Cleanup crews are trying to determine how much runoff from an industrial fire in Etobicoke a week ago has made its way into Lake Ontario, the province's environment ministry says. The ministry has said the runoff is affecting two waterways, Mimico Creek and Humber Creek, and containment measures have been in place since August 11 in both creeks. On Friday, it said while measures along Mimico Creek were reinforced Wednesday, Thursday's rain night enabled the spill to move further down Mimico Creek.