Title: Water Quality Standards 303d List Total Maximum Daily Loads
1Water Quality Standards303(d) ListTotal Maximum
Daily Loads
- Phil Schroeder
- Water Protection Program
- Missouri Department of Natural Resources
2Water 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
3Water Quality Standards
4Goal 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)
5Water Quality Standards
- Specific (Numeric) Criteria
- General (Narrative) Criteria
- Antidegradation Policy and Procedure
- Water Classification and Use Designations
6Water 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
7Use Designations
- Aquatic Life
- Swimming
- Boating
- Livestock Watering
- Irrigation
- Fish Consumption
- Drinking Water Supply
- Industrial Process Water
- Historic Preservation
- Hydrologic Cycle Maintenance
- Educational/Scientific Significance
8Use 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
9More on Use Designation
- Attainable Use
- Existing Use
- Designated Use
- Presumed Use
10Specific 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
11Other 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
12General 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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13Antidegradation
- Discharging additional pollutants to Waters of
the State is prohibited unless specific
conditions are demonstrated.
14Tiers 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.
15High Quality
Existing Water Quality
Available Assimilative Capacity
Water Quality Standard
Beneficial Use Impairment
Low Quality
16Antidegradation Review
- Alternatives Analysis
- Demonstrated Social and Economic Importance
- Highest Regulatory Requirements are met
- Approved Watershed Management Plans for Nonpoint
Sources are implemented - Public Participation
17Antidegradation 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
18303(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.
19303(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
20303(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
21Pollutants of Concern
22TotalMaximumDaily Loads
The amount of a specific pollutant a waterbody
can receive and still meet Water Quality Standards
23TMDLs
- 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
24TMDL 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
25Key Factors in a TMDL
26TMDL Scenario
27Allocation Formula
LC (Qs Qd) WQC CF
(0.1 cfs)(2 mg/L)(5.40) 1.1 pounds per day
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30Addressing 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
31TMDL Progress
32On the Internet...
www.dnr.mo.gov/env/wpp/tmdl/index.html