IDAHO FALLS, Idaho (KIFI) - Crews will be working over the weekend at Skyline High School to clean water tanks associated with the school's air conditioning system. In a letter to parents, Idaho Falls School District 91 superintendent Karla LaOrange said they have contracted with Bio One to clean the tanks on Saturday, May 9, and Sunday, May 10. It all part of making sure the system is safe to return to service. On Monday, May 11, the tanks will…