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Home My WebLink AboutNC0075515_Fact Sheet_20230725Boomer NCDEQ / DWR / NPDES EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL NPDES Permit NCO075515 Catherine Shadwell, Compliance & Expedited Permitting Unit / (919)707-3613 July 2023 FACILITY INFORMATION Applicant/Facility Name Wilkes County Schools Boomer Ferguson Elementary School WWTP Applicant Address 613 Cherry Street North Wilkesboro, NC 28659 Facility Physical Address/Mailing Address 556 Boomer -Ferguson School Rd. Boomer, NC 28606 Permitted Flow (MGD) 0.003 MGD Type of Waste 100% Domestic, < 1 MGD Facility Class WW-1 County Wilkes Permit Status Renewal Regional Office WSRO STREAM CHARACTERISTICS Receiving Stream UT Warrior Creek Stream Classification WS-IV Stream Segment 12-29-(0.7) Outfall Lat. 360 06' 01" N 7Q 10 - Summer (cfs) 0.07 Outfall Long. 810 1747" W 7Q10 - Winter (cfs) 0.1 Drainage basin Yadkin Pee Dee 30Q2 (cfs) 0.14 Subbasin 03-07-01 Average Flow (cfs) 0.23 HUC 030401010203 IWC (%) Summer — 6.23% Winter — 4.44% 303(d) List Not listed. BASIC INFO FOR EXPEDITED PERMIT RENEWAL Does permit need Daily Max NH3 limits? Already present in permit Does permit need TRC limits/footnote? Already present in permit Does permit have toxicity testing? No Does permit have any Special Conditions? Yes, high rock lake nutrient reopener Does permit have instream monitoring? no Few expiration date: Sep 30, 2028 Facility Summary Wilks County Schools operate Boomer Ferguson Elementary School which houses 215 students and faculty that has a minor WWTP with a design capacity of 0.003 MGD. The permit for this facility was originally issues in 1989. • Septic tank • Dosing tank • Two surface sand filters • Calcium hypochlorite disinfection • Sodium sulfite dechlorination Renewal Summary This renewal contains the following changes: • Updated the effluent table in Section A. (1.) with eDMR parameter codes. • Updated Section A. (3.) to reflect current federal requirements for Electronic Reporting of Discharge Monitoring Reports. • Added regulatory citations. Fact Sheet for Permit Renewal July 2023 - NPDES Permit NCO075515 - Page 1 • Updated outfall map Compliance History Looking back to 2018 — present, Boomer Ferguson Elementary School WWTP has only had 2 violations, and both were in 2020. Most recent inspection performed in February 2020 found the treatment plant to be in satisfactory condition. Comments on Draft Permit Fact Sheet for Permit Renewal July 2023 - NPDES Permit NCO075515 - Page 2 IWC Calculations Facility: Boomer Ferguson Elementary WWTP Permit No.: NC0075515 Prepared By: Catherine Shadwell Enter Design Flow (MGD): 0.003 0.2 <= Permitted Flow if Different from Design Enter s7Q10 (cfs): 0.07 Enter w7Q10 (cfs): 0.1 Total Residual Chlorine (TRC) Ammonia (Summer) Daily Maximum Limit (ug/1) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted s7Q10 (CFS) 0.07 0.07 s7Q10 (CFS) 0.07 0.07 DESIGN FLOW (MGD) 0.003 € 0.2 DESIGN FLOW (MGD) 0.003 € 0.2 DESIGN FLOW (CFS) 0.00465 0.31 DESIGN FLOW (CFS) 0.00465 0.31 STREAM STD (UG/L) 17.0 17 STREAM STD (MG/L) 1.0 1 Upstream Bkgd (ug/1) 0 0 Upstream Bkgd (mg/1) 0.22 0.22 IWC (%) 6.23 81.58 IWC (%) 6.23 81.578947 Allowable Conc. (ug/1) 273 21 Allowable Conc. (mg/1) 12.7 1.2 Ammonia (Winter) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted Fecal Coliform w7Q10 (CFS) 0.1 0.1 Monthly Average Limit: 200/100m1 € 200/100m1 DESIGN FLOW (MGD) 0.003 0.2 (If DF >331; Monitor) DESIGN FLOW (CFS) 0.00465 0.31 (If DF<331; Limit) STREAM STD (MG/L) 1.8 1.8 Dilution Factor (DF) 16.05 1.23 Upstream Bkgd (mg/1) 0.22 0.22 IWC (%) 4.44 75.61 Allowable Conc. (mg/1) 35.8 2.3 *2B .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)