California

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

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