Lamma
Power Station Extension
Baseline Monitoring
Report
April
2001
TABLE OF CONTENTS
1.3 Structure
of the Baseline Monitoring Report
2.3 Monitoring
Parameters, Frequency and Duration
3.3 Monitoring
Parameters, Frequency and Duration
3.7 Monitoring
Frequency, Action and Limit Levels
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 1.3 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
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.
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.
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.
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.
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
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.
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 |
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 |
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 |
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
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.
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) |
No major activities influencing air quality were
identified during the baseline monitoring.
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.
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.
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 |
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.
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 |
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.
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 (53.4 – 71.7) |
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.
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. |
|||
The detailed baseline monitoring
results of marine water quality prepared by a water quality monitoring
consultant are attached in Annex J.
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. |
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Table 4.1e Total Inorganic
Nitrogen (mg/L) |
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(depth-average) |
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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 |
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Note: |
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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. |
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|
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. |
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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.
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.