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CDPHE WQCD TMDL Presentation to
Lower Arkansas Water Quality Roundtable Discussion
April 25, 2017
Introductions Colorado Department of Public Health and
Environment
Water Quality Control Division
Restoration and Protection Unit
TMDL program
Nonpoint Source (NPS) program
Water quality planning
Overview
Introduction to TMDLs
Specific TMDL work in the area
Next steps
Adopt Water Quality Standards
Monitor and Assess Waters
List Impaired Waters
Develop TMDLs (TMDL = WLA + LA + MOS)
Control Point Sources through Discharge Permits
Manage Nonpoint Sources through Voluntary Efforts
Define Water Quality Goal
Compile data/information and assess waterbody condition
303(d) Process
Implementation
Impaired water bodies and TMDLs
Clean Water Act requirement to list water bodies not meeting water quality standards (303(d) listing)
Removal from the list through several mechanisms
Total maximum daily load = allowable of a pollutant to attain water quality standards
Daily load = pounds/day
Allocated to contributing sources
How it’s allocated…
MOS 10%
LA 25%
WLA 65%
WLA + LA + MOS = TMDL
Wasteload Allocations
Point Source Discharges Point sources = discrete conveyances
such as pipes or man-made ditches
Subject to discharge permitting regulations
Permit limits must be consistent with TMDL wasteload allocation
Load Allocations
Background and Nonpoint Sources
Natural background
Nonpoint sources = runoff from many diffuse sources
Voluntary implementation through local, state and federal programs
Margin of Safety
Accounts for variability in load reduction calculations
Allows for seasonal variation
May be explicit or implicit
Public/Stakeholder Role
Provide data and information
Review and comment on impaired waters list
Review and comment on draft TMDLs
Develop implementation plans to meet required load reductions
Post TMDL
• Not self-implementing
• Discharge permits
• Implementation planning
Map here
TMDLs under Development Arkansas, Huerfano, Timpas, Chicosa,
Apishapa, and various other tribs– Matt Alms
Se, As and Mn
Lake Henry, Lake Meredith, John Martin Res., others- Joni Nuttle
Other Traditional TMDL Works In Arkansas Basin DeWeese Reservoir
Fountain Creek
Monument Creek
Wild Horse Creek
Classified Uses and Standards
Pollutant Aquatic Life Use Agriculture Domestic Water Supply
Water + Fish
Fish Ingestion
Acute Chronic
Selenium 18.4 4.6 20 (30-day) 50 (30-d) 610 4600
Point Sources Fowler WWTF
Manzanola WWTF
Rocky Ford WWTF
La Junta WWTF
Las Animas WWTF
North La Junta WWTF
Crowley Correctional Facility
Fort Lyon Correctional
Likely to be included: Town of Boone, Town of Crowley
Some sand and gravel operations need additional analyses
Current data USGS gages
Mainstem of Arkansas, Apishapa, Timpas
Division sampling sites
Routine
Supplemental in 2015-2016
Division of Water Resources
Crooked Arroyo
CSU/Gates data
Map here
Segment COARLA01c (blw John Martin) WQCD addressing segment COARLA01c with a new,
alternative approach
EPA produced guidance for expedited actions towards implementation
Requires collaboration and fairly strict milestones
Interest from local stakeholders allows for productive collaboration that leads directly to implementation and remediation efforts
Great opportunity with current project proposals
What’s Next?
Process steps for completing TMDLs
Upcoming TMDLs in the area
Info to share?
TMDL prioritization
DSV
La Junta approved; Rocky Ford & Las Animas
next?
Contact Information
Tammy Allen, 303-692-3554, tamara.allen@state.co.us
Matt Alms, 303-692-6264, matt.alms@state.co.us
Kenan Diker, 303-692-3597, Kenan.diker@state.co.us
Joni Nuttle, 303-692-3533, joni.nuttle@state.co.us
Questions?
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