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2010 07-16 orcca minicharrette

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This is a presentation designed to show examples of practices that are being suggested for the ORCCA land development project in Coos Bay, OR

This is a presentation designed to show examples of practices that are being suggested for the ORCCA land development project in Coos Bay, OR

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  • 0-10% Coverage: Streams are structurally sound with good biodiversity and habitat 11-25% Coverage: Streambanks become unstable, biodiversity is lost, & water quality is degraded >25% Coverage: Stream life is lost & water quality is poor
  • Soils support plant and animal biodiversity, sequester GH Soil temperature is important for seed germination, pest control, nitrogen uptake.
  • Non-Structural: Preventative Restorative Early planning Structural: Mitigative Engineered/Designed After the fact
  • Costs Vegetation Land area Benefits Biodiversity Water Quality Water Quantity We reduce the cost of: Pipes Detention basins Water quality facilities Catch basins Manholes Excavation Compaction
  • Costs Vegetation Land area Benefits Biodiversity Water Quality Water Quantity We reduce the cost of: Pipes Detention basins Water quality facilities Catch basins Manholes Excavation Compaction
  • Costs Vegetation Land area Benefits Biodiversity Water Quality Water Quantity We reduce the cost of: Pipes Detention basins Water quality facilities Catch basins Manholes Excavation Compaction
  • Asphalt Concrete Pavers Flexible Paving Systems Gravel Aggregate Turf Soft porous surfaces Decks & Boardwalks
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • Develop a plan that reuses resources in place Re-purpose previously disturbed areas Avoid sensitive areas. Reduce excavation. Limit compaction. Avoid building in areas that provide habitat for threatened and endangered species. Don't build in the floodplain, in wetlands, too close to waterways, or too close to coastal shorelines. Don't build on prime farmland or other significant soils. Build on gray or brownfields. Plan for transportation. To cross a stream with a utility, align it across a bridge or in casing above the stream instead of boring underneath the stream to bury it. Align utilities together in the same trench. Costs Working and designing around existing infrastructure Benefits Saves natural resources Reduce the cost of: Tipping fees Shipping Buying & installing new materials
  • Filter air pollution Sequester carbon dioxide to roduce oxygen Reduce the heat island effect Provide erosion control Filter pollutants in water Reduce stormwater runoff Cool streams Increase property values Reduce property selling time Costs Arborist report Extra design considerations Define haul road & stockpile locations Design infrastructure around driplines Tree fencing (orange mesh or rented chainlink) Pre-construction meeting to coordinate intent with subs Benefits Increase property values Reduce property selling time Reduce the cost of: Clearing Erosion control Tree mitigation fees Planting and establishing new trees Irrigation system for new trees Stormwater management
  • Develop a plan that reuses resources in place Re-purpose previously disturbed areas Avoid sensitive areas. Reduce excavation. Limit compaction. Avoid building in areas that provide habitat for threatened and endangered species. Don't build in the floodplain, in wetlands, too close to waterways, or too close to coastal shorelines. Don't build on prime farmland or other significant soils. Build on gray or brownfields. Plan for transportation. To cross a stream with a utility, align it across a bridge or in casing above the stream instead of boring underneath the stream to bury it. Align utilities together in the same trench. Costs Working and designing around existing infrastructure Benefits Saves natural resources Reduce the cost of: Tipping fees Shipping Buying & installing new materials
