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 second monthly EM&A report, which details the environmental monitoring
and audit results recorded during the period from 1st September 2008 to 30th
September 2008.
Impact environmental monitoring for the proposed Joint User Complex and Wholesale Fish Market at Area
44, Tuen Mun has been carried out on 5th,
11th, 17th, 23rd and 29th September
2008 at Block 15, Yuet Wu Villa. Baseline 1-hr TSP and noise monitoring
were conducted within the period of 0700-1900 hours, where baseline 24-hr TSP
monitoring was conducted continuously for a 24-hour period.
1-hour TSP monitoring results at the monitoring location ranged from 116μg/m3 to 217μg/m3
with an average of 156μg/m3. 24-hour TSP monitoring results ranged
from 55μg/m3 to 91μg/m3 with an average of 78μg/m3.
Noise monitoring results at the monitoring
location ranged from 61.8dB(A)
to 63.0dB(A) with an average of 62.5dB(A).
Based
on the monitoring results, the air quality and construction noise level shall
comply with the environmental requirements in EM&A Manual. There were no
breaches of the action and limit levels. There were no environmental complaints
received in the reporting month. No
notification
of summons or prosecution was received.
Construction
activities to be undertaken in October 2008 include the continuation of jack
piling, drainage diversion, and superstructure works. 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, Home Affairs 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, a dragon boat racing spectator
stand, and other community facilities for public use. The proposed development is a 3-storey
complex to accommodate a wholesale fish market, a public toilet, a refuse collection
point and a marine refuse collection point at the ground floor, a community hall
on the first floor, and a dragon boat race spectator stand with 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.
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, 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:
-
Pre-boring works
-
Jack piling works
-
Drainage diversion works
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 the 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
|
Air quality monitoring and noise
monitoring were conducted at Block 15, Yuet Wu Villa on
5th,
11th, 17th, 23rd and 29th September
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.
A
construction site for the proposed Junior Police Officers' Married Quarters is
located at 110m away
from the monitoring location, which can be a major source of the noise and TSP
generation during the monitoring period. Figure 6
shows the photos of the construction site.
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 6 and the
Calibration Certificate for the sound level meter and calibrator is given in Appendix B.
Table 6 Noise
Monitoring Equipment
|
Manufacturer
|
Type/Model No.
|
Equipment
|
|
RION
|
Model NL 31
|
Precision Sound Level Analyser 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 daily 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 7 and 8 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 116μg/m3 and 217μg/m3 respectively with an average of 156μg/m3.
The minimum and maximum 24-hour TSP measured was 55μg/m3 and 91μg/m3
respectively with an average of 78μg/m3. Summary of air
quality monitoring record will be provided in Appendix C and D.
Table 7 1-Hour
TSP Monitoring Results
|
Day
|
Date
|
1-hr TSP (μg/m3)
|
Average
(μg/m3)
|
|
Reading 1
|
Reading 2
|
Reading 3
|
Average
|
|
1
|
5 Sept 2008
|
152
|
177
|
136
|
155
|
156
|
|
2
|
11 Sept 2008
|
133
|
181
|
136
|
150
|
|
3
|
17 Sept 2008
|
213
|
116
|
217
|
182
|
|
4
|
23 Sept 2008
|
129
|
132
|
142
|
134
|
|
5
|
29 Sept 2008
|
174
|
146
|
159
|
160
|
Table 8 24-Hour
TSP Monitoring Results
|
Day
|
Date
|
24-hr TSP (μg/m3)
|
|
1
|
5 Sept 2008
|
82
|
|
2
|
11 Sept 2008
|
55
|
|
3
|
17 Sept 2008
|
91
|
|
4
|
23 Sept 2008
|
73
|
|
5
|
29 Sept 2008
|
90
|
|
|
Average
|
78
|
Noise monitoring results in terms of Leq(30min), L10(30min)
L90(30min) measured at the designated noise monitoring location are summarized
in Table 9. 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 61.8dB(A) Leq(30min)
and 63.0dB(A) Leq(30min) respectively with an average of 62.5dB(A) Leq(30min).
No exceedance was recorded in this reporting period. Summary of noise monitoring record will be
provided in Appendix E.
Table 9 Noise
Monitoring Results
|
Day
|
Date
|
L10(30mins) (dB(A))
|
L90(30mins) (dB(A))
|
Leq(30mins) (dB(A))
|
|
1
|
5 Sept 2008
|
63.6
|
56.6
|
62.4
|
|
2
|
11 Sept 2008
|
63.3
|
56.5
|
61.8
|
|
3
|
17 Sept 2008
|
64.2
|
57.0
|
62.8
|
|
4
|
23 Sept 2008
|
64.3
|
56.2
|
63.0
|
|
5
|
29 Sept 2008
|
65.6
|
58.8
|
62.5
|
|
|
Average
|
64.2
|
56.6
|
62.5
|
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 10 summarizes the wind data
during the monitoring dates. Wind record from HKO will be shown in Appendix
F.
Table 10 Summary of
Weather Conditions during the Monitoring Period
|
Date
|
Weather
|
Prevailing
Wind direction
|
Daily Average
Wind speed (m/s)
|
|
5 Sept 2008
|
Sunny
|
S
|
1.78
|
|
11 Sept 2008
|
Sunny
|
NW
|
1.78
|
|
17 Sept 2008
|
Sunny
|
SE
|
2.03
|
|
23 Sept 2008
|
Cloudy
|
N
|
3.51
|
|
29 Sept 2008
|
Sunny
|
NE
|
4.14
|
5 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 11.
Table 11 Summary
of Site Inspections
|
|
Date
|
Observations
|
Action taken by Contractor
|
Outcome
|
|
1
|
5/9/2008
|
Stagnant water observed on site.
|
Stagnant water is cleaned up immediately.
|
The situation is rectified immediately.
|
|
2
|
12/9/2008
|
Rubbish found on site.
|
Rubbish was cleared immediately.
|
The situation is rectified immediately.
|
|
3
|
17/9/2008
|
Two oil drums were placed on bare land.
Rubbish found on site
|
Drip tray is placed immediately.
Rubbish was cleared immediately.
|
The situation is rectified immediately.
|
|
4
|
23/9/2008
|
Most fuel drums were placed on bare land.
Exposed surface was not properly covered
by tarpaulin sheet.
|
Drip tray is placed immediately.
Exposed surface is covered immediately.
|
The situation is rectified immediately.
|
|
5
|
30/9/2008
|
An oil drum was placed on bare land.
Exposed surface was not properly covered
by tarpaulin sheet.
|
Drip tray is placed immediately.
Exposed surface is covered immediately.
|
The situation is rectified immediately.
|
In this reporting
period, no complaint, inspection notice, notification of summons
or prosecution was received. No non-compliance was recorded.
614.09m3 of inert C&D waste was
disposed at public fill. 0 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 1st September
2008 to 31st September 2008.
The average 1-hour
TSP level is 156μg/m3 and average 24-hour
TSP level is 78μg/m3. For impact noise monitoring,
the 30-minute average noise
level is 62.5dB(A) .
Author:
