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HomeMy WebLinkAboutNC0073539_Fact Sheet_20240222 DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-lCF1970B553A NCDEQ/DWR/NPDES EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL NPDES Permit NCO073539 Caroline Robinson/Compliance&Expedited Permitting Unit/caroline.robinson(kdeq.nc.gov/Jan 2024 FACILITY INFORMATION Applicant/Facility Name Aqua North Carolina,Inc. (Joe Pearce and Robyn Lambeth) Willowbrook Subdivision WWTP Applicant Address 202 MacKenan Court, Cary,NC 27511 Facility Physical 12309 Ramah Creek Court,Huntersville,NC 28078 Address/Mailing Address Permitted Flow(MGD) 0.048 MGD Type of Waste 100%Domestic, < 1 MGD Facility Class WW-2 County Mecklenburg Permit Status Renewal Regional Office MRO STREAM CHARACTERISTICS Receiving Stream Ramah Creek Stream C Classification Stream Segment 13-17-4-4 Outfall Lat. 350 26' 38"N 7Q 10 - Summer(cfs) 0.075 Outfall Long. 800 49'09" W 7Q10 -Winter(cfs) 0.15 Drainage basin Yadkin-Pee Dee River Basin 30Q2 (cfs) 0.15 Subbasin 03-07-11 Average Flow(cfs) 1.5 HUC 030401050101 IWC (%) 49.80%(summer)/ 303(d)List No 33.16%(winter) BASIC INFO FOR EXPEDITED PERMIT RENEWAL Already present in permit;however,revised ammonia limits,based on the IWC calculations and 2016 NH3 guidance document,will take effect on 1/l/2028. These Does permit need Daily Max NH3 limits? revised limits include,a monthly summer limit of 2 mg/L,a daily summer limit of 10 mg/L, a monthly winter limit of 5 mg/L, and a daily winter limit of 25 mg/L. Does permit need TRC limits/footnote? No—Already present in permit. Does permit have toxicity testing? No—not a complex wastestream Does permit have any Special Conditions? No Does permit have instream monitoring? Yes—U&D for Temperature and Dissolved Oxygen New expiration date: Nov 30,2028 FACILITY SUMMARY Aqua North Carolina,Inc. operates a wastewater treatment plant for an estimated 249 residents. Willowbrook Subdivision WWTP is a minor 100%domestic facility(flow< 1 MGD)with a design capacity and permitted wastewater discharge of 0.048 MGD. The original NPDES permit for this facility was issued in September 1988. This facility utilizes the following treatment components: • Bar screen • Aeration basin • Clarifier • Tablet chlorination w/contact tank Fact Sheet for Permit Renewal Jan 2024-NPDES Permit NCO073539-Page 1 DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A • Dechlorination • Aerated sludge holding tank • Continuous flow measurement • Composite sampler • Auxillary power back up w/automatic transfer switch • Aerated flow equalization tank RENEWAL SUMMARY This renewal contains the following changes: • Updated the Supplement to Permit Cover Sheet by adding the aerated flow equalization tank to the treatment components section. • Added revised ammonia limits,based on the IWC calculations and 2016 N-13 guidance document, that will take effect on 1/l/2028. These revised limits include, a monthly summer limit of 2 mg/L, a daily summer limit of 10 mg/L, a monthly winter limit of 5 mg/L, and a daily winter limit of 25 mg/L. This change is shown in the table in Part I.A. (1). • Updated eDMR language for electronic data submission in Part I. A. (2). • Regional Office staff approved the draft permit. COMPLIANCE HISTORY Willowbrook Subdivision WWTP has had no enforcements since July 2016. The facility has had no NOVs or NODS since the last permit was issued in February 2019.Most recent inspection(November 2021) showed the facility to be in compliance. COMMENTS ON DRAFT PERMIT • Joseph Pearce(Chief of Operations and Engineering,Aqua North Carolina,Inc.)commented on the permit limit changes in the draft and requested a review of the previous and new IWC calculations, the 2016 Guidance Documents, and Fact Sheet for the permit. All