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Image courtesy of Joshua Doubek/ Wikimedia Commons.

A clean-up is underway in Kingfisher County, Oklahoma after over 400 barrels of hydrochloric acid spilled at a fracking well site Monday.

The spill occurred at a well site run by Oklahoma-based Blake Production.

Blake was preparing to complete work on the well when a tank spilled out more than 20,000 gallons of acid.

Owner of Blake Production Blake Vernon said equipment rented from Woodward, Oklahoma-based Kwick Rental leaked between 350 and 500 barrels of acid at the site, the Oklahoma-based Enid News said.

The spill wasn’t noticed until workers arrived at the site on Tuesday morning.

No injuries have been reported.

Hydrochloric acid is used to clear out cement debris left over from drilling and also helps open the underground shale fractures.

The Oklahoma Corporation Commission, the state’s oil and gas regulator, said some of the acid spilled into a nearby alfalfa field and killed vegetation.

There was no water contamination.

The clean-up crew installed metal barriers to prevent rain from carrying the acid into a nearby creek.

The acid must be neutralized before contaminated soil can be removed.

The Oklahoma Corporation Commission is overseeing the clean-up.

The Oklahoma Department for Environmental Quality examined the spill site Thursday.

“I’ve never heard of a spill this size occurring in relation to fracking materials. At the very least, this is very unusual. This might be the biggest one we’ve seen,” the commission’s spokesman Matt Skinner told the Enid News.

The commission is investigating the cause of the spill.