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Home My WebLink About00 - Table of ContentsARCADIS City of Sebastian Stormwater Master Plan Update City of Sebastian Stormwater Master Plan Update Stormwater Master Plan Update City of Sebastian Prepared By: Arcadis U.S., Inc. 1800 Pembrook Drive, Suite 300 Orlando Florida 33324 Phone: 407.660.1133 Our Ref: 30056499 Christopher C. Tilman, PE, BCEE Project Manager Mark Van Auken Stormwater Technical QA/QC Lead Prepared For: Mr. Brian Benton City Manager City of Sebastian 1225 Main St. Sebastian, FL 32958 This document is intended only for the use of the individual or entity for which it was prepared and may contain information that is privileged, confidential and exempt from disclosure under applicable law. Any dissemination, distribution or copying of this document is strictly prohibited. www.arcadis.com City of Sebastian Stormwater Master Plan Update Contents 1 Introduction...................................................................................................................................................... 1 1.1 Background..............................................................................................................................................1 1.2 Previous Studies...................................................................................................................................... 2 1.3 Extent -of -Service and Level-of-Service................................................................................................. 2 1.3.1 Flooding................................................................................................................................................3 1.3.2 Water Quality........................................................................................................................................ 5 1.3.3 LOS Summary...................................................................................................................................... 6 1.4 Regulatory and Intergovernmental Framework.................................................................................... 7 1.4.1 Agencies Having Jurisdiction............................................................................................................ 7 1.4.1.1 United States Environmental Protection Agency(USEPA)..................................................... 7 1.4.1.2 Federal Emergency Management Agency(FEMA)................................................................... 8 1.4.1.3 State of Florida Department of Environmental Protection(FDEP)......................................... 8 1.4.1.4 St. Johns River Water Management District (SJRWMD)......................................................... 8 1.4.1.5 Florida Department of Transportation(FDOT).......................................................................... 8 1.4.1.6 Local Government - Indian River County.................................................................................. 9 1.4.1.7 F.S. 298 Special Drainage Districts............................................................................................ 9 1.4.1.8 Incorporated Municipalities........................................................................................................ 9 1.4.1.9 Private Systems........................................................................................................................... 9 1.4.2 City of Sebastian Goals and Regulatory Requirements.................................................................. 9 1.4.2.1 City Goal....................................................................................................................................... 9 1.4.2.2 NPDES MS4 Permit Requirements............................................................................................. 9 1.4.2.2.1 Required Minimum Control Measures................................................................................ 11 1.4.2.3 Adopted Total Maximum Daily Load (TMDL) Requirements ................................................. 11 1.4.2.4 Central Indian River Lagoon Basin Management Action Plan for Adopted TMDLs ........... 11 1.4.2.5 Indian River Lagoon Comprehensive Conservation and Management Plan ....................... 14 1.4.2.6 Integrated Pest Management Plan........................................................................................... 15 1.4.2.7 City Ordinances Related to the NPDES MS4 Permit SWMP.................................................. 16 1.5 Project Goals.......................................................................................................................................... 17 2 Existing Conditions....................................................................................................................................... 18 2.1 Geology and Soils................................................................................................................................. 18 2.2 Environmental........................................................................................................................................20 2.3 Drainage System Characteristics........................................................................................................ 20 www.arcadis.com City of Sebastian Stormwater Master Plan Update 2.3.1 Previous Completed Improvements................................................................................................ 21 2.3.2 Previously Identified Drainage issues............................................................................................. 21 2.3.2.1 Topography................................................................................................................................21 2.3.2.2 Surface Water Elevations (Tailwater Controls)....................................................................... 22 2.3.2.3 Groundwater Elevations........................................................................................................... 22 2.3.2.4 Geology and Soils..................................................................................................................... 22 2.3.2.5 Inadequate Stormwater Infrastructure.................................................................................... 22 2.3.2.6 Operations and Maintenance Difficulties................................................................................ 22 2.3.2.7 Environmental Concerns.......................................................................................................... 