Zone 3 and Zone 4 are governed by the Radio Astronomy Zoning Act which is the Chapter 37A of the West Virginia Code. It strictly regulates radio transmitters within and within of the Green Bank Observatory, respectively. Within these zones, interference to observations will be identified and documented. The owners of the offending equipment will be personally visited to request cooperation in eliminating the interference. Enforcement is used as a last resort. Enforcement in Zone 4 may be more lenient than the limit set in the Chapter 37A.