Lamma Power Station Extension

Baseline Monitoring Report

 

April 2001


TABLE OF CONTENTS

 

 

Executive Summary

1.         Introduction   1

1.1       Purpose of the Report 1

1.2       Background  1

1.3       Structure of the Baseline Monitoring Report 1

2.         AIR QUALITY   3

2.1       Monitoring Requirements  3

2.2       Monitoring Locations  3

2.3       Monitoring Parameters, Frequency and Duration  3

2.4       Monitoring Equipment 4

2.5       Monitoring Methodology  4

2.6       Results And Observations  5

2.7       Action and Limit Levels  6

3.         NOISE   8

3.1       Monitoring Requirements  8

3.2       Monitoring Locations  8

3.3       Monitoring Parameters, Frequency and Duration  8

3.4       Monitoring Equipment 9

3.5       Monitoring Procedures  9

3.6       Results & Observations  9

3.7       Monitoring Frequency, Action and Limit Levels  10

4.         Water Quality   13

4.1       Action and Limit Levels  13

5.         Marine Ecological Survey   15

6.         Conclusion   16

 


LIST OF TABLES

 

Table 2.1                   Air Quality Monitoring Location

Table 2.2                   Baseline Dust Monitoring Parameter and Frequency

Table 2.3                   Monitoring Schedules for the Monitoring Stations

Table 2.4                   Air Quality Monitoring Equipment

Table 2.5                   Summary of Baseline Air Quality Monitoring Results

Table 2.6                   Action and Limit Levels for Air Quality

Table 2.7                   Action and Limit Levels for 1-Hour and 24-Hour TSP

Table 3.1                   Noise Monitoring Location

Table 3.2                   Baseline Noise Monitoring Parameter and Frequency

Table 3.3                   Noise Monitoring Equipment

Table 3.4                   Summary of Baseline Noise Monitoring Results at Ash Lagoon and Pak Kok Tsui

Table 3.5                   Summary of Monthly Noise Monitoring Results at the Existing Ching Lam Noise Monitoring Station

Table 3.6                   Monitoring Frequency and Action & Limit Levels of Construction Noise (Other than Percussive Piling)

Table 4.1                   Action and Limit Levels for Water Quality

 

LIST OF FIGURES

 

Figure 1.1        Construction Site of Lamma Power Station Extension

Figure 1.2        Construction of a New Transmission System Linking the Lamma Power Station Extension to Hong Kong Island

Figure 1.3        Laying of a Gas Pipeline for the Supply of Natural Gas to the Lamma Power Station Extension

Figure 2.1        Locations of Air Quality Monitoring Station

Figure 3.1        Locations of Noise Monitoring Stations - Ash Lagoon and Ching Lam

Figure 3.2        Location of Noise Monitoring at Pak Kok Tusi

 

LIST OF ANNEXES

 

Annex A                     Baseline Air Quality Monitoring Data

Annex B                     Graphical Presentation of 1-hour and 24-hour TSP Results 

Annex C                     Baseline Noise Monitoring Data at Ash Lagoon

Annex D                     Baseline Noise Monitoring Data at Pak Kok Tsui

Annex E                      Baseline Noise Monitoring Data at Ching Lam

Annex F                      Graphical Presentation of Baseline Noise Monitoring Data at Ash Lagoon

Annex G                     Graphical Presentation of Baseline Noise Monitoring Data at Pak Kok Tsui

Annex H                     Graphical Presentation of Baseline Noise Monitoring Data at Ching Lam

Annex I                        Weather Condition During Baseline Noise Monitoring at Ash Lagoon and Pak Kok Tsui

Annex J                       Baseline Marine Water Quality Monitoring Report prepared by a Water Quality Monitoring Consultant

Annex K                    Baseline Marine Ecological Monitoring Report prepared by an Ecological Survey Consultant

Annex L                      Additional Information of Baseline Marine Ecological Monitoring Report prepared by an Ecological Survey Consultant

 


Executive Summary

 

This is an environmental baseline monitoring report for the Project “Construction of Lamma Power Station Extension” prepared by the Environmental Team (ET).  This report contains the results of the baseline air quality, noise, marine water quality and marine ecological survey that were mainly performed in 2000.

