The Drainage Services Department appear in February this year that backup and aliment works would be agitated out from aboriginal this year to aboriginal 2020 for the electrical and automated accessories at the Stonecutters Island Carrion Analysis Works (SCISTW). The works accommodate the backup of two ample basin penstocks at the Capital Pumping Base No. 1 installed abysmal underground that accept been operating for over 16 years. It has been appear that the basin penstocks charge to be replaced due to corrosion, and during the works aeon back the pumping base anxious needs to be closed, about 930 000 cubic metres (equivalent to 370 accepted pond pools) of preliminarily treated/screened arising will be absolved into the Victoria Harbour anniversary day. Regarding the appulse of carrion analysis on the affection of baptize bodies in Hong Kong, will the Government acquaint this Council:
(1) of the estimated amount for the aloft backup of basin penstocks; the added carrion analysis works (STWs) currently application basin penstocks of the aforementioned model; and whether it has consistently monitored the bane bearings of those basin penstocks; if so, of the details; if not, the affidavit for that; (2) of the afterward advice in annual of anniversary STW: (i) the year of commissioning, (ii) the boilerplate aggregate of carrion advised per day, (iii) the boilerplate aggregate of advised arising absolved per day, (iv) the baptize ascendancy area (WCZ) into which the advised arising is discharged, and (v) the name(s) of the beach(es) in the vicinity, with the locations of the assorted STWs, their outfalls and adjacent beaches apparent on a map;
(3) of the corresponding Baptize Affection Objectives (WQO) acquiescence ante of the baptize bodies in anniversary WCZ in agreement of absolute asleep nitrogen, unionised ammonia nitrogen, E. coli bacteria, etc., in anniversary of the accomplished bristles years (set out in a table);
(4) of the corresponding WQO acquiescence ante of the baptize bodies in the assorted gazetted beaches in the about of anniversary STW in agreement of attenuated oxygen, E. coli bacteria, turbidity, etc., in anniversary of the accomplished bristles years (set out in a table);
(5) in annual of the incidents in the accomplished bristles years in which STWs absolved arising not accepting gone through the accustomed analysis procedure, of the afterward capacity of anniversary incident: (i) the name of the STW concerned, (ii) the date on which the adventure happened and (iii) the cardinal of canicule the adventure lasted, (iv) the cause(s) of the incident, and, during the incident, (v) the level(s) of analysis which the absolved arising had undergone, (vi) the boilerplate aggregate of carrion advised per day and (vii) the aggregate of arising absolved per day (set out in a table); and
(6) whether it has adjourned the impacts of the incidents mentioned in (5) on the affection of baptize bodies in the vicinity, and whether it has monitored the accordant bearings and adopted acknowledgment measures; if so, of the details; if not, the affidavit for that?
(1) The aliment works agitated out by the Drainage Services Department (DSD) from February 20 to March 4, 2018 mainly complex the aboriginal date of backup of two ample penstocks, which were amid at 34 metres beneath arena akin central the Capital Pumping Base No.1 (MPS1) of the Stonecutters Island Carrion Analysis Works (SCISTW). According to the accepted estimate, the works would amount about $70 million. As these two penstocks were anchored at a altered area at the exoteric allotment of the MPS1 area the abysmal carrion tunnels of the Harbour Area Analysis Scheme (HATS) were affiliated to the SCISTW and demography into annual assurance consideration, it was all-important to backpack out the acting bypass of carrion at some of the upstream Preliminary Analysis Works and abandoned MPS1 of carrion afore technicians may access to backpack out the works.
The DSD has been accouterment appropriate analysis and aliment to its facilities, including the acutely amid penstocks. The penstocks that crave backup has been in operation back 2001. Afterwards operating continuously for over 16 years, the accepted altitude of the capital bodies of the penstock gates are about satisfactory, but their action is afflicted by the acerbic and bane occurred about the edges that are in acquaintance with the penstock frames and acknowledging facilities. The all-embracing altitude of these penstocks account with the continuance of their operation and they are now due for replacement.
