BURLINGTON, Vt. (AP) — City officials in Burlington, Vermont, are explaining two significant discharges from Burlington's main sewage treatment plant into Lake Champlain.

Nearly 2 million gallons of partially disinfected wastewater was released between last Saturday and Tuesday.

The city's Department of Public Works director tells MyNBC5 that the discharges were driven by a storm water surge from heavy rain and a concentration of high phosphorus wastewater from Burlington's food and beer manufacturers that disrupted the normal biological process of wastewater treatment.

City beaches were temporarily closed and have reopened.

The department says it's working with industrial customers to have pre-treatment agreements that would result in more consistent biological conditions at the plant. The city is also working to manage storm water during heavy rain events.