Lake Pepin. TMDL Basics

Transcription

1 NORTH DAKOTA SOUTH DAKOTA Lake Pepin Basins BASIN Cannon River Basin Minnesota River Basin Minnesota River Basin St. Croix River Basin Upper Mississippi River Basin HUC Major Rivers Metro Area Lake Pepin Watershed MINNESOTA Upper Mississippi River Basin St. Croix River Basin Cannon River Basin IOWA WISCONSIN Lake Pepin Feature Area ( Kilometers ) Lake Pepin Watershed 122,575 Minnesota 218,480 Lake Pepin Watershed 105,368 with in Minnesota 2 Minnesota Pollution Controal Agency Lake Pepin TMDL Basics Largest TMDL to Date half of MN, part of WI Two States Border Water Impairment Two types of water bodies Lake River Two types of impairments Eutrophication Turbidity Sedimentation Lake Pepin filling in

2 TMDL Chronology (est.) 2002 Impaired Waters List 2004 Lake Pepin TMDL begins WQ Model TMDL Components Draft TMDL Public Review Final TMDL to EPA 4.09

3 Lake Pepin Watershed TMDL: MPCA Steering Support Leadership Education Draft TMDL Report Stakeholder Involvement Stakeholder Advisory Committee Help design TMDL work plan Provide advice on solutions and mouth of watershed goals Coordinate communications River Basin Teams Minnesota River Upper Mississippi River St. Croix River Lower Mississippi Metro Region Public Review EPA Approval Science Advisory Panel Review TMDL Documents Help to resolve technical issues Provide expert opinion on scientific questions Social/economic issues Sediment Reduction Advisory Panel (shared) Provide sediment reduction options Science Advisory panel for Minnesota and Crow River Watersheds

4 Spring Lake Turbidity Impairment Nutrient Impairment Lake Pepin

5 TMDL Goals Mississippi River : Aquatic Life 25 NTU (turbidity) Restore aquatic vegetation Medium-High Flow Critical Condition Lake Pepin: Recreation 100 ppb Total Phosphorus 32 ppb chlorophyll a 0.8 m Secchi transparency Low Flow Critical Condition

6 Turbidity Impairment: Why Worry? Tundra Swan Food Source Wild Celery - Vallisneria Sufficient underwater light energy is necessary for the growth of submersed aquatic vegetation

7 Beneficiaries of vegetation pg

8 Pool 2 Potential Aquatic Vegetation Beds 2 feet or less = Potential Emergent and Submersed Aquatic Vegetation 5 feet or less = Potential Submersed Aquatic Vegetation Greater than 5 feet or flowing channel

9 Geological (Historical) Definition of Background Sediment Flux (1000 T/yr) Cultural Natural Background

10 TSS Load (Metric tons/day) Scenario 17 Reductions on an Annual Basis, 2002 Conditions St. Croix Bar chart, TSS load, Baseline vs River 17 Baseline Scenario 17 Upper Mississippi River Minnesota River Cannon & Vermillion Rivers Other Direct WWTPs Scenario 17 reductions: 20% in Upper Miss. River 50% in Minnesota River 20% in St. Croix River 50% in Cannon River 20% in other tributaries Direct WWTPs at permitted flows and TSS Reduced resuspension in Pool 2

11 LTRMP Turbidity (NTRU) Effect of Scenario 17 Reductions over 22-Year Period, LD Avgerage Turbidity (May 15-Sept 15) at LD2 Baseline Scenario 17 Reductions Bar chart, 22-years, Baseline side-by-side with 17, highlighted

12 TP Load (Metric tons/yr) Scenario 17 Reductions on an Annual Basis, 2006 Conditions St. Croix Bar chart, TSS load, Baseline vs River 17 0 Baseline Scenario 17 Upper Mississippi River Minnesota River Cannon & Vermillion Rivers Other Direct WWTPs Scenario 17 reductions: 20% in Upper Miss. River 50% in Minnesota River 20% in St. Croix River 50% in Cannon River 20% in other tributaries Direct WWTPs at permitted flows and 0.3 mg/l TP Reduced resuspension in Pool 2

13 Chlorophyll (ug/l) Effect of TP Reductions on Chl-a, Lake Pepin Average, Low-Flow Conditions, June - Sept. Lake Pepin - All Scenarios Total Phosphorus (mg/l)

14 Critical Distinction: TMDL vs. Implementation Plan TMDL Report to EPA Must Meet Water Quality Standards Implications for Sectors Regulated under NPDES WLA reflected in enforceable permits Implications for nonpoint sources LA reflected in programs such as CWLA Reasonable assurance of meeting load allocation Use existing authorities CWLA Largely voluntary, incentivebased programs TMDL Implementation Plan Not required by EPA Required by state for access to certain funds Implementation can be phased in stages 20% - 40%- 60% - 80% Harmonize scales Pepin Watershed Drainage Basin Major watershed Adaptive Management Plan Do Check -- Revise as needed

15 Implementation Planning Components Gross Allocations of TP and TSS by basin Basin Plans with individual allocations & permits, nonpoint source targets & strategies Major watershed chapters River Management Methods Water level drawdowns, island building, to reduce sediment resuspension Monitoring Plan/Adaptive Management

16 Adaptive Approach for Meeting Turbidity Standard and Vegetation Objectives Achieve 20 NTRU Standard Existing conditions Implement 20% reduction & ecosystem restoration (ER) Monitor turbidity and aquatic vegetation Implement 80% reduction & ER Vegetation objectives are met success?? Monitor turbidity and aquatic vegetation Achieve 40 NTRU Achieve 30 NTRU Monitor turbidity and aquatic vegetation Implement 50% reduction & ER

17 T ogether M innesotans D eveloping L egacies Rep. Dennis Ozment, 2004