23 3 Data and Methodology.................................................................................................................................. 24 3.1 Meetings with the City and Available Data.......................................................................................... 24 3.2 Stormwater System GIS Map Development........................................................................................ 24 3.3 Infrastructure Asset Survey and Assessment.................................................................................... 25 3.3.1 Asset Assessment Goals, Criteria and Methodology.................................................................... 25 3.3.2 Inspection Methodology................................................................................................................... 25 3.3.3 SWMS Components........................................................................................................................... 26 3.3.3.1 Canals......................................................................................................................................... 26 3.3.3.2 Green Infrastructure.................................................................................................................. 26 3.3.3.3 Conveyance Structures............................................................................................................. 28 3.4 Hydrologic and Hydraulic Modeling.................................................................................................... 28 3.4.1 H&H Model Goals and Limitations................................................................................................... 28 3.4.2 Software Selection............................................................................................................................. 28 3.4.3 Model Extents and Level of Detail................................................................................................... 29 3.4.4 Hydraulic Parameters........................................................................................................................ 32 3.4.4.1 Outfall Boundary Conditions.................................................................................................... 34 3.4.5 Hydrologic Parameters..................................................................................................................... 35 3.4.5.1 Subcatchment Delineation........................................................................................................ 35 3.4.5.2 Rainfall........................................................................................................................................38 3.4.6 H&H Model Validation....................................................................................................................... 40 3.4.7 H&H Model Limitations..................................................................................................................... 40 3.5 Existing Conditions Design Storm Analysis Results........................................................................ 41 4 Water Quality Assessment........................................................................................................................... 45 4.1 Effects of Urban Stormwater Runoff................................................................................................... 45 4.1.1 Water Quality Effects......................................................................................................................... 45 www.arcadis.com City of Sebastian Stormwater Master Plan Update 4.1.1.1 Short -Term Water Quality Effects............................................................................................ 47 4.1.1.2 Long -Term Water Quality Effects............................................................................................. 47 4.1.2 Physical Effects................................................................................................................................. 47 4.2 Best Management Practices................................................................................................................. 48 4.2.1 Best Management Practices (BMPs) Considerations.................................................................... 48 4.2.1.1 Non-structural Source Controls............................................................................................... 48 4.2.1.1.1 Land Use Planning................................................................................................................ 48 4.2.1.1.2 Public Information Program................................................................................................. 49 4.2.1.1.3 Fertilizer Application Control............................................................................................... 49 4.2.1.1.4 Pesticide Use Control........................................................................................................... 49 4.2.1.1.5 Solid Waste Management..................................................................................................... 50 4.2.1.1.6 DCIA Minimization................................................................................................................. 50 4.2.1.1.7 Erosion and Sediment Control on Construction Sites ...................................................... 50 4.2.1.2 Structural Stormwater Controls............................................................................................... 50 4.2.1.2.1 Retention Systems................................................................................................................ 50 4.2.1.2.2 Dry Detention Systems......................................................................................................... 52 4.2.1.2.3 Underdrain Systems............................................................................................................. 53 4.2.1.2.4 Wet Detention Systems........................................................................................................ 53 4.2.1.2.5 Wetland Systems.................................................................................................................. 55 4.2.1.2.6 Exfiltration Trenches............................................................................................................ 56 4.2.1.2.7 Grassed Swales and Channels............................................................................................ 57 4.2.1.2.8 Inlet Filters............................................................................................................................. 