  • Develop a plan that reuses resources in place Re-purpose previously disturbed areas Avoid sensitive areas. Reduce excavation. Limit compaction. Avoid building in areas that provide habitat for threatened and endangered species. Don't build in the floodplain, in wetlands, too close to waterways, or too close to coastal shorelines. Don't build on prime farmland or other significant soils. Build on gray or brownfields. Plan for transportation. To cross a stream with a utility, align it across a bridge or in casing above the stream instead of boring underneath the stream to bury it. Align utilities together in the same trench. Costs Working and designing around existing infrastructure Benefits Saves natural resources Reduce the cost of: Tipping fees Shipping Buying & installing new materials
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • Develop a plan that reuses resources in place Re-purpose previously disturbed areas Avoid sensitive areas. Reduce excavation. Limit compaction. Avoid building in areas that provide habitat for threatened and endangered species. Don't build in the floodplain, in wetlands, too close to waterways, or too close to coastal shorelines. Don't build on prime farmland or other significant soils. Build on gray or brownfields. Plan for transportation. To cross a stream with a utility, align it across a bridge or in casing above the stream instead of boring underneath the stream to bury it. Align utilities together in the same trench. Costs Working and designing around existing infrastructure Benefits Saves natural resources Reduce the cost of: Tipping fees Shipping Buying & installing new materials
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • Compared to a pipe, daylighting Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an Costs Vegetation or other material to finish off swale look (not mulch – it floats!) Splash blocks Check dams Liners near footings (30 mil polyethylene or bentonite clay) Extra design and construction considerations Amenity Benefits Reduces the cost of: Excavation and compaction of pipe trench Pipe installation Eliminates the cost of base rock Slows, treats and cools the flow Contributes to biodiversity Fish habitat Animal passage Native plants Increases infiltration Can be an amenity
  • “ Sediment runoff rates from construction sites can be up to 20 times greater than agricultural sediment loss rates and 1000-2000 greater than those of forested lands .”
  • Costs Keep it clean or a clogged filter sack will flood the street Benefits Easier to maintain than biobags Much better protection against polluted waters leaving the site
  • Caine 2001 Snohomish County 2006 studies by WRG Costs Compost berm can be created with a bobcat or by blowing it in place Lack of familiarity Benefits No trenching, compaction, construction, or disposal Easier to maintain than sediment fences Much better protection against turbid waters leaving the site Compost can be spread over site when project is done instead of disposing of sediment fence
  • Orient long side of building on east-west axis Plant deciduous trees on the south sides of buildings Order trash and recycling pick up when bins are full instead of on a regular basis Plan to encourage walking Specify low-grow native seed mixes instead of high maintenance lawn
  • Orient long side of building on east-west axis Plant deciduous trees on the south sides of buildings Order trash and recycling pick up when bins are full instead of on a regular basis Plan to encourage walking Specify low-grow native seed mixes instead of high maintenance lawn
  • Transcript

    • 1. ORCCA Mini-charrette meeting Jul 16, 2010 Courtesy of Scott Edwards Architecture
    • 2. The Water Balance Model: typical for Cascadia Water Quantity Before 16.5” interflow (infiltration) 26” evapo- transpiration 0.2” runoff 65” rainfall yearly avg 22” groundwater (infiltration)
    • 3. The Water Balance Model Water Quantity After 0” baseflow (infiltration) reduced evapo- transpiration 63” runoff 65” rainfall yearly avg 2” evapo- transpiration Reduced infiltration
    • 4. Impervious Surfaces A Watershed Perspective
    • 5. The Water Balance Model Water Quality Before Some sediment
    • 6. The Water Balance Model Water Quality After Sediment (air particulates), dissolved pollutants (nitrogen, zinc), heavy metals, Feces, Temperature, other debris Sediment/turbidity, Hydrocarbons, Heavy metals, temp, feces, other chemicals Sediment/turbidity fertilizers, pesticides herbicides, feces, heavy metals
    • 7. Air
    • 8. Soil Image from Soil Quality Information Sheet , U.S. Department of Agriculture
    • 9. B est M anagement P ractice s (aka BMPs) Two Types N
