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20130927Nutrients_Modeling_Update_-_Wade_Cantrell,_SCDHECLower Catawba Basin Nutrient TMDL Update Lower Catawba Basin Background • History of nutrient overload • Effects expressed in SC lakes – Impaired water quality: Phosphorus, Nitrogen, Chlorophyll, pH, Dissolved Oxygen – Increased DO depletion in bottom waters • Water quality management concern since at least 1990s – Modeling studies (Duke, USC, SCDHEC, NCDWQ, et al.) – SC numeric nutrient criteria (2001) – NPDES permitting • SCDHEC begins limiting Phosphorus in permits (2001) • Settlement agreement SCDHEC, NCDWQ, Charlotte (2002) • NC NPDES Phosphorus load reductions (2006) Background (cont.) • SCDHEC TMDL effort – Additional modeling, stakeholder meetings, model review, technical comments (2005-2008) – TMDL development paused • Other projects • System changing/model updates needed • Declining resources Total Phosphorus Loads Discharged into Lower Catawba Basin - Fishing Creek Reservoir from Major NC & SC Dischargers 0 200 400 600 800 1000 1200 1/1/1998 1/1/2000 1/1/2002 1/1/2004 1/1/2006 1/1/2008 1/1/2010 1/1/2012 1/1/2014 Date TP ( k g / d a y ) NC Total SC Total Total Phosphorus Concentrations in Fishing Creek Reservoir at SC-9 and at Dam 0.00 0.10 0.20 0.30 0.40 0.50 0.60 1/1/1998 1/1/2000 1/1/2002 1/1/2004 1/1/2006 1/1/2008 1/1/2010 1/1/2012 1/1/2014 Date TP ( m g / L ) SC-9 Dam Lake Standard TP Standard 0.84 Total Phosphorus Concentrations in Lake Wateree at Headwater (Cedar Creek Reservoir TR) and at Dam 0.00 0.05 0.10 0.15 0.20 0.25 0.30 1/1/2002 1/1/2004 1/1/2006 1/1/2008 1/1/2010 1/1/2012 1/1/2014 Date TP ( m g / L ) Dam Headwater Lake Standard TP Standard 303(d) List of Impaired Waters • 2012 List – Data 2006-2010 plus legacy sites • Lake Wylie, SC not impaired • Fishing Creek Reservoir: P, N, pH, chl-a • Great Falls Reservoir: P, N, chl-a • Cedar Creek Reservoir: P, N, DO • Lake Wateree: P, pH, DO • 2014 List – Data 2008-2012 plus legacy sites – Draft for public comment February 2014 TMDL Development Resumed • Model updates – EPA 319 NPS Grant funds used to contract Systech Water Resources, Inc. – Extend WARMF model to 2012 (completed June 2013) • Good response to our data requests – Model calibration (scheduled completion April 2014) Looking Ahead • Web page – coming soon • Information, reports, model files • Stakeholder information meeting – Nov 19th • Rock Hill Operations Center • Email announcement soon • Model calibration review – Jan-Feb 2014 • Draft calibration report and model files available • Comments requested • Final calibration report – Apr 2014 • Stakeholder review and coordination – 2014-2015 • Load Scenarios Allocations TMDL Summing Up • Significant Phosphorus reductions have been implemented by NC and SC facilities • WQ improvements in SC lakes have occurred • Goal of the current modeling effort is to determine what more is needed, considering all sources, to achieve WQ standards • Coordination with NCDWQ and EPA Region 4 has begun and will expand to include stakeholders prior to drafting the TMDL • Questions? •For more information Wade Cantrell, Manager 303(d), TMDL, and NPS Section SCDHEC Bureau of Water (803) 898-3548 cantrewm@dhec.sc.gov