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Golden Lake TMDL Critique

Golden Lake TMDL Critique. Mayank Gupta & Karla Bussen. Golden Lake Description. Shallow Lake 57.2 acres; max depth=24 ft; mean depth= 8ft 90% littoral (<15ft) Lakeshore is well developed Class 2B: supports aquatic and recreation uses warm & cool fisheries, swimming, non-motorized boating

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Golden Lake TMDL Critique

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  1. Golden Lake TMDL Critique Mayank Gupta & Karla Bussen

  2. Golden Lake Description • Shallow Lake • 57.2 acres; max depth=24 ft; mean depth= 8ft • 90% littoral (<15ft) • Lakeshore is well developed • Class 2B: supports aquatic and recreation uses • warm & cool fisheries, swimming, non-motorized boating • Naturally brown tinted water due to tannin

  3. Watershed Description • West-central Portion of the Rice Creek Watershed District (RCWD) •  Sub-watershed of Upper Mississippi Watershed • Main tributary is Anoka County Ditch 53-62. • 6,426 acres drain to lake through the ditch and 139 acres directly drain into the lake

  4. 303d: Impaired Water • 1st listed in 2002 as an impaired water  • Aquatic recreation standards not met due to excess nutrients/eutrophication  • Targeted start/completion years: 2004/2008 (September 30,2009) • 5C – Impaired by one pollutant and no TMDL study plan is approved by EPA

  5. Water Quality Standards

  6. Water Quality Standards

  7. Water Quality Standards

  8. Water Quality Standards

  9. Curlyleaf Pondweed

  10. Sources of Phosphorous • 40% Watershed • MS4s • 14% failing septic systems • 57% Internal Loading •  anoxic conditions • physical disturbance (bottom- feeding fish and wind) • curlyleaf pondweed • 3% atmosphere 

  11. Models and Methods • Model used: BATHTUB

  12. Margin of Safety

  13. Pollution Reduction Plans Reductions designed to meet W.Q. standards from June-Sept. (growing season)

  14. Implementation Plan   Reduce total Phosphorous load in the watershed and improve in-lake water clarity.

  15. How will this be achieved? • Regulation •  management rules •  Education  •  storm water article in city paper each month •  full-time environmental education coordinator • Public Advisory Commitee • Incentives • BMPs, shoreline restoration, native landscaping, lakeshore buffers

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