(08-28) 12:25 PDT SAN FRANCISCO -- San Francisco officials this week released the addresses on Treasure Island where higher-than-normal radiation readings were detected underground in recent months. And they again sought to assure the public that the tests did not indicate there is a health threat. All three locations - an occupied home at 1240-D Northpoint Drive, a storage shed behind an occupied home at 1241-B Northpoint Drive and a vacant home at 1303-F Gateview Avenue - fell well below the threshold for concern set by the Navy and state health officials, said Treasure Island Development Authority development director Bob Beck.