ALPINE TOWNSHIP, MI -- Firefighters are letting a massive fire at Fox Pools in Alpine Township burn out because of concern about possible contaminated water running off into nearby grounds.

Fox Pools sells all types of pools and pool equipment, as well as pool chemicals. Those chemicals include bromine and chlorine.

A hazardous materials team was called to the scene to assess the situation.

The fire started about 10 a.m. at the building on Alpine Avenue NW near Eight Mile Road.

The company's website indicates the business is a "father and son owned business that has been installing swimming pools for over 40 years."

The fire sent heavy black smoke in the air near M-37. Authorities closed off M-37 for a period.

All employees safely evacuated. They believed the fire started in a garage area.

"There's nothing you can do now. Just be glad and thankful everyone's OK," said Lauren Fox, granddaughter and daughter of owners.

Fire officials said there was little danger from letting the chemicals burn.