Maria das Graças Foster Maria das Graças Foster , the embattled head of Petrobras , is set to step down to help resolve a crippling corruption scandal at the Brazilian state-owned oil company, sources at the presidential palace in Brasília said. The sources said they were unable to provide an exact timetable for her departure but indicated it could be as early as the end of this month. President Dilma Rousseff was reported to have met Ms Graças Foster on Tuesday. A person familiar with the matter said Ms Graças Foster’s position had become “untenable” at Petrobras, which is at the centre of allegations that executives collaborated with politicians, contractors and black market money dealers to cream billions of dollars from the company’s projects in bribes and kickbacks. A spokesperson for the presidential palace refused to comment on Tuesday. A close friend of Ms Rousseff, Ms Graças Foster […]