 

The baseline 24-hour Total Suspended Particulate (TSP) monitoring was conducted at the existing three dust monitoring stations (viz. Reservoir, East Gate and Tai Yuen Village) from January to March 2000.   The baseline 1-hour TSP monitoring was carried out for 14 days in March 2000 at the existing two dust monitoring stations (viz. Reservoir and East Gate) when the highest dust impact was expected. 

 

Baseline noise monitoring of six consecutive Leq (5 min) was carried out at the Ash Lagoon for the construction of Lamma Extension during 1-11 November 2000 while that for the construction of the Transmission System was carried out at Pak Kok Tsui during 24-30 November 2000.   The monthly 30-minute Leq's measured at the existing Ching Lam noise monitoring station in the past 12 months (viz. from December 1999 to November 2000) were regarded as the baseline noise levels for the construction of Lamma Extension.

 

The baseline water quality monitoring was conducted between 6 November and 1 December 2000.  There were seven sensitive receivers chosen on the basis of their proximity to the dredging and filling operations and five control stations to monitor the ambient marine water quality in relation to other activities with potential water quality impacts from other concurrent construction projects.  Monitoring was carried out three times per week for four weeks.  Readings were taken at each location during both the mid-flood and mid-ebb tides.

 

Baseline TSP and water quality data were collected to derive the Action/Limit Levels for air and marine water quality during the impact/compliance monitoring throughout the construction of the Project.  The baseline noise monitoring results at Ash Lagoon/Pak Kok Tsui and Ching Lam would be used for applying background correction to the noise levels at the corresponding monitoring locations

 

Baseline marine ecological monitoring was conducted during 21-23 November 2000 to establish the status of scleractinian and soft coral assemblages prior to the commencement of the reclamation work.  The objective of the survey is to provide reference data for future post-construction survey to ascertain the extent of recolonisation of soft corals.

 

No major activities influencing air quality, noise, marine water quality and marine ecological survey were identified during the baseline monitoring.

 

 


1.                  Introduction

 

Baseline air quality, noise level , water quality and ecology monitoring was conducted in accordance with the Environmental Monitoring and Audit (EM&A) Manual (Construction Phase) for the Lamma Power Station Extension Project.

1.1              Purpose of the Report

 

The purpose of this report is to establish baseline levels for air quality, noise and water quality.  These levels will be used as the basis for assessing environmental impact and compliance monitoring during construction of the Project. This report presents the methodologies and results of the air quality, noise and water quality measurements as well as marine ecology survey.

1.2              Background

 

The Environmental Impact Assessment (EIA) Report for the Project, which was prepared in response to EIA Study Brief No. ESB-001/1998 issued to Hongkong Electric Company Limited (HEC) by the Environmental Protection Department (EPD), was completed in February 1999.  The EIA Report was submitted to the Director of Environmental Protection (DEP) in accordance with the requirements of the Environmental Impact Assessment Ordinance (EIAO) and was approved by DEP on 5 May 1999.

 

The Project involves the construction of a gas-fired power station employing combined cycled gas turbine technology, forming an extension to the existing Lamma Power Station.  The following outlines the key elements of the Project including the construction activities associated with the transmission system and submarine gas pipeline.

 

           dredging and reclamation to form approximately 22 hectares of usable area (Figure 1.1);

 

           construction of six 300MW gas-fired combined cycle units;

 

           construction of a gas receiving station;

 

           construction of a new transmission system linking the Lamma Extension to load centres on Hong Kong Island (Figure 1.2);

 

The laying of a gas pipeline for the supply of natural gas to the new power station (Figure 1.3)

 

According to the EM&A Manual, no baseline water quality monitoring is required for the construction activities of a gas pipeline.

1.3              Structure of the Baseline Monitoring Report

 

The structure of the report is as follows:

 

Section 1:     Introduction - detailing the purpose and structure of the report.

 

Section 2:     Air Quality - presenting the results of baseline air quality monitoring.

 

Section 3:     Noise - presenting the results of baseline noise monitoring.

 

Section 4:     Water Quality - presenting the results of baseline water quality monitoring prepared by a water-quality monitoring consultant.

