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Gene Yagow Virginia Tech Biological Systems Engineering Dept.

Moore’s Creek and Lodge Creek, Meadow Creek and Schenks Branch ----------------------------------------------- Draft Sediment TMDL Report Update. Gene Yagow Virginia Tech Biological Systems Engineering Dept. Technical Advisory Committee Meeting February 9, 2012 Charlottesville, VA.

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Gene Yagow Virginia Tech Biological Systems Engineering Dept.

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  1. Moore’s Creek and Lodge Creek, Meadow Creek and Schenks Branch -----------------------------------------------Draft Sediment TMDL Report Update Gene Yagow Virginia Tech Biological Systems Engineering Dept. Technical Advisory Committee Meeting February 9, 2012 Charlottesville, VA

  2. Impaired Segments and Watersheds

  3. Basis for Impairment Moore’s Creek (MSC) Lodge Creek (XRC) Meadow Creek (MWC) Schenks Branch (SNK) Unnamed Trib (XSN) Biological Metrics Abundance Diversity Pollution tolerance SCI = Stream Condition Index

  4. Existing Loads, Reference Loads, and TMDLs

  5. TMDL Components TMDL = ƩWLA + ƩLA + MOS + FG where TMDL = total maximum daily load; WLA = wasteload (permitted) allocations; LA = load (nonpoint) allocations; MOS = margin of safety; and FG = future growth allocation (1%).

  6. MS4 Delineation

  7. Lodge Creek Sediment Loads and TMDL Existing and Reference Sediment Loads The Sediment TMDL (tons/yr)

  8. Moore’s Creek* Sediment Loads and TMDL Existing and Reference Sediment Loads * Excludes Lodge Creek The Sediment TMDL (tons/yr)

  9. Schenks Branch Sediment Loads and TMDL Existing and Reference Sediment Loads The Sediment TMDL (tons/yr)

  10. Meadow Creek* Sediment Loads and TMDL Existing and Reference Sediment Loads * Excludes Schenks Branch The Sediment TMDL (tons/yr)

  11. Allocation Scenarios

  12. Alternate Allocation Scenarios #1: Incorporates statewide BMPs used in the Virginia WIP to achieve downstream TMDLs (% reductions calculated from results) • Baseline + BMPs = Allocation • % reduction = (baseline – Allocation)/baseline #2: Trial-and-error (% reductions changed first) • Baseline * % reduction = Allocation

  13. Lodge Creek Sediment Load Allocation

  14. Moore’s Creek* Sediment Load Allocation * Excludes Lodge Creek

  15. Shenks BranchSediment Load Allocation

  16. Meadow Creek* Sediment Load Allocation * Excludes Schenks Branch

  17. Next Steps • Conduct a final public meeting for the TMDL portion of the study • Setup work groups to transition to Implementation Planning • Account for progress already made in the watersheds

  18. Progress Identified in 01/18/12 Call • Meadow Creek: • entire length natural channel design and restoration (Now – Dec 2012) • Sewer interceptor replacement near completion • Stream Restoration BMP credits being revised • Moore’s Creek: • 40-ac residential area being treated by constructed wetland (Fall 2012 – Spring 2013) • Ragged Mtn Dam mitigation plan includes a 4-ac wetland (soon) • Coordination with Moore’s Creek bacteria IP implementation through 319 funding • Coordination with Bay TMDL WIP

  19. Questions? • For more information, contact Gene Yagow 540-231-2538 eyagow@vt.edu

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