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NC0033448_Draft Factsheet_20230530NCDEQ / DWR / NPDES EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL NPDES Permit NCO033448 Catherine Shadwell Compliance & Expedited Permitting Unit / 919-707-3613 May 2023 FACILITY INFORMATION Owner/Facility Name MS & SR Enterprises LLC Valley Creek Apartments WWTP Applicant Name Water Quality and Operations, Inc (Paul Isenhour) Applicant Address P.O Box 1167, Banner Elk, NC 28604 Facility Physical Address/Mailing Address Mailing — 104 Helen Court, Boone, NC 28607 Physical — 10894 NC Highway 105 S, Boone, NC 28607 Permitted Flow (MGD) 0.005 MGD Type of Waste 100% Domestic, < 1 MGD Facility Class WW-2 County Watauga Permit Status Renewal Regional Office WSRO STREAM CHARACTERISTICS Receiving Stream Valley Creek Stream Classification C; Tr Stream Index 8-4 Outfall Lat. 360 08' 40" N 7Q 10 - Summer (cfs) 0.3 Outfall Long. 810 48' 02" W 7Q10 - Winter (cfs) 0.36 Drainage basin Watauga 30Q2 (cfs) 0.73 Subbasin 04-02-01 Average Flow (cfs) 2.9 HUC 060101030301 IWC (%) Summer — 2.52% Winter — 2.11% 303(d) List Not listed. Facility Summary Valley Creek Apartments are a small residential apartment housing about 20 residents. It has a private closed system that feeds into the onsite Valley Creek WWTP. This is a minor facility (flow < 1 MGD) with a permitted wastewater discharge of 0.005 MGD. The permit for this facility was originally issued in March of 1982. • aeration basin • clarifier • sludge -holding basin • chlorination / chlorine -contact chamber • dechlorination Renewal Summary This renewal contains the following changes: • Updated A (2) Electronic Reporting to reflect most updated language and added facility grade. • Updated Map HUC code to 12 code in order to be the most accurate. • Facility grade updated to WW2 in 2018, monitoring frequencies have been updated to reflect change. • Added effluent monitoring for turbidity to determine compliance with 15A NCAC 02B.0211 (21). • Added effluent monitoring for dissolved oxygen to determine compliance with 15A NCAC 02B.0211 (6). • Added instream monitoring for temperature to determine compliance with 15A NCAC 02B.0211 (18). Fact Sheet for Permit Renewal May 2023 - NPDES Permit NCO033448 - Page 1 Compliance History Notes from WSRO — There were a couple of issues here. The drive unit is OOS with no back up. The ORC is hand cranking the unit. Additionally, there was exposed PVC pipes. I check in frequently on this facility. If I get any more, I'll pass along to permit writer. Upgrades are being done, and I will keep reaching out for updates. No recorded enforcements in the last 5 years, and most recent NOV was in 2014 for Coliform. Comments on Draft Permit Minor grammar and format edits No significant comments on draft Fact Sheet for Permit Renewal May 2023 - NPDES Permit NCO033448 - Page 2 IWC Calculations Facility: Valley Creek Apartments WWTP Permit No.: NC0033448 Prepared By: Catherine Shadwell Enter Design Flow (MGD): 0.005 0.2 <= Permitted Flow if Different from Design Enter s7Q10 (cfs): 0.3 Enter w7Q10 (cfs): 0.36 Total Residual Chlorine (TRC) Ammonia (Summer) Daily Maximum Limit (ug/1) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted s7Q10 (CFS) 0.3 0.3 s7Q10 (CFS) 0.3 € 0.3 DESIGN FLOW (MGD) 0.005 € 0.2 DESIGN FLOW (MGD) 0.005 € 0.2 DESIGN FLOW (CFS) 0.00775 0.31 DESIGN FLOW (CFS) 0.00775 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 (%) 2.52 € 50.82 IWC (%) 2.52 € 50.819672 Allowable Conc. (ug/1) 675 33 Allowable Conc. (mg/1) 31.2 1.8 Ammonia (Winter) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted Fecal Coliform w7Q10 (CFS) 0.36 € 0.36 Monthly Average Limit: 200/100m1 200/100ml DESIGN FLOW (MGD) 0.005 0.2 (If DF >331; Monitor) DESIGN FLOW (CFS) 0.00775 0.31 (If DF<331; Limit) STREAM STD (MG/L) 1.8 E 1.8 Dilution Factor (DF) 39.71 1.97 Upstream Bkgd (mg/1) 0.22 0.22 IWC (%) 2.11 46.27 Allowable Conc. (mg/1) 75.2 3.6 '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)