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Home My WebLink About2021-Appendix-V-I--IR-and-Permit-TablesChowan – Appendix V-I 1 2/18/2021 Appendix V-I Table V-I.1. Ambient Monitoring Data Years Used for Chowan River Basin Plans and Integrated Reporting Periods. Basin Plan Year AMS Data Window Notes 1997 1991-1995 2002 9/1/1995-8/31/2000 Chlorophyll a data for September 1996 – March 2001 removed from use. There was a statewide Chl a data issue. 2007 9/1/2000-8/31/2005 Nutrient reporting limits modified several times in 2001. See reporting limits table below. 2020 All data (1981-2018) Focus 2010-2018 There are a few stations with data back to the 1970’s. IR Year AMS Data Window Notes 1998 1991-1995 2000 1991-1995 2002 1991-1995 2004 9/1/95-8/31/00 2002 basin plan; except for Chl a (used historic listing) 2006 9/1/95-8/31/00 2002 basin plan; except for Chl a (used historic listing) 2008 2002-2006 Statewide Assessment 2010 2004-2008 Statewide Assessment 2012 2006-2010 Statewide Assessment 2014 2008-2012 Statewide Assessment 2016 2010-2014 Statewide Assessment 2018 2012-2016 Statewide Assessment 2020 2014-2018 Statewide Assessment 2022 2016-2020 Statewide Assessment 2024 2018-2022 Statewide Assessment Chowan – Appendix V-I 2 2/18/2021 Table V-I.2. DWR Nutrient Reporting Limits. (DWR laboratory confirmed these limits have not changed since 3/1/2009; April Williams, personal communication, 6/15/2020). Table V-I.3. Chowan River Nutrient/Chlorophyll a 303(d) Impairment History 1998-2020 (Table 5-4). 303(d) Listing Year Chowan River AU AU Segment Description Stream Length (Miles) Integrated Report Category Cause of Impairment/ Reason for Listing Potential Sources 1998 25e From Below Holiday Island near Harrellsville 5.5 5 Nutrients Industrial; Municipal 25f From Colerain to US Hwy 17 at Edenhouse 14.5 5 Nutrients NA 2000 25e * From Below Holiday Island near Harrellsville 5.5 5 Nutrients Industrial; Municipal 25f * From Colerain to US Hwy 17 at Edenhouse 14.5 5 Nutrients NA 2002 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 12.2 5 Nutrients Industrial; Municipal 25c + From subbasin 03-01-03/03/01/04 boundary to mouth defined by a line extending in a southerly direction from Reedy Point on the north shore of Albemarle Sound to a point of land on the south side of the mouth of Black Walnut Swamp 7.8 5 Nutrients NA 2004 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 12.2 5 Historical listing decision: Nutrients Industrial; Municipal 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 5 Historical listing decision: Nutrients NA 2006 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 5 Historical listing decision: Nutrients Industrial; Municipal 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 5 Historical listing NA Chowan – Appendix V-I 3 2/18/2021 decision: Nutrients 2008 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 1^ Delisted 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 1^ Delisted 2010 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 1 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 1 2012 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 1 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 1 2014 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 1 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 1 2016 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 1 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 1 2018 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 1 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 3a (Inconclusive) Chlorophyll a 2020 25b From Below Holiday Island near Harrellsville to subbasin 03-01- 03/03/01/04 boundary 14.1 TBD 25c + From subbasin 03-01-03/03/01/04 boundary to …. mouth of Black Walnut Swamp 7.8 