Michigan

Michigan Department of Environmental Quality
Water Resource Division
NPDES Permits
525 West Allegan Street
PO Box 30473
Lansing, MI 48909-7973

PERMIT NO. MIS110000 STATE OF MICHIGAN DEPARTMENT OF NATURAL RESOURCES & ENVIRONMENT NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER DISCHARGES NOT ASSOCIATED WITH SPECIAL-USE AREAS FOR CYCLE-YEAR 1 WATERSHEDS, effective April 1, 2016 through April 1, 2021.

Qualifying storm event means a storm event causing greater than 0.1 inch of rainfall and occurring at least 72 hours after the previous measurable storm event that also caused greater than 0.1 inch of rainfall. Upon request, the Department may approve an alternate definition meeting the condition of a qualifying storm event.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

GENERAL PERMIT NO. MIS210000 STATE OF MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT

STORM WATER FROM INDUSTRIAL ACTIVITY IN CYCLE-YEAR 2 WATERSHEDS - effective April 1, 2012 through April 1, 2017

Section A. Effluent Limitations and Monitoring Requirements

3) Monitoring Storm Water Runoff from a Site of Environmental Contamination or Other Activity (without Secondary Containment or 24-Hour Detention) which May Contribute Pollutants to the Storm Water for which the Department Determines Monitoring is Needed. Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall, causes a discharge, and is at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first 30 minutes of the discharge. Additional samples shall be collected during a discharge event, as necessary, to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

PERMIT NO. MIS310000 STATE OF MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT

STORM WATER FROM INDUSTRIAL ACTIVITY IN CYCLE-YEAR 3 WATERSHEDS - effective April 1, 2013 thru April 1, 2018

No mention of monitoring in the general permit

GENERAL PERMIT NO. MIS120000 MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER DISCHARGES WITH REQUIRED MONITORING, effective April 1, 2016 through April 1, 2021

CYCLE-YEAR 1 WATERSHEDS

Qualifying storm event means a storm event causing greater than 0.1 inch of rainfall and occurring at least 72 hours after the previous measurable storm event that also caused greater than 0.1 inch of rainfall.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

PERMIT NO. MIS220000 STATE OF MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT

STORM WATER DISCHARGES WITH REQUIRED MONITORING

FOR CYCLE-YEAR 2 WATERSHEDS

Monitoring storm water runoff from a Site of Environmental Contamination or other activity (without secondary containment or 24-hour retention) which may contribute pollutants to the storm water for which the Department determines monitoring is needed:

Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall and causes a discharge; and at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first thirty minutes of the discharge. Additional samples shall be collected during a discharge event as necessary to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

PERMIT NO. MIS320000 STATE OF MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER DISCHARGES WITH REQUIRED MONITORING FOR CYCLE-YEAR 3 WATERSHEDS - effective April 1, 2013 thru April 1, 2018

c. Monitoring storm water runoff from a Site of Environmental Contamination or other activity (without secondary containment or 24-hour retention) which may contribute pollutants to the storm water for which the Department determines monitoring is needed.  Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall and causes a discharge; and at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first thirty minutes of the discharge. Additional samples shall be collected during a discharge event as necessary to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

STATE OF MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT  STORM WATER, FROM INDUSTRIAL ACTIVITY AND/OR WITH REQUIRED MONITORING, IN CYCLE-YEAR 4 WATERSHEDS

Section A. Effluent Limitations And Monitoring Requirements

3) Monitoring Storm Water Runoff from a Site of Environmental Contamination or Other Activity (without Secondary Containment or 24-Hour Detention) which May Contribute Pollutants to the Storm Water for which the Department Determines Monitoring is Needed.

Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall, causes a discharge, and is at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first thirty minutes of the discharge. Additional samples shall be collected during a discharge event as necessary to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

GENERAL PERMIT NO. MIS419000 MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER FROM INDUSTRIAL ACTIVITY IN CYCLE-YEAR 4 WATERSHEDS

No mention of storm water monitoring

GENERAL PERMIT NO. MIS429000 MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER DISCHARGES WITH REQUIRED MONITORING CYCLE-YEAR 4 WATERSHEDS

Section A. Effluent Limitations And Monitoring Requirements

Monitoring storm water runoff from a Site of Environmental Contamination or other activity (without secondary containment or 24-hour retention) which may contribute pollutants to the storm water for which the Department determines monitoring is needed: Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall and causes a discharge; and at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first thirty minutes of the discharge. Additional samples shall be collected during a discharge event as necessary to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

PERMIT NO. MIS510000 STATE OF MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT

STORM WATER FROM INDUSTRIAL ACTIVITY AND/OR WITH REQUIRED MONITORING IN CYCLE-YEAR 5 WATERSHEDS

Effective April 1, 2015 through April 1, 2020

Section A. Effluent Limitations And Monitoring Requirements

3) Monitoring Storm Water Runoff from a Site of Environmental Contamination or Other Activity (without Secondary Containment or 24-Hour Detention) which May Contribute Pollutants to the Storm Water for which the Department Determines Monitoring is Needed.

Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall, causes a discharge, and is at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first thirty minutes of the discharge. Additional samples shall be collected during a discharge event, as necessary, to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

GENERAL PERMIT NO. MIS520000 MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER DISCHARGES WITH REQUIRED MONITORING CYCLE-YEAR 5 WATERSHEDS, effective April 1, 2015 through April 1, 2020

Monitoring storm water runoff from a Site of Environmental Contamination or other activity (without secondary containment or 24-hour retention) which may contribute pollutants to the storm water for which the Department determines monitoring is needed: Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall and causes a discharge; and at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first thirty minutes of the discharge. Additional samples shall be collected during a discharge event as necessary to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

PERMIT NO. MIS710000 MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER FROM MUNICIPALLY OPERATED INDUSTRIAL ACTIVITY

No mention of monitoring

PERMIT NO. MIS720000 MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTEWATER DISCHARGE GENERAL PERMIT STORM WATER FROM MUNICIPALLY OPERATED INDUSTRIAL FACILITIES WITH REQUIRED MONITORING

Monitoring storm water runoff from a Site of Environmental Contamination or other activity (without secondary containment or 24-hour retention) which may contribute pollutants to the storm water for which the Department determines monitoring is needed: Samples shall be collected from the discharge resulting from a storm event that is greater than 0.1 inch of rainfall and causes a discharge; and at least 72 hours from the previous measurable (greater than 0.1 inch) storm event. Quantitative data shall be reported for a grab sample taken during the first thirty minutes of the discharge. Additional samples shall be collected during a discharge event as necessary to be representative of the pollutants discharged from the site. Date and duration of the storm event, the rainfall measurement or estimate, duration between the storm event sampled and the end date of the previous measurable storm event, pollutant concentration(s), visual observations, and estimated total volume of the discharge shall be reported.

Magnitude: 0.1 inch or greater

Interval Between Storms: at least 72 hours

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