How are setback distances determined?
Sour gas facilities are categorized by the ERCB into four hazard levels based on release rates for wells, release volumes for pipelines, and hydrogen sulphide (H 2 S) content. There are predetermined setback distances for each level of sour gas facility. Once the appropriate level has been established for a particular facility, ERCB staff then examine the types of developments in the vicinity and how people typically use the general area. For example, ERCB staff would check to see if there are houses, schools, or hospitals close by. If necessary, a setback distance may be increased due to these types of developments.