 

Section 5:     Marine Ecological Survey - presenting the results of baseline marine ecological monitoring prepared by an ecological survey consultant.

 

Section 6:     Conclusion

 


 


 


 


2.                  AIR QUALITY

 

2.1              Monitoring Requirements

 

As stated in the EM&A Manual, the baseline air quality monitoring has been conducted in the first quarter of 2000 to determine the action levels for 1-hour TSP and 24-hour TSP.   24-hour TSP values were collected at the existing three dust monitoring stations from January to March 2000.  Sampling of 1-hour TSP was also carried out for 14 days in March 2000 at the existing two dust monitoring stations when the highest dust impact was expected.

2.2              Monitoring Locations

 

The three dust monitoring locations were selected for 24-hour TSP sampling (AM1, AM2 & AM4) whereas two monitoring locations were selected for 1-hour TSP sampling (AM1, AM2).  AM3 is an additional air monitoring station for 24-hour and 1-hour TSP which will be installed at the Ash Lagoon Decantrate Tower for impact monitoring.  This station has not been set up in the first quarter of 2000 for baseline monitoring.

 

Table 2.1 tabulates the three dust monitoring stations for baseline monitoring.  The locations of the monitoring stations are shown in Figure 2.1.

 

Table 2.1          Air Quality Monitoring Location

 

Location I.D.

Description

AM1

Reservoir

AM2

East Gate

AM4

Tai Yuen Village

 

2.3              Monitoring Parameters, Frequency and Duration

 

Table 2.2 summarises the monitoring parameters, monitoring period and frequencies of baseline air quality monitoring.  The monitoring schedules for each station is summarised in Table 2.3.

 


Table 2.2          Baseline Air Quality Monitoring Parameter and Frequency

 

Monitoring Stations

Parameter

Period

Frequency

AM1

1-hour TSP

1500-1800

3 times/day

24-hour TSP

0000-2400

Once every 6 days

AM2

1-hour TSP

1500-1800

3 times/day

24-hour TSP

0000-2400

Once every 6 days

AM4

24-hour TSP

0000-2400

Once every 6 days

 

 

Table 2.3          Monitoring Schedules for the Monitoring Stations

 

Location

Monitoring Schedule

1-hour TSP

24-hour TSP

AM1

18/03/00 - 31/03/00

04/01/00 - 28/03/00

AM2

18/03/00 - 31/03/00

04/01/00 - 28/03/00

AM4

-

04/01/00 - 28/03/00

 

2.4              Monitoring Equipment

 

Continuous 24-hour TSP air quality monitoring was performed using the GS2310 High Volume Air Sampler (HVAS) and the MINIVOL Portable Sampler at AM1/2 and AM4 respectively.  A TEOM Model 1400a continuous dust monitor was used to carry out the 1-hour TSP monitoring at AM1 and AM2.  Table 2.4 summarises the equipment used in the baseline dust monitoring programme.

 

Table 2.4          Air Quality Monitoring Equipment

 

Equipment

Model and Make

24 hour sampling:

HVAS Sampler

 

 

MINIVOL Portable Sampler

 

1 hour sampling:

Continuous TSP Dust Meter

 

Model GS2310

Anderson Instruments Inc.

 

AIRMETRICS

 

 

TEOM Model 1400a

Rupprecht & Patashnick

 

2.5              Monitoring Methodology

 

Instrumentation

 

High Volume Air Sampler model GS2310105-1, by Anderson Instruments Inc. was used for 24-hour TSP sampling at AM1 & AM2 (EPA Test Method Section 2.2 Reference Method for the Determination of Suspended Particulates in the Atmosphere)

 

-      20-60 SCFM adjustable flow range

-      Elapsed-time meter for 24 hours operation

-      Equipped with a flow recorder for continuous monitoring

-      Mass flow controller for 24 hours sampling period

 

MINIVOL Portable Sampler by AIRMETRICS was also used for 24-hour TSP sampling at AM4.

 

-            Programmable Timer

-            Elapsed Time Accumulator

-            Flow Controller controlling the operation flow rate at 5 liters/minute

 

TEOM model 1400a Continuous Dust Monitor, by Rupprecht & Patashnick was used to provide the 1 hour TSP data.

