Loading...
HomeMy WebLinkAboutNC0021890_Fact Sheet_20240123NCDEQ / DWR / NPDES EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL NPDES Permit NCO021890 Catherine Shadwell, Compliance & Expedited Permitting Unit / 919-707-3613 Jan 2024 FACILITY INFORMATION Applicant/Facility Name Town of Granite Falls (Randy Smith, Water Resources Director) Town of Granite Falls Wastewater Treatment Plant Facility Physical Address 60 Meandering Way Granite Falls, NC 28630 Mailing Address P.O. Drawer 10 Granite Falls NC 28630 Permitted Flow (MGD) 0.900 MGD Type of Waste Municipal Wastewater Discharge, < 1 MGD Facility Class WW-3 County Caldwell Permit Status Renewal Regional Office ARO STREAM CHARACTERISTICS Receiving Stream Gunpowder Creek Stream Classification WS-IV;CA Stream Segment 11-55-(4) Outfall Lat. 350 47' 49.9" N 7Q10 - Summer (cfs) 9.3 Outfall Long. 810 24' 38.2" W 7Q10 - Winter (cfs) 12 Drainage basin Catawba 30Q2 (cfs) — Subbasin 03-08-32 Average Flow (cfs) 44 HUC 030501010803 IWC (%) 13.04% (summer) / 10.41 % (winter) 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? Yes, quarterly chronic toxicity testing (see notes under comments on draftpermit) Does permit have any Special Conditions? No Does permit have instream monitoring? Yes, U&D for Dissolved Oxygen and Temp New expiration date: January 31, 2029 Facility Summary Town of Granite Falls operates a Municipal Wastewater Discharge facility for the municipality which serves about 5,000 residents. The Granite Falls Wastewater Treatment Plant is a minor facility (flow < 1 MGD) with a design capacity and permitted wastewater discharge of 0.900 MGD. The WWTP was originally permitted in 1981. This facility utilizes the following treatment components: • Aerated grit chamber with self cleaning bar screen • Influent Parshall Flume with Ultrasonic flow meter • Two (2) each oxidation ditches in parallel • Two (2) each clarifiers, peripheral in parallel • Gas chlorination • Chlorine contact basin • Dechlorination • Cascade aeration • Aerobic sludge digester, and • Sludge drying beds with polymer feed system Fact Sheet for Permit Renewal Jan 2024 - NPDES Permit NCO021890 - Page 1 Renewal Summary This renewal contains the following changes: • Added the facility grade to Section A. (1.). • Updated the effluent table in Section A. (1.) with updated eDMR parameter codes. • Updated Section A. (3.) to reflect current federal requirements for Electronic Reporting of Discharge Monitoring Reports. • Updated outfall map • Added winter NH3 limits to be within 2x of summer limits per 02B.0504 • Toxicity testing removed per guidance of the Aquatic Toxicity Branch (See comments below) Compliance History Looking back through 2019, Granite Falls Wastewater Treatment Plant has not received any enforcements, or NOVs in the last 5 years. The most recent inspection (09/02/2020) found the facility to be well maintained and operated, with no violations of the permit conditions. Whole Effluent Toxicity (WET) Testing — IF PERMIT HAS TOXICITY TESTING WET testing is required in this permit as freshwater Chronic [TGP3B] Pass/Fail Quarterly monitoring with Ceriodaphnia dubia at an effluent concentration of 13%. This facility has passed 12 out of the past 12 toxicity tests. Testing has been removed from this permit since the facility discharges 100% domestic discharge. Comments on Draft Permit - Winter NH3 limits should not exceed 2x summer limits per 02B.0504, recommended to update winter limits to 12.4. - Toxicity testing is not required since facility is 100% domestic — per Cindy Moore of the Aquatic Toxicology Branch Fact Sheet for Permit Renewal Jan 2024 - NPDES Permit NCO021890 - Page 2 IWC Calculations Facility:Town of Granite Falls Wastewater Treatment Plant Permit No.: NC0021890 Prepared By: Catherine Shadwell Enter Design Flow (MGD): 0.9 0.2 <= Permitted Flow if Different from Design Enter s7Q10 (cfs): 9.3 Enter w7Q10 (cfs): 12 Total Residual Chlorine (TRC) Ammonia (Summer) Daily Maximum Limit (ug/1) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted s7Q10 (CFS) 9.3 9.3 s7Q10 (CFS) 9.3 9.3 DESIGN FLOW (MGD) 0.9 0.2 DESIGN FLOW (MGD) 0.9 0.2 DESIGN FLOW (CFS) 1.395 0.31 DESIGN FLOW (CFS) 1.395 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 (%) 13.04 3.23 IWC (%) 13.04 3.2258065 Allowable Conc. (ug/1) 130 527 Allowable Conc. (mg/1) 6.2 24.4 Ammonia (Winter) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted Fecal Coliform w7Q10 (CFS) 12 12 Monthly Average Limit: 200/100ml 200/100ml DESIGN FLOW (MGD) 0.9 0.2 (If DF >331; Monitor) DESIGN FLOW (CFS) 1.395 0.31 (If DF<331; Limit) STREAM STD (MG/L) 1.8 1.8 Dilution Factor (DF) 7.67 31.00 Upstream Bkgd (mg/1) 0.22 0.22 IWC (%) 10.41 2.52 Allowable Conc. (mg/1) 15.4 63.0 *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) Permit Facility County Region Outf, Date Parameter NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/5/2019 TGP313 - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/7/2019 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/4/2019 TGP313 - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/6/2019 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/10/2019 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/12/2019 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/9/2019 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/12/2019 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/3/2020 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/5/2020 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/2/2020 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/4/2020 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/1/2020 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/3/2020 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/15/2020 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/17/2020 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/9/2021 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/11/2021 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/8/2021 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/10/2021 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/14/2021 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/16/2021 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/7/2021 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/9/2021 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/8/2022 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/10/2022 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/7/2022 TGP31B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/9/2022 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/13/2022 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/15/2022 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/6/2022 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 12/8/2022 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/7/2023 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 3/9/2023 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/6/2023 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 6/8/2023 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/12/2023 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia NC0021890 Town of Granite Falls - Granite Falls WWTP Caldwell Asheville 001 9/14/2023 TGP3B - Pass/Fail Static Renewal May Chronic Ceriodaphnia Param Class Sample UoM Value Location Subbasin Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32 Biological Composite pass/fail 1 Effluent 03-08-32