tmdls on the clearwater river
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TMDLs on the Clearwater River. Fecal Coliform Impairment of the Trout Stream Portion of the Clearwater River By Corey Hanson Water Quality Coordinator Red Lake Watershed District. Explanation of Impairment. - PowerPoint PPT PresentationTRANSCRIPT
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TMDLs on the Clearwater RiverFecal Coliform Impairment of the Trout Stream Portion of the Clearwater River
ByCorey Hanson
Water Quality CoordinatorRed Lake Watershed District
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Explanation of Impairment• The trout stream reach of the Clearwater River is impaired by fecal coliform,
begins at the Clearwater/Beltrami County Line, and ends at Clearwater Lake. • Listed on the 2002 303(d) List and remains listed on the 2004 303(d) List of
Impaired Waters
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RLWD Role in TMDL Study
• Fiscal Agent• Project Administration• Monitoring• Water quality data
collection and analysis• Water quality
modeling using FLUX• Load allocation• Report writing
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Characteristics of the Impaired Reach
• Land Use• Runoff• Physical
Characteristics of the stream
• Possible Sources of fecal coliform
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Land Use• 32% Forest• 27% Grass/Pasture• 19% Ag• 11% Water/Wetland• 8% Urban/Rural
Development• 3% Other
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Runoff Potential
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Physical Characteristics• The gradient and velocity of the stream increase prior to the trout stream
reach. • Fecal coliform suitability decreases.
Upstream of the Trout Stream Reach Trout Stream Reach
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Weighted Average Fecal Coliform Levels from FLUX Modeling
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Possible Sources of Fecal Coliform Bacteria
• High Probability– Overflows from Bagley
Sewage Treatment Facility (Has been improved to eliminate overflows)
– Stormwater from the City of Bagley (Stormwater ponds have been constructed to reduce amount of pollutants entering river)
– Wildlife
• Low Probability/Unknown– City of Bagley
wastewater Treatment (Not a large contribution)
– Feedlots– Hydrologic Modification– Fecal Coliform deposited
in calcareous fens/bogs (under investigation)
– Sampling Techniques
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Monitoring Conducted for use in the TMDL Project
• Clearwater Nonpoint Study – 1992-93• Clearwater Lake Water Quality Model Study
– 2002 - 6 stream sites, bi-weekly monitoring
• RLWD Long Term District Monitoring– Quarterly monitoring since mid-80’s– Data entry into STORET just recently completed, not in time for
2004 303(d) list
• Clearwater Soil and Water Conservation District– Intensive fecal coliform monitoring for this TMDL Project from
August 2002 – October 2002– Samples analyzed by Minnesota Department of Health, data is
currently available in STORET
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Clearwater Lake Water Quality Model Monitoring Sites
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RLWD District Monitoring Sites in the Cleawater Lake Watershed
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SWCD/MDH Monitoring Sites
CR #25
Hwy #2 3-Mile Road
CR #22
CR #24 (inlet)
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Methods for Determination of Impairment
• From the MPCA Guidance Manual for Assessing the Quality of Minnesota Surface Waters for Determination of Impairment – 305(b) Report and 303(d) List.
• Section VIII. Assessment Based on Numeric Standard for Protection of Recreation
• For Class 2A waters (trout streams)• Pollutant – Fecal Coliform
– Affects swimming and other forms of recreation that involve contact with the water
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Methods for Determination of Impairment – Fecal Coliform1. Standard = 200 organisms per 100 ml of water2. Geometric mean of 5 + samples in one month, or 3. If information from #2. is not available, find % of
samples exceeding the standard within the most recent 10 years (at least 10 data points). If >10%, the stream is considered potentially impaired and moves on to the next step of the assessment process
4. Data aggregated by month. 5. If geometric mean for >2 months exceed 200
col/100ml, reach placed on 305(b) not supporting list and placed on the 303(d) impaired list.
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Data used for original impairment
• Clearwater Nonpoint Study Data• Impairment found at Clearwater
Lake Inlet Monitoring Site– Samples taken April 1992-May 1993
• 36.84% of samples were >200col/ml– Geometric Means of 3 months were
> 200col/ml– Only 1 yr of sampling– Less than 5 samples per aggregate
month
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Using Data Available for 2004 303(d) List
• Sampling data from October 1992 – September 2002• All sites within the Clearwater Lake watershed
qualify as fully supporting in the first step of data assessment
• Shaded Sites are in the trout stream reach2004 Assessment of most Recent 10 Years of DataStep 1 Upstream
Site CL Inlet CSAH 22 3-Mile Road Hwy 2 CR #25% of samples that exceed standards 6.25% 7.14% 0.00% 0.00% 0.00%Fully Supporing (<10%) X X X X XPotentially Impaired (>10%)
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Using All Available Data• Last 10 years of data currently in STORET and
RLWD District Monitoring data that will be entered into STORET
• All sites upstream of Clearwater Lake qualify as fully supporting in the first step of data assessment
Assessment of Most Recent 10 Years of Data From All SourcesStep 1 Upstream
Site CL Inlet CSAH 22 3-Mile Road Hwy 2 CR #25Percent of samples that exceed standards 3.45% 7.14% 0.00% 4.55% 6.52%Fully Supporing (<10%) X X X X XPotentially Impaired (>10%)
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Why there is no longer an impairment
• Improvements to the Bagley Sewage Treatment Facility
• Stormwater Treatment Pond Construction
• Best Management Practices
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Next Steps• Include load allocations, etc. in order to prevent
the reach from becoming impaired in the future• Write TMDL Report• Delisting of the reach• Published TMDL
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The End