Lake Barton Dredging, Restoration and Riser Modification ...
Transcript of Lake Barton Dredging, Restoration and Riser Modification ...
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A Fairfax County, VA, publication
Department of Public Works and Environmental ServicesWorking for You!
Lake Barton Dredging, Restoration and Riser Modification Project
July 16, 2019
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Lake Barton Dredging, Restoration and Riser Modification Project
Meeting Agenda
Meeting Agenda
• Introduction
• Facility Overview
• Project Need
• Project Objectives
• Work Completed
• Construction
• Next Steps
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Meeting Agenda
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Lake Barton Dredging, Restoration and Riser Modification Project
Introduction
Introduction
• Fairfax County Staff
– Aaron George, PE, CFM - DPWES Maintenance and Stormwater
Management Division
– Chris Triolo, PE, CCM – DPWES Utilities Design and Construction Division
• Design Engineering Consultant
– Eric Neast, PE - Gannett Fleming, Inc.
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Lake Barton Dredging, Restoration and Riser Modification Project
Facility Overview
Facility Overview
Lake Barton (9992WP)
• Constructed in 1978 to provide flood control by the Natural Resources Conservation Service (NRCS) with Fairfax County and Northern Virginia Soil and Water Conservation District (NVSWCD) as local sponsors
• One of six NRCS designed flood control dams in the Pohick Watershed
• Drainage Area - 538 acres (0.8 square miles)
• Surface Area - 9.6 acres
• Lake Barton Dam is regulated by the Department of Conservation and Recreation (DCR) with operation and maintenance completed by Fairfax County
• Last dredged in 2011
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Lake Barton Dredging, Restoration and Riser Modification Project
Facility Overview 5
Facility Overview
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Project Need
Lake Barton Dredging, Restoration and Riser Modification Project
Project Need
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Project Need
Lake Barton Dredging, Restoration and Riser Modification Project
Project Need
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Project Need
Lake Barton Dredging, Restoration and Riser Modification Project
Project Need
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Lake Barton Dredging, Restoration and Riser Modification Project
Project Objectives
• Dredge accumulated sediment
– Currently estimated to remove 15,700 CY
• Facility restoration
– Shoreline rehabilitation
– Riser rehabilitation
• Trash Rack
• Cold Water Intake
• Facility Improvements
– Secondary forebay
– Improvements to existing forebay
– Water quality benefits (forebay volume)
– Mid-level sluice gate
– Fish habitat
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Project Objectives
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Lake Barton Dredging, Restoration and Riser Modification Project
Work Completed
• Survey
– Bathymetric
– Topographic
– Utility
– Environmental
• Sediment Sampling
• Environmental Permitting
• Design
– 95% Design Plan
– Specifications
– Permitting
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Work Completed
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Lake Barton Dredging, Restoration and Riser Modification Project
Work Completed 11
Work Completed
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Lake Barton Dredging, Restoration and Riser Modification Project
Work Completed 12
Work Completed
Forebay
Forebay
Berm
Forebay
Berm
Riser
Improvements
Access
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Lake Barton Dredging, Restoration and Riser Modification Project
Construction
Mechanical Dredge (Dry)
• General Sequence– Initiate drawdown of lake
– Establish access and staging areas
– Establish diversion channels within lake
– Conduct dredging
• Benefits– Higher daily sediment removal rates
– Minimal sediment handling effort at disposal area
– Potentially lower cost
– Constructability of improvements
• Challenges– Very weather dependent
– Higher potential for delays due to weather
– Potential for odor from lake bottom being exposed
– Need to relocate/salvage fish
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Construction
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Lake Barton Dredging, Restoration and Riser Modification Project
Construction
Similar Projects
• Huntsman Lake
• Woodglen Lake
• Royal Lake
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Construction
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Lake Barton Dredging, Restoration and Riser Modification Project
Construction 15
Construction
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Lake Barton Dredging, Restoration and Riser Modification Project
Next Steps
• Finalize Design / Permitting / Disposal Options
– Plan, specifications, and permits to be acquired for construction
– 3 months
• Bid
– Acquire bids from qualified contractors
– 3-4 months
• Construction
– 12 months
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Next Steps
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Additional Information
For additional information, please contact
www.fairfaxcounty.gov/dpwes
Lake Barton Dredging, Restoration and Riser Modification Project
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Aaron George, PE
703-877-2809