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Home My WebLink AboutNC0030716_Draft Pemit (Modification)_202405281 , ROY COOPER 1 '4'' Governor -.4" ELIZABETH S.BISER Secretary RICHARD E.ROGERS,JR. NORTH CAROLINA Director Environmental Quality May 28,2024 Ms. Chandra Farmer, PE Director of Utilities Johnston County PO Box 2263, Smithfield, NC 27577 Subject: Draft NPDES Permit Modification Permit NC0030716 Central Johnston County Regional WWTP/210 WWTF Johnston County Grade IV Biological WPCS SIC Code 4952 Dear Ms. Farmer: The Division of Water Resources staff has reviewed your October 27,2023 request for modification of the Central Johnston County Regional WWTP and 210 WWTF's NPDES permit to revise the County's combined Total Nitrogen loading limitation to reflect the transfer of allocation from International Paper Company (NC0003191) to your permit. Your total nitrogen allocation is increased from 73,477 lb/yr to 93,477 lb/yr, reflecting the transfer of 20,000 lb/yr. Enclosed with this letter is a copy of the Draft NPDES permit modification for your facility, with revisions to Section A.(5.)Combined Limitations -Outfall CO1 (Combined Outfalls 001 and 002) [Page 11] and Special Condition A.(12.) Total Nitrogen Allocations [Page 18]. Please review this draft modification carefully to ensure thorough understanding of the requirements and conditions it contains. The NPDES standard conditions (Parts II, III, and IV)that are a part of the permit are not included in this draft document (cover, map, and Part I). The conditions are the same as in your current permit except that agency and division names have been updated. The latest version is available at https://bit.ly/3k5NFaL and can be viewed online or downloaded as a PDF file. Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in the general Johnston County area, soliciting public comments on this draft permit. Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES Permitting Branch, 1617 Mail Service Center,Raleigh,NC 27699-1617 no later than 30 days after receipt of this draft permit. Following the 30-day public comment period, the Division will review all pertinent comments and take appropriate action prior to issuing a final permit. If you have questions concerning this draft permit,please call me at(919)707-3609 or by email at nick.coco(a deq.nc.gov. Sincerely, Docuslgned by: 7900MFBFCA14FD Nick Coco, PE NPDES Municipal Permitting Unit Hardcopy: NPDES Files Ecopy: US EPA Region 4 DWR/Raleigh Regional Office/Water Quality/Scott Vinson &Vanessa Manuel DWR/Basin Planning Branch/Nora Deamer DWR/Public Water Supply North lin Deparuvent 1 vmuality I Divisio R'a Roces 5l2 NorthCaro Sal aisbury Sheet 1161En 1 Maironil SentalervicQe Center ID Raleigh.noY Northter Caresoli Resources 27699-1611 919 707 9000 Permit NC0030716 Footnotes(continued): 4. Effluent sampling for dissolved oxygen,fecal coliform,pH and total residual chlorine shall be conducted as grab samples within 1,800 feet of the receiving stream. 5. TN=TKN+NO3-N+NO2-N where TN is Total Nitrogen,TKN is Total Kjeldahl Nitrogen,and NOB-N+NO2- N are Nitrate and Nitrite Nitrogen,respectively. 6. The combined TN Load limitation is set forth in Special Condition A.(5.).Compliance with the combined limitation shall be determined in accordance with Special Condition A.(11.)Annual Limits for Total Nitrogen. 7. The quarterly average for total phosphorus shall be the average of composite samples collected weekly during the calendar quarter(January-March,April-June,July-September,October-December). 8. Total residual chlorine shall be monitored only if chlorine is added to the treatment process.The Division shall consider all effluent TRC values reported below 50 N g/L to be in compliance with the permit.However,the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory. 9. Chronic Toxicity(Ceriodaphnia)limit at 11.0%with testing in February,May,August and November[see A. (8.)]. 10. Effluent hardness sampling should be performed in conjunction with testing for hardness dependent metals (cadmium,copper,lead,nickel,silver,and zinc). 11. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit[see A.(9.)]. b. There shall be no discharge of floating solids or visible foam in other than trace amounts. A. (5.) COMBINED LIMITATIONS -Outfall CO1 (Combined Outfalls 001 and 002) [15A NCAC 02B.0400 et seq., 15A NCAC 02B.0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302] a. During the period beginning on the effective date of this permit and lasting until permit expiration, the Permittee is subject to the following combined limitation for discharges from Outfalls 001 and 002 in addition to any limits specified in Conditions A.