Allied Environmental Consultants Limited
(AEC) has been appointed to conduct an environmental monitoring and audit
(EM&A) program for the proposed Joint User Complex and
Wholesale Fish Market at Area 44, Tuen Mun. The construction works was
commenced on 31st July 2008. This report is
the first monthly EM&A report, which details the environmental monitoring
and audit results recorded during the period from 31st July 2008 to 31st
August 2008. There have been no reporting changes.
Impact environmental monitoring for the proposed Joint User Complex and Wholesale Fish Market at Area
44, Tuen Mun has been carried out on 1st,
7th, 13th, 19th, 25th , and 30th
August 2008 at Block 15, Yuet Wu Villa. 1-hr TSP and
noise monitoring were conducted within the period of 0700-1900 hours, where
24-hr TSP monitoring was conducted continuously for a 24-hour period.
1-hour TSP monitoring results at the monitoring location ranged from 107μg/m3 to 206μg/m3
with an average of 149μg/m3. 24-hour TSP monitoring results ranged
from 74μg/m3 to 94μg/m3 with an average of 85μg/m3.
Noise monitoring results at the monitoring
location ranged from 63.1dB(A)
to 64.2dB(A) with an average of 63.6dB(A).
Based
on the monitoring results, the air quality and construction noise level complied
with the environmental requirements in EM&A Manual. There were no
environmental complaints received in the reporting month. No notification of summons
or prosecution was received.
Construction
activities to be undertaken in September 2008 include the continuation of jack
piling, pre-boring, drainage diversion, and internal finishing. Potential
environmental impacts include dust generation from stockpiles of dusty
materials, the drainage diversion work, and pre-boring; noise from operation of
the equipments and jack piling; runoff from drainage diversion works, and
pre-boring; and the storage of various C&D and chemical wastes. The
Contractor should properly implement the required environmental mitigation
measures as per the implementation schedule in the EM&A manual to ensure no
significant adverse environmental impacts to be arisen from the construction
works. The Contractor was reminded to maintain good housekeeping throughout the
construction phase.
A Joint User
Complex and Wholesale Fish Market (WFM Complex) at Area 44 in
Tuen Mun is proposed to be designed and built by Architectural Services
Department on behalf of Agriculture, Fisheries and Conservation Department,
Marine Department, and Food and Environmental Hygiene Department of the Hong
Kong SAR. The WFM Complex is to provide a permanent site for the relocation of
the existing temporary wholesale fish market at Tuen Mun Area 27 and to
accommodate a community hall and dragon boat racing spectator stand for public
use. The proposed development is a 3-storey complex to accommodate the
wholesale fish market at the ground floor, a community hall on the first and
second floors, and an extensive landscaped deck on roof level. The proposed Wholesale
Fish Market is categorized as a designated project under the Environmental
Impact Assessment Ordinance (EIAO) and therefore a detailed Environmental
Impact Assessment (EIA-085/2002) has been conducted in year 2002 and an
Environmental Permit (EP-296/2007) was issued by Environmental Protection
Department in December 2007.
The subject site is located at Castle Peak
Bay of Tuen Mun given in Figure 1. The
subject site is bounded to the north by a future local
open space presently used as a temporary car park, to the east by Castle Peak Bay typhoon shelter, to the south by a
future lorry park and to the west by Wu
Shan Road. Yuet Wu Villa being the nearest
residential establishment is located at around 85m from the site boundary.
1.1 Project
Organization and Contact Personnel
Key personnel and contact particulars are summarized in Table 1.
Table 1 Contact
Details of Key Personnel
|
Role
|
Department
/ Company
|
Names
|
Contact
Number
|
Fax
Number
|
|
Lead User
Department
|
Agriculture,
Fisheries, and Conservation Department
|
Mr. K.H. Chan
Ms. Louise Li
|
2150 7092
2150 7140
|
2314 2866
|
|
Environmental
Permit Holder
|
Architecture
Services Department
|
Mr. S.W. Chow
Ms. Susana Chan
|
2867 3716
2867 6706
|
2523 9622
|
|
Architect
|
P&T
Architects and Engineers Ltd.
|
Ms. Sarah Ng
Ms. Vivian Law
|
2835 3548
2832 3046
|
2891 3834
|
|
Main
Contractor
|
W. Hing
Construction Co. Ltd.
|
Mr. Andy Chan
Mr. Tim Wong
|
9630 7404
6478 4623
|
8343-9188
|
|
Environmental
Team Leader
|
Allied
Environmental Consultants Ltd.
|
Ms. Grace
Kwok
|
2815 7028
|
2815 5399
|
|
Independent
Environmental Checker
|
Cinotech
Consultants Ltd.
|
Mr. Alex
Ngai
|
2151 2083
|
3107 1388
|
Air Sensitive Receivers (ASRs) within 500m include Yuet Wu Villa, Lawn Bowling
Field, Tennis Court,
which are less than 100m
away from the subject site. Tuen Mun Wu Hong Clinic is located to the west at
about 100m to the
site boundary. Two secondary schools, namely Ka Chi Secondary School and South Tuen
Mun Government
Secondary School, are
approximately 300m to the
south of the site boundary.
