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
18.104.22.168 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