period

Issues

Environmental Monitoring Parameters / Inspection

Sessions

Air Quality

1-Hour TSP

48

24-Hr TSP

17

Construction Noise

Leq (30min) Daytime

13

Water Quality

Marine Water Sampling(Note 1)

37

Inspection / Audit

Contract 1

ET Regular Environmental Site Inspection

13

Contract 2

6

Note 1     Total sessions are counted by monitoring days

 

Breach of Action and Limit (A/L) Levels

ES05            No air quality and construction noise monitoring exceedance was recorded in this Reporting Period. For water quality monitoring, six (6) Action Level and four (4) Limit Level exceedances were recorded for Suspended Solids in the reporting period. NOEs were issued to notify EPD, AFCD, WSD, IEC, the Contractor and the Project Consultant. The statistics of environmental exceedance, NOE issued and investigation of exceedance are summarized in the following table.

Table ES-5    Summary Environmental Monitoring Parameter Exceedance in the Reporting Period

Environmental Issues

Monitoring Parameters

Action Level

Limit Level

Event & Action

NOE Issued

Investigation Results

Corrective Actions

Air Quality

1-Hour TSP

0

0

0

--

--

24-Hr TSP

0

0

0

--

--

Construction Noise

Leq30min Daytime

0

0

0

--

--

Water Quality (Marine Water)

DO

0

0

0

--

--

Turbidity

0

0

0

Not project related

NA

SS

6

4

10

Note:        NOE – Notification of Exceedance

 

ES06            For Suspended Solid exceedance recorded in the reporting period, investigations were conducted and it is concluded that the exceedances were unlikely caused by the Project.  Nevertheless, the Contractor was reminded to check the implementation of silt curtain regularly to ensure no seepage of muddy water into the marine water body.

 

Environmental Complaint

ES07            No environmental complaint was recorded in this Reporting Period for the Project.  The statistics of environmental complaint are summarized in the following table.

Table ES-6    Summary Environmental Complaint Records in the Reporting Period

Reporting Period

Contract

Environmental Complaint Statistics

Related with the Works Contract(s)

Frequency

Cumulative

Complaint Nature

3 December 2018 – 28 February 2019

1

0

0

NA

NA

2

0

0

NA

NA

 

Notification of Summons and Successful Prosecutions

ES08            No environmental summons or prosecutions was received in this Reporting Period for the Project.  The statistics of environmental summons or prosecutions are summarized in the following tables.

Table ES-7    Summary Environmental Summons Records in the Reporting Period

Reporting Period

Contract

Environmental Summons Statistics

Related with the Works Contract(s)

Frequency

Cumulative

Complaint Nature

3 December 2018 – 28 February 2019

1

0

0

NA

NA

2

0

0

NA

NA

Table ES-8    Summary Environmental Prosecutions Records in the Reporting Period

Reporting Period

Contract

Environmental Prosecution Statistics

Related with the Works Contract(s)

Frequency

Cumulative

Complaint Nature

3 December 2018 – 28 February 2019

1

0

0

NA

NA

2

0

0

NA

NA

 

Site Inspection by External Parties

ES09            No site inspection was undertaken by AFCD within the Reporting Period. EPD site inspection was undertaken on 28 February 2019 in relation to Contract 1 Contractor’s effluent discharge license application.


 

 

 

Table of Contents

1.    Introduction   3

1.1            Project Background   3

1.2            Report Structure  3

2.    Project Organization and Construction progress and Submission   4

2.1            Project Organization   4

2.2            Construction Progress  4

2.3            Summary of Environmental Submissions  4

3.    Summary of Environmental Monitoring Programmes and Requirements  5

3.1            General  5

3.2            Monitoring Parameters  5

3.3            Monitoring Locations  5

3.4            Monitoring Frequency and Period   6

3.5            Determination of Action/Limit (A/L) Levels  7

4.    Impact Monitoring Result   9

4.1            Results of Air Quality Monitoring in the Reporting Month   9

4.2            Results of Construction Noise Monitoring   9

4.3            Results of Water quality Monitoring   9

5.    Waste Management   11

5.1            General Waste Management  11

5.2            Records of Waste Quantities  11

6.    Site Inspection   12

6.1            Requirements  12

6.2            Findings / Deficiencies During the Reporting Month   12

7.    Landfill Gas Monitoring   13

7.1            General Requirement  13

7.2            Limit Levels and Event and Action Plan   13

7.3            Landfill Gas Monitoring   13

8.    Environmental Complaint and Non-Compliance   14

8.1            Environmental Complaint, Summons and Prosecution   14

9.    Implementation Status of Mitigation Measures  15

9.1            General Requirements  15

10.  Conclusions and Recommendations  16

10.1          Conclusions  16

10.2          Recommendations  16

 

