Ha Noi Metro Rail System Project (Line 3

External Environmental Monitoring Report

October 2020 – October 2021

May 2022

Viet Nam: Ha Noi Metro Rail System

Project (Line 3: Nhon-Ha Noi Station

Section)

Appendix 4.2

Prepared by TPF Getinsa Euroestudios (Project Management Support Phase 2 Consultant) for Ha Noi People’s Committee and the Asian Development Bank.

NOTE

In this report, “$” refers to US dollars. This external environmental monitoring report is a document of the borrower. The views expressed herein do not necessarily represent those of ADB's Board of Directors, Management, or staff, and may be preliminary in nature. In preparing any country program or strategy, financing any project, or by making any designation of or reference to a particular territory or geographic area in this document, the Asian Development Bank does not intend to make any judgments as to the legal or other status of any territory or area.

Hanoi Pilot Light Metro line Project

Dự án đường sắt đô thị thí điểm Hà Nội Environmental monitoring report

Báo cáo quan trắc môi trường

Appendix/ Phụ lục 1: List of equipment/ Danh sách các thiết bị

a. Photo & description of monitoring equipment/ Ảnh và mô tả các thiết bị quan trắc

STT/

No.

Tên máy/ Name of

Equipment

Hình ảnh/ Picture Calibration

expiration/ Hạn hiệu chuẩn

Purpose to use/ Mục đích sử dụng/

1

C2P- 838-032

31/03/2021 Lấy mẫu không khí/

Sampling the air

2 Desega - GS

312

31/12/2021 Máy lấy mẫu không

khí/ Sampling the air

3 Extech -

445702

31/12/2021

May Đo các chỉ tiêu vi khí hậu / Meters for

microclimate indicators

4 Tenmars- TM103

31/12/2021 Máy đo tiếng ồn /

Noise meter

5 ACO – 3116 –

7812B

30/06/2021 Máy đo đọ rung/ Vibra-

tion Meter




b. List of PPE to be utilized, including while working near the lake.

Danh sách BHLĐ sử dụng trong quá trình quan trắc

1. Safety helmet/ Mũ bảo hộ

2. Safety vest/ Aó phản quang

3. Safety shoes/ Giày bảo hộ

4. Safety gloves/ Găng tay bảo hộ

5. Safety life vest/ 6. Aó phao




Appendix 2. Pictures for taking sample/ Hình ảnh lấy mẫu

Taking sample minutes/ Họp an toàn trước khi lấy mẫu

Taking sample pictures/ Hình ảnh lấy mẫu

Hanoi Pilot Light Metro Project Environmental monitoring report

Appendix 3: Monitoring results

(Please see next page for details)


Doc No: HGU-IMP-TRE-WAE-L10-00015-E-1A Page 4/31

Abbreviations

MRB Hanoi Metropolitan Railway Management Board

PIC Project Implementation Consultant (SYSTRA S.A.)

HGU Hyundai Engineering & Construction Co., Ltd. – Ghella S.p.A Joint Venture

(Underground Section)

EATC Environment Analysing & Technique…,JSC

Project References

Ref

No. Ref ID number Ref description

1 HGU-IMP-TRE-WAE-L10-00015-V-1A Environmental Monitoring

Report for Construction Stage 14



CONTENTS

1. INTRODUCTION ............................................................................................................... 6

1.1 General information: ............................................................................................................ 6

1.2 The project information: ....................................................................................................... 6

1.3 Environment monitoring activities: ....................................................................................... 6

2. MONITORING PROGRAM ................................................................................................ 7

2.1. Monitoring location ............................................................................................................. 7

2.2. Parameter and monitoring frequency ..................................................................................10

2.3. Method and monitoring equipment .....................................................................................11

2.4. Analysis method .................................................................................................................13

2.5. Position and sites for taking sample ....................................................................................14

2.6. Conditions of taking samples ..............................................................................................17

3. COMMENTS AND MONITORING RESULTS ASSESSMENT:......................................... 19

3.1. Noise monitoring ................................................................................................................19

3.2. Vibration monitoring ..........................................................................................................22

Diagram 11: Comparison Fe in surface water ............................................................................30

3.5 Soil Quality Monitoring.......................................................................................................30