58 4.2.1.2.9 Baffle Boxes.......................................................................................................................... 59 4.2.1.2.10 Aeration Systems................................................................................................................ 59 4.3 State Water Quality Standards............................................................................................................. 59 4.3.1 Surface Water Quality Standards..................................................................................................... 60 4.3.2 Nutrient Loadings (Nitrogen and Phosphorus).............................................................................. 60 4.3.3 Dissolved Oxygen.............................................................................................................................. 61 4.4 Total Maximum Daily Load (TMDL) Requirements............................................................................. 62 4.5 Water Quality Model Evaluation........................................................................................................... 62 4.5.1 Water Quality Model — SWIL............................................................................................................. 62 4.5.2 Water Quality Conclusions/Recommendations............................................................................. 63 5 Sea Level Rise Assessment......................................................................................................................... 65 5.1 State Climate Change Efforts............................................................................................................... 65 www.arcadis.com iv City of Sebastian Stormwater Master Plan Update 5.2 Available Reports and SLR Projections.............................................................................................. 66 5.3 Expected Effects.................................................................................................................................... 68 6 Operations and Maintenance....................................................................................................................... 71 6.1 O&M Program Requirements............................................................................................................... 71 6.2 Relevant City Ordinances and Codes.................................................................................................. 72 6.3 Existing Operations and Maintenance Program................................................................................ 73 6.3.1 Stormwater Management Organization........................................................................................... 73 6.3.2 Current Resources............................................................................................................................ 73 6.3.3 Operational Responsibilities and Maintenance Activities............................................................. 75 6.3.4 Problem Areas................................................................................................................................... 79 6.3.5 O&M Plan Development.................................................................................................................... 80 6.4 Proposed Operation and Maintenance Plan....................................................................................... 81 6.4.1 Purpose and Goals............................................................................................................................ 81 6.4.2 Stormwater Management Organization........................................................................................... 82 6.4.2.1 Organizational Structure........................................................................................................... 82 6.4.2.2 Operational Responsibilities.................................................................................................... 83 6.4.3 Asset Management............................................................................................................................ 83 6.4.3.1 Scope of Maintenance Asset Management............................................................................. 83 6.4.3.2 Computerized Maintenance Management System (CMMS) Protocols ................................. 83 6.4.4 Standard Inspection and Maintenance Protocols.......................................................................... 84 6.4.4.1 Overview of Inspection and Maintenance Protocols............................................................. 84 6.4.4.2 List of BMP Asset Categories and Technologies................................................................... 84 6.4.4.3 Inspection Protocols for SWMS Assets.................................................................................. 85 6.4.4.4 Inspection Frequencies and Protocols................................................................................... 86 6.4.4.5 Non -Routine and Corrective Maintenance Protocols for SWMS Assets ............................. 95 6.4.4.5.1 Non -Routine Tasks............................................................................................................... 95 6.4.4.5.2 Corrective Maintenance Actions......................................................................................... 95 6.4.4.6 Recommended Maintenance Frequency Based on Service Level ....................................... 96 6.4.4.7 Preventative Functional Maintenance..................................................................................... 97 6.4.4.8 Aesthetic Maintenance.............................................................................................................. 97 6.4.5 O&M Forms, Logs, and Reporting................................................................................................... 97 6.4.5.1 Requirements for Tracking and Reporting Inspections and Maintenance .......................... 97 6.4.5.2 Overview of Inspection and Maintenance Reporting, Data Management, and Forms ....... 98 6.4.5.3 Notifications............................................................................................................................... 98 www.arcadis.com v City of Sebastian Stormwater Master Plan Update 7 8 6.4.5.4 Coordination with Other Agencies.......................................................................................... 98 6.4.5.5 Reporting Safety Hazards......................................................................................................... 