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Home My WebLink AboutNC0070459_Draft_FactSheet_20231010 Fact Sheet for Permit Renewal Sept 2023 - NPDES Permit NC0070459 - Page 1 NCDEQ / DWR / NPDES EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL NPDES Permit NC0070459 Caroline Robinson / Compliance & Expedited Permitting Unit / caroline.robinson@deq.nc.gov / Sept 2023 FACILITY INFORMATION Applicant/Facility Name The Yadkin County Board of Education (Mitchell T Long, ORC) Starmount High School WWTP Applicant Address 121 Washington Street, Yadkinville, NC 27055 Facility Physical Address/Mailing Address 2516 Longtown Road, Boonville, NC 27011 Permitted Flow (MGD) 0.026 MGD Type of Waste 100% Domestic, < 1 MGD Facility Class WW-2 County Yadkin Permit Status Renewal Regional Office WSRO STREAM CHARACTERISTICS Receiving Stream unnamed tributary to South Deep Creek Stream Classification WS-III Stream Segment 12-84-2-(1) Outfall Lat. 36° 10' 49" N 7Q10 - Summer (cfs) 0.06 Outfall Long. 80° 46' 21" W 7Q10 - Winter (cfs) 0.15 Drainage basin Yadkin-Pee Dee River Basin 30Q2 (cfs) 0.2 Subbasin 03-07-02 Average Flow (cfs) 0.7 HUC 030401011101 IWC (%) 40.18% (summer) / 21.18% (winter) 303(d) List No BASIC INFO FOR EXPEDITED PERMIT RENEWAL Does permit need Daily Max NH3 limits? The daily maximum effluent limit for Ammonia Nitrogen in the summer months (April 1-October 31) was changed from 11 mg/L to 10.5 mg/L based on the IWC calculations and 2016 NH3 guidance document. The change can be found in Part I. 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: Nov 30, 2028 FACILITY SUMMARY The Yadkin County Board of Education operates a 100% domestic wastewater treatment plant for an estimated 1,168 residents. The Starmount High School WWTP is a minor facility (flow < 1 MGD) with a design capacity and permitted wastewater discharge of 0.026 MGD. The original NPDES permit for this facility was issued in December 1987. This facility utilizes the following treatment components: • Bar screen • 8,000-gallon equalization basin • Two 13,000-gallon aeration basins with submerged diffusers • Two 64-ft2 clarifiers with air lift sludge pumps • UV disinfection system • 1,800-gallon backup tablet chlorination/dechlorination unit Fact Sheet for Permit Renewal Sept 2023 - NPDES Permit NC0070459 - Page 2 • Dual aerobic sludge storage tanks • Flow meter RENEWAL SUMMARY This renewal contains the following changes: • Updated eDMR language for electronic data submission in Part I. A. (3). • Updated the daily maximum effluent limit for Ammonia Nitrogen for the summer months (April 1 – October 31) based on the IWC calculations and 2016 NH3 guidance document. The daily maximum summer limit for Ammonia Nitrogen will be 10.5 mg/L. The changes can be found in Part I. A. (1.). COMPLIANCE HISTORY Starmount High School WWTP has had no reported enforcements since 2015. The facility has been issued one NOD for an Ammonia Nitrogen limit violation in 2019 and two NOVs for fecal coliform limit violations in 2021, since the permit went into effect in January 2019. Most recent inspection (May 2023) showed the facility to be in compliance. The inspector noted that the WWTP appeared to be well operated and maintained.