04/11/2014 06:03 EDT | Updated 06/11/2014 05:59 EDT

Black slick discovered on Alberta lake, cleanup crews set up booms

INNISFAIL, Alta. - Environment workers are trying to contain a black slick discovered on a small Alberta lake.

The province says it learned Friday morning of the spill of unknown hydrocarbons on Dodds Lake in Innisfail, south of Red Deer.

Hydrocarbons can include oil and gas.

Officials say the slick stretches about 15 metres and appears to have come from a drainage culvert.

Firefighters are using booms to stop the leak and prevent the slick from spreading.

The town's website says the lake is a popular swimming and water-skiing spot.