Water Quality Standards 303d List Total Maximum Daily Loads

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Water Quality Standards303(d) ListTotal Maximum
Daily Loads

• Phil Schroeder
• Water Protection Program
• Missouri Department of Natural Resources

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Water Quality Based Process
Conduct monitoring
Set goals and WQS
Develop and Implement strategies to restore
water quality
Meeting WQS?
Prepare 303(d) List
Yes
No
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Water Quality Standards
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Goal of the Clean Water Act

• Section 101(a)
• Restore and maintain the chemical, physical, and
  biological integrity of the Nations waters
• Wherever attainable, provide for protection and
  propagation of fish, shellfish, and wildlife and
  provide for recreation in and on the water
  (fishable / swimmable)

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Water Quality Standards

• Specific (Numeric) Criteria
• General (Narrative) Criteria
• Antidegradation Policy and Procedure
• Water Classification and Use Designations

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Water Classification

• Lakes (455 - 293,257.8 acres)
• L1 - Primarily Used for Drinking Water Supply
• L2 - Major Reservoirs
• L3 - Other Lakes
• Streams (3761 - 22,231.2 miles)
• P - Permanent Flow
• P1 - Standing Water Reaches of Class P Streams
• C - Intermittent Flow
• Wetlands - Class W
• Unclassified Waters - Class U

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Use Designations

• Aquatic Life
• Swimming
• Boating
• Livestock Watering
• Irrigation
• Fish Consumption
• Drinking Water Supply

• Industrial Process Water
• Historic Preservation
• Hydrologic Cycle Maintenance
• Educational/Scientific Significance

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Use Attainability Analysis

• Use Assessment Criteria - 131.10(g)
• 1 - Naturally Occurring Pollutant Concentrations
• 2 - Insufficient Flow
• 3 - Non-Remedial Human Caused Conditions
• 4 - Hydrologic Modifications
• 5 - Natural Physical Conditions
• 6 - Remedy Causes Socio-Economic Hardship

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More on Use Designation

• Attainable Use
• Existing Use
• Designated Use
• Presumed Use

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Specific Criteria10 CSR 20-7.031(4)

• Table A - Numeric Criteria
• Table B1 - Acute Ammonia
• Tables B2 and B3 - Chronic Ammonia
• New Table ( K)? - Site-Specific Criteria

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Other Tables

• Table C - Streams Cold Water Sport Fishery
• Table D - Outstanding State Resource Waters
• Table E - Outstanding National Resource Waters
• Table F - Metropolitan No-Discharge Streams
• Table G - Lake Classifications and Use
  Designations
• Table H - Stream Classifications and Use
  Designations
• Table I - Biocriteria Reference Streams
• Table J - Losing Streams

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General Criteria 10 CSR 20-7.031(3)

• Narrative Criteria
• Prohibits Any Observable Impairment to Beneficial
  Uses
• Applies to All Waters of the State

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Antidegradation

• Discharging additional pollutants to Waters of
  the State is prohibited unless specific
  conditions are demonstrated.

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Tiers of Antidegradation Protection10 CSR
20-7.031(2)

• Tier 1- Water quality is at, near or below WQS
• Tier 2 - Water quality is better than WQS and
  degradation is allowed when justified
• Tier 3 - Outstanding National and State Resource
  Waters. No degradation allowed.

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High Quality
Existing Water Quality
Available Assimilative Capacity
Water Quality Standard
Beneficial Use Impairment
Low Quality
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Antidegradation Review

• Alternatives Analysis
• Demonstrated Social and Economic Importance
• Highest Regulatory Requirements are met
• Approved Watershed Management Plans for Nonpoint
  Sources are implemented
• Public Participation

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Antidegradation Implementation Procedure

• Required of all state programs
• Final draft of Missouris procedure to be
  presented to the Missouri Clean Water Commission
  on April 20, 2007
• If approved, must be promulgated into rule and
  accepted by EPA

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303(d) List
List of waters were regulatory actions have been
unsuccessful in addressing the control of
pollutants to the extent necessary to prevent
impairment of waters beneficial use.
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303(d) Listing Methodology

• Requires all data be considered
• Must be scientifically sound
• Impairments based on General Criteria must be
  quantified such that a targetable threshold
  exists for the TMDL
• Significant events on a water body may effect
  usability of data

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303(d) List for 2004 / 2006

• 74 Waters
• down from 190 waters listed in 2002
• 67 TMDLs completed
• 45 have insufficient data
• 19 required new data analysis
• 11 have modified permits issued
• 10 new water quality standard
• 6 moved to category 3B (further data needed)
• 32 waters from the 2002 303(d) List
• 42 new listings

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Pollutants of Concern
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TotalMaximumDaily Loads
The amount of a specific pollutant a waterbody
can receive and still meet Water Quality Standards
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TMDLs

• Targeted for waters on the 303(d) List
• 13-year Schedule for completion
• EPA Priorities (Consent Decrees)
• State Priorities
• Certainty of impairment and source
• Data collection needs
• Grouped by region or pollutant type

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TMDL Elements

• Identify All (Total) Sources of Pollutant
• Calculate Maximum Pollutant Load
• Assign Daily Pollutant Load Allocations to Point
  Sources and Nonpoint Sources
• Address Seasonality
• Include Margin of Safety to Account for
  Uncertainty

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Key Factors in a TMDL
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TMDL Scenario
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Allocation Formula
LC (Qs Qd) WQC CF
(0.1 cfs)(2 mg/L)(5.40) 1.1 pounds per day
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Addressing Narrative CriteriaMatching the Load
Allocation to the WQ Standard

• Eutrophication
• Chl-a (ug/L) linked to P or N (mg/L)
• Turbidity
• Secchi Disk Depth (m) linked to TSS (mg/L)
• Sediments
• Bottom Coverage () linked to TSS (mg/L)
• Discoloration
• Color Match (amt. of color disparity using the
  Platinum Cobalt Visual Method) linked to Chem X

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TMDL Progress
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On the Internet...
www.dnr.mo.gov/env/wpp/tmdl/index.html