Revision History

Rev.

Description of Modification

Date

 

1.

 

First Issue for Comments

 

21/07/2023

 

2.

 

Second Issue for Comments

 

27/07/2023

 

 

 

 

 

CONTENTS

Executive Summary......................................................................................................................... 1

Basic Project Information.......................................................................................................... 6

Noise....................................................................................................................................... 11

Water Quality.......................................................................................................................... 15

Waste...................................................................................................................................... 19

Landfill Gas Monitoring........................................................................................................... 22

Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions 25

EM&A Site Inspection.............................................................................................................. 27

Conclusions and Recommendations........................................................................................ 28

 

 

Appendix A             Master Programme

 

Appendix B             Overview of Desalination Plant in Tseung Kwan O

 

Appendix C             Summary of Implementation Status of Environmental Mitigation

Appendix D             Water Quality Monitoring Graphical Presentation

Appendix E             Summary of Exceedances Appendix F             Waste Flow Table

Appendix G             Complaint Log

 

Appendix H            Event/Action Plan for Water Quality Monitoring

Appendix I              Event/Action Plan for Construction Noise Exceedance

 

 

 

 

 

Executive Summary

 

Introduction

 

A1. The Project, Design, Build and Operate First Stage of Tseung Kwan O Desalination Plant (TKODP), is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is currently governed by a Further Environmental Permit (EP No. FEP - 01/503/2015/A) for the construction and operation of the Contract.

 

A2. In accordance with the Environmental Monitoring and Audit (EM&A) Manual for the Contract, EM&A works for marine water quality, noise, waste management and ecology should be carried out by Environmental Team (ET), Acuity Sustainability Consulting Limited (ASCL), during the construction phase of the Contract.

 

A3.  This is the 12th Quarterly EM&A Report, prepared by ASCL, for the Contract summarizing the monitoring results and audit findings of the EM&A programme at and around Tseung Kwan O Area 137 (TKO 137) during the reporting period from 1 December 2022 to 28 February 2023.

 

A4. The EM&A programme for this contract has covered environmental monitoring on construction noise level at selected NSRs and Contractor’s environmental performance auditing in the aspects of construction dust, construction noise, water quality, waste management, Landscape and Visual and Ecology.

 

Summary of Main Works Undertaken & Key Mitigation Measures Implemented

 

A5.      Key activities carried out in this reporting period for the Project included the followings:

Administration Building

-              Installation of Aluminium Window, curtain wall, balustrade, the subframe of glass wall, Aluminium Louvre, tiling works, timber door subframe

-              Construction of interior finishes at 2/F, 3/F, and 4/F and staircase at 1st floor

-              Floor finishes at 1/F open area and Roof

-              Erection of block wall

-              Installation of building services, lifting and electrical switchboard

Chemical building

-              installation of louvre

-              Underground utility construction work

-              Installation of building services and mechanical equipment

Main Electrical & Central Chiller Plant Building

-              Construction of Check Water Meter Cabinet and Plinths for Genset

-              Installation metal and timber Doors

-              Installation of chillers, building services, electrical switchboard

ActiDAFF

-              Metal railing installation


 

-              R/F tile laying works

-              Underground utility construction work

-              Erection and dismantling of scaffolding, installation of mechanical equipment and piping, bubble test

Product Water Storage Tank Building

-              tile laying works

-              Installation of Design for Manufacturing and Assembly on East & West Sides

-              Resin Injection work & Water Test for 4 Water Tanks

-              Installation of Cat Ladders in Water Tanks

-              Underground utility construction work

-              Installation of building services, mechanical equipment and steel pipe

OSCG Building

-              Installation of Design for Manufacturing and Assembly Panel

-              Resin Injection work & water test for Brine Tank

-              Construction of external staircases

-              Underground utility construction work

-              Installation of building services and mechanical equipment, lifting of tanks

Reverse Osmosis Building

-              Installation of Design for Manufacturing and Assembly Panels at East & West Sides

-              Installation of window, hand railings and Louvres

-              Construction of Staircases

-              Underground utility construction

-              Installation of building services, electrical switchboard, mechanical equipment, steel pipe and Glass Reinforced Plastics (GRP) pipe

Post Treatment Building

-              installation of louvre

-              Installation of Design for Manufacturing and Assembly Panels

-              Underground utility construction

Inspection corridor

-              Formwork Erection and Steel fixing works for segments 1‐7

-              construction of stair tower No. 1

CO2 Tanks

-              Installation of pipes

Outfall Shaft

-              Rock material backfill

Intake shaft

-              Shafts backfill rock and excavation and lateral support (ELS) removal

Combined Shaft

-              Installation of louvre and window

-              Underground utility construction


 

-              Staircases and internal finishing, puddle pipe installation, stoplog wall construction

-              Water proving works

-              Installation of mechanical equipment and pipes, stoplogs and band screens

Pump room

-              internal finishing, water proving; E&M installation

Elevated Walkway

-              Lift shaft construction

Slope works

-              Excavation at slope toe and access erection, soil anchor and grouting construction

Other

-              132 kV temporary emergency vehicular access (eva) Construction

-              Permanent road construction at Zone A, B, C

-              Construction of parapet on top slab of backwash tank

 

A6.  The major environmental impacts brought by the above construction works include:

-     Construction dust and noise generation from marine construction works, excavation works, excavation works, construction works, rock cutting works and pipe pilling driving works;

-     Waste generation from the construction activities

-     Impact on water quality from marine construction works and inland construction works

 

A7. The key environmental mitigation measures implemented for the Project in this reporting period associated with the above construction works include:

-     Dust suppression by regular wetting and water spraying for construction works;

-     Reduction of noise from equipment and machinery on-site and regularly inspection to machinery and plants/vehicles on-site to ensure proper functioning;

-     Sorting and storage of general refuse and construction waste; and

-     Deployment of temporary silt curtain in the area where marine construction works were conducted and deployment of water sedimentation tanks for treatment of wastewater at inland areas before discharge


 

Summary of Exceedance & Investigation & Follow-up

 

A8.  No noise monitoring was conducted during the reporting period since there are no project- related construction activities undertaken within a radius of 300m from the monitoring locations. No exceedance of the Action Level was recorded during the reporting period.

 

A9. The EM&A works for water quality were conducted during the reporting period in accordance with the EM&A Manual.

 

A10. Water quality monitoring was conducted as scheduled in the reporting period. Two hundred and fourteen (214) action level exceedances and one hundred and sixty-seven (167) limit level exceedances for suspended solids (SS) of impact water quality monitoring were recorded in the reporting period. All action and limit level exceedances were concluded non- project related.

 

A11. In this reporting period, 120 times of landfill gas monitoring were recorded at Wan Po Road (Ch700- Ch800). No action and limit level exceedance for methane, oxygen and carbon dioxide was recorded.

 

A12. Weekly site inspections of the construction works were also carried out by ET to audit the mitigation measures implementation status. Thirteen (13) times of weekly Joint site inspections were carried out by ET and IEC.

 

A13.  A summary of the EM&A activities in this reporting period is listed in Table I and summary of the environmental exceedance of the reporting period is tabulated in Table II.

 

Table I             Summary Table for EM&A Activities in the Reporting Period

EM&A Activities

Dec 2022

Jan 2023

Feb 2023

Noise Monitoring

N/A

N/A

N/A

 

Water Quality Monitoring

1, 3, 6, 8, 10, 12, 15,

17, 20, 22, 24, 27, 29

and    31    December

2022

3, 5, 7, 10, 12, 14, 17,

19, 21, 27 and 31

January 2023

2, 4, 6, 8, 10, 13, 15,

17, 21, 23, 25 and 28

February 2023.

 

Landfill Gas monitoring

6, 7, 8, 9, 10, 12, 13,

14, 15, 16, 17, 19, 20,

21, 22 ,23, 24, 28, 29,

30 and 31 December

2023

5, 6, 7, 9, 10, 11, 12,

13, 14, 16, 17, 18, 19,

20, 21 January 2023

1, 2, 3, 4, 6, 7, 8, 9, 10,

11, 13, 14, 15, 16, 17,

18, 20, 21, 22, 23, 24,

25,     27     and     28

February 2023

Environmental Site Inspection

6,  13,  22  and  29

December 2022

3, 10, 17, 27 and 31

January 2023

7,  15,  21  and  28

February 2023


 

Table II           Summary Table for Exceedance in the Reporting Period

 

Environmental Monitoring

 

Parameter

No. of non- Project

related exceedance

Total No. of non-Project related exceedance

No. of Project

related exceedance

Total No. of Project related exceedance

AL

LL

AL

LL

Noise

Leq (30min)

N/A

N/A

N/A

N/A

N/A

N/A

 

 

Water

DO

0

0

0

0

0

0

Turbidity

0

0

0

0

0

0

SS

214

167

381

0

0

0

pH

0

0

0

0

0

0

Salinity

0

0

0

0

0

0

 

Landfill Gas

O2

0

0

0

0

0

0

CH4

0

0

0

0

0

0

CO2

0

0

0

0

0

0

 

Complaint Handling and Prosecution

 

A14. No environmental complaint, notifications of summons or prosecution was received during the reporting period.

 

Reporting Change

 

A15.    There was no change to be reported that may affect the on-going EM&A programme.


 

Basic Project Information

 

1.1.      Background

The Acciona Agua, S.A. Trading, Jardine Engineering Corporation Limited and China State Construction Engineering (Hong Kong) Limited and as AJC Joint Venture (AJCJV) is contracted to carry out the Design, Build and Operate First Stage of Tseung Kwan O Desalination Plant (DPTKO) under Contract No. 13/WSD/17 (the Contract).

Acuity Sustainability Consulting Limited (ASCL) is commissioned by AJCJV to undertake the Environmental Team (ET) services as required and/or implied, both explicitly and implicitly, in the Environmental Permit (EP), Environmental Impact Assessment Report (EIA Report) (Register No. AEIAR-192/2015) and Environmental Monitoring and Audit Manual (EM&A Manual) for the Contract; and to carry out the Environmental Monitoring and Audit (EM&A) programme in fulfillment of the EIA Report’s EM&A requirements and Contract No. 13/WSD/17 Specification requirements.

Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Environmental Permit (No. EP-01/503/2015) and Variation of Environmental Permit (No. EP-01/503/2015/A) to Water Supplies Department (WSD); and granted the Further Environmental Permit (No. FEP-01/503/2015/A) to AJCJV for the Contract.

1.2.      The Reporting Scope

This is the 12th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 December 2022 to 28 February 2023.

 

1.3.      Project Organization

The Project Organization structure for Construction Phase is presented in Figure 1.1.

 


Figure 1.1       Project Organization Chart


 

Contact details of the key personnel are presented in Table 1.1 below:

 

Table 1.1        Contact Details of Key Personnel

 

 

Party

 

Position

 

Name

Telephone no.

Project Proponent

SE/CM2

Benny Lam

2634-3573

 

Supervising Officer (Binnies Hong Kong Limited)

Project Manager

Christina Ko

2608-7302

Chief Resident Engineer

 

Roger Wu

 

6343-1002

The Jardine Engineering Corporation, Limited, China State Construction Engineering (Hong Kong) Limited and Acciona Agua,

S.A. Trading

Project Manager

Stephen Yeung

2807-4665

 

Environmental Monitoring Manager

 

Brian Kam

 

9456-9541

Acuity Sustainability Consulting Limited

Environmental Team Leader

 

Jacky Leung

 

2698-6833

 

ANewR Consulting Limited

Independent Environmental Checker (IEC)

 

Louis Kwan

 

2618-2831

 

1.4.      Summary of Construction Works

Details of the major construction activities undertaken in this reporting period are shown as below. The construction programme is presented in Appendix A.

 

Administration Building

-              Installation of Aluminium Window, curtain wall, balustrade, the subframe of glass wall, Aluminium Louvre, tiling works, timber door subframe

-              Construction of interior finishes at 2/F, 3/F, and 4/F and staircase at 1st floor

-              Floor finishes at 1/F open area and Roof

-              Erection of block wall

-              Installation of building services, lifting and electrical switchboard

Chemical building

-              installation of louvre

-              Underground utility construction work

-              Installation of building services and mechanical equipment

Main Electrical & Central Chiller Plant Building

-              Construction of Check Water Meter Cabinet and Plinths for Genset

-              Installation metal and timber Doors

-              Installation of chillers, building services, electrical switchboard


 

ActiDAFF

-              Metal railing installation

-              R/F tile laying works

-              Underground utility construction work

-              Erection and dismantling of scaffolding, installation of mechanical equipment and piping, bubble test

Product Water Storage Tank Building

-              tile laying works

-              Installation of Design for Manufacturing and Assembly on East & West Sides

-              Resin Injection work & Water Test for 4 Water Tanks

-              Installation of Cat Ladders in Water Tanks

-              Underground utility construction work

-              Installation of building services, mechanical equipment and steel pipe

OSCG Building

-              Installation of Design for Manufacturing and Assembly Panel

-              Resin Injection work & water test for Brine Tank

-              Construction of external staircases

-              Underground utility construction work

-              Installation of building services and mechanical equipment, lifting of tanks

Reverse Osmosis Building

-              Installation of Design for Manufacturing and Assembly Panels at East & West Sides

-              Installation of window, hand railings and Louvres

-              Construction of Staircases

-              Underground utility construction

-              Installation of building services, electrical switchboard, mechanical equipment, steel pipe and Glass Reinforced Plastics (GRP) pipe

Post Treatment Building

-              installation of louvre

-              Installation of Design for Manufacturing and Assembly Panels

-              Underground utility construction

Inspection corridor

-              Formwork Erection and Steel fixing works for segments 1‐7

-              construction of stair tower No. 1

CO2 Tanks

-              Installation of pipes

Outfall Shaft

-              Rock material backfill

Intake shaft

-              Shafts backfill rock and excavation and lateral support (ELS) removal

Combined Shaft

-              Installation of louvre and window


 

-              Underground utility construction

-              Staircases and internal finishing, puddle pipe installation, stoplog wall construction

-              Water proving works

-              Installation of mechanical equipment and pipes, stoplogs and band screens

Pump room

-              internal finishing, water proving; E&M installation

Elevated Walkway

-              Lift shaft construction

Slope works

-              Excavation at slope toe and access erection, soil anchor and grouting construction

Other

-              132 kV temporary emergency vehicular access (eva) Construction

-              Permanent road construction at Zone A, B, C

-              Construction of parapet on top slab of backwash tank

 

 

1.5.      Summary of Environmental Status

A summary of the valid permits, licences, and /or notifications on environmental protection for this Project is presented in Table 1.2.

Table 1.2        Summary of the Status of Valid Environmental Licence, Notification, Permit and Documentations

 

 

Permit/ Licences

Valid Period

 

Status

 

Remark

From

To

Environmental Permit

EP - 503/2015/A

Throughout the Contract

Valid

-

FEP - 01/503/2015/A

Throughout the Contract

Valid

-

Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation (Form NA)

451539

Throughout the Contract

Valid

-

Billing Account for Disposal of Construction Waste

7036276

Throughout the Contract

Valid

-

Chemical Waste Producer Registration

5213-839-A2987-01

Throughout the Contract

Valid

-

Wastewater Discharge Licence (Land and Marine works)

WT00035775-2020

23/08/2021

31/07/2025

Valid

-

Marine Dumping Permits

EP/MD/23-053

07/12/2023

30/03/2023

Valid

-


 

 

Permit/ Licences

Valid Period

 

Status

 

Remark

From

To

Construction Noise Permit

GW-RE0627-22

29/06/2022

21/12/2022

Expired in the reporting period

-

GW-RE1338-22

22/12/2022

21/06/2023

Valid

-

 

The status for all environmental aspects is presented in Table 1.3.

 

Table 1.3   Summary of Status for Key Environmental Aspects under the EM&A Manual

 

Parameters

Status

Water Quality

Baseline Monitoring under EM&A Manual

The baseline water quality monitoring was conducted between 12 May 2020 and 6 June 2020

Impact Monitoring

On-going

Noise

 

Baseline Monitoring

The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD

under EP Condition 3.4

Impact Monitoring

On-going

Waste Management

Mitigation Measures in Waste Management Plan

On-going

Landfill Gas

Regular Monitoring when Construction Works are within the 250m Consultation Zone

In this reporting period, 120 times of landfill gas monitoring were recorded at Wan Po Road (Ch700 - Ch800). No exceedance of action and limit level for

methane, oxygen and carbon dioxide was observed

Environmental Audit

Site Inspection covering Measures of Air Quality, Noise Impact, Water Quality, Waste, Ecological Quality, Fisheries, Landscape and Visual

 

On-going

 

Other than the EM&A work by ET, environmental briefings, trainings and regular environmental management meetings were conducted, in order to enhance environmental awareness and closely monitor the environmental performance of the contractors.

The EM&A programme has been implemented in accordance with the recommendations presented in the approved EIA Report and the EM&A Manual. A summary of implementation status of the environmental mitigation measures for the construction phase of the Project during the reporting period is provided in Appendix C.


 

Noise

 

2.1.      Monitoring Requirements

To ensure no adverse noise impact, construction noise monitoring is recommended to be carried out within 300m radius from the nearby noise sensitive receivers (NSRs), during construction phase. The NSRs selected as monitoring station are (i) NSR4 - Creative Secondary School, (ii) NSR24 - PLK Laws Foundation College, and (iii) NSR31 - School of Continuing and Professional Studies - CUHK respectively.

No impact construction noise monitoring was conducted in the reporting period due to the overly distant monitoring station from the works location, where they were farther than 1 km from the closet monitoring station NSR4 to the works location.

2.2.      Monitoring Parameters, Frequency and Duration

Construction noise level would be measured in terms of the A-weighted equivalent continuous sound pressure level (LAeq). Leq 30min was used as the monitoring parameter for the time period between 0700 and 1900 on normal weekdays. Table 2.1 summarizes the monitoring parameters, frequency and duration of the impact noise monitoring.

Table 2.1   Noise Monitoring Parameters, Time, Frequency and Duration

 

Time

Duration

Interval

Parameters

Daytime: 0700-1900

Day time:

0700-1900

(during normal weekdays)

Continuously in

Leq 5min/Leq 30min (average of 6 consecutive Leq 5min)

Leq 30min

L10 30min & L90 30min

 

2.3.      Monitoring Locations

The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements.

According to the environmental findings detailed in the EIA report and Baseline Monitoring Report, the designated locations for the construction noise monitoring are listed in Table 2.2 below.

Table 2.2   Noise Sensitive Receivers

 

NSR ID

Noise Sensitive Receivers

Monitoring Location

Position

NSR 4

Creative Secondary School

Roof Floor

1 m from facade

NSR 24

PLK Laws Foundation College

Pedestrian Road on Ground Floor

Free-field

NSR 31

School of Continuing and Professional Studies - CUHK

Roof Floor

1 m from facade


 

The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements. Three noise monitoring locations for impact monitoring at the nearby sensitive receivers are shown in Figure 2.1-2.3.

 

 

Figure 2.1 NSR4 Creative Secondary School

 

Figure 2.2 NSR24 PLK Laws Foundation College


 

 

Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK

 

2.4.      Action and Limit Levels

The Action/Limit Levels are in line with the criteria of Practice Note for Professional Persons (ProPECC PN 2/93) “Noise from Construction Activities - Non-statutory Controls” and Technical Memorandum on Environmental Impact Assessment Process issued by HKSAR Environmental Protection Department [“EPD”] under the Environmental Impact Assessment Ordinance, Cap 499, S.16 are presented in Table 2.3.

Table 2.3 Action and Limit Levels for Construction Noise Monitoring per EM&A Manual

 

Time Period

Action Level

Limit Level (dB(A))

0700-1900 on

normal weekdays

When one documented complaint is received from any one of the noise sensitive receivers

-          70 dB(A) for school and

-          65        dB(A)       during examination period

Notes: Limits specified in the GW-TM and IND-TM for construction and operation noise, respectively.

 

If exceedances were found during noise monitoring, the actions in accordance with the Event and Action Plan shall be carried out according to Appendix E.


 

2.5.      Monitoring Results and Observations

 

Referring to EM&A manual Section 4.1.2, the impact noise monitoring should be carried out when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations. No noise monitoring station was located within a radius of 300m of the Project site as shown in Figure 2.4, no impact monitoring for noise impact was conducted in the reporting period.


 

Figure 2.4       Site Layout Plan with Noise Sensitive Receivers and Desalination Plant


 

Water Quality

 

In accordance with the recommendations of the EIA, water quality monitoring is required during dredging for the submarine pipelines and, during operation phase. In addition, baseline water quality monitoring was conducted prior to the commencement of marine construction activities.

The following Section provides details of the water quality monitoring to be undertaken by the Environmental Team (ET) to verify the distance of sediment and brine plume dispersion and to identify whether the potential exists for any indirect impacts to occur to ecological sensitive receivers. The water quality monitoring programme was carried out to allow any deteriorating water quality to be readily detected and timely action taken to rectify the situation.

Water quality monitoring for the Project can be divided into the following stages:

 

-                      Dredging activities during construction phase;

-                      Discharge of effluent from main disinfection during construction phase;

-                      Operation phase - first year upon commissioning; and,

-                      Continuous monitoring of effluent quality.

 

3.1.      Water Quality Parameters

The parameters that have been selected for measurement in situ and in the laboratory are those that were either determined in the EIA to be those with the most potential to be affected by the construction works or are a standard check on water quality conditions. Parameters measured in the impact monitoring are listed in Table 3.1

Table 3.1   Parameters measured in the impact marine water quality monitoring

 

Parameters

Unit

Abbreviation

In-situ measurements

Dissolved oxygen

mg/L

DO

Temperature

oC

-

pH

-

-

Turbidity

NTU

-

Salinity

0/00

-

Laboratory measurements

Suspended Solids

mg/L

SS

 

In addition to the water quality parameters, other relevant data were measured and recorded in Water Quality Monitoring Logs, including the location of the sampling stations, water depth, time, weather conditions, sea conditions, tidal stage, current direction and velocity, special phenomena and work activities undertaken around the monitoring and works area that may influence the monitoring results.


 

3.2.      Monitoring Locations

The impact water quality monitoring locations are detailed in Table 3.2 and shown in Figure 3.1 below.

 

Table 3.2         Location of Impact Water Quality Monitoring Station

 

Station

Easting

Northing

Description

CE

843550

815243

Upstream control station at ebb tide

CF

846843

810193

Upstream control station at flood tide

WSR1

846864

812014

Ecological sensitive receiver at Tung Lung Chau

WSR2

847645

812993

Fisheries sensitive receiver at Tung Lung Chau

WSR3

848023

813262

Ecological sensitive receiver at Tung Lung Chau

WSR4

847886

814154

Ecological sensitive receiver at Tai Miu Wan

WSR16

845039

815287

Ecological sensitive receiver at Fat Tong Chau

WSR33

847159

814488

Ecological sensitive receiver at Tai Miu Wan

WSR36

846878

814081

Ecological sensitive receiver at Kwun Tsai

WSR37

846655

813810

Ecological sensitive receiver at Tit Cham Chau

NF1

846542

813614

Edge of mixing zone, ~ 200m west of outfall diffuser

NF2

846942

813614

Edge of mixing zone, ~ 200m east of outfall diffuser

NF3

846742

813414

Edge of mixing zone, ~ 200m south of outfall diffuser

 


 

Figure 3.1       Impact Water Quality Monitoring Locations under EM&A Manual


 

3.3.      Monitoring Equipment, Methodology and QA/QC Procedures

The monitoring methodology, equipment used, and QA/QC procedures could be referred to Section 3.1.2 -3.1.4, 3.1.6-3.1.7 and 3.2 of the Monthly EM&A Report.

3.4.      Action and Limit levels

The Action and Limit Levels have been set based on the derivation criteria specified in the EM&A Manual and based on the baseline water quality monitoring data and the derivation criteria, the Action/Limit Levels have been derived and are presented in Table 3.3.

Table 3.3    Derived Action and Limit Levels for Water Quality

 

Parameters

Action

Limit

Construction Phase Impact Monitoring

DO in mg/L

Surface and Middle