documents were attached to the comment response that included the following summary: According to the historical compilation of documents on laserfiche the ammonia summer and winter monthly average limits were 2.0 and 5.0 mg/L respectively in the 2003-2008 permit and then were changed to the current 11.0 mg/L summer limit in the 2008-2013 permit; however,I can't find any information on why that change occurred.We don't typically increase the limit due to antibacksliding policies that prohibit the relaxation of effluent limitations in reissued permits. According to the IWC calculation included, the current 7Q 10 winter and summer values, and the 2016 ammonia permitting guidance the limits need to be 2.0 and 5.0 mg/L for ammonia summer and winter monthly average limits respectively. As shown in the draft permit,DWR has agreed that the revised ammonia limits will take effect l/l/2028 in order to help the facility make these new ammonia limits. Fact Sheet for Permit Renewal Jan 2024-NPDES Permit NCO073539-Page 2 DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A IWC Calculations Facility:Willowbrook Subdivision WWTP Permit No.: NC0073539 Prepared By: Caroline Robinson Enter Design Flow(MGD): 0.048 <= Permitted Flow if Different from Design Enter s7Q10(cfs): 0.075 Enter w7Q10(cfs): 0.15 Total Residual Chlorine(TRC) Ammonia(Summer) Daily Maximum Limit(ug/1) Monthly Average Limit(mg NH3-N/1) Design Permitted Design Permitted s7Q10(CFS) 0.075 € s7Q10 (CFS) 0.075 DESIGN FLOW(MGD) 0.048 DESIGN FLOW (MGD) 0.048 DESIGN FLOW(CFS) 0.0744 € DESIGN FLOW(CFS) 0.0744 STREAM STD(UG/L) 17.0 STREAM STD (MG/L) 1.0 Upstream Bkgd (ug/1) 0 Upstream Bkgd (mg/1) 0.22 IWC(%) 49.80 € IWC(%) 49.80 Allowable Conc. (ug/1) 34 Allowable Conc.(mg/1) 1.8 < 1 MGD Policy Applies Ammonia(Winter) Monthly Average Limit(mg NH3-N/1) Design Permitted Design Permitted Fecal Coliform w7Q10(CFS) 0.15 Monthly Average Limit: 200/100ml #VALUE! DESIGN FLOW(MGD) 0.048 (If DF>331; Monitor) DESIGN FLOW (CFS) 0.0744 (If DF<331; Limit) STREAM STD(MG/L) 1.8 Dilution Factor(DF) 2.01 s #VALUE! Upstream Bkgd (mg/1) 0.22 IWC(%) 33.16 Allowable Conc. (mg/1) 5.0 *213 .0404(c)Applies Total Residual Chlorine 1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity Ammonia (as NH3-N) 1. If Allowable Conc>35 mg/I, Monitor Only 2. Monthly Avg limit x 3=Weekly Avg limit(Municipals) 3. Monthly Avg limit x 5= Daily Max limit(Non-Munis) If the allowable ammonia concentration is>35 mg/L, no limit shall be imposed •By Policy dischargers< 1 MGD get limits no lower than 2&4 due to BAT • From 2B .0404(c)-Winter Limits can be no less stringent than 2 times the summer limits Fecal Coliform 1. Monthly Avg limit x 2=400/100 ml =Weekly Avg limit(Municipals)=Daily Max limit(Non-Muni) DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A Permit Enforcement History by Permit Permit: NC0073539 Facility: Willowbrook Subdivision WWTP Owner: Aqua North Carolina Inc Region: Mooresville County: Mecklenburg Penalty Remission Enforcement EMC Collection Has Assessment Penalty Enforcement Request Conference Hearing Memo Sent Payment Case Case Approved Amount Costs Damages Received Held Held To AGO Total Paid Balance Due Plan Closed LM-1991-0006 10/04/91 $4,600.00 $487.97 $0.00 10/31/91 12/04/91 02/13/92 $0.00 $5,087.97 No 05/09/16 LM-1998-0057 11/30/98 $1,150.00 $357.63 07/19/99 $753.82 $0.00 No 06/18/99 LV-2000-0001 01/07/00 $250.00 $73.33 $323.33 $0.00 No 02/07/00 LM-2001-0028 03/05/02 $3,225.00 $490.35 $3,715.35 $0.00 No 04/12/02 PC-2016-0045 07/20/16 $500.00 $100.00 08/24/16 10/04/16 $600.00 $0.00 No 10/31/16 Total Cases: 5 $9,725.00 $1,509.28 $5,392.50 $5,087.97 Total Penalties: $11,234.28 Total Penalties after $10,480.47 DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A MONITORING REPORT(MR)VIOLATIONS for: Report