Noise Sensitive Receivers (NSRs) within 300m are Yuet Wu Villa, Siu Hei Court, Yan Chai Hospital Low
Chan Chor
Si Primary
School and Wu King Estate. The nearest NSR will
be Block 15 of Yuet Wu Villa.
The major works undertaken and/or completed during the
monitoring period are listed below:
-
Preboring works
-
Jack piling works
-
Drainage diversion works
-
Internal finishing
-
EMSD submission for Cooling Towers
Table 2
shows the interrelationship between construction activities and environmental
mitigation measures for the reporting month.
Table 2 Interrelationship
between Construction Activities and Mitigation Measures
|
Construction
Works
|
Major Environmental Impact
|
Mitigation Measures
|
|
Pre-boring
|
Noise, air quality, and water quality impacts
|
Water spraying, avoided rainy days,
wastewater treated before discharging
|
|
Jack piling
|
Noise impact
|
Well-maintained plants were used
|
|
Drainage diversion
|
Air quality, and water quality impacts
|
Water spraying, avoided rainy days
|
For regular
impact monitoring, the sampling frequency of at least once in every six-days,
shall be strictly observed at the monitoring station for 24-hr TSP
monitoring. For 1-hr TSP
monitoring, the sampling frequency of at least three times in every six-days
should be undertaken when the highest dust impact occurs. For noise monitoring,
one set of measurement between 0700-1900 hours on normal weekdays. Leq(30 min) shall be used as the monitoring parameter.
From baseline monitoring results, the proposed Action and Limit Levels for air quality are summarized in Table 3. The average baseline 1-hr TSP value of 129μg/m3 and 24-hr TSP value of 65μg/m3
measured at Block 15, Yuet Wu Villa was used to determine the action and limit
level for air quality impact monitoring. The proposed Action and Limit Levels
for construction noise are summarized in Table 4.
Table 3 Action
and Limit Level for Air Quality Impact Monitoring at Yuet Wu Villa
|
Parameters
|
Baseline Level (μg/m3)
|
Action Level (μg/m3)
|
Limit Level (μg/m3)
|
|
24 Hour TSP Level
|
65
|
173
|
260
|
|
1 Hour TSP Level
|
129
|
334
|
500
|
Table 4
Action and Limit Levels for Construction Noise Impact Monitoring
|
Time
Period
|
Action
Level
|
Limit Level
|
|
Daytime (0700-1900 hours) on weekdays
|
When one documented compliant is received
|
Dwelling 75dB(A)1
School 70dB(A)1
(65dB(A) during
examinations)1
|
|
1900-2300 on any day and 0700-2300 on Sunday
and general holidays, for use of PME2
|
When one documented compliant is received
|
65dB(A)3
|
|
All days during the night-time (2300-0700
hours) 2
|
When one documented compliant is received
|
50dB(A)3
|
Note: 1. Construction
noise criteria stipulated in the TM-EIAO
2. A Construction Noise Permit (CNP) shall be required for the carrying out
of the construction work during the restricted hours (1900-2300
on any day and 0700-2300 on Sunday and general holidays, for use of PME; and All
days during the night-time (2300-0700 hours))
3. Area sensitivity rating of the monitoring location
is “B”.
Should non-compliance of the above Action and Limit levels occurs, the
contractor shall undertake corresponding in accordance with the proposed Event
Action Plan given in EM&A Manual. A summarized general Event Action Plan is
given in Table 5. Details should be referred
to the Event Action Plan in the EM&A Manual.
Table 5 Event
Action Plan
|
Level
|
Step
1
|
Step
2
|
Step
3
|
|
Action
|
l Identify source
l Check monitoring data and working methods
|
l Contact project manager to discuss and
implement remedial action
l Rectify any unacceptable practice
l Amend working methods if appropriate
l If exceedance continues, commence
additional monitoring
|
l Notify client/project manager following
correct of the situation
l Cease additional monitoring if exceedance
stops
|
|
Limit
|
l Identify source
l Notify client/project manager
l Check monitoring data and working methods
l Repeat measurement to confirm finding
l Commence additional monitoring
|
l Take immediate action to avoid further
exceedance
l Submit proposal for remedial actions to
client/project manager within 3 working days
l Implement the agreed proposal
l If exceedance continues, amend and
resubmit the proposal
|
l Notify client/project manager following
correction of the situation
l Cease additional monitoring if exceedance
stops
|
A summary of the
current status on licences and/or permits on environmental protection pertinent
to the Project is shown in Table 6, and EP’s
submission compliance is summarized in Table 7.
