Indiana Code Title 13. Environment § 13-18-27-18

Sec. 18. (a) If:

the MS4 community may not order work on the construction project to stop on the grounds that the erosion and sediment control measures included in the construction plan are not adequate unless the project site owner is notified in writing of the inadequacies that the MS4 community perceives in the erosion and sediment control measures and the perceived inadequacies are not resolved within seventy-two (72) hours after the project site owner receives the written notice.

(b) This section does not prohibit an MS4 community from ordering work on a construction project to stop if the project site owner is creating a public health hazard or a safety hazard.