The Kelowna Hazmat team set up in the alley behind the Canada Post warehouse on Baillie Road after an unknown substance was found in a mailbox on the westside Monday morning.
Dale Calhoun with the Kelowna Fire Department says Hazmat was deployed after a mail person picked up some fine yellow sand from a mailbox and brought it to the depot where the mail is stored.
He said the person scooped up the material and put it in a Tupperware container.
"They did get concerned when they did not know what the product was. We are assembling our Hazmat team to do a small decontamination to test the product itself to see what the product is," said Calhoun.
"We have three people that have been in contact with the product itself."
Calhoun said the three are not showing any ill effects.
Ambulance crews are also standing by.
Workers have been moved away from the area as a precaution.
While Calhoun said the material likely does not pose a threat the incident was not handled properly.
"First thing is when you identify an unknown product, call the fire department and have them test it out. It takes a little bit of time to get set up, but the testing is worth the risk of saving someone else's life."
He said they will use the incident to educate the workers on how to handle these types of products in the future.