 

 

 


List of TABLES

Table 3-1        Summary of EM&A Requirements

Table 3-2        Designated Air Quality Monitoring Location recommended in EM&A Manual

Table 3-3        Designated Construction Noise Monitoring Location recommended in EM&A Manual

Table 3-4        Interim alternative location for air quality and noise monitoring

Table 3-5        Location of Water Quality Monitoring Station

Table 3-6        Action and Limit Levels for Air Quality

Table 3-7        Action and Limit Levels for Construction Noise

Table 3-8        Action and Limit Levels for Water Quality

Table 4-1        Summary of Air Quality Impact Monitoring results

Table 4-2        Summary of Construction Noise Impact Monitoring results

Table 4-3        Result Summary of Depth Average (Surface & Middle Layer) of DO (mg/L)

Table 4-4        Result Summary of Bottom Depth of DO (mg/L)

Table 4-5        Result Summary of Depth Average of Turbidity (NTU)

Table 4-6        Result Summary of Depth Average of Suspended Solid (mg/L)

Table 4-7        Summary of Water Quality Exceedance

Table 5-1        Summary of Quantities of Inert C&D Materials

Table 5-2        Summary of Quantities of C&D Wastes

Table 6-1        Summary of Site Observations of Contract 1

Table 6-2        Summary of Site Observations of Contract 2

Table 7-1        Actions in the Event of Landfill Gas Being Detected in Excavations

Table 8-1        Statistical Summary of Environmental Complaints

Table 8-2        Statistical Summary of Environmental Summons

Table 8-3        Statistical Summary of Environmental Prosecution

Table 9-1        Environmental Mitigation Measures in the Reporting Period

 

List of Appendices

Appendix A    Project Layout Plan

Appendix B    Project Organization Chart & Contact Details of Key Personnel

Appendix C    3-Month Rolling Construction Program

Appendix D    Monitoring Location (Air Quality, Noise and Water Quality)

Appendix E    Graphical plots of Monitoring Results

Appendix F    Meteorological Information

Appendix G    Waste Flow Table

Appendix H    Implementation Schedule for Environmental Mitigation Measures (ISEMM)

 

 

 

 

 

 

 

1.                       Introduction

1.1                   Project Background

 

1.1.1             Civil Engineering and Development Department (hereafter referred as “CEDD”) is the Project Proponent and the Permit Holder of the Project Cross Bay Link, Tseung Kwan O (hereinafter referred as “the Project”) which is a Designated Project to be implemented under Environmental Permit number EP-459/2013 (hereinafter referred as “the EP-459/2013” or “the EP”).

 

1.1.2             AUES was awarded the CEDD Contract Agreement No. EDO/04/2018 - Environmental Team for Cross Bay Link, Tseung Kwan O (hereinafter called “the Service Contract”). The Services under the Service Contract is to provide environmental monitoring and audit (EM&A) services for the Works Contracts pursuant to the requirement of Environmental Team (ET) under the Approved EM&A Manual to ensure that the environmental performance of the Works Contracts comply with the requirement specified in the EM&A Manual and EIA Report of Agreement No. CE 43/2008 (HY) Cross Bay Link, Tseung Kwan O - Investigation and other relevant statutory requirements.

 

1.1.3             As part of the EM&A programme, baseline monitoring shall be undertaken before the Project construction work commencement to determine the ambient environmental condition. The baseline air quality, background noise and water quality monitoring has been carried out between 21st September 2018 and 13th November 2018 at the designated and interim locations.  The baseline monitoring report under the EP-459/2013 has been compiled by the ET and verified by Independent Environmental Checker (hereinafter the “IEC’) prior submitted to EPD on 19th November 2018 for endorsement.

 

1.1.4             This is the 1st Quarterly EM&A report presenting the monitoring results and inspection findings for the reporting period from 3rd December 2018 to 28th February 2019 (hereinafter ‘the Reporting Period’).

