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Home My WebLink AboutNCG150018_Representative Outfall Status Initial Request_20231018 Division of Energy, Mineral & Land Resources Date Received Year Month Day iZ It Stormwater Program National Pollutant Discharge Elimination System FOR AGENCY USE ONLY Environmental REPRESENTATIVE OUTFALL STATUS (ROS) Quality REQUEST FORM If a facility is required to sample multiple discharge locations with very similar storm water discharges, the permittee may petition the Director for Representative Outfall Status(ROS). DEQ may grant Representative Outfall Status if storm water discharges from a single outfall are representative of discharges from multiple outfalls. Approved ROS will reduce the number of outfalls where analytical sampling requirements apply. If Representative Outfall Status is granted,ALL outfalls are still subject to the qualitative monitoring requirements of the facility's permit—unless otherwise allowed by the permit(such as NCG020000)and DEQ approval. The approval letter from DEQ must be kept on site with the facility's Stormwater Pollution Prevention Plan. The facility must notify DEQ in writing if any changes affect representative status. For questions, please contact the DEQ Regional Office for your area (see page 3). (Please print or type) 1) Enter the permit number to which this ROS request applies: Individual Permit (or) Certificate of Coverage N C S N C G 1 5 0 0 1 8 2) Facility Information: Owner/Facility Name Duplin County/Duplin County Airport Facility Contact Joshua Raynor,Airport Director Street Address 260 Airport Rd City Kenansville State NC ZIP Code 28349 County Duplin E-mail Address airportoperations@duplincountync.com Telephone No. 910 296-2188 Fax: 3) List the representative outfall(s) information (attach additional sheets if necessary): Outfall(s) Number 3&5 is representative of Outfall(s) 1,2,4,and 6 Outfalls' drainage areas have the same or similar activities? ix Yes ❑ No Outfalls' drainage areas contain the same or similar materials? ® Yes ❑ No Outfalls have similar monitoring results? ❑ Yes ❑ No ® No data* Outfall(s) is representative of Outfall(s) Outfalls' drainage areas have the same or similar activities? ❑ Yes ❑ No Outfalls' drainage areas contain the same or similar materials? ❑ Yes ❑ No Outfalls have similar monitoring results? ❑ Yes ❑ No ❑ No data* Outfall(s) is representative of Outfall(s) Outfalls' drainage areas have the same or similar activities? ❑ Yes ❑ No Outfalls' drainage areas contain the same or similar materials? ❑ Yes ❑ No Outfalls have similar monitoring results? ❑ Yes ❑ No ❑ No data* *Non-compliance with analytical monitoring prior to this request may prevent ROS approval. Specific circumstances will be considered by the Regional Office responsible for review. Page 1 of 3 SWU-ROS-2009 Last revised 12/30/2009 Representative Outfall Status Request 4) Detailed explanation about why the outfalls above should be granted Representative Status: See attachment 5) Certification: North Carolina General Statute 143-215.6 B(i) provides that: Any person who knowingly makes any false statement,representation,or certification in any application,record, report,plan,or other document filed or required to be maintained under this Article or a rule implementing this Article;or who knowingly makes a false statement of a material fact in a rulemaking proceeding or contested case under this Article;or who falsifies,tampers with,or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under this Article or rules of the [Environmental Management] Commission implementing this Article shall be guilty of a Class 2 misdemeanor which may include a fine not to exceed ten thousand dollars($10,000). I hereby request Representative Outfall Status for my NPDES Permit. I understand that ALL outfalls are still subject to the qualitative monitoring requirements of the permit, unless otherwise allowed by the permit and regional office approval. I must notify DEQ in writing if any changes to the facility or its operations take place after ROS is granted that may affect this status. If ROS no longer applies, I understand I must resume monitoring of all outfalls as specified in my NPDES permit. I certify that I am familiar with the information contained in this application and that to the best of my knowledge and belief such information is true, complete, and accurate. Printed Name of Person Signing: Josh,,,, Title: ,4,./..par-1- D'tecfigr Lipt (Si nature of Applicgrft) (Date Signed) Please note: This application for Representative Outfall Status is subject to approval by