 

-            Real time TSP concentration

-            5-minute; hourly; 8-hours and 24-hours TSP average can be provided

-            Mass flow controller for precise flow control

 

Operating/Analytical Procedures

 

Air quality monitoring was conducted in accordance with the methodology specified in the EM&A Manual.  Detailed operating/analytical procedures can be referred to the EM&A Manual.

 

2.6              Results And Observations

 

Results

 

Baseline air quality monitoring was conducted at the three dust monitoring stations AM1, AM2 and AM4.  The result are summarised in Table 2.5.  The detailed monitoring data of 1-hour and 24-hour TSP is presented in Annex A.  Graphical presentations of the 1-hour TSP and 24-hour TSP results are shown in Annex B.

 


Table 2.5          Summary of the Baseline Air Quality Monitoring Results

 

 

AM1

Average TSP Concentration, mg/m3

(Range)

AM2

Average TSP Concentration, mg/m3

(Range)

AM4

Average TSP Concentration, mg/m3

(Range)

1-hour TSP

117

(31 – 262)

130

(45 – 297)

-

24-hour TSP

85

(11 – 195)

89

(15 – 191)

80

(11 – 171)

 

Observations

 

No major activities influencing air quality were identified during the baseline monitoring. 

 

2.7              Action and Limit Levels

 

The Action and Limit levels were set in accordance with the conditions stipulated in the Environmental Monitoring and Audit Manual which is summarised as follows:

 

Table 2.6          Action and Limit Levels for Air Quality

 

Parameters

Action

Limit

1-hour TSP Level in mg/m3

                    For baseline level [384 mg/m3, Action level = (130% x baseline + the Limit level)/2

                    For baseline level >384 mg/m3, Action level = Limit Level

500

24-hour TSP Level in mg/m3

                    For baseline level [200 mg/m3, Action level = (130% x baseline + the Limit level)/2

                    For baseline level >200 mg/m3, Action level = Limit Level

260

 

Data collected at AM2 was used to determine the Action levels as these data represents the highest dust impact during the sampling period.

 

Following the above criteria, the Action and Limit levels for air quality are set for AM1 to AM4 as follows:

 


Table 2.7          Action and Limit Levels for 1-hour and 24-hour TSP

 

 

Action Level, mg/m3

Limit Level, mg/m3

1-hour TSP*

340

500

24-hour TSP

190

260

 

*          No Action/Limit Level for 1-hour TSP is applied to AM4 where no real time dust monitor is installed.

 

 


 


3.                  NOISE

3.1              Monitoring Requirements

 

According to the requirements in the Construction EM&A Manual for Lamma Extension, the baseline levels at the monitoring locations have to be determined prior to the commencement of the construction of Lamma Power Station Extension and Transmission System.  Locations of baseline noise monitoring at Ash Lagoon & Ching Lam and Pak Kok Tsui are shown in Figures 3.1 and 3.2 respectively.

 

Baseline noise monitoring of six consecutive Leq (5 min) was carried out for 7 days at Ash Lagoon for the construction of Lamma Extension during 1-7 November 2000.  The noise data during 1 and 7 November 2000 for the evening time period 19:00-23:00 were discarded due to windy conditions.  Hence, the noise monitoring was extended to 11 November 2000.

 

The baseline monitoring for the construction of the Transmission System was carried out at Pak Kok Tsui during 24-30 November 2000. 

 

The monthly 30-minute Leq's measured at the existing Ching Lam noise monitoring station in the past 12 months (viz. from December 1999 to November 2000) were regarded as the baseline noise levels for the construction of Lamma Extension. 

 

The baseline noise level will be used for applying correction to the impact noise monitoring data for the most critical NSR’s.  For the construction of Lamma Power Station Extension, the two critical NSR’s are the Long Tsai Tsuen/Hung Shing Ye and the school within the village of Tai Wan San Tsuen.   For the construction of the Transmission System, the NSR’s is Pak Kok Tsui residence.