 

1.2                   Report Structure

1.2.1             The Environmental Monitoring and Audit (EM&A) Monthly Report is structured into the following sections:-

Section 1

Introduction

Section 2

Project Organization and Construction Progress

Section 3

Summary of Impact Monitoring Requirements

Section 4

Impact Monitoring Results

Section 5

Waste Management

Section 6

Site Inspections

Section 7

Landfill Gas Monitoring

Section 8

Environmental Complaints and Non-Compliance

Section 9

Implementation Status of Mitigation Measures

Section 10

Conclusions and Recommendations

 


2.                       Project Organization and Construction progress and Submission

2.1                   Project Organization

2.1.1             The project organization is shown in Appendix B.  The responsibilities of respective parties can be referred to Monthly Report.

 

2.2                   Construction Progress

2.2.1             3-month rolling construction program of each Works Contract is enclosed in Appendix C; and the major construction activities undertaken in the Reporting Period is presented in below sub-sections.

Contract 1 (Contract No. NE/2017/07)

2.2.2             The major construction activities of Contract 1 undertaken in this Reporting Period are:-

Ÿ  Site Clearance Work at Works Area A

Ÿ  Site Office Setup at Works Area A

Ÿ  Pre-drilling works at Portion II

Ÿ  Piling works at Portion II

Contract 2 (Contract No. NE/2017/08)

2.2.3             The major construction activities of Contract 2 undertaken in this Reporting Period are:-

Ÿ  Site Clearance Work at Portion III and VI

Ÿ  Initial Survey at Portion III and VI

Ÿ  UU Detection Work at Portion III and VI

Ÿ  Fencing Erection Work at Portion II and VI

Ÿ  Trial Pit and Pre-drill Work at Portion VI

 

2.3                   Summary of Environmental Submissions

2.3.1             All the documents required under Environmental Permit No. EP-459/2013 were submitted within the required timeframe. The details can be referred to the Monthly Report.

 

2.3.2             Upon completed baseline monitoring, a Baseline Monitoring Report was verified by IEC on 19 November 2018 and submitted to EPD on that day for endorsement.

 

2.3.3             The notification of Project dedicated web site to EPD was made on 9 January 2019 (http://www.envcbltko.hk/).

 

 


3.                       Summary of Environmental Monitoring Programmes and Requirements

3.1                   General

3.1.1             The Environmental Monitoring and Audit Programmes and requirements are set out in the Approved EM&A manual.  Environmental issues such as air quality, construction noise and water quality were identified as the key issues during the construction phase of the Project.  A summary of EM&A programmes and requirements are presented in the sub-sections below.

 

3.2                   Monitoring Parameters

3.2.1             Monitoring parameters of air quality, noise and water quality are summarized in Table 3-1.

Table 3-1      Summary of EM&A Requirements

Environmental Issue

Parameters

Air Quality

Ÿ  1-hour TSP by Real-Time Portable Dust Meter; and

Ÿ  24-hour TSP by High Volume Air Sampler

Noise

Ÿ  Leq (30min) in six consecutive Leq(5 min) between 07:00-19:00 on normal weekdays

Ÿ  Supplementary information for data auditing, statistical results such as L10 and L90 shall also be obtained for reference.

Water Quality

Ÿ  In-situ measurement – Dissolved Oxygen (DO) concentration (mg/L) & saturation (%), pH, Salinity (mg/L), Temperature (ºC) and Turbidity (NTU); and

Ÿ  Laboratory analysis – SS (mg/L)

 

3.3                   Monitoring Locations

Air Quality and Construction Noise

3.3.1             According to the Approved EM&A Manual Section 5.4 and Section 6.3, three (3) representative air sensitive receivers (ASR) and four (4) representative noise sensitive receivers were designated as monitoring stations.  The designated air quality and noise monitoring locations are listed in Table 3-2 and Table 3-3, and illustrated in Appendix D.

