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Mudboils

Mudboils. AEES Pre-Conference Workshop Wednesday, June 6, 2012 Nate Barlet Brandon Winfrey Roy Wood. Problem Statement. Turbidity in Onondaga Creek too high to support species historically present

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Mudboils

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  1. Mudboils AEES Pre-Conference Workshop Wednesday, June 6, 2012 Nate Barlet Brandon Winfrey Roy Wood

  2. Problem Statement • Turbidity in Onondaga Creek too high to support species historically present • Sediment load to the creek from mudboils has been identified as major contributor to turbidity

  3. Goals and Objectives • Improve Onondanga Creek to support fish species present upstream of the mudboils • Intercept 100% of sediment load from mudboils. • This will protect river ecosystem from ever being affected by mudboil sediments that increase turbidity

  4. Design Constraints • Landowner • Honeywell • Hydrogeology • Unclear • Environmental • Energy • Cost • Dredging maybe required

  5. Potential Solutions (1) • One Large Relief Well • Attempt to create mudboil in the existing area to control source of sediment • “One Well to Rule them All” • Advantages: • Control source • Easier to design sediment abatement • Disadvantages: • Unclear if control is possible • Low flexibility if other mudboils appear

  6. Potential Solutions (2) • Divert Creek around mudboils, Contain mudboils • Build impoundment around entire area • Move creek channel into field adjacent • Advantages: • Creek avoids sediment loading (never impacted) • Mudboilspotentially capped by hydraulic head • Disadvantages: • Expensive • May create mudboils down gradient • Creek channel may migrate back to mudboil area

  7. Potential Solutions (3) • Impoundment around rogue mudboil, Wetland for smaller particle removal, relief wells • Build impoundment around rogue mudboil followed by wetland • Surround impoundment by relief wells • Construct levee to protect creek • Advantages: • Protects creek from incoming sediment • Provides ecological and aesthetic service • Flexible design • Disadvantages: • Storm events could decrease sediment capacity • Annual dredging required • Large land area required

  8. Design Overview • Relief Wells assumed to control flow from mudboils to not exceed 400 gpm • Impoundment designed to contain particles > 4 μm • Wetland designed to remove smaller particles (< 2 μm) • Levee high enough to protect creek from storm events

  9. Relief Well Design • Install 4 relief wells surrounding impoundment berm • 5” diameter with screens excluding sand size particles • Installing 1 well next to mudboil can potentially reduce hydraulic head by 15 ft. • Install wells 20 ft. from mudboil vent to prevent intercepting sediment flow in vent

  10. Impoundment Design (1) • Dredging is unavoidable • Annual dredging • Design to remove 4 μmparticles • Settling velocity of 6 x 10-4 cm/s • 38 hr detention • design driven by solids dredging annually, not settling time requirements

  11. Impoundment Design (2) • 35 meter diameter • 6 ft high • 3 feet water level design • walls are 3 foot wide top, 3:1 slope, 13 ft bottom

  12. Profile View: Impoundment Drains to Wetlands Mudboil cone

  13. Wetland Design (1) • Sheet flow over vegetation to remove particles smaller than 2 μm. • 155 acres • size driven by solids limit to 2 cm/yr depth • <1 acre needed for solids removal retention time

  14. Profile View: Wetland 4 % slope

  15. Design Overview

  16. Estimated Cost • $45,000 based on $15/cu. yd. • Includes berms for access to impoundment and levee • $5 million for bio-swale • Based on estimated cost per acre of $35,000

  17. Other Considerations • Problem of source too large to contain • Salinity diluted in stream to lower levels • Salinity in relief wells presumed to decrease (drawing from freshwater aquifer) • Not included in treatment goal • Snowfall my decrease residence time in winter • Do relief wells control flow from mudboils to below historic high flows? • Studies on effects of relief wells on mudboil flow should be done • Pilot-scale study on effectiveness of wetland • Vegetation response to sediment over time • Fine particle removal rates • Construction should occur in phases • Install relief wells first, allow some time for mudboils to react (1-2 years) • Build levees and impoundment around stabilized mudboils (1-2 years) • Construct wetland, route water from impoundment through wetland (20-year design life)

  18. Summary • As designed, sediment load from mudboils intercepted before entering Odondanga Creek • Ecological buffer (wetland) between mudboils and creek should enhance recovery of fish populations • Levee would prevent resuspension and conveyance of sediment to creek during storm events • While dredging required, sediment has astringent qualities that could have market value as a cosmetic product

  19. Questions?

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