Excavate a 500′ long trench, that is 8′ deep and 3.25′ wide. It is sloped on both sides at 45 degree inclines. What is the total number of cubic yards to be removed?

Excavate a 500′ long trench, that is 8′ deep and 3.25′ wide. It is sloped on both sides at 45 degree inclines. What is the total number of cubic yards to be removed?