Table 3-2      Designated Air Quality Monitoring Location recommended in EM&A Manual

ID

Location in the EM&A Manual

Currently Situation

AM1

Tung Wah Group of Hospitals Aided Primary School & Secondary School

Not yet construct

AM2

Lohas Park Stage 2 (Planned Development in Area 86)

Under Construction

AM3

Lohas Park Stage 3 (Planned Development in Area 86)

Under Construction

 

Table 3-3      Designated Construction Noise Monitoring Location recommended by EM&A Manual

ID

Location

Currently Situation

CNMS-1

Lohas Park Stage 1(Planned Development in Area 86, Package 5) (Southeast facade)

Under Construction

CNMS-2

Lohas Park Stage 1 (Planned Development in Area 86, Package 6) (Southeast facade)

Under Construction

CNMS-3

Lohas Park Stage 3 (Planned Development in Area 86,Package 11) (West facade)

Under Construction

CNMS-4

Tung Wah Group of Hospitals Aided Primary School & Secondary School (Southwest facade)

Not yet construct

 

3.3.2             As observed and confirmed by ET and IEC during the joint site visit on 29th August 2018, the designated air quality and noise monitoring locations are under construction or yet to construct. It is considered that these designated locations are not appropriate to perform air quality and noise monitoring. In this regard, alternative locations were proposed as interim arrangement to carry out air quality and noise monitoring before occupation of the designated monitoring location. A letter enclosed with the alternative location proposal and IEC verification (Our Ref: TCS00975/18/300/L0038) was sent to EPD on 19th October 2018 and the proposal was agreed by EPD. Therefore, air quality and construction noise impact monitoring would be performed at the agreed alternative locations until the designated sensitive receivers occupied and granted the premises. 

 

3.3.3             The agreed alternative monitoring location for impact air quality and noise monitoring are summarized in Table 3-4 and illustrated in Appendix D.

 

Table 3-4      Interim alternative location for air quality and noise monitoring

Location ID

Monitoring Parameter

Location

AM4

1-Hour TSP Air Quality

Podium of Lohas Park Phase 2A (Le Prestige)

AM5

24-Hour TSP Air Quality

Boundary of Site Office near Junction of Wan Po Road and Wan O Road

CNMS-5

Noise (Leq, L10 & L90)

Podium of Lohas Park Phase 2A (Le Prestige)

               Remark: Since 24-Hour TSP Air Quality monitoring is not granted at AM4 Lohas Park Phase 2A, the 24-Hour TSP monitoring was therefore proposed at AM5 which is located at the boundary of the project site office.

 

Water Quality

3.3.4             According to Table 7.1 of the approved EM&A Manual Section 7.4, two Control Stations (C3 & C4), six (6) sensitive receivers (CC1, CC2, CC3, CC4, CC13 & SWI1) and one (1) Gradient station (I1) are recommended to perform water quality monitoring.  Details and coordinate of these water quality monitoring stations are described in Table 3-5 and the locations is shown in Appendix D.

Table 3-5      Location of Water Quality Monitoring Station

Station

Coordinates

Description

Easting

Northing

CC1

843201

816416

Sensitive Receiver – Coral Sites at Chiu Keng Wan

CC2

844076

817091

Sensitive Receiver – Coral Sites at Junk Bay

CC3

844606

817941

Sensitive Receiver – Coral Sites at Junk Island

CC4

845444

815595

Sensitive Receiver – Coral Sites at Fat Tong Chau West

CC13

844200

817495

Sensitive Receiver – Coral Sites at Junk Bay near Chiu Keng Wan

SWI1

845512

817442

Sensitive ReceiverTseung Kwan O Salt Water Intake

C3

843821

816211

Control Station (Ebb Tide) – within Junk Bay

C4

844621

815770

Control Station (Flood Tide) – within Junk Bay

I1

844602

817675

Gradient Station – in between Lam Tin Tunnel (LTT) and CBL

 

3.4                   Monitoring Frequency and Period

3.4.1             To according with the approved EM&A Manual, impact monitoring requirements are presented as follows.

 

Air Quality Monitoring

3.4.2             Air quality impact monitoring frequency is as follows:

Ÿ   Once every 6 days of 24-hour TSP and 3 times of 1-hour TSP monitoring; during course of works throughout the construction period

 

Construction Noise Monitoring

3.4.3             Construction noise monitoring frequency is as follows:

Ÿ   One set of Leq(30min) measurements in a weekly basis between 07:00 and 19:00 hours on normal weekdays during course of works as throughout the construction period

Ÿ   If construction works are extended to include works during the hours of 1900-0700, additional weekly impact monitoring shall be carried out during evening and night-time works. Applicable permits under the NCO shall be obtained by the Contractor.

 

 

Water Quality (Marine Water) Monitoring

3.4.4             Marine water impact monitoring frequency is as follows:

Ÿ   Three days a week, at mid ebb and mid flood tides during course of pile excavation works for the bridge pier foundations underway.  Moreover, the intervals between 2 consecutive sets of monitoring day shall not be less than 36 hours.