TBD *2002 note: As a result of implementation of the nutrient sensitive waters (NSW) management strategy, substantial reductions in total phosphorus and total nitrogen loads are reported. DWQ will assess the continued implementation of the NSW strategy prior to TMDL development. + AU Segment Description - From subbasin 03-01-03/03/01/04 boundary to mouth defined by a line extending in a southerly direction from Reedy Point on the north shore of Albemarle Sound to a point of land on the south side of the mouth of Black Walnut Swamp ^ Category 1 in 2008 – Segment of Chowan River removed from the impaired 303 (d) list/category 5. Reason for delisting was “the assessment and interpretation of more recent or more accurate data in the record demonstrate that the applicable water quality standard is being met”. TBD – To be determined as part of the 2020 water quality assessment process which is underway. Link to 303(d)/305(b) Integrated Report lists - https://deq.nc.gov/about/divisions/water-resources/planning/modeling- assessment/water-quality-data-assessment/integrated-report-files Chowan – Appendix V-I 4 2/18/2021 Table V-I.4. Chowan River Basin NPDES Point Source Discharge Total Nitrogen and Total Phosphorus Loading (Table 5-3). Year Nitrogen Phosphorus Notes Load (lb/yr) % reduction from 1982 Load (lb/yr) % reduction from 1982 1982 612,880 55,556 1989 39,680 93.53 1,323 97.62 1996 40,065 93.46 2,926 94.73 1 Major Discharger – Union Piece Dye Works (1.5 MGD) 2019 6,216 98.99 2,321 95.82 1 Major Discharger - Ahoskie WWTP (1.3 MGD with NSW Limits of 3 mg/L-N & 1 mg/L-P) 1982, 1989 and 1996 loading from 1997 Chowan River Basinwide Water Quality Management Plan page 3-6 (https://deq.nc.gov/about/divisions/water-resources/planning/basin-planning/water- resource-plans/chowan-1997). -2019 load, See Appendix V-I.5 table for specific permit loading details. Chowan – Appendix V-I 5 2/18/2021 Table V-I.5. Chowan River Basin NPDES Point Source Permits with 2019 estimated Total Nitrogen and Total Phosphorus Load (Mike Templeton, July 2020). Permit Number Facility Name Owner Type County Permit Type Class Permit Flow GPD Receiving Stream TN Load (lb/yr) TP Load (lb/yr) HUC-12 Old DWR Subbasin # NC0033782 Gatesville Elementary School Government - County Gates Discharging 100% Domestic < 1MGD Minor 5,000 Bennetts Creek (Merchants Millpond) 27.2 6.9 030102030504 03-01-01 NC0033804 T.S. Cooper Elementary School Government - County Gates Discharging 100% Domestic < 1MGD Minor 4,000 Raynor Swamp (Hunters Millpond) 20.0 2.7 030102030502 03-01-01 NC0043974 Buckland Elementary School Government - County Gates Discharging 100% Domestic < 1MGD Minor 6,000 Cole Creek (Lilleys Millpond) 12.4 2.2 030102030204 03-01-01 NC0088561 Ahoskie WWTP Government - Municipal Hertford Municipal Wastewater Discharge, Large Major 1,300,000 Ahoskie Creek 3,235 847 030102030304 03-01-01 2015-2019: Average Load Min-Max 3,829 3,235-4,567 906 689-1,163 NC0089541 Ashton Lewis Lumber Co. Non - Government Gates Industrial Process & Commercial WW Discharge Minor Null Bennetts Creek (Merchants Millpond) --- --- 030102030504 03-01-01 NC0032719* Valhalla WTP Non - Government Chowan Water Plant and Water Conditioning Discharge Minor Not limited Rockyhock Creek (Bennett Millpond)* --- --- 030102030702* 03-04-04* NC0089516 Perdue Agribusiness LLC (Cofield) Industrial Process & Commercial Wastewater Discharge Hertford NCCW, BB, RO reject Minor Not limited Unnamed Tribut ary Deep Creek 1,922 1,146 030102030206 03-01-01 *New outfall under construction (as of January 2020 permit renewal) – discharge location will be in the Chowan River [AU# 25b], HUC-030102030701, and old DWR subbasin number 03-01-03. NCCW – Non-Contact Cooling Water; BB – Boiler Blowdown; RO – Reverse Osmosis;