(1.),A.(2.),A.(3.)and A.(4.) of this permit: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS MONITORING REQUIREMENTS Parameter Code Monthly Weekly Daily Measurement Sample Sample Average Average Maximum Frequency Type Location TN Delivered Load2 Qy6cs Monitor and Report Combined 73,477 Ib/yr (eff.through 12/31/24) Annually Calculated 001&002 TN Delivered Load2 Qr66s Monitor and Report Combined 93,477 lb/yr(effective 1/1/2025) Annually Calculated 001&002 Footnotes: 1. TN Loads at Combined Outfall CO1 are the sum of the corresponding values at Outfalls 001 and 002 and shall be calculated in accordance with Special Condition A.(10.)of this permit. 2. Compliance with the nutrient limits shall be determined in accordance with Condition A.(11.)of this permit. A. (6.) DEMONSTRATION OF NITROGEN TREATMENT CAPABILITY [15A NCAC 02H.0100] a. The Permittee shall demonstrate that it has sufficient allocation, offset credits,treatment capability, or other means to comply with the applicable TN Load limit in accordance with 15A NCAC 02B .0700,Nutrient Management StrategyRules,as part of: g i. each application for permit renewal, and ii. each request for increase in its combined permitted flow (Outfall 001 +Outfall 002) beyond 9.5 MGD. b. Each increase in the combined permitted flow beyond 9.5 MGD is further conditioned on the prior written approval of the Director. Page 11 of 22 Michael Montebello,NPDES Branch Chief Modification Effective Date: Month xx, 2024 Permit NC0030716 (B) Membership changes in a compliance association become effective on January 1 of the year following modification of the association's permit. f. The TN monitoring and reporting requirements in this Permit remain in effect until expiration of this Permit and are not affected by the Permittee's membership in a compliance association. A. (12.) TOTAL NITROGEN ALLOCATIONS [15A NCAC 02B .0713] a. The following table lists the Total Nitrogen(TN) allocations assigned to,acquired by, or transferred to the Permittee in accordance with the Neuse River nutrient management rule(15A NCAC 02B .0713)and the status of each as of permit issuance. The allocations in this table are not enforceable limits nor do they supersede any TN limit(s)established elsewhere in this permit or in the NPDES permit of a compliance association of which the Permittee is a Co-Permittee Member. ALLOCATION AMOUNT 1,2 STATUS SOURCE DATE Estuary Discharge STATUS (Ib/yr) (Ib/yr) Base Assigned by Rule 12/7/97; 28,102 56,203 Active (T15A NCAC 02B.0713) 4/1/03 Supplemental Connection of White Oak Plantation WWTP, _ 2,816 5,632 Active formerly NC0060330 Transfer from Buffalo Creek WWTP,formerly Supplemental NC0064556, per River Dell/Heater Utilities 2,816 5,632 Active Bulk Service Agreement Supplemental Purchase from UNIFI-Kinston, NC00043760 12/21/07 1,645 3,290 Active Supplemental Purchase form Town of Benson, NC0020389 4/2/08 360 720 Active Supplemental Purchase from Phillips Plating, NC0001881 8/16/18 1,000 2,000 Active Supplemental Purchase from International Paper, NC0003191 10/13/23 10,000 20,000 Active TOTAL 46,738 93,477 Active Footnote: 1. Transport Factor=50% 2. Total allocations are calculated from the individual values prior to rounding;all values are then displayed to the nearest pound.Thus,the totals shown in the table may differ slightly from the sum of the individual values in the table due to the effects of the rounding. b. Any addition, deletion,or modification of the listed allocations (other than typographical errors) or any change to Active status of any of the listed allocations shall be considered a major modification of this permit and shall be subject to the public review process afforded such modifications under state and federal rules. A. (13.) MERCURY MINIMIZATION PLAN [G.S. 143-215.1(b)] The Permittee shall continue implementing a mercury minimization plan during this permit term. The MMP shall be available for inspection on-site. The MMP should place emphasis on identification of mercury contributors and goals for reduction. Results shall be summarized and submitted with the next permit renewal. Performance of the Mercury Minimization Plan will meet the requirements of the TMDL(Total Maximum Daily Load)for mercury approved by USEPA on October 12,2012,unless and until a Waste Load Allocation specific to this facility is developed and this NPDES permit is amended to require further actions to address the Waste Load Allocation. Page 18 of 22 Michael Montebello, NPDES Branch Chief Modification Effective Date: Month xx, 2024