State Water Resources Control Board Water Quality Order 2014-0057-DWQ National Pollutant Discharge Elimination System General Permit No. CAS000001: Waste Discharge Requirements for Discharges of Stormwater Associated with Industrial Activities Excluding Construction Activities, effective 7/1/2015 through 6/30/2020
B. Sampling and Analysis
A Qualifying Storm Event (QSE) is a precipitation event that:
- Produces a discharge for at least one drainage area; and,
- Is preceded by 48 hours with no discharge from any drainage area.
Magnitude: results in actual discharge
Interval between storms: 48 hours