99 6.4.5.6 Completion of Standard Inspection and Maintenance Forms .............................................. 99 6.4.6 O&M Schedules................................................................................................................................. 99 6.4.6.1 Scheduling Routine Inspection and Maintenance.................................................................. 99 6.4.6.2 Recurring Schedule................................................................................................................... 99 6.4.6.3 Adjustments to Recurring Schedule and Adaptive Management ......................................... 99 6.4.6.4 Scheduling Inspection -Driven Maintenance......................................................................... 100 6.4.6.5 Weather and Other Conflicts.................................................................................................. 100 6.4.6.6 Unscheduled Maintenance..................................................................................................... 100 6.4.6.7 Inspection Follow-up Protocols............................................................................................. 100 6.4.6.8 Documenting and Reporting Problems................................................................................. 100 6.4.6.9 Initiating Corrective Maintenance.......................................................................................... 101 6.4.6.10 Adding New Assets to the Schedule................................................................................. 101 6.4.6.11 Scheduling Capital Replacements..................................................................................... 101 6.4.7 Personnel, Equipment, and Budget Needs................................................................................... 102 6.4.7.1 O&M Cost Model...................................................................................................................... 102 6.4.7.2 Personnel and Equipment Requirements............................................................................. 102 6.4.7.3 Budget Requirements............................................................................................................. 103 Alternatives Development and CIP Prioritization..................................................................................... 106 7.1 Previously Identified CIP Projects..................................................................................................... 106 7.2 Current and Proposed CIP Projects.................................................................................................. 108 7.2.1 Cost Estimate Criteria..................................................................................................................... 113 7.3 CIP Prioritization Process/Tool.......................................................................................................... 113 7.4 Recommended and Prioritized Improvements................................................................................. 117 Funding Plan and Grant Management....................................................................................................... 118 8.1 City Stormwater Department Revenue Sufficiency Analysis.......................................................... 118 8.1.1 Overview........................................................................................................................................... 118 8.1.2 General Methodology...................................................................................................................... 118 8.1.3 Data Used in the Analysis............................................................................................................... 119 8.1.3.1 Data Items................................................................................................................................. 119 8.1.3.2 Working Capital Reserves and Balances.............................................................................. 119 8.1.3.3 Sources of Funds from FY2022-2023 Draft Stormwater Budget ......................................... 119 8.1.3.4 Uses of Funds from FY2022-2023 Proposed Stormwater Budget ...................................... 119 www.arcadis.com vi City of Sebastian Stormwater Master Plan Update 8.1.3.5 Capital Improvements Plan (CIP)........................................................................................... 120 8.1.3.6 Arcadis O&M Model................................................................................................................. 120 8.1.3.7 General Assumptions.............................................................................................................. 121 8.1.4 Financial Management and Goals of the Stormwater Utility....................................................... 121 8.1.4.1 Minimum Working Capital Reserves in the Operating Fund ............................................... 121 8.1.5 Results of the Baseline Stormwater Revenue Sufficiency Analysis .......................................... 122 8.1.5.1 Summary Pro Forma and Revenue Increases Required ..................................................... 122 8.2 Grant Funding Overview..................................................................................................................... 125 8.2.1 Federal Funding Opportunities...................................................................................................... 125 8.2.1.1 Florida Department of Environmental Protection State Revolving Fund .......................... 125 8.2.1.2 Water Infrastructure Finance and Innovation Act................................................................ 126 8.2.1.3 Florida Department of Environmental Protection Nonpoint Source Funds ...................... 127 8.2.1.4 Florida Department of Environmental Protection Coastal Management Program ........... 128 8.2.1.5 Florida Division of Emergency Management Building Resilient Infrastructure and Communities Grant Program.......................................................................................... 129 8.2.1.6 Florida Division of Emergency Management Flood Mitigation Assistance Program....... 130 8.2.1.7 Florida Division of Emergency Management Hazard Mitigation Grant Program .............. 132 8.2.1.8 Florida Department of Economic Opportunity CDBG-DR................................................... 133 8.2.1.9 Florida Department of Economic Opportunity CDBG-MIT.................................................. 133 8.2.1.10 Florida Department of Economic Opportunity Small Cities CDBG Program ................ 