A new manual has been approved to help local governments regulate the frack sand industry.
Minnesota's Environmental Quality Board approved the handbook Wednesday.
The Winona Daily News reports the manual addresses a wide range of issues, including truck traffic and public safety, air and water pollution and reclamation plans.
The manual suggests best practices and is meant to be a resource, but doesn't set specific guidelines, which industry critics had wanted. The board decided not to include guidelines because there's not yet a good way to measure pollutants related to the frack sand industry.
Several groups and agencies are working to measure the health impact of frack sand. The federal Occupational Safety and Health Administration is among the agencies studying the issue.