Date: 10/10/22 Page 1 of 3 Permit: NCO073539 MRS Betweel 2 - 2019 and10 - 2023 Region: % Violation Category:Limit Violation Program Category: NPDES WW Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:% Major Minor: % PERMIT: NCO073539 FACILITY: Aqua North Carolina Inc-Willowbrook Subdivision COUNTY: Mecklenburg REGION: Mooresville WWTP Limit Violation MONITORING VIOLATION UNIT OF CALCULATED % REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION 04-2020 001 Effluent Chlorine,Total Residual 04/23/20 2 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ Exceeded 06-2020 001 Effluent Chlorine,Total Residual 06/25/20 2 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ Exceeded 09-2020 001 Effluent Chlorine,Total Residual 09/03/20 2 X week ug/I 28 31 10.7 Daily Maximum No Action, BPJ Exceeded 03-2021 001 Effluent Chlorine,Total Residual 03/15/21 2 X week ug/I 28 36 28.6 Daily Maximum No Action, BPJ Exceeded 04-2021 001 Effluent Chlorine,Total Residual 04/28/21 2 X week ug/I 28 37 32.1 Daily Maximum No Action, BPJ Exceeded 06-2021 001 Effluent Chlorine,Total Residual 06/23/21 2 X week ug/I 28 35 25 Daily Maximum No Action, BPJ Exceeded 09-2021 001 Effluent Chlorine,Total Residual 09/08/21 2 X week ug/I 28 42 50 Daily Maximum No Action, BPJ Exceeded 01-2022 001 Effluent Chlorine,Total Residual 01/20/22 2 X week ug/I 28 29 3.6 Daily Maximum No Action, BPJ Exceeded 02-2022 001 Effluent Chlorine,Total Residual 02/28/22 2 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ Exceeded 04-2022 001 Effluent Chlorine,Total Residual 04/19/22 2 X week ug/I 28 40 42.9 Daily Maximum No Action, BPJ Exceeded 05-2022 001 Effluent Chlorine,Total Residual 05/31/22 2 Xweek ug/I 28 34 21.4 Daily Maximum No Action, BPJ Exceeded 07-2022 001 Effluent Chlorine,Total Residual 07/07/22 2 X week ug/I 28 39 39.3 Daily Maximum No Action, BPJ Exceeded 07-2022 001 Effluent Chlorine,Total Residual 07/12/22 2 X week ug/I 28 35 25 Daily Maximum No Action, BPJ Exceeded 07-2022 001 Effluent Chlorine,Total Residual 07/26/22 2 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ Exceeded 10-2022 001 Effluent Chlorine,Total Residual 10/20/22 2 X week ug/I 28 37 32.1 Daily Maximum No Action, BPJ Exceeded DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A MONITORING REPORT(MR)VIOLATIONS for: Report Date: 10/10/22 Page 2 of 3 Permit: NCO073539 MRS Betweel 2 - 2019 and10 - 2023 Region: % Violation Category:Limit Violation Program Category: NPDES WW Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:% Major Minor: % PERMIT: NCO073539 FACILITY: Aqua North Carolina Inc-Willowbrook Subdivision COUNTY: Mecklenburg REGION: Mooresville WWTP Limit Violation MONITORING VIOLATION UNIT OF CALCULATED % REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION 11-2022 001 Effluent Chlorine,Total Residual 11/15/22 2 X week ug/I 28 38 35.7 Daily Maximum No Action, BPJ Exceeded 12-2022 001 Effluent Chlorine,Total Residual 12/08/22 2 X week ug/I 28 35 25 Daily Maximum No Action, BPJ Exceeded 12-2022 001 Effluent Chlorine,Total Residual 12/16/22 2 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ Exceeded 01-2023 001 Effluent Chlorine,Total Residual 01/10/23 2 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ Exceeded 01-2023 001 Effluent Chlorine,Total Residual 01/24/23 2 X week ug/I 28 37 32.1 Daily Maximum No Action, BPJ Exceeded 01-2023 001 Effluent Chlorine,Total Residual 01/26/23 2 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ Exceeded 02-2023 001 Effluent Chlorine,Total Residual 02/24/23 2 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ Exceeded 03-2023 001 Effluent Chlorine,Total Residual 03/14/23 2 X week ug/I 28 38 35.7 Daily Maximum No Action, BPJ Exceeded 03-2023 001 Effluent Chlorine,Total Residual 03/21/23 2 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ Exceeded 03-2023 001 Effluent Chlorine,Total Residual 03/29/23 2 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ Exceeded 04-2023 001 Effluent Chlorine,Total Residual 04/13/23 2 X week ug/I 28 36 28.6 Daily Maximum No Action, BPJ Exceeded 05-2023 001 Effluent Chlorine,Total Residual 05/09/23 2 X week ug/I 28 39 39.3 Daily Maximum No Action, BPJ Exceeded 05-2023 001 Effluent Chlorine,Total Residual 05/17/23 2 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ Exceeded 05-2023 001 Effluent Chlorine,Total Residual 05/18/23 2 X week ug/I 28 43 53.6 Daily Maximum No Action, BPJ Exceeded 05-2023 001 Effluent Chlorine,Total Residual 05/23/23 2 X week ug/I 28 48 71.4 Daily Maximum No Action, BPJ Exceeded 05-2023 001 Effluent Chlorine,Total Residual 05/31/23 2 Xweek ug/I 28 48 71.4 Daily Maximum No Action, BPJ Exceeded DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A MONITORING REPORT(MR)VIOLATIONS for: Report Date: 10/10/22 Page 3 of 3 Permit: NCO073539 MRS Betweel 2 - 2019 and10 - 2023 Region: % Violation Category:Limit Violation Program Category: NPDES WW Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:% Major Minor: % PERMIT: NCO073539 FACILITY: Aqua North Carolina Inc-Willowbrook Subdivision COUNTY: Mecklenburg REGION: Mooresville WWTP Limit Violation MONITORING VIOLATION UNIT OF CALCULATED % REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION 06-2023 001 Effluent Chlorine,Total Residual 06/15/23 2 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ Exceeded 06-2023 001 Effluent Chlorine,Total Residual 06/27/23 2 X week ug/I 28 43 53.6 Daily Maximum No Action, BPJ Exceeded 07-2023 001 Effluent Chlorine,Total Residual 07/05/23 2 X week ug/I 28 49 75 Daily Maximum No Action, BPJ Exceeded 07-2023 001 Effluent Chlorine,Total Residual 07/06/23 2 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ Exceeded 07-2023 001 Effluent Chlorine,Total Residual 07/20/23 2 X week ug/I 28 43 53.6 Daily Maximum No Action, BPJ Exceeded 07-2023 001 Effluent Chlorine,Total Residual 07/24/23 2 X week ug/I 28 31 10.7 Daily Maximum No Action, BPJ Exceeded 07-2023 001 Effluent Chlorine,Total Residual 07/25/23 2 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ Exceeded 08-2023 001 Effluent Chlorine,Total Residual 08/08/23 2 X week ug/I 28 37 32.1 Daily Maximum No Action, BPJ Exceeded 08-2023 001 Effluent Chlorine,Total Residual 08/23/23 2 X week ug/I 28 38 35.7 Daily Maximum No Action, BPJ Exceeded 08-2023 001 Effluent Chlorine,Total Residual 08/29/23 2 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ Exceeded 08-2023 001 Effluent Chlorine,Total Residual 08/31/23 2 X week ug/I 28 36 28.6 Daily Maximum No Action, BPJ Exceeded DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A News-DemocratBe2UfOFt Gazette The Herald-P�xlk Hill el Nuevo Herald-Miami Sun News;-Myrtle Beach Belleville Durham DailyBell ingham Herald Idaho Statesman Paleiigh News&Observer The Telegraph-Macon Bradenton Herald Island Packiet The Olympian San Luis Obispo Tribune J&KMC,'CLATC,'HY Centre Charlotte Observer Lexington Herald-Leader Fort VlAyth Star-Telegram Wichita Eagle Columbus Ledger-Enquire r Merced Sun-Star The Strb2-GDlu mbia Fresno Bee Miami Herald Sun Herald-Biloxi AFFIDAVIT OF PUBLICATION Account# Order Number Identification Order Po Amount Cols Depth 28386 482734 Print Legal Ad-IPL01451280-IPLO145128 $644.38 2 26 L Attention: Wren Thedford North Carolina } Ss NCDENR/DWO/POINT SOURCE Mecklenburg County } 1617 MAIL SERVICE CENTER Before the undersigned,a Notary Public of said RALEIGH,NC 276991671 County and State,duly authorized to administer wren.thedford@ncdenr.gov oaths affirmations,etc.,personally appeared, being duly sworn or affirmed according to law, ---------------------------------------------------------------------------- Public