Section 42704 Of Chapter 5. Monitoring Devices From California Health And Safety Code >> Division 26. >> Part 4. >> Chapter 5.

. After the state board has made a determination of availability, the state board may, as appropriate, revoke or modify its prior determination of availability if circumstances beyond the control of the state board, or of a stationary source required to install a monitoring device, cause a substantial delay or impairment in the availability of the device or cause the device no longer to be available.