covid in the same tower block

by John Herbert

Tower block at Richland Gardens Estate ,Kowloon Bay,Hong Kong 13-12-2020
COVID Vertical spread at Richland Gardens Estate, Block 6, Kowloon Bay,

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.

https://news.rthk.hk/rthk/en/component/k2/1564579-20201210.htm

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

Building Drainage Systems and COVID19

In the good old days the topic was called Public Health, nowadays its called Plumbing and Drainage. It is essential for all buildings to have properly designed, installed and maintained sewerage systems to prevent infecting occupants, whether it is 2003 SARS, 2020 COVID19, or Influenza.

youtube is unreliable here is the link: https://www.youtube.com/watch?v=Uv38qdl4Z1M

Recently, when COVID19 infection was discovered spreading within Hong Mei House, Tsing Yi on 10 and 11 February 2020, the RTHK report stated that the HK Government instantly reported it was not a “U trap” problem [RTHK link] a reference to the SARS outbreak in 2003 where the disease spread through the drainage system in block E Amoy Gardens infecting occupants, and requiring evacuation of the block.

youtube is unreliable at the moment, here is the link https://www.youtube.com/watch?v=GTNvTuV_CM4

I predicted the cause would be the sewer vent pipe, vent pipes are part of the high rise drainage system designed to prevent loss of the water seal in U traps. Subsequently, my suspicion was confirmed, the SMCP newspaper confirmed that the vent piping inside the bathroom was damaged (see SCMP photo below). Therefore, droplets could contaminate the bathroom area.

CREDIT: SCMP Government Press Conference Handout — BROKEN VENT pipe

Still problems in 2020

The photo below taken 15 March 2020 shows damaged drainage system vent piping.

ABOVE: faulty drainage system spreads disease taken 15 March 2020

That drainage system is damaged, it is no longer an enclosed system, allowing odour, bacteria, virus to escape into the air.

We have always known that sewerage and drainage systems are important, providing a conduit for bacteria and viruses, yet the severe lessons from SARS in 2003 and now from COVID19, demonstrate lessons still have not been learned!

COVID19 and Buildings – Tai Po

UPDATE: 15-3-2020

Apple Daily front page news – 15 March 2020

A resident on the top floor (34th floor) of Heng Tai House, Fu Heng Estate, Tai Po has been diagnosed with the novel coronavirus COVID19 today (14-3-2020) RTHK reports [link] and he lives two floors above a couple already diagnosed on 11 March 2020 (same flat number ending with 13).

This is eerily similar to the incident in Tsing Yi in Feb. 2020, where I predicted drainage vent pipes issues, the pipe was subsequently discovered to be damaged, and additionally, repairs were carried out in nine (9) flats while those residents were evacuated.

Read our early blog post

This time, residents in Heng Tai House living in flat numbers ending with 13 and 14 , and living six floors below the “latest case” on 34th floor (top floor) will be evacuated RTHK reports [link].

Why this evacuation is limited to only six floors seems strange, citing droplets from the roof vent (which one?) reentering the building as the reason. While it is not impossible, the airflow pressure and patterns created around buildings are very complex, it seems highly unlikely, that only flats 13 and 14 would be impacted in this style of public housing.

Poor drainage installation risks infection
Poor drainage installation risks infection
Poor drainage installation risks infection

Workplace

It is worthwhile remembering that in the workplace, employers are responsible, by law, for the Health and Safety of their employees! Therefore workers in high traffic areas, for example, healthcare, building management, sewerage plants, transportation, etc. are responsible for their employees Health and Safety (H&S).

#coronavirus #hongkong #2019nCOV #airbourne #kelcroft #novelcoronavirus #SARS #drainage