UPDATE: 14 December 2020
different building – new vertical cluster
A residential building called Kwai Tung House in the Tung Tau Estate, Nga Tsin Wai is reported to have nine cases in six different units, where most of the patients come from flat number 15 (on different floors). CHP said maybe a structural problem (meaning drainage system) Dr Yuen will investigate.
UPDATE 11 December 2020
Environmental samples were taken from Block 6 apartments, COVID19 positive results were discovered on the piping, floor drains, and exhaust fans
Logically, it appears that COVID19 entered through the floor drain trap into the space (bathroom?) exposing the residents to the COVID19 virus.
The positive results discovered on the exhaust fans is a new development. Perhaps the exhaust fan handling contaminated air with suspended droplets itself becomes contaminated, and potentially discharges contaminated air. And when the extract fan is switched off, its a contaminated surface, risking touch/contact transmission. Safety precautions are needed for handling and cleaning exhaust fans.
RTHK has now issued a news report with video (ENGLISH): https://news.rthk.hk/rthk/en/component/k2/1564832-20201211.htm
Dr Chuang Shuk-kwan (11-12-2020) mentioned in passing that earlier investigations also found COVID19 in the fan system, although I don’t recall any announcement.
#exhaustfan #ventilation #HVAC
10 December 2020
Richland Gardens is a residential housing estate located in Kowloon Bay, Hong Kong comprising 22 high rise tower blocks, a small outdoor public transport interchange, and a medium sized shopping centre.
RTHK and SCMP have reported seven covid19 cases so far, located on different floors of the same tower, all in Block 6, and all residing in flat D. In addition, one case was reported in Block 4, and one case in Block 18.
CHP requires all residents in Richland Gardens Block 6, all floors, flat D, and Block 18, all floors , Flat E, must be tested, to me that indicates potentially more cases in Block 18 will emerge in the next few days.
After the horse has bolted, experts turned up to visit the Block 6 with microbiologist Dr Yuen, after the inspection Dr Yuen stated the drainage could be the source, because all the cases were in flat D, on different floors, but not every U trap could be seen (no access?)
RTHK managed to interview several Block 6 residents, who stated that the Block 6 drainage system was leaking!
Strange that BD, EPD or Dr Yuen didn’t mention leakage that in their post-inspection press conference. Dr Yuen did suggest pointed out that all residents in Block 6 should be quarantined, but the quarantine accommodation is already full, another no room at the inn story ✨✨✨
From bitter experience (e.g. SARS 2003) and other buildings, we know that sub-standard drainage systems can spread disease in the same high rise building, for Richland Gardens the early evidence tends to indicate that the cause is probably the poorly maintained drainage system (again). Has nobody heard that Prevention is better than the cure!
As shown in previously posted photos, it is easy to find located drainage systems that have not been properly maintained, but we have to wait for the next batch of people to be hospitalised before BD, EPD and HA pay a site visit.
Fingers crossed this cluster does not expand across the other 22 tower blocks in the estate.
#drainage #sewerage #conditionsurvey #buildings #kowloonbay #plumbing #buildingmanagement #plumbinginstallation #floordrains