the NCDEQ Regional Office. The Regional Office may inspect your facility for compliance with the conditions of the permit prior to that approval. Final Checklist for ROS Request This application should include the following items: ❑ This completed form. ❑ Letter or narrative elaborating on the reasons why specified outfalls should be granted representative status, unless all information can be included in Question 4. ❑ Two (2) copies of a site map of the facility with the location of all outfalls clearly marked, including the drainage areas, industrial activities, and raw materials/finished products within each drainage area. ❑ Summary of results from monitoring conducted at the outfalls listed in Question 3. ❑ Any other supporting documentation. Page 2 of 3 SWU-ROS-2009 Last revised 12/30/2009 REPRESENTATIVE OUTFALL STATUS (ROS)REQUEST FORM NARRATIVE for DPL Duplin County Airport NCG150018 The topography of the terrain within the Airport is generally flat. The Airport is located in the inner coastal plain of Eastern North Carolina. Predominately located in a rural farming and agribusiness area in proximity to Buckskin Swamp. The Airport is located within the Cape Fear River Basin, with Grove Creek approximately 0.5-mile southwest of airport property, Beaverdam Branch approximately 0.5-mile north of Runway 5/23, and Buckskin Swamp flowing east and crossing airport property. The airport is not located within a water supply watershed, and there are no restrictions on watershed development activities in the project area. Stormwater runoff from the western portion of the Airport; which includes the airport terminal, terminal apron, general aviation hangars and associated taxiways; generally runs to the east within Buckskin Swamp under Runway 05-23. Stormwater runoff from the east portion of the Airport; which includes Runway 5-23; flows east into Buckskin Swamp Creek, which then flows through Grove Creek to the Northeast Cape Fear River. Buckskin Swamp begins west of Airport property and then flows eastward before discharging into Grove Creek. Stormwater runoff from the south portion of the Airport; which includes Runway 5-23 and Taxiway A flows south into a riverine which empties into Grover Creek, which drains into Northeast Cape Fear River. There are six stormwater outfalls from the Airport Property, listed below: Table 1-2 Outfall and Drainage Basin Characteristics OUTFALL OUTFALL LATITUDE* LONGITUDE* DRAINAGE DRAINAGE AREA IMPERVIOUS PERCENT OFF-SITE I.D. TYPE BASIN (acres) AREA(acres) IMPERVIOUS RUN-ON Grass-lined 1 N 35° 0'31" W 77° 58'31" 1 14.3 1.0 7.0 Forested swale Grass-lined 2 N 35° 0'29" W 77° 58'24" 2 15.7 0.3 1.9 Forested swale 48" Concrete Forested/ 3 Headwall N 35° 0'3„ W 77° 58'47" 3 71.1 9.9 13.9 Agricultural Observation Grass-lined Forested/ N 35° 0'9" W 77° 58'53" 3A 40.3 2.0 5.0 Point 3A swale Agricultural 4 Grass-lined N 34° 59'55" W 77° 58' 52" 4 25.2 1.5 6.0 None swale 60" Concrete 5 N 34° 59'26" W 77° 59'20" 5 89.0 10.0 11.2 Forested Headwall 6 36" HDPE N 34° 59'24" W 77° 59'21" 6 54.9 0.0 0.0 Forested *Obtained from available maps. These six outfall locations are shown on the attached map, which was included in the 2011 SWPPP for the Airport. The only new development on the property since the 2011 SWPPP occurred in the same area that all industrial activities occurred in the past- the west side of the airport surrounding the airport terminal building. An additional map is provided to show these new buildings and any hazardous materials used or stored at the new locations (for the updated SWPPP, currently in progress, a new updated site map is being produced). All hazardous pollutant substances that drain from the airport would be traced back to stormwater runoff originating in this area of the property, via the same conveyances shown in the 2011 SWPPP site map, specifically, RC Pipe and grass-lined swales. Contours for the new development did not change the direction of flow nor the specific outfall impacted by runoff. The Airport respectfully requests assignment of Outfall #5 as the representative outfall for Outfalls 1, 2, 3, 4, and 6. Stormwater runoff from much of the southern portion of the Airport flows south to Outfall #5. This area includes portions of the runway and taxiway, the terminal buildings, parking lot, fuel farm, NC Forest Service hangars, and portions of the Jet Techs maintenance hangar and the two corporate hangars. Outfall #5 is located at a 60-inch concrete headwall along the south end of the runway. Outfall #5 ultimately discharges to Grove Creek. Monitoring is conducted at the headwall.