use sod cutter .you will use less material.put down fabric.use warning track mix .do not use stone dust.this get on spiks and is draged all over.if you use a bobcat it will be a mess and you will use more material.10-15 feet is correct distance.if this is HS field.find rental center with late model sodcutter. good luck any ? email me CJRebels99@aol.com