This brings the total amount of coffins found at the “mass grave feature” to 20 thus far, according to the city of Tulsa. After conducting the majority of the groundwork this week, the formal exhumation process is expected to start on Monday, June 7, the city said in a statement. An eight-member team from the Tampa, Florida, office of Cardno Inc., an environmental and infrastructure company, is expected to be at Oaklawn Cemetery up to six to eight weeks completing