Middle Illinois River TMDLs and Load Reduction Strategies - - PowerPoint PPT Presentation

Middle Illinois River TMDLs and Load Reduction Strategies

IMPLEMENTATION PLANNING

Jennifer Olson, Tetra Tech, Inc. Jennifer Clarke, Illinois EPA Chris Urban, US EPA September 6, 2012

Presentation Overview

►Project Area ►TMDL Analysis and

Conclusions

►Implementation

Planning Process

►Pilot Areas ►Questions &

Comments

Project Area

►2,100 square mile

watershed

►Illinois River Bluffs

Region

►Many tributary

inputs

►Backwater lakes

Illinois River Watershed Middle Illinois River Watershed

Why are TMDLs and LRSs needed for the Middle Illinois River watershed?

►Streams/River/Lakes not

meeting water quality goals

• Pathogens (Fecal Coliform)
• Chloride
• Manganese
• Total Dissolved Solids
• Phosphorus (lakes)
• Sediment
• Nutrients

►Three Impaired Main

Stem Segments

►Three Impaired

Tributaries

• Big Bureau
• Kickapoo
• Farm

►Two Impaired Lakes

• Depue
• Senachwine

TMDL Determined Pollutant Reduction Goals

►75% reduction in

chloride in Farm Creek

►Up to 79%

reduction in fecal coliform in Illinois River

►9-68% reduction in

TN load

►96% reduction in

TSS in Kickapoo Creek

►Up to 39%

reduction in TSS in Illinois River

►20-90% reduction

in TP load

Source Identification

►Wastewater (treatment

plants, sewer overflows, septics)

►Industrial facilities ►Stormwater runoff (urban

and agricultural)

►Erosion (bluffs, channel,

gullies)

►Animal agriculture

(stream access, AFOs)

TMDL and LRS Status

►Public comment period ended in February ►Final draft document available on Illinois

EPA website http://www.epa.state.il.us/water/tmdl/report- status.html#ill

►Still subject to US EPA review and approval ►Implementation planning efforts underway 

Focus of this meeting

Implementation Approach

► Obtain input from stakeholders on needs and

wants

► Develop a watershed approach that achieves

• bjectives

► Provide focused implementation activities

with costs and milestones

• General Implementation Plan
• BMP Optimization - Pilot Studies

► Work with local partners to review and

finalize plan

► Use adaptive management process to revisit

and refine plan in future

BMP Optimization Process

Baseline conditions Identify potential BMPs Identify watershed

• pportunities

BMP modeling Evaluate options Design and cost assumptions

Pilot Area Analysis

► Pilot area approach ► Two priority watersheds

selected for focused analysis

• Dry Run Tributary Creek

watershed

• North Farm Creek

watershed

► Watershed and BMP

modeling

► Implementation planning

Dry Run Tributary North Farm Creek

Dry Run Tributary Creek

► 1,690 acres ► Peoria and Peoria

Heights

► Tributary to Dry Run,

Kickapoo Creek, and Illinois River

► Watershed is 94%

developed

• Residential
• High School
• Commercial centers

Dry Run Tributary Creek

►High peak flows and

volumes causing stream instability, erosion, pollutant loading

►Need reductions in

bacteria, sediment, nutrients

►Sources are linked to

urban stormwater runoff

►Previous work to evaluate

channel and erosion issues

North Farm Creek Watershed

►Steep slopes,

ravines, and gullies common

►Watershed

drains to Farm Creek and Illinois River

►6,248 acres, East Peoria, Washington

North Farm Creek Watershed

►Need reductions in

sediment, nutrients, chloride

►Sources are linked to:

• Stormwater runoff
• Erosion
• Point sources
• Salt application

North Farm Creek Watershed

►Stormwater runoff

is causing gully erosion, ravine formation, and

• ther significant

erosion issues

►Existing efforts –

Steep Slope Ordinance

How Do We Solve the Problem?

► Non-structural practices

• Street and parking lot

sweeping

• Ordinances
• Education programs
• Pollution prevention

programs focused on pet waste and yard waste

• Winter road materials

management

• Conservation/Revegetation
• Others

► Structural practices

• Bioretention and rain

gardens

• Permeable pavement
• Filter strips and buffers
• Rain barrels
• Ponding
• Others

Finding the Right Balance for Implementation

►Need to identify both structural and non-

structural improvements

• How much of each? Where?

►Transfer tools to local organizations for

future use

• BMP modeling analysis for stormwater

sources ►Evaluate costs and timing considerations

BMP Modeling Analysis

► BMP Decision Support

System (BMPDSS)

• Developed by Tetra Tech

for Prince George’s County, Maryland

• An “add on” model
• Allows for optimization of

BMPs

• Integrates costs
• Models BMPs individually

and as treatment train

• Requires continuous

simulation model

• Available from PG County

► Long-Term Hydrologic

Impact Assessment (L-THIA)

• Developed by Purdue
• Provides long-term annual

averages (flow, pollutant loads)

• CN based runoff analysis

with EMCs for water quality

• Evaluates BMPs using LID

version using adjusted CN values

• Web-based, easily

accessible

Low High Level of Complexity

Next Steps

►Obtain input on pilot areas

• Watershed concerns
• Existing efforts
• Possible implementation activities

►Modeling analysis

• L-THIA, BMPDSS
• Pilot area implementation plans
• BMPs, costs, timing

►Update Middle Illinois River TMDL

implementation strategy

►Timeline – Project completion Dec 2012

Questions/Comments