North Carolina

North Carolina Department of Environment and Natural Resources
Division of Water Quality, Wetlands and Stormwater Branch
Stormwater Permitting Unit
1601 Mail Service Center
Raleigh, NC 27699-1601

GP NO. NCG020000 to Discharge SW, Mine Dewatering & Process WW under NPDES Permit Text, effective 10/1/2015 thru 9/30/2020.

A measurable storm event for the purposes of this General Permit is a storm event that results in an actual discharge from the permitted site outfall. The time between this storm event and the previous measureable storm event must be at least 48 hours.

Magnitude: actual discharge

Interval Between Storms: at least 48 hours

GP NO. NCG030000, Metal Fabrication - effective November 1, 2012 thru October 31, 2017

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG050000, Apparel, Printing, Leather, Rubber, expires May 31, 2018

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG060000, Food and Kindred, effective 12/1/12 thru 10/31/17

15. Measurable Storm Event

A storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval may not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and obtains approval from the local DWQ Regional Office. Two copies of this information and a written request letter shall be sent to the local DWQ Regional Office. After authorization by the DWQ Regional Office, a written approval letter must be kept on site in the permittee’s SPPP.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No NCG070000, Stone, Clay, and Glass, expires May 31, 2018

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG080000, Transit and Transportation - effective November 1, 2012 through October 31, 2017

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG100000, Used Motor Vehicles - effective November 1, 2012 thru October 31, 2017

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG110000 Treatment Works, expires May 31, 2018

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG090000, Paints and Varnishes - effective November 1, 2012 thru Oct. 31, 2017

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP NO. NCG120000, Landfills - effective November 1, 2012 thru Oct. 31, 2017

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72- hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG130000, Non-Metal Waste & Scrap, May 31, 2018

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in actual discharge

Interval Between Storms: at least 72 hours

GP No NCG140000, Ready-Mixed Concrete, July 1, 2016 thru June 30, 2017

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and obtains approval from the local DWQ Regional Office. See definitions for more information.

Magnitude: results in discharge

Interval Between Storms: at least 72 hours

GP NO NCG150000, Airports

ffective September 1, 2014 thru August 31, 2019 A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DEMLR Regional Office.

Magnitude: at least 0.1 inch

Interval Between Storms: at least 72 hours

GP NO. NCG160000, Asphalt Paving Mixtures, Blocks

Effective 10/1/2014 through 9/30/2019 A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DEMLR Regional Office.

Magnitude: at least 0.1 inch

Interval Between Storms: at least 72 hours

GP No. NCG170000, Textile Mills

August 1, 2014 thru July 31, 2014 A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DEMLR Regional Office.

Magnitude: at least 0.1 inch

Interval Between Storms: at least 72 hours

GP No. NCG180000, Furniture Manufacture

September 1, 2014 thru August 31, 2019 A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DEMLR Regional Office.

Magnitude: at least 0.1 inch

Interval Between Storms: at least 72 hours

GP No. NCG180000, Furniture Manufacture

A representative storm event is a storm event that measures greater than 0.1 inches of rainfall. The time between this storm event and the previous storm event measuring greater than 0.1 inches must be at least 72 hours. A single storm event may have a period of no precipitation of up to 10 hours. For example, if it rains but stops before producing any collectable discharge, a sample may be collected if the next rain producing a discharge begins within 10 hours.

Magnitude: at least 0.1 inch

Interval Between Storms: at least 72 hours

GP NO NCG190000, Marinas and Shipbuilding, effective 6/2/2015 thru 5/31/2020

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DEMLR Regional Office.

Magnitude: actual discharge

Interval Between Storms: at least 72 hours

GP NO. NCG200000, Scrap Metal 2/2/2015 thru 12/31/2019

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DEMLR Regional Office.

Magnitude: actual discharge

Interval Between Storms: at least 72 hours

GP No. NCG210000, Timber Products, effective August 1, 2013 thru July 31, 2018

A measureable storm event is a storm even that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DWQ Regional Office.

Magnitude: results in discharge

Interval Between Storms: at least 72 hours

GP No. NCG220000, Wood chip Mills-permit expired & Will not be renewed. Now covered under NCG210000.

GP NO NCG240000 Composting Operations. Effective 9/28/2016 through 9/30/2017

A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The time between this storm event and the previous storm event must have been at least 48 hours. One storm event may have a time period within it that has no precipitation. This time period may last up to 10 hours. For example, if it rains but stops before producing any collectable discharge, a sample may be collected if the next rain producing a discharge begins within 10 hours.

Magnitude: results in discharge

Interval Between Storms: at least 48 hours

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