 

3.2              Monitoring Locations

 

In accordance with the EM&A manual, the three identified noise baseline monitoring locations are listed in table 3.1 as follows:

 

Table 3.1          Noise Monitoring Location

 

Purpose of the noise monitoring

Monitoring Location

Lamma Extension

Roof top of Ash Lagoon decantrate pump house

Lamma Extension

Existing Ching Lam noise monitoring station

Transmission System

Pak Kok Tsui

 

3.3              Monitoring Parameters, Frequency and Duration

 

The A-weighted Leq levels were recorded at 5-minute intervals at Ash Lagoon and Pak Kok Tsui while A-weighted Leq levels of 30-minute intervals were recorded in the existing noise monitoring station at Ching Lam.

 

The frequencies and parameters of baseline noise monitoring were presented in table 3.2 as follows:

 

Table 3.2          Baseline Noise Monitoring Parameter and Frequency

 

a.         Ash Lagoon and Pak Kok Tsui

 

Time Period

Duration

Parameter

Daytime:

0700-1900 hrs on normal weekdays

Six consecutive Leq (5min)

 

Leq

 

Evening-time:

0700-2300 hrs on holidays; and 1900-2300 hrs on all other days

Night-time:

2300-0700 hrs of the next day

 

b.         Ching Lam

 

Time Period

Duration

Parameter

Daytime: 0700-1900 hrs

Continuous  Leq (30min)

 

Leq

 

Evening-time: 1900-2300 hrs

Night-time: 2300-0700 hrs of the next day

 

Noise measurements have been made in accordance with standard acoustical principles and practices in relation to weather conditions.  A wind speed sensor has been installed at Station Building Rooftop of Lamma Power Station.  The wind speed signal recorded by computer was used to determine whether the data from Ash Lagoon were affected.  The noise data were discarded when the hourly average wind speed exceeded 5 m/s.

 

The wind speed at Pak Kok Tsui throughout the period of baseline monitoring was measured.  The noise data were discarded when the wind speed exceeded 5 m/s.   

 

For the existing noise monitoring station at Ching Lam, the computer has been programmed to automatically discard the noise data in case the instantaneous wind speed measured at the Station Building Rooftop exceeded 10 m/s.

 

 

3.4              Monitoring Equipment

 

The sound level meters used for baseline noise monitoring comply with International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1).  The noise monitoring equipment used is shown in Table 3.3.

 

Table 3.3          Noise Monitoring Equipment

 

Equipment

Model

Sound level meter

Onosokki LA-5110 (at Ash Lagoon and Pak Kok Tsui)

Cirrus CR:271 (at the existing Ching Lam noise monitoring station)

Calibrator

(IEC 942 Class 1)

Cirrus CRL512/Norsonic 1251

 

3.5              Monitoring Procedures

Noise monitoring was conducted in accordance with the methodology specified in the EM&A Manual.  Detailed procedures can be referred to the EM&A Manual.

3.6              Results & Observations

 

Results

 

Baseline noise monitoring was conducted.  The baseline noise monitoring data at Ash Lagoon & Pak Kok Tsui and Ching Lam are detailed in Annexes C, D & E respectively.  The graphical presentations of monitoring data measured at the three monitoring locations are also shown in Annexes F, G and H respectively.  Weather conditions at the monitoring locations during the baseline monitoring period are presented in Annex I.

 

The baseline noise monitoring results are summarized in the Table 3.4 and 3.5.

 

Table 3.4    Summaries of Noise Monitoring Results at Ash Lagoon and Pak Kok Tsui

 

Location

Average 5-min Leq Noise Level (dB(A))

(Range)

Daytime

07:00-19:00 hrs on normal weekdays

Evening-time

07:00-23:00 hrs on holidays and 19:00-23:00 hrs on all other days

Night-time

23:00-07:00 hrs of next day

Ash Lagoon

61.8

(53.471.7)

56.9

(52.8 – 64.6)

56.3

(53.4 – 64.5)

Pak Kok Tsui

54.9

(46.8-63.9)

53.0

(44.0-62.4)

52.4

(45.3-61.9)

 

Table 3.5          Summaries of Monthly Noise Data at the Existing Ching Lam Noise Monitoring Station

 

Month

Monthly Average 30-min Leq Noise Level (dB(A))

07:00-19:00

19:00-23:00

23:00-07:00 of next day

December 1999

59.0

57.3

56.9

January 2000

58.0

56.8

56.4

February 2000

58.2

57.0

56.9

March 2000

59.0

57.6

56.8

April 2000

57.3

56.0

56.0

May 2000

59.3

57.8

57.5

June 2000

58.3

57.4

56.6

July 2000

58.1

57.4

56.4

August 2000

57.7

57.5

56.5

September 2000

57.0

57.1

56.4

October 2000

56.0

55.3

54.9

November 2000

55.8

55.1

55.0

 

 

The baseline noise levels at Ash Lagoon, Pak Kok Tsui and Ching Lam will be used for applying correction to the corresponding impact noise monitoring data in daytime of normal weekdays of 30-min Leq and in other time periods of 5-min Leq.

