Six people were taken to the hospital and 75 residents at the Riverview Retirement Community in the 1800 block of E. Upriver Dr. had to be evacuated Tuesday evening due to a hazardous gas leak. The Spokane Fire Department responded to the call around 7:30 p.m. Upon arrival crews discovered there was a leak of r22 Freon, which is a refrigerant, from a hazardous gas container. Immediately, the incident commander upgraded the call to a hazardous materials response in order to have additional resources respond. The six people taken to the hospital included four firefighters and two facility staff who were exposed to the gas and suffered medical symptoms resulting from the exposure.