New York

New York State Department of Environmental Conservation
Division of Water
Multi-Sector General Stormwater Permit
625 Broadway
Albany, NY 12233-3500

General Permit (MSGP) for Stormwater Discharges Associated with Industrial Activity (GP-0-11-009) - effective March 28, 2012 through September 30, 2012.

(1) When and How to Sample - A minimum of one grab sample must be taken from the discharge associated with industrial activity resulting from a storm event with at least 0.1 inch of precipitation (defined as a "measurable" event), providing the interval from the preceding measurable storm is at least 72 hours. The 72-hour storm interval is waived if the preceding measurable storm did not result in a stormwater discharge (e.g. a storm events in excess of 0.1 inches may not result in a stormwater discharge at some facilities), or if the permittee is able to document that less than a 72 hour interval is representative for local storm events during the sampling period.

Magnitude: greater than 0.1 inches

Interval Between Storms: at least 72 hours, unless representative

NYS Department of Environmental Conservation SPDES Multi-Sector General Permit for Stormwater Discharges Associated with Industrial Activities (GP-0-12-001), - effective October 1, 2012 thru September 30, 2017

Qualifying Storm Event a storm event with at least 0.1 inch of precipitation (defined as a "measurable" event), providing the interval from the preceding measurable storm is at least 72 hours. The 72-hour storm interval is waived if the preceding measurable storm did not result in a stormwater discharge (e.g., a storm events in excess of 0.1 inches may not result in a stormwater discharge at some facilities), or if the owner or operator is able to document that less than a 72 hour interval is representative for local storm events during the sampling period.

Magnitude: greater than 0.1 inches

Interval Between Storms: at least 72 hours, unless representative

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