Notice cloth depose and say that he/she is a North Carolina Environmental Management Commission/NPDES Unit representative of The Charlotte Observer 1617 Mail Service Center Publishing Company,a corporation organized and Raleigh,NC 27699-1617 doing business under the laws of the State of Notice of Intent to Issue a NPDES Wastewater Permit NCO073539 Willowbrook Delaware,and publishing a newspaper known as Subdivision WWTP The North Carolina Environmental Management Commission proposes to issue a NPDES wastewater discharge permit to the person(s)listed The Charlotte Observer in the city of Charlotte, below. Written comments regarding the proposed permit will be accepted until County of Mecklenburg,and State of North 30 days after the publish date of this notice.The Director of the NC Division of y Water Resources(DWR)may hold a public hearing should there be a significant Carolina and that as such he/she is familiar with degree of public interest.Please mail comments and/or information requests to DWR at the above address.Interested persons may visit the DWR at 512 N.Salis- the books,records,files,and business of said bury Street,Raleigh,NC 27604 to review the information on file. Additional infor- mation on NPD Ord y ES permits and this notice may be found on our website:https:// p deq.nc.gov/public-notices-hearings,or by calling (919)707-3601. Aqua North publication,the attached advertisement was Carolina,Inc.applied to renew NPDES permit NCO073539 for the Willowbrook Subdivision WWTP (12309 Ramah Creek Court, Huntersville) in Mecklenburg inserted.The following is correctly copied from County.This facility discharges to Ramah Creek in the Yadkin-Pee Dee River the books and files of the aforesaid Corporation Basin.Currently biochemical oxygen demand (BOD),ammonia nitrogen,dis- p solved oxygen,fecal coliform,and total residual chlorine(rRC)are water quality and Publication. limited.This discharge may affect future wasteload allocations in this portion of Ramah Creek. IPLO145128 1 insertion(s)published on: Oct 25 2023 10/25/23 f In Testimony Whereof I have hereunto set my hand and affixed my seal on the 25th day of October,2023 Notary Public in and for the state of Texas,residing in Dallas County �'`' "'• STEPHANIEHIATCHER jt = ,- ; x: •- My Notary ID#1335YAOO Fjorss January 14,2026 Extra charge for lost or duplicate affidavits. Legal document please do not destroy! DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A From: Bell.Wes To: Pitner,Andrew Cc: Robinson.Caroline Subject: RE: Draft Permit Review NCO073539 Date: Thursday,October 12,2023 3:57:17 PM Attachments: imaoe002.ona imaae003,ona Good afternoon Caroline, Permit looks good to me! Wes Wes Bell Env. Specialist II Mooresville Regional Office Water Quality Regional Operations Section NCDEQ-Division of Water Resources (704) 663-1699 Office (704) 235-2192 Office Direct Line Email: wes.bell Pdeq.nc.gov 610 East Center Avenue Suite 301 Mooresville, NC 28115 NORTH CAROLINn Department of Environmental Quality Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Pitner, Andrew<andrew.pitner@deq.nc.gov> Sent:Thursday, October 12, 2023 3:30 PM To: Bell, Wes<wes.bell@deq.nc.gov> Cc: Robinson, Caroline<caroline.robinson@deq.nc.gov> Subject: FW: Draft Permit Review NCO073539 Hey Wes, Please review for MRO and respond to Caroline with any comments. Thanks, DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A Andrew Andrew Pitner, P.G. -Andrew.Pitner(a)ncdenr.gov Division of Water Resources - Water Quality Regional Operations Mooresville Regional Office (MRO) North Carolina Department of Environment& Natural Resources 610 East Center Avenue, Suite 301, Mooresville, NC 28115 MRO Main Phone: (704) 663-1699 Direct Office Phone: (704) 235-2180 MRO Fax: (704) 663-6040 DWR website: http://www.ncwater.org