Wyoming Department of Environmental Quality
Water Quality Division
WYPDES Storm Water Program
Herschler Building, 122 West 25th Street
Cheyenne, WY 82002

Authorization to Discharge Storm Water Associated with Industrial Activity, General WYPDES Permit WYR00-0000 - effective October 19, 2012 thru August 31, 2017 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. In the case of snowmelt, the monitoring must be performed at a time when a measurable discharge occurs at your site.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

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