Louisiana Department of Environmental Quality
Office of Environmental Services, Water Permits Division
Galvez Building, 602 North 5th Street
PO Box 4313
Baton Rouge, LA 70821-4313

Louisiana Pollutant Discharge Elimination System Homepage

LPDES Multi-Sector General Permit for Storm Water Discharges Associated with Industrial Activities. Permit No. LAR050000 Effective May 9, 2016 through May 9, 2021

3.2.41 Measurable Storm Events

All required monitoring must be performed on a storm event that results in an actual discharge from your site (“measurable storm event”) that follows the preceding measurable storm event by at least 72 hours (3 days). The 72-hour (3-day) storm interval does not apply if you are able to document that less than a 72-hour (3-day) interval is representative for local storm events during the sampling period. For each monitoring event you must identify the date and duration (in hours) of the rainfall event, rainfall total (in inches) for that rainfall event, and time (in days) since the previous measurable storm event.

Magnitude: 0.5 inch or greater

Interval Between Storms: at least 72 hours, unless representative

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