NOTICE: Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties unless the content is exempt by statute or other regulation. From: Robinson, Caroline<caroline.robinsonPdeq.nc.gov> Sent:Thursday, October 12, 2023 2:56 PM To: Pitner, Andrew<andrew.pitner(@deq.nc.g_ov>;Talbott,Jeffrey<ieffrey.talbott(@deq.nc.gov> Cc: Scheller, Roberto<roberto.scheller(@deq.nc.gov> Subject: Draft Permit Review NCO073539 Hi Andrew and Jeffrey, The NCO073539 draft permit renewal is ready for review! The draft permit renewal for Willowbrook Subdivision WWTP (NC0073539) will go to Notice on 10/24/2023. Please send me any comments as time permits. Thanks, Caroline Caroline Robinson (she/her/hers) Environmental Specialist ll, Division of Water Resources North Carolina Department of Environmental Quality Office: (919) 707-9130 / Cell: (757)818-3696 caroline.robinson(@deq.nc.gov NORTH CAROLINA - Department of Environmental Quality Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized state official. DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A From: Robinson,Caroline To: Pearce,Joseph R Cc: Watkins,Deborah M; Becker,Shannon V Subject: RE: [External]RE: Draft NPDES permit NCO073539 Date: Tuesday,December 19,2023 12:19:00 PM Attachments: IWC Calculations 73539.Ddf imaae005.Dna imaae006.Dna image007.Dng imaae008.Dna imaae009.Dna NCO073539 Draft FactSheet 2023.Ddf Ammonia Permitting Guidance 2016.Ddf NCO073539 Draft Permit 2023.Ddf Hi Joe, I am working on finalizing this permit for signature and I noticed that although I thought Charles Weaver responded to this email, he did not include the attachments you asked for! We don't typically do in person file reviews since all of the documents can be found online through Laserfiche, NCO073539 or through the attachments I included with this email. According to the historical compilation of documents (found at the previous link) the ammonia summer and winter monthly average limits were 2.0 and 5.0 mg/L respectively in the 2003-2008 permit and then were changed to the current 11.0 mg/L summer limit in the 2008-2013 permit; however, I can't find any information on why that change occurred. We don't typically increase the limit due to anti- backsliding policies that prohibit the relaxation of effluent limitations in reissued permits. According to the IWC calculation included, the current 7Q10 winter and summer values, and the 2016 ammonia permitting guidance the limits need to be 2.0 and 5.0 mg/L for ammonia summer and winter monthly average limits respectively. As shown in the draft permit, DWR has agreed that the revised ammonia limits will take effect 1/1/2028 in order to help the facility make these new ammonia limits. Please let me know if you have any questions or concerns and again sorry for my delayed response. Thanks, Caroline Caroline Robinson (she/her/hers) Environmental Specialist ll, Division of Water Resources North Carolina Department of Environmental Quality Office: (919) 707-9130 / Cell: (757)818-3696 caroline.robinsonC@deq.nc.g_ov DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A ki ;NORTH CAROLINA �EQ Department of Environmental Quality Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Pearce,Joseph R<JRPearce@aquaamerica.com> Sent:Tuesday, October 31, 2023 12:05 PM To: Robinson, Caroline<caroline.robinson@deq.nc.gov> Cc: Watkins, Deborah M <DMWatkins@essential.co>; Becker, Shannon V <SVBecker@aquaamerica.com> Subject: [External] RE: Draft NPDES permit NCO073539 CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message button located on your Outlook menu bar on the Home tab. Good Morning Ms. Robinson, We have received the draft permit, NC0073359. Typically, with permit limit changes we are given the opportunity to review the proposed changes prior to public notice. To my knowledge, we