Last year, Rocky Flats took down bldg. 881 with controlled explosives, and took air samples downwind. Any list reader involved in those measurements? I have a similar project and have a few questions. Please contact me off-list. Thanks. Joel I. Cehn, CHP _joelc at alum.wpi.edu_ (mailto:joelc at alum.wpi.edu) 510.268.1571