4. COMMENTS AND RESULT ASSESSMENT ON QA/QC IMPLEMENTATION IN ENVI-

RONMENTAL MONITORING:............................................................................................... 30

4.1 Field QA/QC results: ........................................................................................................... 30

4.2 Lab QA/QC results: ............................................................................................................. 31

5. Risk assessment ................................................................................................................. 31

6. Conclusion & Recommendations ....................................................................................... 31

6.1 Conclusion ........................................................................................................................ 31

6.2 Recommendations: ............................................................................................................ 32

7. Appendices ........................................................................................................................ 32



1. INTRODUCTION

1.1 General information:

Construction contractor: Hyundai E&C Co., Ltd and Ghella S.P.A Joint Venture.

1.2 The project information:

Hanoi Pilot Light Metro Line, line 3, section Nhon - Hanoi Railway Station is a major

project for Hanoi City. According to the Hanoi Transportation Master Plan till 2022, total length

of HPLML (Line 3) shall reach 21,5km from Nhon to Hoang Mai. The first phase of this line,

and part of this Contract is from Nhon to Hanoi Railway Station, with about 8.5 km elevated

section and 4.0 km underground section. This line includes 12 stations (with 8 elevated and 4

underground stations). The Depot is located at Nhon with area of 150,550 m2.

Comply to environmental management plan, HGU has coordinated with EATC to con-

duct environmental monitoring and analysis at a frequency of 3 months.

During pre-construction period, environmental monitoring activities are subject to assess

quality of the environment in the project area before implementation of construction activities.

Simultaneously, these activities shall collect data which is the basis for assessing, comparing the

effects of road construction activities to environment quality. On the other hand, it is also essen-

tial requirements for environmental protection activities that HGU must be complied.

On 01,02th April 2021, HGU cooperated with EATC to carry out environmental moni-

toring and sampling for construction stage 14 of CP03 package.

1.3 Environment monitoring activities:

- Scopes of work: Analyzing environmental quality. Measuring noise, vibration, surface water, collecting data

Completing the Quarterly Environmental Monitoring Reports - Legal Documents for carrying out the monitoring process: The Environmental Protection Law of Vietnam 2014. Decree 18/2015/BTNMT on environmental protection planning, strategic environ-

mental assessment, environmental impact assessment and environmental protection planning. Circular 27/2015/TT-BTNMT on Strategic environmental assessment, environmen-

tal impact assessment and environmental protection law. Circular 43/2015/TT-BTNMT on state of the environment report, set of environ-

ment indicators and management of environment monitoring data. Circular 24/2017/TT-BTNMT dated September 01, 2017 on environmental moni-

toring techniques

Viet Nam Environment Standards for environmental protection is from 1998 to now.

https://thuvienphapluat.vn/van-ban/Tai-nguyen-Moi-truong/Circular-24-2017-TT-BTNMT-on-environmental-monitoring-techniques-367759.aspx?tab=1




Environmental Management Plan of project - Standards applicable:

Air environment: + Micro-environment: QCVN 26:2016/BYT. + Noise: QCVN 26:2010/BTNMT. + Vibration Acceleration: QCVN 27:2010/BTNMT. + Toxic gases: QCVN 05:2013/BTNMT. Water Environment: + Surface water: QCVN 08-MT:2015/BTNMT, column B2

+ Underground water: QCVN 09-MT:2015/BTNMT

Soil Environment: + Soil environment: QCVN 03-MT:2015/BTNMT

2. MONITORING PROGRAM

2.1. Monitoring location

2.1.1. Noise, vibration and air monitoring

Project Hanoi Pilot Light Metro Line section Nhon – Ha Noi railway station, environ-

mental monitoring activities for air, noise, and vibration has been followed by Circular

24/2017/TT-BTNMT dated September 01, 2017 on environmental monitoring techniques. Base

on approved CP03 – Environment monitoring Schedule, and CP03 construction activities on site

at Ramp, Station 9, Station 10, air, noise, vibration have been carried out at the same location as

the follow:

+ K 1: Area of 555 alley, Kim Ma street. Coordinates: N: 21° 1' 46.511" E: 105° 48' 35.370"

+ K 2: Area of 475 Kim Ma street, near Daewoo intersection. Coordinates: N: 21° 1' 53.269" E: 105° 49' 23.051"

