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Implementation of Florida's Numeric Nutrient Standards

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Implementation of Florida's Numeric Nutrient Standards Implementation of Florida’s Numeric Nutrient Standards Document Submitted to EPA in Support of the Department of Environmental Protection’s Adopted Nutrient Standards for Streams, Spring Vents, Lakes, and Selected Estuaries March 2013 6BTABLE OF CONTENTS Purpose of Document ............................................................................................................ 1 Background ........................................................................................................................... 1 The Hierarchical Approach ..................................................................................................... 1 Nutrient Criteria for Lakes ..............................................................................................................2 Nitrate-Nitrite Criterion for Spring Vents .........................................................................................4 Using Measures of Flora and Fauna and Regional Nutrient Thresholds in Streams ............................5 Stream Definition ...................................................................................................................5 Implementation of NNC in Streams ........................................................................................6 Floral Evaluation for Determining Achievement of NNC ..........................................................8 Evaluating Algal Mats ........................................................................................................... 10 RPS Decision Key................................................................................................................... 10 Evaluating Changes in Species Composition .......................................................................... 11 Algal Species Composition Decision Key ............................................................................... 12 Evaluating the Presence or Absence of Nuisance Macrophyte Growth ................................... 12 LVS Decision Key ................................................................................................................... 13 Evaluating Algal Blooms, Chlorophyll a, and Phytoplankton Taxonomic Data ......................... 14 Chlorophyll/Algal Bloom Decision Key ................................................................................. 15 Floral Measures Summary .................................................................................................... 16 Faunal Evaluation for Determining Achievement of NNC ....................................................... 16 Examples of a Weight-of-Evidence Approach for Determining Achievement of Nutrient Criteria............................................................................................................... 17 Stream Sampling Locations and Other Environmental Considerations ................................... 20 Nutrient Criteria in Estuaries ......................................................................................................... 21 Decision Matrix and Examples for Implementing the Hierarchical Process ............................ 21 Hierarchies 1 and 2 ....................................................................................................................... 24 Examples of Hierarchy 1 ....................................................................................................... 24 Examples of Hierarchy 2 ....................................................................................................... 24 Hierarchy 3...................................................................................................................................25 Examples of Hierarchy 3 ....................................................................................................... 26 ii Waterbody Types and Cases with Insufficient Information ............................................................. 28 Other Components of NNC ............................................................................................................ 28 NNC and Protection of Downstream Waters .................................................................................. 29 Water Quality Modeling ....................................................................................................... 29 Issuance of NPDES Permits ................................................................................................... 29 Evaluation of Trends ............................................................................................................ 30 Trend Test Summary ............................................................................................................ 32 Discussion of TMDLs as NNC ......................................................................................................... 33 Discussion of Site Specific Alternative Criteria as NNC .................................................................... 34 Implementing the NNC Revisions to the Impaired Waters Rule (Chapter 62-303, F.A.C.) ....... 35 Assessment of Estuaries ................................................................................................................ 40 Assessment of Waterbodies with Interpretations of the NNC Expressed as Loads or Delivery Ratios .............................................................................................................................. 41 Impaired Waters Rule Assessment Summary ........................................................................ 41 Surface Water Discharge Wastewater Permits ..................................................................... 42 WQBEL Procedures for Each Tier of the Hierarchy ................................................................. 43 Basic Information Needs for Distinguishing Flowing Waters Under 62-302.200(36), F.A.C. .... 49 General Information ..................................................................................................................... 50 Non-Perennial Water Segments .................................................................................................... 50 Vascular Plants as Indicators ................................................................................................ 50 Macroinvertebrates as Indicators ......................................................................................... 51 Tidally Influenced Segments ......................................................................................................... 54 Water Management Conveyances ................................................................................................ 55 Delineation .......................................................................................................................... 56 Primary Water Management Purpose ................................................................................... 56 Physical Alteration that Limits Habitat .................................................................................. 56 Appendix A. Minimally Disturbed and Healthy Streams ................................................................ 58 Table A-1. List of healthy streams (passing SCI) used to inform RPS expectations. ............ 58 Table A-2. List of benchmark streams used to establish RPS and LVS expectations. ................................................................................................................ 64 Table A-3. List of healthy streams (passing SCI) used to inform stream chlorophyll a expectations. .......................................................................................... 65 iii Table A-4. List of benchmark streams used to establish stream chlorophyll a expectations. ................................................................................................................ 73 iv 0BPURPOSE OF DOCUMENT This document describes how numeric nutrient standards in Chapters 62-302 (Water Quality Standards) and 62-303 (Identification of Impaired Surface Waters), Florida Administrative Code (F.A.C.), are implemented by the Department of Environmental Protection (Department). The major topics include the hierarchical approach used to interpret the narrative nutrient criterion (NNC) on a site-specific basis; a summary of the criteria for lakes, spring vents, streams and estuaries; floral measures and the weight of evidence approach in streams; example scenarios for how the criteria will be implemented in the 303(d) assessment process; and a description of how the Water Quality Based Effluent Limitation (WQBEL) process is used to implement the nutrient standards in wastewater permitting. Finally, because of the complexity associated with assessing nutrient enrichment effects in streams, a summary of the weight-of-evidence evaluation involving flora, fauna, and Nutrient Thresholds is provided. 1BBACKGROUND Nutrients are naturally present in aquatic systems and are necessary for the proper functioning of biological communities. Nutrient effects on aquatic ecosystems are moderated in how they are expressed by many natural factors (e.g., light penetration, hydraulic residence time, presence of herbivore grazers and other food web interactions, and habitat considerations). As a result, determining the appropriate protective nutrient regime is largely a site-specific undertaking, requiring information about ecologically relevant responses. 2BTHE HIERARCHICAL APPROACH The NNC in paragraph 62-302.530(47)(b), F.A.C., states that “in no
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