were not provided that opportunity with this permit. I am requesting to review the previous and new IWC calculations,the 2016 Guidance Documents, and the Fact Sheet for this permit. Was a new 70.10 established? I can be reached by cellphone at (919)605-6991 to schedule a file review in the Archdale building. Thank you, Joe AOUAII Joseph Pearce PE CFM Chief of Operations and Engineering Aqua North Carolina,Inc. 202 MacKenan Court Cary,North Carolina 27511 0: 919.653.6964 F:919.460.1788 coo DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A PAT MCCRORY Governor DONALD R. VAN DER VAART secremry Water Resources ENVIRONMENTAL QUALITY S. JAY ZIMMEi RMAN Director Memorandum To: NPDES Complex Unit From: Tom Belnick Date: July 20, 2016 Subject: NPDES Permitting Guidance NPDES Implementation of Ammonia Criteria-Update NC has still not adopted an ammonia standard, though it is on our WQS Triennial List for next round. NC did establish ammonia chronic criteria for use in NPDES permitting back in 1989/90, which was based on EPA's 1986 criteria development document that factored in pH/Temp across three regions of the State (see attached). This evaluation resulted in ammonia chronic criteria of 1.0 mg/l NH3-N (summer) and 1.8 mg/l NH3-N (winter) for use in permitting purposes. NC implements these chronic criteria as Monthly Averages limits utilizing instream dilution. In 2002,NC developed procedures for complimentary acute permit limits (discussed below). The current ammonia permitting procedures should be as follows: • The NH3/TRC Wasteload Allocation(WLA) spreadsheet automatically calculates appropriate ammonia Monthly Average limits for summer and winter. The spreadsheet assumes a background ammonia concentration of 0.22 mg/1. • For any permit (new/renewal), always run the NH3/TRC WLA spreadsheet to verify appropriate Monthly Average Ammonia Limits for protection of aquatic life. • If the allowable ammonia concentration is greater than 35 mg/l,no limit should be imposed. • If the allowable concentration is less than 35 mg/1,then the allowable limit is needed and the spreadsheet will automatically calculate it. • For Municipal facilities,the acute limit will be expressed as a Weekly Average, and is based on multiplying the Monthly Average limit by a factor of 3. • For non-Municipal facilities,the acute limit will be expressed as a Daily Maximum, and is based on multiplying the Monthly Average limit by a factor of 5. • If a new more stringent ammonia limit is required, discuss the need for a Compliance Schedule with senior staff and then with the Permitee. • There is no RPA procedure used for ammonia; it is implemented strictly based on WLA spreadsheet results (similar to TRC). State of North Carolina I Environmental Quality I Water Resources 1617 Mail Service Center I Raleigh,North Carolina 27699-1617 919 707 9000 DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A Page 12 • A sample NH3/TRC WLA is attached. In this example, the spreadsheet indicates that Monthly Average ammonia limits of 3.2 mg/1 and 12.7 mg/1 should be imposed for summer and winter, respectively, in order to protect for NC's chronic ammonia criteria. Some additional considerations: • This guidance will need to be revisited after NC formally adopts an ammonia standard for both chronic and acute aquatic life protection. • In the past, some ammonia limits were based strictly on protection of our DO standard rather than ammonia toxicity, and that is why the permit writer should always verify the correct ammonia limit with any permit renewal using the WLA spreadsheet. • In the past, some practices allowed for maintaining a less stringent ammonia limit if the facility was consistently passing the WET test(i.e., biology trumps chemistry). This is no longer a valid approach and EPA would object. In April 2016 EPA expressly stated that NC cannot use biology to override chemical results. EPA also disallowed the use of Action Levels in permitting, in which toxicity test results (if passing) were used to override the need for permit limits for copper/zinc/silver/iron/chloride. DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A i _ ' • AMMONxA CRXTERTA TABLES (NH3 as N) Based on EPA recommended 4-day maximum average concent.ration criteria - r j - Mountains and Trout 'Wdters I EMPE URE H °C 2 C 6.8 025 0 31 U xo ed o, at 7. 