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 (FTS) 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 No.
DC/2019/10 Yuen Long Effluent Polishing Plant -Main Works for Stage 1 (hereinafter
referred as “the Contract”).
1.1.5
This is the 16th Monthly EM&A report to
document the findings of site inspection activities and EM&A programme for
this project from 1 July 2022 to 31 July 2022 (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.
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:
·
Piling
work at STB;
·
ELS works at IW & PST;
·
Zone 3
Diversion works:
a.
Temp. Gravity thickening tank – Pipe laying and E&M
installation work;
b.
Temp. Sludge Holding Tank – Pipe laying and E&M
installation work;
c.
Temp. Water heater house – Pipe laying and E&M
installation work;
d.
Temp. Primary Sludge Pumping Station – RC work;
e.
Temp. Digested sludge pump / Supernatant Pumping – RC Work;
f.
Digested Sludge Pumping Station house – Pipe laying and
E&M installation work;
g.
Pipe laying for Zone 3 diversion;
·
Demolition of Sludge Holding Tank no. 1;
·
Backfilling work at Sludge Holding Tank no. 3 & 4;
·
Superstructure works at CLP substation;
·
Installation
of MIC unit at MIC office;
·
Backfill work at A. Tank 6-8;
·
Construction of RC chamber at Zone 2B;
·
Disposal of Pond Sediment excavated from PST; and
·
Disposal
of construction waste as indicated in Appendix
I.
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 1.2.