Nebraska

Nebraska Department of Environmental Quality
Water Quality Division, Industrial Storm Water
1200 N Street, Suite 400
PO Box 98922
Lincoln, NE 68509

Authorization to Discharge Under the NPDES General NPDES Permit Number NER900000 for Storm Water Discharges From Industrial Activity to Waters of the State of Nebraska

6.1.3 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). In the case of snowmelt, the monitoring must be performed at a time when a measurable discharge occurs at your site. For each monitoring event, except snowmelt monitoring, 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. For snowmelt monitoring, you must identify the date of the sampling event and indicate that the sampling event was for snowmelt.

6.1.4 Sample Type

You must take a minimum of one grab sample from a discharge resulting from a measurable

storm event as described in Part 6.1.3. and a minimum of one grab sample from snowmelt, a total of four samples. Samples must be collected within the first 30 minutes of a measurable storm event. If it is not possible to collect the sample within the first 30 minutes of a measurable storm event, the sample must be collected as soon as practicable after the first 30 minutes and documentation must be kept with the SWPPP explaining why it was not possible to take samples within the first 30 minutes. In the case of snowmelt, samples must be taken during a period with a measurable discharge.

Magnitude: results in discharge

Interval Between Storms: at least 72 hours

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