Authority: IC 13-14-8; IC 13-14-9; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3
Affected: IC 13-11-2; IC 13-18-4
Sec. 4.
"Ambient upstream concentration" means the concentration of a substance occurring immediately upstream of the point of discharge, which is present, or likely to be present, in the absence of upstream point source contributions.
327 IAC 5-1.5-4