Aberdeen City Council has been ordered to improve after an investigation found an asbestos incident contravened health and safety law.
Teachers, janitors, cleaners and other workers were allowed on to the Bridge of Don Academy site following the incident in July.
The Health and Safety Executive (HSE), which launched an investigation, has identified health and safety law contraventions and issued a notice of contravention (NOC) to the council.
They said the procedures for dealing with accidental disturbance and damage to asbestos were “not sufficiently robust to be effective” and has ordered the council to improve the level of training.
A letter from inspectors said an apprentice joiner had removed an insulation board from above a doorway as part of work to move the door.
It said that having removed the board using a hammer and chisel, he realised it might be asbestos-containing material and contacted his supervisor.
The broken board was double wrapped in plastic and placed beside the skip and a further piece of board, still in position above the door and intact, was covered using a ceiling tile and cardboard.
An email was sent to the architect requesting a sample be taken as asbestos was suspected but the HSE said “no action” was taken to deal with any potential contamination of the area of the individuals involved.
When the remaining board was sampled five days later the asbestos officer indicated he thought it was asbestos-containing material.
It was only at this point the risk control team was informed and the fact there was broken material came to light.
The HSE said no action was taken to restrict access to the area, although the doorway was taken out of use.
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Tommy Campbell, Unite regional officer, welcomed the “thorough” report. He added: “It indicates everything we have said but the council is still ignoring our suggestion to jointly monitor the work of contractors and sub-contractors on council properties.”
A HSE spokeswoman said: “The council has been given until December 20 to confirm their actions on the findings.”
A spokesperson for the council said: “Aberdeen City Council takes its health and safety responsibility seriously and we are concerned that such a serious incident occurred.
“The council has co-operated fully with the Health and Safety Executive and acknowledges their findings as detailed in their report.
“As a result of its internal investigation the council has put in place further measures to ensure its health and safety procedures, and operating procedures are robust.
“As part of our ongoing commitment to health and safety we will communicate the findings to staff and contractors to maximise awareness of the issue to ensure that all necessary steps are taken in order that this type of incident does not happen again.”