The bearings of the penstocks at SCISTW that crave backup is rather unique. The added DSD’s carrion analysis works (STWs) do not accept agnate acutely amid penstocks.
(2) The capacity of the aloft STWs in Hong Kong are apparent in Annex 1.
(3) The acquiescence ante of the key abyssal Baptize Affection Objectives (WQOs) parameters, including attenuated oxygen (DO), absolute asleep nitrogen (TIN), unionised ammonia (UIA) and E. coli, for the 10 Baptize Ascendancy Zones in the accomplished bristles years (2013 to 2017) are listed in Annex 2.
(4) All gazetted beaches in Hong Kong accept absolutely complied with the WQO constant of E. coli for the accomplished bristles years. There is no accordant WQO on DO and turbidity for bathing beaches.
(5) The capacity of the incidents involving the acquittal of carrion that was not absolutely advised due to operational or engineering problems of STWs in the aftermost bristles years are apparent in Annex 3.
(6) The adventure occurring on August 25, 2014 at Tuen Mun Pillar Point Carrion Analysis Works complex the automated abortion of the bulb equipment. During the incident, about 95 000 cubic metres of basic carrion was absolved through the emergency abysmal outfall. As a basic measure, the Leisure and Cultural Services Department (LCSD) briefly bankrupt 14 beaches in Tsuen Wan and Tuen Mun districts in the black on that day. The Environmental Protection Department additionally calm baptize samples at these beaches in the morning and afternoon of the afterward day, and accepted that the baptize affection at all the 14 beaches was acceptable for swimming. The LCSD afterwards re-opened all the beaches concerned.
Besides, three incidents occurred in the North West Kowloon Preliminary Analysis Works, Tai Po Carrion Analysis Works and Ma Wan Carrion Analysis Works in 2017. They were mainly due to accessory malfunction of the bulb accessories and electricity accumulation botheration of the ability company. Due to the abbreviate continuance of these incidents and baby aggregate of carrion discharged, the appulse acquired to the baptize affection adjacent was baby and the problems were apace dealt with.
The backup of penstocks for SCISTW from February 20 to March 4, 2018 had apprenticed the acting bypass of carrion as explained in (1) above. All-embracing speaking, 55 per cent of the absolute aggregate of HATS breeze was bypassed, while the absolute 45 per cent was conveyed by Capital Pumping Base No.2 and added arrangement as accepted to SCISTW for able analysis and disposal.
When planning for the aliment works, the DSD had active consultants to conduct abundant baptize affection appulse assessment. The appraisal adumbrated that the abeyant appulse on baptize affection of Victoria Harbour would be slight and transient. And baptize affection would resume to accustomed bound in a few canicule afterwards the abeyance of bypass.
Notwithstanding that, in adjustment to minimise the abeyant appulse of the bypass to the ambiance and the public, the Government has agitated out abundant appraisal and basic assignment at the outset, formulated and implemented accident affairs as able-bodied as assorted acknowledgment measures (including agency to enhance the concoction and burning of the carrion discharged, accession of odour suppressants and accession of deodorisation units). Furthermore, the aliment works were conducted during the non-bathing division to minimise abeyant appulse to the public.
During the bypass, all accordant government departments collaborated carefully to adviser the situation. The DSD had conducted absolute baptize affection ecology at 47 ecology sites, including beaches, angle ability zones, apricot sites, promenades and draft shelters. The ecology after-effects adumbrated that the baptize affection was about in band with the consultant’s predictions. All-embracing speaking, the absolute levels of baptize affection impacts of the bypass were hardly lower than the predictions and, as expected, the baptize affection of altered genitalia of Victoria Harbour resumed to accustomed aural one to several canicule afterwards the abeyance of bypass.
Ends/Wednesday, April 25, 2018 Issued at HKT 14:45
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