 

Observations 

 

The ET members identified no major activities which might have affected the baseline monitoring.

 

3.7              Monitoring Frequency, Action and Limit Levels

 

            The monitoring frequency, Action and Limit Levels (AL Levels) were established in accordance with the EM&A Manual.  Table 3.6 presents the AL levels for construction noise.

 

Table 3.6          Monitoring Frequency and Action & Limit Levels of Construction Noise (Other than Percussive Piling)

 

Parameters

Frequency

Action

Limit

1.      Noise Levels at the NSRs at Long Tsai Tsuen/Hung Shing Ye and school within the village of Tai Wan San Tsuen predicted by the noise alarm monitoring system

Continuous

When one or more documented complaints are received

a. 75 dB(A) in LAeq,30 min (07:00-19:00 hrs on normal weekdays)  (Note 2)

b. subject to statutory control under the Noise Control Ordinance (07:00-23:00 hrs on holidays; 19:00-23:00 hrs on all other days)

c. subject to statutory control under the Noise Control Ordinance (23:00-07:00 hrs of next day)

2.      Manual noise monitoring at the nearest Pak Kok Tsui residences to cable landing points N4 and N5 (Note 1)

Twice per week (period a); once per week (periods b-c)

Note:

1.         One set of measurements shall include one LAeq,30 min for period a or three consecutive LAeq,5 min, for periods b and c.

2.        For educational institution, the limit level shall be 70 dB(A), reduced to 65 dB(A) during examination periods.

 



 


4.                  Water Quality

 

The detailed baseline monitoring results of marine water quality prepared by a water quality monitoring consultant are attached in Annex J.

4.1              Action and Limit Levels

 

The Action and Limit levels for water quality determined by the water quality consultant are extracted in the following table.

 

Table 4.1          Action and Limit Levels for Water Quality

 

 

Table 4.1a.  Field Measurement of Dissolved Oxygen (mg/L)

 

 

 

(a) Surface and Middle

 

 

 

 

 

 

 

SR1

SR2

SR4

SR5

SR6

SR7

Action Level (5%-ile)

6.0

6.0

6.1

6.0

6.0

6.0

1%-ile

6.0

6.0

6.0

6.0

5.8

5.7

Limit Level

4.0

Note:

 

1.

All impact monitoring stations were considered to be non-FCZ stations

2.

Since the calculated 1%-ile results are larger than 4.0 mg/L, therefore the Limit Levels are proposed to be 4.0 mg/L according to the EM&A Manual

 

 

 

 

 

 

 

(b ) Bottom

 

 

 

 

 

 

 

SR1

SR2

SR4

SR5

SR6

SR7

Action Level (5%-ile)

5.9

6.0

6.1

6.1

6.1

6.1

1%-ile

5.9

5.9

5.9

5.9

5.7

5.7

Limit Level

2.0

Note:

 

 

 

 

 

 

1.

Since the calculated 1%-ile results are larger than 2.0 mg/L, therefore the Limit Levels are proposed to be 2.0 mg/L according to the EM&A Manual

 



 

 

 

 

 

 

Table 4.1b. Turbidity (NTU)

 

 

 

 

 

(depth-average)

 

 

 

 

 

 

 

SR1

SR2

SR4

SR5

SR6

SR7

Action Level (95%-ile)

17.9

16.3

13.2

17.5

17.2

17.3

Limit Level (99%-ile)

22.8

19.0

13.6

18.3

17.9

21.5

Note:

 

 

 

 

 

 

1.

The Action Levels can be 95%-ile of baseline data as mentioned above or 120% of upstream control station at the same tide of the same day according to the EM&A Manual

2.

