What is the impact zone for the Study? What is the basis for this determination?

The primary impact zone is a five- to six-mile radius south of the blowout site. The impact zone was determined based on:

1. Remote sensing satellite retrievals of methane, which is the main part of natural gas and an indicator for associated air toxins;
2. Self-reported symptom data from LACDPH;
3. Local methane monitoring data collected during the blowout; and
4. A sophisticated chemical transport model that modeled emissions.

For further discussion on the methodology used to arrive at the impact zone, please refer to Community Meeting #2.