134 8.2.1.11 EDA Public Works and Economic Adjustment Assistance Program ............................. 135 8.2.1.12 US Treasury State and Local Fiscal Recovery Funds ..................................................... 136 8.3 State Funding Opportunities.............................................................................................................. 136 8.3.1 St. Johns River Water Management District Districtwide Cost Share Funding Program(FY2023-24)....................................................................................................................... 136 8.3.2 Florida Department of Environmental Protection Resilient Florida Program ........................... 137 8.4 Grant Funding Recommendations..................................................................................................... 138 9 Conclusions and Recommendations........................................................................................................ 142 9.1 Operational Recommendations......................................................................................................... 142 9.2 Policy and Local Ordinance Recommendations.............................................................................. 144 www.arcadis.com vii City of Sebastian Stormwater Master Plan Update Tables Table 1-1. Level of Service from Available Sources................................................................. Table 1-2. Water Quality Requirements................................................................................... Table 2-1. City of Sebastian USDA/NRCS Soil Types............................................................. Table 2-2. City of Sebastian Soil Drainage Classes................................................................. Table 2-3. CIP Projects Completed Since 2006....................................................................... Table 3-1. Outfall Locations...................................................................................................... Table 3-2. Manning's, n, Roughness Coefficients.................................................................... Table 3-3. Outfall Boundary Conditions.................................................................................... Table 3-4. Green-Ampt Parameters assigned City of Sebastian USDA/NRCS Soil Types..... Table 3-5. Green-Ampt Parameters assigned to Subcatchments West of the Coastal Divide Table 3-6. Subcatchment Hydrology Parameters.................................................................... Table 3-7. Design Storm Rainfall Depths and Distributions..................................................... Table 4-1. Contaminant Sources.............................................................................................. Table 4-2. Typical Pollutant Loadings from Urban Runoff by Land Use (lbs./acre-year)......... Table 4-3. Florida Surface Water Classifications..................................................................... Table 4-4. City of Sebastian TN and TP Required Reductions and Allowable Loadings......... Table 6-1. Stormwater Department Staffing............................................................................. Table 6-2. O&M Equipment Summary ...................................................................................... Table 6-3. Current Operational Responsibilities and Maintenance Activities ........................... Table 6-4. BMP Asset Categories............................................................................................ Table6-5. Inspection Types..................................................................................................... Table 6-6. Routine SWMS Maintenance Activities................................................................... Table 6-7. O&M Cost Model Staffing Summary....................................................................... Table 6-8. O&M Equipment Summary ...................................................................................... Table 6-9. O&M Annual Budget Summary............................................................................... Table 7-1. Previously Identified CIP Projects Eliminated or Replaced ..................................... Table 7-2. Current and Proposed CIP Projects........................................................................ Table 8-1. Summary Pro Forma............................................................................................... Table 8-2. Funding Recommendations by Project Type ......................................................... Table 8-3. Funding Recommendations by Source/Opportunity.............................................. 4 6 19 19 .21 .31 .33 .34 . 37 .38 .38 .38 .46 .46 .60 .64 .74 .74 .76 .85 .85 .89 102 103 104 106 108 123 139 140 www.arcadis.com viii City of Sebastian Stormwater Master Plan Update Figures Figure 1-1. Central Indian River Lagoon BMAP Project Zones............................................................................... 12 Figure 2-1. Geology and Physiographic Features of Indian River County (from NRCS)........................................ 18 Figure3-1. Bulkhead Toe Failure............................................................................................................................ 26 Figure 3-2. Observed Drainage Conditions............................................................................................................. 27 Figure 3-3. Hydrologic and Hydraulic Modeling Extents......................................................................................... 30 Figure 3-4. Surface Flooding Locations & Volumes, 10yr-24hr Design Storm ........................................................ 42 Figure 3-5. Surface Flooding Locations & Volumes, 25yr-24hr Design Storm ........................................................ 43 Figure 3-6. Surface Flooding Locations & Volumes, 100yr-24hr Design Storm ...................................................... 44 Figure 4-1. Typical Retention Pond Design (from SJRWMD)................................................................................. 51 Figure 4-2. Typical Dry Detention Basin Design (from SJRWMD).......................................................................... 52 Figure 4-3. Typical Underdrain System Design (from SJRWMD)........................................................................... 53 Figure 4-4. Typical Wet Detention System Design (from SJRWMD)...................................................................... 54 Figure 4-5. Typical Exfiltration Trench Design (from SJRWMD)............................................................................. 