+ K 3: Kim Ma communal house. Coordinates: N: 21° 1' 53.379" E: 105° 49' 42.073"

+ K 4: Area of Cat Linh Primary school, 31A Cat Linh Street, Dong Da District, Ha Noi. Coordinates:

N: 2101’44.464’’, E: 105049’45.798”

+ K5: Area of Temple of Literature gate. Coordinates: N: 2101’38.698’’, E: 105050’6.655”

+ K6: Area of Heart Hospital, Tran Hung Dao street, Ha Noi. Coordinates: N: 2101’24.514’’, E: 105050’36.167”

2.1.2. Water quality monitoring

Monitoring activities of surface water quality followed the Circular 24/2017/TT-BTNMT dated

September 01, 2017 on environmental monitoring techniques. Surface water monitoring activity is carried out at 2 locations






+ NM1: Surface water of Thu Le lake. Coordinates: N: 21° 1' 48.316" , E: 105° 48' 37.603"

+ NM2: Surface water of Giang Vo lake. Coordinates: N: 21° 1' 46.620", E: 105° 49' 11.558"

+ NM3: Surface water of Van Mieu lake. Coordinates: N: 21°01’36.880’’, E: 105°50’6.00”

2.1.3 Soil quality monitoring

+ Đ1: Soil sample taken at Ramp area. Coordinates: N: 21° 1' 48.61”, E: 105°48'36.025"

+ Đ2: Soil sample taken at Kim Ma station. Coordinates: N: 21° 1' 50.400”, E: 105°48'48.65"

+ Đ3: Soil sample taken at Cat Linh station. Coordinates: N: 21° 1' 46.602”, E: 105°49'47.009"

+ Đ4: Soil sample taken at Van Mieu station. Coordinates: N: 21° 1’38.309’’, E: 105°50’9.109”

+ Đ5: Soil sample taken at Ha Noi station. Coordinates: N: 21° 1’25.760’’, E: 105°50’36.002”

2.1.4 Sample location map

2.1.5 List of Environmental Monitoring Location.

Table 1: List of Environmental Monitoring Location



No Monitoring location Area Coordinates

Remark

N E

I Air Quality, Noise & Vibration

1 555 alley, Kim Ma street Ramp 21° 1' 46.511" 105° 48' 35.370"

Monitored

2 475 Kim Ma street, near Daewoo intersection

Station 9 21° 1' 53.269" 1050 49' 23.051"

Monitored

3 Kim Ma communal house

Shaft 21° 1' 53.379’’ 105° 49' 42.073”

Monitored

4

Cat Linh Primary school, 31A Cat Linh Street, Dong Da District, Ha Noi

Station 10 21°1’44.464’’ 105°

49’45.798” Monitored

5 Temple of Literature gate Station 11 21°1’38.698’’ 105°50’6.655” Monitored

6 Heart Hospital Station 12 21°1’24.514’’ 105°50’36.167” Monitored

II Surface Water Quality

1 Thu Le lake Ramp 21° 1' 48.316" 105°48'36.603" Monitored

2 Giang Vo lake Station 10 21° 1' 46.620" 105°49'11.558" Monitored

3 Van Mieu lake Station 11 21°01’36.880’’ 105°50’6.001” Monitored

III Ground Water Quality

Ground water quality monitoring will be conducted when tunneling work

starting Monitored

IV Soil

1 Ramp area Ramp 21° 1' 48.612" 105°48'36.025" Monitored

2 Kim Ma station Station 9 21° 1' 50.400" 105°48'48.652" Monitored

3 Cat Linh station Station 10 21° 1' 46.602" 105°49'47.009" Monitored

4 Van Mieu Station Station 11 21° 1’38.309’’ 105°50’9.109” Monitored

5 Ha Noi Station Station 12 21° 1’25.760’’ 105°50’36.002” Monitored



2.2. Parameter and monitoring frequency

Table 2: Parameter and monitoring frequency

No Parameter Location Frequency *

1. Noise

(Leq, Lmax) 6

Every three months during construction, 1 day

per each time, from 6:00AM –05:30 AM, 24

samples for each location. (3 times/ 1 sample)

2. Vibration

(V, G, F) 6

Every three months during construction, 1 day

per each time, from 6:00AM –05:30 AM, 24

samples for each location. (3 times/ 1 sample)

3

Air quality

HC, CO, SO2, NO2,

PM10 and micro climate

6

Air quality and micro - climate is measured in

one day at each position. Number of samples

are 24 per day from 6:00 AM to 5:30 AM with

frequency 1 hours measure 1 time.

