The third Minimum Control Measure (MCM3) is Illicit Discharge Detection and Elimination. MS4 communities must develop and implement a plan to detect and eliminate illicit discharges to the storm sewer system (including developing a system map and informing the community about hazards associated with illegal discharges and improper disposal of waste).
CSN Reports:


CSN Webcasts:
http://chesapeakestormwater.net/2017/09/webcast-tracking-and-eliminating-illicit-discharges/
http://chesapeakestormwater.net/2015/02/webcast-discharge-discovery-techniques/
http://chesapeakestormwater.net/2015/01/nutrient-discharges-from-grey-infrastructure/