Table 6 Cumulative
Summary of Valid Licences and Permits
|
Permits and/or Licences
|
Licence No.
|
Issued Date
|
Valid Period
|
Status
|
|
Waste Producer licence
|
EP760/422/013308/I
|
30
Apr 2008
|
N/A
|
Valid
|
|
Waste Disposal Licence
|
RW/00459
(Application No.)
|
TBA
|
N/A
|
Application
in progress
|
|
Chemical Waste Producer Licence
|
WPN5218-422-W2894-21
|
19
May 2008
|
|
Valid
|
|
Effluent Discharge Licence
|
EP760/422/013308/I
|
18 July 2008
|
18 July 2008 to 31 July 2013
|
Valid
|
Table 7 EP’s
Submission Compliance Table
|
Item
|
Submission Date
|
EP’s Submission
Deadline
|
|
Baseline Report
|
18 July 2008
|
18 July, 2008
|
|
Setup of Website
|
29 Aug 2008
|
29 Aug 2008
|
Air quality monitoring and noise
monitoring were conducted at Block 15, Yuet Wu Villa on
on 1st,
7th, 13th, 19th, 25th and 30th
August 2008. Air quality monitoring station was set up
at the roof top of the residential block and noise monitoring was conducted at 1.2m above ground level at the junction of Wu Sau Street and
Wu On Street as given in Figure 2 and 3. Figure 4 and 5
show photos taken during monitoring at the two locations.
1-hour and 24-hour TSP air quality monitoring was conducted at the
designated air quality monitoring location using a High Volume TSP Sampler (Model No: Anderson GMWS-2310 ACCU-VOL) at the designated location. The Calibration Record of the High-Volume TSP
Sampler is given in Appendix A. 24-hour TSP samples were taken every six
days. 1-hour TSP samples were taken three times a day between
0700-1900 hours.
Noise monitoring was conducted
at the designated noise monitoring location between 0700-1900 hours using a sound
level meter which complies with the International Electrotechnical Commission
Publications 651:1979 (Type 1) and 804:1985 (Type 1). Noise instrumentation
details are given in Table 8 and the
Calibration Certificate for the sound level meter and calibrator is given in Appendix B.
Table 8 Noise
Monitoring Equipment
|
Manufacturer
|
Type/Model No.
|
Equipment
|
|
RION
|
Model NL 31
|
Precision Sound Level Analyzer with windshield
|
|
RION
|
Model NC 73
|
Calibrator
|
Noise levels measurements
were recorded in terms of thirty minutes A-weighted equivalent continuous sound
pressure level (Leq(30min)) on a weekly basis. The sound level meter was
calibrated immediately prior to and following each noise measurement. The meter
was mounted on a tripod at a height of 1.2m
and the microphone was positioned at 1m
away the building façade of the noise monitoring station facing the
construction site.
Noise measurements were not made in the presence of fog, rain, and wind
with a steady speed exceeding 5m/s
or wind with gusts exceeding 10m/s.
The wind speed was checked with a portable anemometer capable of measuring the
wind speed in m/s.
1-hour and 24-hour TSP monitoring results are
summarized in Table 9 and 10 and serve as the basis for determining the action and limit levels. The
minimum and maximum 1-hour TSP measured at Yuet Wu Villa was 107μg/m3 and 206μg/m3 respectively with an average of 149μg/m3.
The minimum and maximum 24-hour TSP measured was 74μg/m3 and 94μg/m3
respectively with an average of 85μg/m3. Summary of air
quality monitoring record is provided in Appendices C and D.
Table 9 1-Hour
TSP Monitoring Results
|
Day
|
Date
|
1-hr TSP (μg/m3)
|
Average
(μg/m3)
|
|
Reading 1
|
Reading 2
|
Reading 3
|
Average
|
|
1
|
1 Aug 2008
|
178
|
204
|
206
|
196
|
149
|
|
2
|
7 Aug 2008
|
159
|
170
|
155
|
161
|
|
3
|
13 Aug 2008
|
180
|
177
|
149
|
169
|
|
4
|
19 Aug 2008
|
135
|
129
|
128
|
131
|
|
5
|
25 Aug 2008
|
128
|
107
|
109
|
115
|
|
6
|
30 Aug 2008
|
123
|
123
|
117
|
121
|
Table 10 24-Hour
TSP Monitoring Results
|
Day
|
Date
|
24-hr TSP (μg/m3)
|
|
1
|
1 Aug 2008
|
94
|
|
2
|
7 Aug 2008
|
85
|
|
3
|
13 Aug 2008
|
80
|
|
4
|
19 Aug 2008
|
84
|
|
5
|
25 Aug 2008
|
74
|
|
6
|
30
Aug 2008
|
90
|
|
|
Average
|
85
|
Noise monitoring results in terms of Leq(30min), L10(30min)
L90(30min) measured at the designated noise monitoring location are summarized
in Table 11. L10 and L90
represent sound levels that are exceeded 10% and 90% of the time respectively.