4 Surface water quality

Temperature, Total ni-

trogen, Total phospho,

Crom, DO, TSS, Fe,

Mn, Cu, Hg, Cd, Zn, Ni,

As, Pb, Se, Total oil

3 Measured 2 times in day

5 Soil

Pb, Cd, Zn, As, Hg 5 Measured 1 time in day

Note:

- *: If there is no activity in a site for the last 3 months from the monitoring time, the

relevant monitoring is to be postponed



2.3. Method and monitoring equipment

Table 3: Monitoring and analysing equipment

No Equipment name Code Company/country of

production

Calibration

frequency

I Field monitoring equipment

1 Temperature, humidity kit RH 390-Extech Taiwan 1/year 2 Temperature, humidity kit Extech Taiwan 1/year

3 Temperature, humidity kit Extech Taiwan 1/year

4 Wind speed meter VWR VWR - USA 1/year

6 Noise meter Quest 2100 USA 1/year

7 Gas sampler kit SKC SKC-USA 1/year

8 Vibration meter 200M Balmac- USA 1/year

9 Multi-indicator water meter U52 Hoshiba- Japan 1/year

10 Air sampling equipment GS 312 Desega- Germany 1/year

11 Sibata dust sampler HR 1000 Sibata 1/year

12 Low flow air sampler PST 5000 Staplex 1/year

II Lab analyzing equipment 1 Turbidity meter 2100P USA 1/year

2 Water double distillation machine WSC/4D Hamilton 1/year

3 Analytical balance HR-200 USA 1/year

4 Sension 156 water parameters meas-

uring machine Sension 156 HACH-USA

1/year

5 Sample preservation cabinet VS 13023 Korea 1/year

6 ultraviolet variable spectrophotometer

DR/2400. DR/2400 HACH-USA

1/year

7 COD samples breaking kit Velp ITALIA 1/year

8 Spectrophotometer UV-VIS 2800. UVS-2800 Labomed-USA 1/year

9 Drying cabinet 53 litters UNB 400 Memmert-Germany 1/year

10 Incubator (microbiology brewing) UNB 100-500 Germany 1/year

11 Incubator (microbiology brewing) UNB 100-500 Germany 1/year

12 Ultraviolet variable

spectrophotometer DR/6000 DR/6000 HACH-USA

1/year

13 Furnace SX2 - 5 -12 China 1/year

14 Water-proof kitchen UNB Memmert-Germany 1/year

15 Water-proof shaker UNB Memmert-Germany 1/year

16 BOD incubator Biobase China 1/year

17 Protein Tester Protein Determinator KDN China 1/year

18 Atomic absorption spectrometer Analytic Jena Germany 1/year

19 Gas chromatograph Bruker USA 1/year

20 Radiometer UMF 2000 Russia 1/year



2.3.1. Noise monitoring

Using sound level meter TESTO 815, Germany. This equipment is adjusted before measuring. Noise sample take method: Noise is measured at site accordance to frequency

shown at table 1

National regulation QCVN 26:2010/BTNMT applied for noise level control

Table 4: Maximum limited value for noise at public and habitant areas

Unit: dBA

No Areas

Time

6 - 21h 21 - 6h

1 Special area 55 45

2 Normal area 70 55

2.3.2. Vibration monitoring

- Using vibration level meter model 200M, USA. This equipment is adjusted before

measuring.

- Vibration sample take method: Noise is measured at site accordance to frequency

shown at table 1.

- National regulation QCVN 27:2010/BTNMT applied for vibration level control.

Table 5: Maximum vibration limits in the environment of construction activities

Area Time Limit (m/s2)

Special area 6h - 18h 0.055

18h - 6h Baseline

Normal area 6h - 21h 0.055

21h - 6h Baseline

2.3.3. Air quality monitoring The chosen parameter of air quality monitoring is gas as CO, NO2 and SO2 and used

equipment is sucking out air machine SKC- USA. This equipment is adjusted before measuring.

QCVN 05-2013/BTNMT is used to control Air environment quality.

