What kind of sampling is the City required to do?
Rain event sampling started in the 2015 permit cycle. The City must collect samples from both upstream and downstream locations four separate times a year during the rising stages of Bull Creek, Turkey Creek and Mingenback Lake after it has rained a half inch or more. Two events must be collected between March and June and the other two between July and November.

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1. What is the National Pollutant Discharge Elimination System (NPDES)?
2. What is the Municipal Separate Storm Sewer System (MS4)?
3. Why does the City have a Phase II permit?
4. What does the Phase II permit require?
5. What kind of sampling is the City required to do?
6. What are the Six Minimum Control Measures?