IDEM TMDL 101 Everything you wanted to know about Total Maximum Daily Loads
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Transcript of IDEM TMDL 101 Everything you wanted to know about Total Maximum Daily Loads
![Page 1: IDEM TMDL 101 Everything you wanted to know about Total Maximum Daily Loads](https://reader035.fdocuments.in/reader035/viewer/2022062720/5681353a550346895d9c9fce/html5/thumbnails/1.jpg)
IDEM TMDL 101
Everything you wanted to know about Total Maximum Daily Loads
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Presentation Overview
• The Total Maximum Daily Load Program (TMDL)
• The TMDL Development Process
• The TMDL Document
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Presentation Overview
• The Total Maximum Daily Load Program (TMDL)
• The TMDL Development Process
• The TMDL Document
![Page 4: IDEM TMDL 101 Everything you wanted to know about Total Maximum Daily Loads](https://reader035.fdocuments.in/reader035/viewer/2022062720/5681353a550346895d9c9fce/html5/thumbnails/4.jpg)
What Is a Total Maximum Daily Load?
• Identifying the pollutant
• Determining the current level of the pollutant
• Calculating the amount of the pollutant that a waterbody can receive and still meet water quality standards
• A report of pollutant sources, needed reductions, and actions necessary to improve water quality
• A tool to guide watershed planning
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History of Indiana TMDL Program
• 2001 IDEM submits first TMDL • 2005 IDEM meets submission goals from U.S. Environmental Protection
Agency (U.S. EPA) • 2006 IDEM develops and submits TMDLS
– IDEM developed first state-led multistate TMDL
• 2012– U.S. EPA submission goals have been continuously met since 2005– IDEM has developed a TMDL template designed to meet the nine elements of a
Watershed Management Plan (WMP)– IDEM has 1,055 approved TMDLs
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What Is a Watershed?
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The Definition of a TMDL
• The sum of allowable loads from point sources, waste load allocations (WLA) and nonpoint sources, load allocations (LA) plus a margin of safety (MOS)
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What Does a Total Maximum Daily Load Provide?
• Information- A description of the watershed and the water quality data on the impairment
• Sources- Overview of the potential sources of the pollutant• Loads- The amount of the pollutant of concern that a
waterbody can receive and still meet water quality standards or targets that apply to the watershed
• Reductions- A list of the pollutant load reductions necessary to meet the water quality standards or targets that apply to the watershed
• Implementation- A tool to guide watershed planning and restoration activities
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TMDL Development Selection Process• Water Quality Reports
• 305(b) - Assess water quality and report to U.S. EPA, Congress• 303(d) - Compile list of impaired waters • Product - Indiana Integrated Water Monitoring and Assessment Report
• 303(d) list• Start with 1998 and use subsequent lists to complete watershed
assessment
• New process• Watershed group request• Special projects
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Allocations
• Waste load Allocation (WLA)– WLAs are the contributions from point sources– Point sources are much easier to identify since they
have a discharge point or direct outlet to the stream– Point sources have some type of monitoring or
information and are therefore easier to assign loadings
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Allocations• Load Allocation (LA)
– LAs are the pollutant contributions from nonpoint sources, which are not directly regulated
– "Diffuse" pollution, generated from large areas with no particular point of pollutant origin, but rather from many individual places
– Pollution that cannot be traced to a regulated direct outlet or discharge point
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Allocations
• Margin of Safety (MOS)– MOS may be either implicit or explicit– Implicit
• Incorporated into the TMDL through conservative assumptions in the analysis
– Explicit• Expressed in the TMDL as loadings set aside for the
MOS
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Presentation Overview
• The Total Maximum Daily Load Program (TMDL)
• The TMDL Development Process
• The TMDL Document
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What Is the TMDL Process?• Review 303(d) list and sampling data • Conduct additional monitoring • Reassess waterbodies• Gather information and produce draft TMDL report• Draft TMDL stakeholder meeting• 30-day comment period• Revise draft TMDL and respond to comments on draft final
TMDL• Submit TMDL to U.S. EPA and receive final TMDL approval
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What Are Impaired Waters?• Waterbodies sampled for water quality, assessed by
IDEM and listed on the 303(d) List of Impaired Waters
• Waterbodies where a “use” is adversely affected– Fishable, Swimmable, Drinkable
• Waterbodies then sampled for TMDL magnitude and extent of impairment
• Streams are then reassessed
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Indiana’s Most Common Water Quality Impairments
• Problems:– E. coli– Impaired Biotic Communities– Statewide fish consumption advisory
• Mercury• PCB
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Internal Data Gathering• ArcGIS map of area• 303(d) listing
information• Assessment database• Land use
• Confined Feeding Operations
• Concentrated Animal Feeding Operations
• NPDES permits• NPDES violations• Enforcement cases
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External Data Gathering• Stakeholders
• Soil and Water Conservation Districts
• Health Departments
• Federal and State Government Agencies
• Watershed Groups
• Purdue Extension Offices
• Universities
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Presentation Overview
• The Total Maximum Daily Load Program (TMDL)
• The TMDL Development Process
• The TMDL Document
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The TMDL Document
• Overview of watershed condition• Identification of sources• Discussion of analytical process• Load reductions needed• Current and past water quality improvement
efforts• Recommended actions
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What Does a Total Maximum Daily Load Provide?
• Information- A description of the watershed and the water quality data on the impairment
• Sources- Overview of the potential sources of the pollutant• Loads- The amount of the pollutant of concern that a waterbody can
receive and still meet water quality standards or targets that apply to the watershed
• Reductions- A list of the pollutant load reductions necessary to meet the water quality standards or targets that apply to the watershed
• Implementation- A tool to guide watershed planning and restoration activities
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TMDL Goals• IDEM is committed to a stakeholder-driven
process
– Collecting information from local stakeholders
– Providing staff to communicate with stakeholders and share information
– Watershed specialists assist with watershed management plan (WMP) development
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Putting it All Together
Locally Led Work to Improve Water
Quality
Nonpoint Source Grants
Program
Total Maximum
Daily Loads
(TMDL)
Watershed Specialists
303(d) List and 305(b) Report
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Questions?
Staci GoodwinSenior TMDL Project ManagerOffice of Water QualityIndiana Department of Environmental Management100 North Senate AvenueIndianapolis, Indiana 46204
Phone: (317) 308-3387Fax: (317) 308-3219E-mail: [email protected]