Wellesley police and fire departments have been on the scene Sunday, along with Massachusetts Department of Environmental Protection and Cyn Environmental Services, regarding a fuel leak into the Fuller Brook that you might be able see here has a little more rainbow-ish color than it should. The oil has made its way into the Caroline Brook and Charles River as well.

Fuller Brook slick from B Brown on Vimeo.

The spill resulted from 400 gallons of heating oil let loose from a “pressure valve that blew on an external line from an oil storage tank coming into the basement of Wellesley High School”, according to a Globe report. Oil flowed from a drain at the school into nearby Skating Pond, then into the Fuller Brook and the Charles.

Officials could be seen Sunday morning at the Wellesley High track parking lot along State and Smith Streets and were there throughout the day, with a clean-up crew seen in a Jon Boat and safety gloves. Absorbent booms have been placed in the brooks to contain the spill, though it’s not clear what remediation efforts might be needed beyond that.

Wellesley High will open as usual, though there might be some residual oil smell despite use of fans and ventilation.