The State of Idaho Capitol Mall geothermal system has been in operation since 1982. The system extracts geothermal water to supply about ninety percent of the heat required for nine buildings in the downtown Boise area including the State Capitol. The cost savings over natural gas heating are estimated to be $400,000 per year. The primary components of the system are: 1) a production well, 2) heat exchangers, 3) underground delivery and collection pipes, and 4) an injection well. Production, temperature and system operation data have been recorded manually on Daily Logs since May, 1983. In 1991, the Department of Administration-Building Services made this data available through computer Trend Logs which capture information every six hours