integration of design factors into post-construction ... · ecological restoration qa/qc 08.29.18...
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Integration of Design Factors into Post-Construction Ecological Restoration QA/QC
08.29.18Raymond D’Hollander, P.E., P.Eng. and Anne Burnham
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Agenda
• Restoration is a multi-decade process
• Communication
• Information handoffs
• Typical Challenges
• Vegetation as condition indicators
• Conclusions
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Ecological restoration vs. a lawn
• Complexity Numerous different plants and planting environments
• Evolution The initial planting is just the beginning Trees take decades to establish and create their own environment
• Maintenance and monitoring is not just mowing Easy to get off-track during site evolution
• Multi-disciplinary staff necessary Communication is critical Knowledge is lost with personnel and team changes
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Restoration is a multi-decade process
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“Cover crops” needed for decades to establish a forest
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Early ecological functions are important- may differ from long-term goal
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Handoffs are communication opportunities
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Key elements in handoffs
• Geometry Site designed to work when constructed Natural processes can change topography over time
• Soils Construction specifications are focused on initial gradation and properties USDA/wetland soil taxonomy requires in situ weathering over time
• Hydrology Design analyses are focused on flooding and erosion control Site evolution changes soil and vegetation retention of moisture
• Vegetation Initial establishment to prevent erosion Vegetation will evolve for years, decades, and centuries
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Available Design & Construction Information
• Remedial Design Report Goals and objectives Analyses Drawings Specifications Stormwater/Erosion Control
• Construction Completion Reports As-built geometries Design changes Material submittals Daily field reports with photos Regulatory acceptance
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Document filing & retention is under-appreciated
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Handoffs from design to post-construction
-2.0
-1.5
-1.0
-0.5
0.01/1 4/1 7/110/11/1 4/1 7/110/1
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Soil is important
Erosion, water retention, pH, etc.
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Hydrology is important
Is it working as expected?
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If you don’t know where you are.....
You probably won’t get there
• Vertical datum Site specific Local National Geodetic Survey: NGVD29 vs. NAVD88
NGS datum conversion program: https://www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html
• Horizontal coordinates Site specific Local State plane Latitude/Longitude Linear stationing (highways, railroads, rivers, pipelines)
• Units Metric, US, Imperial
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Surprises
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5 years of design and construction and nobody ever mentioned “carp”
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Design seed mixes to help identify actual site conditions
• Plants sensitive to: Water Soils Nutrients Light
• Include indicator plants to ID micro-variations: Hydrology Salinity pH Well-drained soil Poorly-drained soil
• Increases bio-diversity
• Identify trends in QA/QC data Define adaptive management opportunities
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Vegetation as indicator example
Year 1: Alisma subcordatumSalinity < 1 ppt
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Year 2: Typha latifolia1 ppt < Salinity < 7 ppt Utility work over winterLikely re-directed salt seep
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Concluding remarks
Site restoration includes long-term restoration Duration and multi-discipline requires communication focus
Design needs to set up post-construction monitoring and QA/QCDesign and construction documentation is valuable
Hand off to post-construction team
Vegetation is “free” site instrumentation Incorporate indicator species in design
Site variations and evolution require adaptive management
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