0. 5 mg/01 s TEMPERATURE H 12°C 23°C . 6.8 1.8084 1.0028 Total Ammonia 7.5 1•.8084 1.0111 (mg/l NH3 as N) <`- (:Piddmont Freshwaters T MPE TUFF 5 fi °C r F 26° Af � �0136 b.:00A4 n=xor�`' � u�ed' oni� 7. 0. 44 ..,.`� :01`4 .:; � /1 xNH3 as ) 4 = d ,, TEMPERATURE H 14°C 260C 6.8 1.8084 1.1344 Total Ammonia 7.5 1.8084 1.1541 (mg/1 NH3 as N) 'r Coastal Plain and Sandhills Freshwaters ' f T MP r RA�tPU { •- H 1C 8° i W5W 0. 0V 0 0 4 (Aftlm ri414� o��ia 6 0.'02 gV d �a TEMPERATURE H 160C 28°C 6.8 1.7920 0.9700 Total Ammonia 7.5 1.7920 0.9864 (mg/1 •NH3 as N) • r UV E Somal 10/19/89 } ` t®0 DocuSign Envelope ID:2D58E04C-202E-44FB-9FFC-1CF1970B553A NH3/TRC WLA Calculations Facility: Anywhere USA NC00 Prepared By: Tom Belnick Enter Design Flow(MGD): 0.03 Enter s7Q10 (cfs): 0.13 Enter w7Q10 (cfs): 0.32 Total Residual Chlorine(TRC) Ammonia (Summer) Daily Maximum Limit(ug/1) Monthly Average Limit(mg NH3-N/1) s7Q10 (CFS) 0.13 s7Q10 (CFS) 0.13 DESIGN FLOW(MGD) 0.03 DESIGN FLOW(MGD) 0.03 DESIGN FLOW(CFS) 0.0465 DESIGN FLOW(CFS) 0.0465 STREAM STD (UG/L) 17.0 STREAM STD (MG/L) 1.0 Upstream Bkgd (ug/1) 0 Upstream Bkgd (mg/1) 0.22 IWC (%) 26.35 IWC (%) 26.35 Allowable Cone. (ug/1) 65 Allowable Cone. (mg/1) 3.2 Ammonia (Winter) Monthly Average Limit(mg NH3-N/1) Fecal Coliform w7Q10 (CFS) 0.32 Monthly Average Limit: 200/100mi DESIGN FLOW(MGD) 0.03 (If DF >331; Monitor) DESIGN FLOW(CFS) 0.0465 (If DF<331; Limit) STREAM STD (MG/L) 1.8 Dilution Factor(DF) 3.80 Upstream Bkgd (mg/1) 0.22 IWC (%) 12.69 Allowable Cone. (mg/1) 12.7 Total Residual Chlorine 1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity Ammonia (as NH3-N) 1. If Allowable Conc> 35 mg/l, Monitor Only 2. Monthly Avg limit x 3 = Weekly Avg limit(Municipals); capped at 35 mg/I 3. Monthly Avg limit x 5 = Daily Max limit(Non-Munis); capped at 35 mg/I Fecal Coliform 1. Monthly Avg limit x 2 =400/100 ml= Weekly Avg limit(Municipals) = Daily Max limit(Non-Muni) From: Lambeth,Robyn E To: Robinson.Caroline Cc: Pearce,Joseph R Subject: RE: [EXTERNAL]NPDES Permit Issuance NCO073539 Date: Wednesday,February 28,2024 9:13:25 AM Attachments: imaae001.ona CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message button located on your Outlook menu bar on the Home tab. Hi Caroline, The Willowbrook permit has been received. Robyn From: Robinson, Caroline<caroline.robinson@deq.nc.gov> Sent:Tuesday, February 27, 2024 3:51 PM To: Lambeth, Robyn E<relambeth@aquaamerica.com>; Pearce,Joseph R <jrpearce@aquaamerica.com> Subject: [EXTERNAL] NPDES Permit Issuance NCO073539 CAUTION:This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Good Afternoon! I've attached a PDF of the permit issuance and fact sheet for NCO073539 /Willowbrook Subdivision WWTP. Please respond to this email to confirm you have downloaded a copy for your records. Let me know if you have any questions or if you need a hard copy of the permit mailed to you! Thanks, Caroline Caroline Robinson (she/her/hers) Environmental Specialist 11, Division of Water Resources North Carolina Department of Environmental Quality Office: (919) 707-9130 / Cell: (757)818-3696 caroline.robinson(@deq.nc.gov NORTH CAROLINA E Q Department of Environmental Quality Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized state official.