 

3.5                   Determination of Action/Limit (A/L) Levels

3.5.1             The baseline results form the basis for determining the environmental acceptance criteria for the impact monitoring.  A summary of the Action/Limit (A/L) Levels for air quality, construction noise and water quality are shown in Tables 3-6, 3-7 and 3-8 respectively.

Table 3-6      Action & Limit Levels of Air Quality (1-Hour & 24-Hr TSP)

Monitoring Station

Action Level (mg /m3)

Limit Level (mg/m3)

1-Hour TSP

24-Hr TSP

1-Hour TSP

24-Hr TSP

AM4

278

NA

500

NA

AM5

NA

190

NA

260

Note:     1-Hour & 24-Hr TSP of Action Level = (Average Baseline Results × 1.3 + Limit level)/2

 

Table 3-7      Action and Limit Levels for Construction Noise, dB(A)

Monitoring Location

Action Level

Limit Level

(Leq30min)

Time Period: 0700-1900 hours on normal weekdays

CNMS-5

When one or more documented complaints are received

75 dB(A)

Remarks:

1.           Construction noise monitoring will be resumed at the designated locations CNMS-1, CNMS-2, CNMS-3 and CNMS4 once they are available and permission are granted;

2.           The designated locations CNMS-1, CNMS-2 and CNMS-3 are located at residential building which are still under construction, Limit Level of 75dB(A) will be adopted until they are occupied;

3.           The designated location CNMS-4 is located at planned school and still not yet to construction.  When the school occupied and operated, Limit Level of 70dB(A) should be adopted and should be reduced to 65dB(A) during examination period; and

4.           If construction works are required during restricted hours, the conditions stipulated in the construction noise permit issued by the Noise Control Authority shall be followed.

 

Table 3-8      Action and Limit Levels for Water Quality

Monitoring Station

Depth Average of SS (mg/L)

Action Level

Limit Level

CC1

7.8

OR 120% of upstream control station at the same tide of the same day

(Control Station C3 at Ebb tide and Control Station C4 at Flood tide), whichever is higher

9.3

OR 130% of upstream control station at the same tide of the same day

(Control Station C3 at Ebb tide and Control Station C4 at Flood tide) , whichever is higher

CC2

9.0

9.2

CC3

8.2

9.0

CC4

13.8

15.4

CC13

8.9

10.3

SWI1

8 mg/L

10 mg/L

 



Monitoring Location

Dissolved Oxygen (mg/L)

Depth Average of Surface and Mid-depth

Bottom

Action Level

Limit Level

Action Level

Limit Level

CC1

5.8

5.7

5.3

5.2

CC2

5.8

5.7

5.3

5.1

CC3

5.5

5.4

4.9

4.7

CC4

5.7

5.7

5.5

5.4

CC13

5.6

5.5

5.3

5.2

SWI1

5.4

4.8

5.1

5.0

 

Monitoring Location

Depth Average of Turbidity (NTU)

Action Level

Limit Level

CC1

5.8

OR 120% of upstream control station at the same tide of the same day

(Control Station C3 at Ebb tide and Control Station C4 at Flood tide) , whichever is higher

6.0

OR 130% of upstream control station at the same tide of the same day

(Control Station C3 at Ebb tide and Control Station C4 at Flood tide) , whichever is higher

CC2

4.6

5.5

CC3

4.8

5.4

CC4

6.1

7.1

CC13

6.0

6.3

SWI1

6.1

7.1

 

3.5.2             Should non-compliance of the environmental quality criteria occurs, remedial actions will be triggered according to the Event and Action Plan as stated EM&A Manual.

 


 

4.                       Impact Monitoring Result

 

4.1                   Results of Air Quality Monitoring in the Reporting Month

4.1.1             During the Reporting Period, 48 sessions of 1-hour TSP and 17 sessions of 24-hours TSP monitoring were carried out and the monitoring results are summarized in Table 4-1.  The relevant graphical plots are shown in Appendix E.

Table 4-1      Summary of Air Quality Impact Monitoring Results

Monitoring Location

1-hour TSP (µg/m3)

24-hour TSP (µg/m3)

Min

Max

Average

Min

Max

Average

AMS-1

39

118

66

 

Record Date

10-Dec-18

18-Jan-19

48 events

AMS-5

 

52

180

131

Record Date

2-Feb-19

15-Jan-19

17 events

 

4.1.2             As shown in Table 4-1, all the 1-hour TSP and 24-hour TSP monitoring results were below the Action / Limit Levels.  No Notification of Exceedance (NOE) was issued in this Reporting Period.