Normally, L10 measurements can be considered as the average peak
levels, whilst L90 levels can be considered as the average
background noise levels.
During the reporting month, the minimum and maximum noise level measured at Yuet Wu Villa was 63.1dB(A) Leq(30min)
and 64.2dB(A) Leq(30min) respectively with an average of 63.6dB(A) Leq(30min).
No exceedance was recorded in this reporting period. Summary of noise monitoring record is
provided in Appendix E.
Table 11 Noise
Monitoring Results
|
Day
|
Date
|
L10(30mins) (dB(A))
|
L90(30mins) (dB(A))
|
Leq(30mins)
(dB(A))
|
|
1
|
1 Aug 2008
|
67.4
|
56.3
|
64.2
|
|
2
|
7 Aug 2008
|
65.7
|
55.0
|
63.1
|
|
3
|
13 Aug 2008
|
64.7
|
57.1
|
63.4
|
|
4
|
19 Aug 2008
|
65.1
|
55.8
|
64.1
|
|
5
|
25 Aug 2008
|
64.5
|
58.1
|
63.8
|
|
Day
|
Date
|
L10(30mins) (dB(A))
|
L90(30mins)
(dB(A))
|
Leq(30mins)
(dB(A))
|
|
6
|
30 Aug 2008
|
64.7
|
56.6
|
63.2
|
|
|
Average
|
65.4
|
56.5
|
63.6
|
Weather data of the monitoring station were obtained from the nearest
Hong Kong Observatory (HKO) Tuen Mun automatic weather station located at Tuen
Mun Town Park (63 mPD). Table 12 summarizes the wind data
during the monitoring dates. Wind record from HKO is shown in Appendix F.
Table 12 Summary of
Weather Conditions during the Monitoring Period
|
Date
|
Weather
|
Prevailing
Wind direction
|
Daily Average
Wind speed (m/s)
|
|
1 Aug 2008
|
Cloudy
|
SSE
|
2.71
|
|
7 Aug 2008
|
Cloudy
|
SSE
|
4.47
|
|
13 Aug 2008
|
Sunny
|
SW
|
1.96
|
|
19 Aug 2008
|
Sunny
|
SSE
|
2.68
|
|
25 Aug 2008
|
Sunny
|
SSE
|
3.54
|
|
30 Aug 2008
|
Sunny
|
SW
|
1.94
|
Four site
inspections were conducted by the Environmental Team (ET) in this reported
period. Major observations by the ET, actions by the Contractor and outcome are
summarized in the Table 13.
Table 13 Summary
of Site Inspections
|
Date
|
Observations
|
Action taken by contractor
|
Outcome
|
|
5/8/2008
|
Some stagnant water observed on site after
raining
|
To clean up the stagnant water
immediately
|
The situation is rectified immediately
|
|
12/8/2008
|
Some stagnant water observed on site
after raining
|
To clean up the stagnant water
immediately
|
The situation is rectified immediately
|
|
19/8/2008
|
Construction waste and debris on site.
|
To be removed, collected, and send to
appropriate destinations.
|
The situation is rectified immediately.
|
|
Date
|
Observations
|
Action taken by contractor
|
Outcome
|
|
26/8/2008
|
Some stagnant water observed on site.
|
To clean up the stagnant water
immediately
|
The situation is rectified immediately
|
During site inspections in the reporting month, no non-conformance of implementation
of environmental mitigation measures was identified. All environmental mitigation measures for construction
stages stated in approved EIA Report, EM&A Manual and Environmental Permit
shall be carried out throughout the whole construction period as shown in Appendix G.
In this reporting
period, no complaint, inspection notice, notification of summons
or prosecution was received.
Jack piling works
will be continued in the following months, and superstructure works will
commence in September 2008.
17.21 tonnes of inert
C&D waste was disposed at public fill. 7.26 tonnes of waste was disposed to
landfill. No chemical waste was transported off site in this reported period.
Environmental monitoring
has been carried out for the proposed Joint User Complex and Wholesale Fish Market at Area 44, Tuen Mun. 1-hour and 24-hour TSP air quality monitoring and noise monitoring was
conducted at Block 15, Yuet Wu Villa during the period from 31st July
2008 to 31st August 2008. All monitoring results were checked and
reviewed.
The average 1-hour
TSP level is 149μg/m3 and average 24-hour TSP level is 85μg/m3. For impact noise monitoring,
the 30-minute average noise level is 63.6dB(A). No environmental complaints and notification of
summons or prosecution were received during the reporting period.
Author:
