1
INTRODUCTION
1.1.1
The existing Yuen Long Sewage Treatment Works (YLSTW) is a secondary
sewage treatment works, located at Yuen Long Industrial Estate serves Yuen Long
Town, Yuen Long Industrial Estate and Kam Tin areas with a design capacity of
70,000 m³ per day. Based on the latest planning data, the volume of sewage
generation from the YLSTW catchment is estimated to increase to 150,000 m³ per
day after 20 years. In addition, since YLSTW has been operating for over 30
years and most of its facilities are of out-dated design and reaching the end
of their design life, the environmental facilities of the plant will also be
upgraded and hence improving the adjacent environment through upgrading the
YLSTW to Yuen Long Effluent Polishing Plant (YLEPP). The Location of Proposed
Yuen Long Effluent Polishing Plant is given in Figure 1.
1.1.2
YLSTW will be reconstructed in two stages to increase its capacity to
150,000 m³ per day. The proposed works, as Stage 1 of the project, will firstly
increase the treatment capacity to 100,000 m³ per day. In the course of Stage 1
construction, about half of the existing facilities of YLSTW would be
demolished, while the other half would be kept in operation to maintain the
sewage treatment service for Yuen Long area. This 72-month works contract
commenced on 9 November 2020. Demolition of existing YLSTW for construction of
new treatment facilities are in progress.
1.1.3
The Project is a designated project under Schedule 2 of the
Environmental Impact Assessment Ordinance (EIAO) (Cap. 499) for which
Environmental Impact Assessment (EIA) report and Environmental Monitoring and
Audit (EM&A) Manual was approved by EPD (Register No.: AEIAR-220/2019) on
25 April 2019. The Environmental Permit (EP) (EP No. EP-565/2019) was issued by
EPD on 26 April 2019.
1.1.4
Fugro Technical Services Limited was appointed as the Environmental Team
(ET) by Drainage Services Department (DSD) to undertake the Environmental Team
services for the Project and implement the EM&A works under the Contract
No. DC/2019/10 Yuen Long Effluent Polishing Plant -Main Works for Stage 1
(hereinafter referred as the Contract) for the period from July 2020 to 6 July
2023.
1.1.5
Aurecon Hong Kong Limited (Aurecon) has been appointed as the
Environmental Team (ET) by Drainage Services Department (DSD) to undertake the
Environmental Team services for the Project and implement the EM&A works
under the Contract from July 2023. Air quality, noise, water quality and
ecological monitoring, site inspections and auditing (as scheduled) under
EM&A programme with effect from 7 July 2023 was conducted by Aurecon. Aurecon is
undertaking the preparation (including reporting of monitoring results),
certification by ET Leader and submission of this report to EPD.
1.1.6
All ET roles and responsibilities under the EP for this Project were
undertaken by Fugro up to 6 July 2023 and by Aurecon with effect from 7 July
2023. Air quality, noise, water quality and ecological monitoring, site
inspections and auditing (as scheduled) under EM&A programme up to 6 July
2023 was conducted by Fugro, and the corresponding monitoring results were
shared with Aurecon for the purposes of reporting in this report.
1.1.7
This is the 28th Monthly EM&A report to document the
findings of site inspection activities and EM&A programme for this project
from 1 July 2023 to 31 July 2023 (reporting period) and is submitted to fulfil
Condition 3.4 of the EP and Section 12.4.1 of the EM&A Manual. According to
Condition 4 of the EP, electronic reporting is provided on the internet website
to facilitate public inspection of the report.
1.2.1
The Project Organization structure is shown in Appendix B. The key personnel contact names and numbers are summarized in Table 1.
1.3
Construction Programme and Activities
1.3.1
The construction programme
of this project is shown in Appendix A.
1.4
Works undertaken during the month
1.4.1
The main construction works carried out in the reporting period were as
follow:
Ground investigation at SDB & TTS
Laying cable ducts and construction of cable draw pits near entrance of
YLSTW
ABWF and E&M works at CLP substation
ELS works and RC structure works at IW & PST
Installation of 813mm pipe pile at North of AGS
Installation of King Post at AGS
Breaking and removal of RAS (below ground)
Installation of observation wells and dewatering well at AGS
Demolition of Mixed Liquor Distribution & sludge Draw-off Chamber at
FST no. 5-8
Installation of sheet pile at TTS
Installation of King post at TTS
Installation of observation wells and dewatering well at TTS
Installation of sheet pile at STB
Demolition of underground structure at pump room of AFT
Installation of sheet pile at UC5
ELS works at UC5
Sheet piling installation around Sludge digester no. 1 3
Installation of sheet pile at Biogas Holder no. 1
Construction of temporary 200m3 sludge holding tanks, and
1.4.2
The environmental mitigation measures corresponding to the main
construction works implemented in the
reporting period can be referred to Appendix
J.
1.5
Status of Environmental Licences, Notification and
Permits
1.5.1
A summary of the status of the relevant permits, licenses and/or notifications
on environmental protection for this project is presented in Table 2.