Equipment is used for micro – climate: TESTO 625 – Germany



Table 6: QCVN 05:2013/BTNMT table

Parameter Unit

QCVN 05:2013/BTNMT

(on the average of 1

hour)

QCVN

05:2013/BTNMT (on

the average of 24 hours)

CxHy mg/m3 5 -

CO mg/m3 30 -

SO2 mg/m3 0.35 0.125

NO2 mg/m3 0.2 0.1

PM10 mg/m3 - 0.15

2.3.4. Surface water quality

The parameter as DO was measure at sample locations by device U52 - Horiba –

Japan. The other parameters as Cr, TSS, Fe, Mn, Cu, Pb, Zn, Hg, Ni, Cd, As, Se taken

sampling, maintained and analysed at laboratory. The sensors were calibrated before

measuring.

Regulation QCVN 08-MT:2015/BTNMT, B2 type is used to control surface water in the project area. 2.4. Analysis method

Excepting noise, vibration and some parameters of surface the below parameters

were taken and analysed as the follows:

Table 7: The analysis method for environmental air quality parameters

No Parameter Analysis and measurement method

1 Hydrocarbon (CxHy) NIOSH Method 1500

2 Carbon monoxide (CO) PPNB03

3 Nitrogen dioxide (NO2) TCVN 6137: 2009

4 Sulphur dioxide (SO2) TCVN 5971:1995

5 PM10 40 CFR Part50 Method Appendix J

Table 8: The analysis method for environmental surface water


1 Temperature SMEWW 2550B:2017

2 Total nitrogen SMEWW 4500-N.C:2017

3 Total phosphor SMEWW 4500-P. B&E:2017

4 Crom SMEWW 3113B:2017

5 DO TCVN 7325:2016

6 TSS SMEWW 2540 D 2017

7 Fe SMEWW 3111B:2017

8 Mn SMEWW 3111B:2017

9 Cu SMEWW 3111C:2017

10 Hg SMEWW 3112B:2017

11 Cd SMEWW 3113B:2017

12 Zn SMEWW3111B:2017



13 Ni SMEWW 3113B:2017

14 As SMEWW3114B:2017

15 Pb SMEWW 3113B:2017

16 Se SMEWW 3114B:2017

17 Total oil SMEWW 5520B:2017

Table 9: The analysis method for environmental soil


1 Pb TCVN6649:2000 + SMEWW 3113B:2017

2 Cd TCVN6649:2000 + SMEWW 3113B:2017

3 Zn TCVN6649:2000 + SMEWW 3113B:2017

4 As TCVN6649:2000 + SMEWW 3111B:2017

5 Hg TCVN6649:2000 + SMEWW 3112B:2017

2.5. Position and sites for taking sample

Monitoring activities of noise, vibration and environmental air quality was meas-

ured at the same positions (detail at item 2.1). And all of monitoring positions is at habit-

ant areas that near construction area (distance from 10 – 20m).

Table 10: Brief description of monitoring site

No Location Code Type of moni-

toring

Coordinates Description

N E

I Air monitoring

1

Area of 555 alley, Kim Ma

street K1

Environmental

impact monitor-

ing

21° 1' 46.511" 105° 48'

35.370"

Spacious area, close

to roads, lots of

vehicles passing by

2

Area of 475 Kim Ma street, near Daewoo intersection

K2

Environmental

impact monitor-

ing

21° 1' 53.269" 1050 49'

23.051"


to roads, lots of ve-

hicles passing by

3 Kim Ma com-munal house

K3

Environmental

impact monitor-

ing

21° 1' 53.379’’ 105° 49'

42.073”



hicles passing by

4

Area of Cat Linh Primary

school, 31A Cat Linh Street,

Dong Da District, Ha Noi

K4

Environmental

impact monitor-

ing

2101’44.464’’ 105049’45.7

98”



hicles passing by



5

Area of Temple of Literature

gate

K5

Environmental

impact monitor-

ing

2101’38.698’’ 105050’6.65

5”



hicles passing by

6

Area of Heart Hospital, Tran

Hung Dao street, Ha Noi

K6

Environmental

impact monitor-

ing

2101’24.514’’ 105050’36.1

67”



hicles passing by

II Water monitoring

1 Surface water

of Thu Le lake NM1

Environmental

impact monitor-

ing

21° 1' 48.316" 105°48'36.6

03"