56 Figure 4-6. Typical Swale Design (from SJRWMD)................................................................................................ 57 Figure 4-7. FlogardTM Inlet Filter and Exploded View.............................................................................................. 58 Figure 4-8. CIRL Project Zone SEB - TN Reductions Progress (2020).................................................................. 63 Figure 4-9. CIRL Project Zone SEB - TP Reductions Progress (2020).................................................................. 64 Figure 5-1. NOAA Tide Station No. 8721604 Historical Data................................................................................. 67 Figure 5-2. Current Conditions — NOAA Sea Level Rise Viewer............................................................................ 69 Figure 5-3. One Foot Sea Level Rise — NOAA Sea Level Rise Viewer.................................................................. 70 Figure 5-4. Two Foot Sea Level Rise — NOAA Sea Level Rise Viewer.................................................................. 70 Figure 6-1. City of Sebastian Stormwater Management Zones.............................................................................. 75 Figure 7-1. CIP Priority Criteria Weighting............................................................................................................ 114 Figure 7-2. CIP Prioritization Project Scorecard.................................................................................................... 115 Figure 7-3. CIP Prioritization Scoring Summary.................................................................................................... 116 Figure 7-4. CIP Prioritization Scoring — Criticality vs. Effectiveness..................................................................... 117 Figure 8-1. Revenues vs. Expenses (including annual revenue increases)......................................................... 124 Figure 8-2. Stormwater Utility Revenue Fund — Fund Balance (including annual revenue increases) ................. 124 www.arcadis.com ix City of Sebastian Stormwater Master Plan Update Appendices A National Pollutant Discharge Elimination System Municipal Separate Storm Sewer System Permit B Central Indian River Lagoon Basin Management Action Plan C Indian River Lagoon National Estuary Program Comprehensive Conservation and Management Plan D Integrated Pest Management Plan E United States Department of Agriculture / Natural Resources Conservation Service Soil Survey Report F NOAA National Geodetic Survey Coordinate Conversion and Transformation Tool G NOAA Atlas 14 Precipitation Frequency Data H Inspection & Maintenance Standard Operating Procedures I Capital Improvement Plan Detailed Cost Estimates J Stormwater Asset GIS Database K Stormwater Network Summary Tables www.arcadis.com x City of Sebastian Stormwater Master Plan Update Acronyms and Abbreviations ac Acres AST Above -ground Storage Tank (Petroleum) BMAP Basin Management Action Plan BMP Best Management Practice BOD Biochemical Oxygen Demand CCMP Comprehensive Conservation and Management Plan CFR Code of Federal Regulations CIP Capital Improvement Plan CIRL Central Indian River Lagoon (the) City City of Sebastian CMMS Computerized Maintenance Management System COD Chemical Oxygen Demand CoR County Road CR Citizen Request CWA Clean Water Act DEM Division of Emergency Management DO Dissolved Oxygen ECFTX East Central Florida Transient Expanded Model EOS Extent of Service ERU Equivalent Residential Unit F.A.C. or FAC Florida Administrative Code FDEP Florida Department of Environmental Protection FDOH Florida Department of Health FDOT Florida Department of Transportation FEMA Federal Emergency Management Agency F.S. Florida Statutes ft Foot FWRA Florida Watershed Restoration Act GDC General Development Corporation GI Green Infrastructure www.arcadis.com xi City of Sebastian Stormwater Master Plan Update GIS Geographic Information System GISB Grate Inlet Skimmer BoxTM GMSL Global Mean Sea Level H&H Hydrologic and Hydraulic HAB Harmful Algal Bloom HMGP Hazard Mitigation Grant Program HSG Hydrologic Soil Groups HTF High Tide Flooding ICPR Interconnected Channel and Pond Routing (model) IPC Intergovernmental Panel on Climate Change IPM Integrated Pest Management IRFWCD Indian River Farms Water Control District IRL Indian River Lagoon IRLCCMP Indian River Lagoon Comprehensive Conservation and Management Plan IRLNEP Indian River Lagoon National Estuary Program kg Kilogram km Kilometer LA Load Allocation Ibs Pounds LDC Land Development Code LDR City of Sebastian Land Development Regulation LET Load Estimation Tool LOS Level of Service m Meter MCM Minimum Control Measures mgd Million Gallons Per Day mg/L Milligrams Per Liter MHHW Mean Higher High Water MS4 Municipal Separate Storm Sewer System mt Metric Tons N/A Not Applicable www.arcadis.com xii City of Sebastian Stormwater Master Plan Update NAVD88 North American Vertical Datum of 1988 NCAT National Geodetic Survey Coordinate Conversion and Transformation Tool NEP National Estuary Program NGVD National Geodetic Vertical Datum NIRL North Indian River Lagoon NOAA National Oceanic and Atmospheric Administration NOD Nitrogenous Oxygen Demand NOI Notice of Intent NPDES National Pollutant Discharge Elimination System NRCS Natural Resources Conservation Service O&M Operations and Maintenance OSTDS Onsite Sewage Treatment and Disposal System PE Professional Engineer PLSM Pollutant Load Screening Model PUD Planned Unit Development R&R Renewal and Replacement RSL Relative Sea Level SFWMD South Florida Water Management District SJRWMD St. Johns River Water Management District SIRL South Indian River Lagoon SMPU Stormwater Master Plan Update SOP Standard Operating Procedure SR State Road SRID Sebastian River Improvement District SRWCD Sebastian River Water Control District SU Stormwater Utility SWIL Spatial Watershed Iterative Loading SWIM Surface Water Improvement Management SWMP Stormwater Management Program SWMS Stormwater Management System SWPPP Stormwater Pollution Prevention Plan www.arcadis.com xiii City of Sebastian Stormwater Master Plan Update TMDL Total Maximum Daily Load TN Total Nitrogen TP Total Phosphorus TSS Total Suspended Solids USACE U.S. Army Corps of Engineers USDA United States Department of Agriculture USEPA U.S. Environmental Protection Agency USGS U.S. Geological Survey WBID Waterbody Identification (number) WCD Water Control District WLA Waste Load Allocation WMD Water Management District WSL Water Surface Level WWTF Wastewater Treatment Facility yr Year www.arcadis.com AV