The Dalles Middle School gymnasium is back in use by physical education classes after cleanup of water damage suffered on Friday when a kicked ball led to the fire sprinkler system in the building going off.  D-21 Superintendent Candy Armstrong says the walls of the gym are concrete so water intrusion under the walls is not a worry, but there is some sponginess on the floor and they won’t know for a few days how bad that damage is.  Armstrong added the kicked ball hit a fire sprinkler deflector, which caused the system to discharge water.  She says they are working with the sprinkler contractor to come up with a solution to prevent this kind of discharge from happening again.