- (1) Data from all stations shall be considered when determining episode conditions. The department shall specify PM-10 monitoring stations to be operated continuously during any episode stage for episode management purposes. Stations from which episode declarations are based must be located in such a manner that the area represented by that station and the sources contributing to the episode condition can reasonably be determined and corrective actions taken.
- (2) Sampling and analysis will be done by federal reference or federal equivalent methods; except the department may approve other sampling and analysis methods for PM-10 if reasonable site specific equivalency with the federal reference method has been demonstrated. This equivalency must be reestablished biennially.
[Statutory Authority: Chapters 70.94 and 43.21A RCW. WSR 89-02-055 (Order 88-39), § 173-435-070, filed 1/3/89; Order DE 77-21, § 173-435-070, filed 10/31/77.]