Slightly turbid water

with some residue

and mild smell

2

Surface water

of Giang Vo

lake

NM2

Environmental

impact monitor-

ing

21° 1' 46.620" 105°49'11.558"


with some residue

and mild smell

3

Surface water

of Van Mieu

lake

NM3

Environmental

impact monitor-

ing

21°01’36.880’’ 105°50’6.001”


with some residue

and mild smell

III Soil Monitoring

1

Soil sample taken at Ramp

area

Đ1

Environmental

impact monitor-

ing

21° 1' 48.612" 105°48'36.0

25"

Dry soil mixed with

small rocks

2

Soil sample taken at Kim Ma station

Đ2

Environmental

impact monitor-

ing

21° 1' 50.400" 105°48'48.6

52"

Dry soil mixed with

small rocks

3

Soil sample taken at Cat Linh station

Đ3

Environmental

impact monitor-

ing

21° 1' 46.602" 105°49'47.0

09"

Dry soil mixed with

small rocks

4

Soil sample taken at Van Mieu station

Đ4

Environmental

impact monitor-

ing

21° 1’38.309’’ 105°50’9.109”

Dry soil mixed with

small rocks

5

Soil sample taken at Ha Noi station/ Mẫu đất

lấy ở khu vực ga Hà Nội

Đ5

Environmental

impact monitor-

ing

21° 1’25.760’’ 105°50’36.002”

Dry soil mixed with

small rocks

The main activities of construction sites during monitoring time are in below table:

Construction Site Activities in day time Activities in day time

Ramp - D-wall excavation - Excavation B18-22, soil disposal

Station 9 - TBM assembling - No activity



Evacuation shaft - Jet grouting for column D3

- Mobilize cement

- Soil disposal

- No activity

Station 10 - Assembly rebar cage No.28

- Pouring concrete for Dwall No.15

- Soil disposal

- Housekeeping

- Casting concrete for external wall

B11(both side)

- Installing formwork for top slab

B8

- Dismantle formwork of top slab

B5

- Chipping construction joint top

slab B6

- Installing formwork of padding

concrete B12(Ls)

Station 11 - No activity - Mobilization subgrade to site for

reinstatement road

Station 12 - Transfer rebar from factory

- Curing protect concrete of top slab N4

- Housekeeping

- Rebar cage fabrication

- Soil disposal

- Drilling for jet grouting



2.6. Conditions of taking samples

Monitoring activities in April 202l carried out on 01,02/04/2021. During monitor-

ing time, conditions of climate and micro-climate are No rain and light wind.

Table 11: Sampling condition

No Code Sampling

date

Sampling

time

Weather

condition

Sampling condi-

tion

Sampling

technician

I Air monitoring

1 K1 01-

02/04/2021 06h00-05h30 No rain

Sampling when the

company operates

normally

Lê Nguyệt Minh

2 K2 01-

02/04/2021 06h00-05h30 No rain

Sampling when the

company operates

normally

Nguyễn Thị Thu Thảo

3 K3 01-

02/04/2021 06h00-05h30 No rain

Sampling when the

company operates

normally

Lê Văn Thành

4 K4 01-

02/04/2021 06h00-05h30 No rain

Sampling when the

company operates

normally

Bùi Chí Công

5 K5 01-

02/04/2021 06h00-05h30 No rain

Sampling when the

company operates

normally

Nguyễn Cảnh Thạch

6 K6 01-

02/04/2021 06h00-05h30 No rain

Sampling when the

company operates

normally

Nguyễn Hồng Hạnh

II Surface water monitoring

1 NM1.1 01/04/2021 10h50 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

2 NM1.2 01/04/2021 11h00 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

3 NM2.1 01/04/2021 15h00 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

4 NM2.2 01/04/2021 15h10 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

5 NM3.1 01/04/2021 14h20 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương



6 NM3.2 01/04/2021 14h30 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

III Soil Monitoring

1 Đ1 01/04/2021 7h35 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

2 Đ2 01/04/2021 8h05 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

3 Đ3 01/04/2021 08h35 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

4 Đ4 01/04/2021 08h55 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

5 Đ5 01/04/2021 09h05 No rain

Sampling when the

company operates

normally

Nguyễn Nam

Phương

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