Wednesday, May 03, 2006
Determination of Opacity of Fugitive Dust
In determining the opacity of fugitive dust the Utah Department of Air Quality uses an observation method based on the EPA’s method 9 technique. That method is as follows:
...Six points, distributed along the length of the haul road or in the operational area, shall be chosen by the executive secretary or the executive secretary’s representative. An opacity reading shall be made at each point when a vehicle passes the selected points. Opacity readings shall be made ½ vehicle length or greater behind the vehicle and at approximately ½ the height of the vehicle or greater. The accumulated six readings shall be averaged for the compliance value.. (Utah Division of Air Quality New/modified Source Plan Review § IV(27)
...Six points, distributed along the length of the haul road or in the operational area, shall be chosen by the executive secretary or the executive secretary’s representative. An opacity reading shall be made at each point when a vehicle passes the selected points. Opacity readings shall be made ½ vehicle length or greater behind the vehicle and at approximately ½ the height of the vehicle or greater. The accumulated six readings shall be averaged for the compliance value.. (Utah Division of Air Quality New/modified Source Plan Review § IV(27)
# posted by Randy B. Birch @ 6:23 PM 
