The Sinclair Refinery is directly to the east of the town of Sinclair, Wyoming (WY) and approximately 6 miles east of the city of Rawlins, WY. The refinery monitors for SO2 in ambient air as part of its regulatory requirements as an operating facility. The monitoring station is less than to 12 mile downwind of the facility toward the east northeast. The predominant wind direction at the Sinclair Refinery is from the west. So the highest ambient concentrations are expected to be east of the facility. Therefore, the monitoring station is appropriate to meet the requirements for ambient air monitoring from emissions of the refinery. No monitoring results are available that would represent the SO2 concentrations in the community, located west of the refinery.
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