Can you clarify how to calculate TSS for the 20% and 40% reduction of total suspended solids requirement for municipalities?
Issue Under s. NR 151.13 (2), Wis. Adm. Code, a municipality subject to the municipal storm water permit requirements of subch. I of ch. NR 216, Wis. Adm. Code, must, to the maximum extent practicable, implement a 20% and a 40% reduction in total suspended solids in runoff that enters waters of the state as compared to no controls, by March 10, 2008 and March 10, 2013, respectively. Staff who work with affected municipalities need guidance on what areas under the municipalities’ jurisdictions will be included in this requirement. They also need to know what is meant by “no controls” and “with controls”, and what methods are acceptable for making these calculations.
