Televised ducts under slab floor of basement level. Ducts are concrete ducts possibly transite. Customer has had them tested for asbestos and is waiting on results. There are no metal connections or elbows. All elbows and tees are manufactured concrete. There was standing water in the duct run along the left side of the house and the front of the house when looking at the house from the street. Suggest spray lining ducts with Duct Armor duct lining material to encapsulate the concrete.