2.1
The Project ‘HATS Stage 2A - Upgrading works at Stonecutters Island
Treatment Works – Main Pumping Station, Sedimentation Tanks and Ancillary
Facilities’ under Contract No: DC/2009/10 mainly comprises the construction of a
large underground pumping station with an internal diameter of 55 metres and a
depth of more than 40 metres, the provision of additional double-tray
sedimentation tanks, a new computer control system, the expansion and
modification of existing installations of the SCISTW as well as the construction
of other ancillary facilities. The general location plan of the Project is shown in Figure 1.
2.2
The Project is under Harbour Area Treatment Scheme
(HATS) Stage 2A and is a designated project with Register No. : AEIAR-121/2008. The current works under the Project
and other Contracts at SCISTW for HATS 2A are covered by the same Environmental
Permit (Permit No. EP-322/2008/G), which was issued on 9th May 2014 by the
Environmental Protection Department (hereinafter called EPD) to the
Drainage Services Department (hereinafter called the DSD) as the Permit Holder.
2.3
Sun Fook Kong -Biwater Joint Venture (hereafter called the SBJV) was commissioned
by the DSD to undertake the construction of the Contract No. DC/2009/10 “HATS
2A –Upgrading works at Stonecutters Island Treatment Works – Main Pumping,
Sedimentation Tanks and Ancillary Facilities”. The commencement date
of the Project's construction was 24th February 2011.
2.4
As
part of the planned construction programme, a 2-weeks duration of temporary
sewage bypass is required for the construction of the interconnection between
the two main pumping stations at SCISTW and other modification works to the
pumping stations, which are targeted to take place during the non-bathing
season(November to February) between the years 2015/16 or 2016/17. During this
period the effluent will be bypassed via the HATS Stage 1 PTWs to facilitate
these construction works under Contract No. DC/2009/10.
2.5
Baseline water quality monitoring was conducted on 22 November 2014, 13 December 2014 and 24 January
2015, once per
month for three consecutive months at all selected monitoring stations prior to
the commencement of temporary sewage bypass construction work mentioned in Sections
2.3 and 2.4.
2.6
The purpose of this
Baseline Water Quality Monitoring Report is to establish the baseline
conditions for various water quality parameters in the vicinity of the project
site. These baseline levels will be used as the basis for the impact and post-impact
monitoring. This report presents the monitoring locations, equipment, period,
methodology, results and observations for the water quality measurements during
the baseline period.