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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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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

basis for impairment
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

tmdl components
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%).

lodge creek sediment loads and tmdl
Lodge Creek Sediment Loads and TMDL

Existing and Reference Sediment Loads

The Sediment TMDL (tons/yr)

moore s creek sediment loads and tmdl
Moore’s Creek* Sediment Loads and TMDL

Existing and Reference Sediment Loads

* Excludes Lodge Creek

The Sediment TMDL (tons/yr)

schenks branch sediment loads and tmdl
Schenks Branch Sediment Loads and TMDL

Existing and Reference Sediment Loads

The Sediment TMDL (tons/yr)

meadow creek sediment loads and tmdl
Meadow Creek* Sediment Loads and TMDL

Existing and Reference Sediment Loads

* Excludes Schenks Branch

The Sediment TMDL (tons/yr)

alternate allocation scenarios
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
next steps
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
progress identified in 01 18 12 call
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
questions
Questions?
  • For more information, contact

Gene Yagow

540-231-2538

eyagow@vt.edu