 

4.1.3             Due to the reporting quarter is dry and windy season, dust monitoring result may be higher than in wet season. No adverse impact on the monitoring result was observed in reporting quarter. The summary of meteorological information for the Reporting Period is shown in Appendix F.

 

4.2                   Results of Construction Noise Monitoring

4.2.1             13 sessions of construction noise monitoring were performed at the interim alternative location in the reporting period.  The noise monitoring results at interim alternative location is summarized in Table 4-2.  The relevant graphical plots are shown in Appendix E.

Table 4-2      Summary of Construction Noise Impact Monitoring Results

Monitoring Location

Leq, 30min (dB((A))

Min

Max

Average

CNMS-5

58.0

69.3

65.2

Record Date

21-Dec-18

10-Dec-18

13 events

 

4.2.2             All the measured results were below 75dB(A) of the acceptance criteria.  Furthermore, no complaint on construction noise was registered, indicating no exceedance of Action Level.  No non-compliance was therefore found during the Reporting Period.

 

4.3                   Results of Water quality Monitoring

4.3.1             In this Reporting Period, a total of 37 sampling days were performed for marine water monitoring at the nine designated locations.  Monitoring results of 3 key parameters: dissolved oxygen (DO), turbidity and suspended solids are summarized in Tables 4-3 to 4-6 and the graphical plots are shown in Appendix E.

Table 4-3      Results Summary of Depth Average (Surface & Middle Layer) of DO (mg/L)

Tidal

CC1

CC2

CC3

CC4

CC13

SWI1

C3

C4

I1

Mid-Ebb

Average

7.6

7.6

7.6

7.5

7.5

7.5

7.5

7.5

7.5

Min

6.6

6.7

6.7

6.6

6.4

6.3

6.7

6.7

6.6

Max

9.2

9.4

9.6

9.1

9.4

9.7

9.1

9.0

9.7

Mid-Flood

Average

7.6

7.6

7.6

7.6

7.6

7.5

7.5

7.6

7.6

Min

6.6

6.6

6.6

6.6

6.5

6.1

6.6

6.7

6.6

Max

9.1

9.1

9.6

9.4

9.4

10.0

9.6

9.4

9.1

Table 4-4      Results Summary of Bottom Depth of DO (mg/L)

Tidal

CC1

CC2

CC3

CC4

CC13

SWI1

C3

C4

I1

Mid-Ebb

Average

7.5

7.4

7.3

NA

7.4

7.5

7.4

7.4

7.3

Min

6.5

6.6

6.4

NA

6.6

6.2

6.7

6.7

6.4

Max

9.3

8.7

8.4

NA

9.3

9.5

8.6

8.8

9.0

Mid-Flood

Average

7.5

7.4

7.3

NA

7.4

7.6

7.4

7.4

7.4

Min

6.5

6.6

6.4

NA

6.3

6.1

6.5

6.7

6.5

Max

9.4

8.6

9.0

NA

9.1

10.1

8.6

8.8

9.0

Remark: No Dissolved Oxygen (Bottom) monitoring data available for CC4 due to the water depth measured at CC4 during the monitoring days were less than 3 meters.

Table 4-5      Results Summary of Depth Average of Turbidity (NTU)

Tidal

CC1

CC2

CC3

CC4

CC13

SWI1

C3

C4

I1

Mid-Ebb

Average

1.4

1.5

1.6

1.5

1.6

1.4

1.6

1.6

1.7

Min

0.3

0.4

0.6

0.4

0.4

0.4

0.3

0.4

0.7

Max

2.9

3.0

3.3

2.7

3.1

3.0

2.9

3.2

3.4

Mid-Flood

Average

1.3

1.4

1.5

1.4

1.6

1.4

1.5

1.6

1.5

Min

0.5

0.4

0.6

0.4

0.4

0.4

0.4

0.6

0.6

Max

2.3

2.5

2.5

3.1

4.4

2.9

2.9

3.0

3.8

Table 4-6      Results Summary of Depth Average of Suspended Solids (mg/L)

Tidal

CC1

CC2

CC3

CC4

CC13

SWI1

C3

C4

I1

Mid-Ebb

Average

3.3

3.5

3.0