Remove the backboard and hoop from the pole to decrease the weight on top of the pole. It should slide off the top of the pole (with the help of some basic tools and WD-40). Be sure to unlatch the top portion before attempting to remove.
Using the power saw, cut the metal pole in half to decrease the weight of the portion stuck in the ground. After this is complete, cut the pole as close to the ground as you can so that very little is sticking out of the ground. Be extremely careful using a power saw and be sure to take all safety precautions.
Using a combination of the shovel and sledgehammer to remove dirt and knock the concrete base loose, remove the pole from the ground so that all you are left with is a hole in the ground and a small metal pole with a concrete slab attached to the bottom.
Using the sledgehammer, remove any remaining pieces of concrete on the pole to make both ends easier to dispose of.
Fill in the hole with dirt (the original or dirt you've bought from the store). Safely and properly dispose of all parts of the basketball system and ensure that there are no pieces of metal or concrete laying around on the ground.