The Limit Levels can be 99%-ile of baseline data as mentioned above or 130% of upstream control station at the same tide of the same day according to the EM&A Manual




 






 

 

 

 

 

 

 

 

Table 4.1c  Suspended Solids (mg/L)

 

 

 

 

 

 

(depth-average)

 

 

 

 

 

 

 

 

SR1

SR2

SR3

SR4

SR5

SR6

SR7

95%-ile

16.8

15.3

13.8

17.6

17.5

16.9

17.5

Action Level

16.8

15.3

--

17.6

17.5

16.9

17.5

 99%-ile

18.9

15.5

17.0

19.1

18.4

23.5

19.0

Limit Level

18.9

15.5

100.0

19.1

18.4

23.5

19.0

Note:

 

1.

No Action Level is applied for SR3 according to the EM&A Manual

2.

Limit Level of SR3 is 100 mg/L according to the EM&A Manual

3.

The Action Levels can be 95%-ile of baseline data as mentioned above or 120% of upstream control station at the same tide of the same day according to the EM&A Manual

4.

The Limit Levels can be 99%-ile of baseline data as mentioned above or 130% of upstream control station at the same tide of the same day according to the EM&A Manual

 

Table 4.1d  Unionized Ammonia (mg/L)

 

 

 

 

(depth-average)

 

 

 

 

 

 

 

SR1

SR2

SR4

SR5

SR6

SR7

Action Level (95%-ile)

0.006

0.005

0.003

0.001

0.001

0.001

99%-ile

0.007

0.005

0.003

0.002

0.001

0.003

Limit Level

0.021

0.021

0.021

0.021

0.021

0.021

Note:

 

1.

Since the calculated 99%-ile results are smaller than 0.021 mg/L, therefore the Limit Levels are proposed to be 0.021 mg/L according to the EM&A Manual.

 

 

 


 

 

 

 

 

Table 4.1e  Total Inorganic Nitrogen (mg/L)

 

 

 

 

(depth-average)

 

 

 

 

 

 

 

SR1

SR2

SR4

SR5

SR6

SR7

Action Level (95%-ile)

0.25

0.23

0.11

0.11

0.11

0.12

99%-ile

0.27

0.25

0.12

0.11

0.11

0.13

Limit Level

0.40

0.25

0.12

0.11

0.11

0.13

Note:

 

 

 

 

 

 

1.

Since the calculated 99%-ile results for SR2 to SR7 are larger than 0.1 mg/L, therefore the Limit Levels for SR2 to SR7 are proposed to be the calculated 99%-ile data according to the EM&A Manual.

2.

Since the calculated 99%-ile result for SR1 is smaller than 0.4 mg/L, therefore the Limit Level for SR1 is proposed to be 0.4 mg/L according to the EM&A Manual.

 


5.                  Marine Ecological Survey

 

The baseline monitoring results of marine ecology prepared by an ecological survey consultant are attached in Annex K. In response to the comments made by the Agriculture, Fisheries and Conservation Department on 9/2/2001, the ecological consultant has compiled additional information given in Annex L.

 

 


6.                  Conclusion

 

The baseline air quality monitoring was conducted in the first quarter of 2000.  The baseline water quality monitoring was conducted between November and early December 2000.   The monitoring results were used to establish the Action/Limit Levels for the relevant parameters of the Project during impact/compliance monitoring throughout construction.   The proposed Action and Limit Levels for air quality can be found in Tables 2.6 and 2.7 of the baseline monitoring report while that for water quality can be found in Table 4.1 of the baseline monitoring report.

 

The baseline noise monitoring was conducted in November 2000.   The monthly 30-minute Leq's measured at the existing Ching Lam noise monitoring station in the past 12 months (viz. from December 1999 to November 2000) were regarded as the baseline noise levels.   The baseline noise monitoring results would be used for applying background correction to the noise levels at the corresponding monitoring locations.

 

Baseline marine ecological monitoring was conducted in November 2000 to establish the status of scleractinian and soft coral assemblages prior to the commencement of the reclamation work. 

 

No major activities influencing air quality, noise, water quality and marine ecological survey were identified while carrying out baseline monitoring.