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HomeMy WebLinkAboutNC0042439_Draft Fact Sheet_20240430NCDEQ / DWR / NPDES EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL NPDES Permit NCO042439 Caroline Robinson / Compliance & Expedited Permitting Unit / caroline.robinsongdeq.nc. og_v / April 2024 FACILITY INFORMATION Applicant/Facility Name Westside Swim & Racquet Club (Laura Shaffer) Westside Swim & Racquet Club WWTP Applicant Address/Mailing Address P.O. Box 895, Salisbury, NC 28145 Facility Physical Address 630 Neel Road, Salisbury, NC 28145 Permitted Flow (MGD) 0.003 MGD Type of Waste 100% Domestic, < 1 MGD Facility Class WW-2 County Rowan Permit Status Renewal Regional Office MRO STREAM CHARACTERISTICS Receiving Stream Draft Branch Stream Classification C Stream Segment 12-110-4 Outfall Lat. 350 40' 06" N 7Q10 - Summer (cfs) 0.15 Outfall Long. 800 33' 41" W 7Q10 - Winter (cfs) 0.3 Drainage basin Yadkin Pee -Dee River Basin 30Q2 (cfs) 0.4 Subbasin 03-07-04 Average Flow (cfs) 1.4 HUC 030401030101 IWC (%) 3.01% (summer) / 1.53% (winter) 303(d) List No BASIC INFO FOR EXPEDITED PERMIT RENEWAL Yes — added Ammonia Nitrogen limits for the summer months (April 1 — October 31) based on the IWC calculations and 2016 NH3 guidance document. The Does permit need Daily Max NH3 limits? monthly average summer limit for NH3 as N will be 26.2 mg/L and the summer daily maximum limit for NH3 as N will be 35 mg/L. The changes can be found in Part L A. (1.). 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? Yes — Nutrient Reopener for High Rock Lake Does permit have instream monitoring? No New expiration date: June 30, 2029 FACILITY SUMMARY Westside Swim & Racquet Club operates a 100% domestic wastewater treatment plant for an estimated 250 people. Westside Swim & Racquet Club WWTP is a minor facility (flow < 1 MGD) with a design capacity and permitted wastewater discharge of 0.003 MGD. The WWTP was originally permitted in January 1979. The treatment facility is only operated during the summer months and discharge from the facility is sporadic. This facility utilizes the following treatment components: • Aeration basin with diffused air • Clarifier • Table chlorination Fact Sheet for Permit Renewal April 2024 - NPDES Permit NCO042439 - Page 1 • Chlorination contact basin • Dechlorination • Post aeration RENEWAL SUMMARY This renewal contains the following changes: • Added the monthly average and daily maximum NH3 as N effluent limits for the summer months (April I — October 31) for 0.003 MGD flow based on the IWC calculations and 2016 NH3 guidance document. The monthly average summer limit for NH3 as N will be 26.2 mg/L and the summer daily maximum limit will be 35 mg/L. The changes can be found in Part L A. (I.). • Updated Section A. (3) to reflect current federal requirements for Electronic Reporting of Discharge Monitoring Reports. COMPLIANCE HISTORY Westside Swim & Racquet Club WWTP has had no enforcements on record since 2008. The facility has had no NOVs. Most recent inspection (February 2020) showed the facility to be in compliance. COMMENTS ON DRAFT PERMIT • Jeffrey Talbott (Operator Certification Group) noted: o Please note that NCO042439 is classified as a WW/Bio-II facility in BIMS, with Backup ORC Daniel Gatewood (Cert # 22457) and Backup ORC Todd Robinson (Cert # 989809) currently holding "Backup" status as operators for the facility, with no ORC listed. Per 15A NCAC 08G .0201— Responsibility of System Owners to Designate Certified Operators: Owners of classified water pollution control systems shall designate operators certified by the Commission of the same type and grade as the classification for the system and for each classification shall: designate one ORC who possesses a valid certificate of the type and grade at least equivalent to the type and grade of the system; designate one or more Back-up ORC(s) who possesses a valid certificate of the type of the system and no more than one grade less than the grade of the system, with the exception of no Back-up ORC is required for systems whose minimum visitation requirements are twice per year Our forms for ORC — Operator Designation & Resignation can be found at the following link: https://www.deg.nc.gov/about/divisions/water-resources/operator- certification/wastewater-operator/downloads-links Fact Sheet for Permit Renewal April 2024 - NPDES Permit NCO042439 - Page 2 IWC Calculations Facility: Westside Swim & Racquet Club WWTP Permit No.: NC0042439 Prepared By : Caroline Robinson Enter Design Flow (MGD): 0.003 <= Permitted Flow if Different from Design Enter s7Q10 (cfs): 0.15 Enter w7Q10 (cfs): 0.3 Total Residual Chlorine (TRC) Ammonia (Summer) Daily Maximum Limit (ug/1) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted s7Q10 (CFS) 0.15 s7Q10 (CFS) 0.15 DESIGN FLOW (MGD) 0.003 DESIGN FLOW (MGD) 0.003 DESIGN FLOW (CFS) 0.00465 DESIGN FLOW (CFS) 0.00465 STREAM STD (UG/L) 17.0 STREAM STD (MG/L) 1.0 Upstream Bkgd (ug/I) 0 Upstream Bkgd (mg/1) 0.22 IWC (%) 3.01 IWC (%) 3.01 Allowable Conc. (ug/1) 565 Allowable Conc. (mg/1) 26.2 Ammonia (Winter) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted Fecal Coliform w7Q10 (CFS) 0.3 Monthly Average Limit: 200/100ml #VALUE! DESIGN FLOW (MGD) 0.003 (If DF >331; Monitor) DESIGN FLOW (CFS) 0.00465 (If DF<331; Limit) STREAM STD (MG/L) 1.8 Dilution Factor (DF) 33.26 #VALUE! Upstream Bkgd (mg/1) 0.22 IWC (%) 1.53 Allowable Conc. (mg/1) 103.7 *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/l, 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) 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/l, 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 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. AMMONIA CRTTERTA TABLES (NH3 as N) Based on EPA recommended 4-day maximum average concent.ration criteria (Mou'ntain'sand Trout Waters TEMPERATURE H 120C 230C . 6.8 1.8084 1.0028 Total Ammonia 7.5 1,.8084 1.0111 (mg/l NH3 as N) Pie•dmon:t Freshwaters r TEMPERATURE H 140C 2 60C 6.8 1.8084 1.1344 Total Ammonia 7.5 1.8084 1.1541 (mg/1 NH3 as N) Coastal Plain and Sandhills Freshwaters TEMPERATURE H 160C 280C 6.8 1.7920 0.9700 Total Ammonia 7.5 1.7920 0.9864 (mg/1•NH3 as N) S Ex 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/I, 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) 00 O 00 o N O O U o 0 c m c R E R o z 0 z _ a IL � m o o o c0 n U o 0 0 r- D u> a R m r R m 06 E :2 rn ao rn ao o n U) a w w -o o CD >N w ++ O (/) 3 d O Q f6 N O N F . 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