    • 10. ORCCA’s Priority List – reorganized FILTRATION
      • Bioretention/rain gardens
      • Vegetated swales
      • Vegetated filter strips
      • Wetland preservation
    • 11. Structural BMPs Infiltration and Water Quality
      • Water quality benefits of infiltration techniques from the “National Pollutant Removal Performance Database for Stormwater Treatment Practices” Center for Watershed Protection, June 2000
      Pollutant Infiltration SW Wet-land Wet Pond Filtering WQ Swale Dry Pond Total Phosphorus 70 49 51 59 34 19 Soluble Phosphorus 85 35 66 3 38 -6 Total Nitrogen 51 30 33 38 84 25 Nitrate 82 67 43 -14 31 4 Copper N/A 40 57 49 51 26 Zinc 99 44 66 88 71 26 Total Suspended Solids 95 76 80 86 81 47
    • 12. ORCCA’s Priority List – reorganized RUNOFF REDUCTION
      • Infiltration
      • Trenches
      • Rain gardens & other vegetated treatment systems
      • Porous pavement
      • Disconnected downspouts
      • Evaporation
      • Eco-roof
      • Reuse
      • Cisterns for parking lot, street, sidewalk, and roof storage
      • Additional suggestions:
      • Limit disturbance
      • Save trees
    • 13. Infiltration trenches are a UIC not recommended for our timeline
    • 14. Rain Gardens
    • 15. Other vegetated systems: Planters
    • 16. Other vegetated systems: Vegetated Filter Strips
    • 17. Pervious pavements: Use with CAUTION here POROUS ASPHALT IN 1- 2” LIFT UNCOMPACTED SUBGRADE NON-WOVEN PROPYLENE GEOTEXTILE 12” 1-1/2” to 1” WASHED CRUSHED AGGREGATE 3”
    • 18. Downspout Disconnection
    • 19. Eco-roofs
    • 20. Cisterns for parking lot, street, sidewalk, and roof storage
    • 21. ORCCA’s Priority List – additional BMPs RUNOFF REDUCTION
      • Trellises and other vertical vegetation
      • Limit disturbance
        • In Planning
        • Save a tree in design
        • In construction
      • Minimize impervious surfaces
    • 22. Trellises & other vertical vegetation
    • 23. Trellises & other vertical vegetation
    • 24. Limit Disturbance in Planning
    • 25. Limit Disturbance in Design Save a Tree
    • 26. Limit Disturbance Construction Practices
    • 27. Limit Disturbance Construction Practices: Don’t cement treat the soil
    • 28. Minimize impervious surfaces
    • 29. ORCCA’s Priority List – reorganized STORAGE (aka Peak Flow Attenuation)
      • Caution: Storage for peak flow attenuation is not necessarily LID but will help us argue against the detention pipe.
      • Depressional storage in landscape islands and in tree, shrub, or turf depressions = runoff reduction through infiltration and treatment
      • Storage in wetland
      • Compost amendment and other soil restoration practices
    • 30. Storage in wetland at Oleson Woods Apts
    • 31. ORCCA’s Priority List: additional BMPs STORAGE (aka Peak Flow Attenuation)
      • Compost amendment and other soil restoration practices
    • 32. Compost Amendment & other soil restoration practices Photos on left are from Soils for Salmon website
    • 33. ORCCA’s Priority List – reorganized CONVEYANCE
      • Eliminate curbs & gutters
      • Swales
      • Roughening surfaces
      • Long overland flow paths over landscaped areas
      • Installing smaller culverts, pipes, & inlets
      • Creating terraces and check dams
    • 34. Eliminate curb & gutter
    • 35. Eliminate curb & gutter
    • 36. Swales & daylighting
    • 37. Swale & Daylighting Details
    • 38. Swale & Daylighting Details
    • 39. Check dams
    • 40. ORCCA’s Priority List: additional BMPs CONVEYANCE
      • Don’t impede subsurface flows.
      • Use treatment trains to extend the life of the vegetated facilities.
    • 41. Transportation BMPs Traffic calming woonerf Photo from Techniques for Urban Sustainability website
    • 42. Additional BMPs: Source Control
    • 43. Additional BMPs Source Control in Construction
    • 44. Additional BMPs Source Control in Construction Photo excerpted from “BMPs for Stormwater Discharges Associated with Construction Activities”, DEQ, Feb 2006
    • 45. Additional BMPs Source Control in Construction Photos and study and text excerpted from “BMPs for Stormwater Discharges Associated with Construction Activities”, DEQ, Feb 2006
    • 46. Additional BMPs Source Control Post Construction
    • 47. Biodiversity
    • 48. Siting Consideration N
    • 49. Additional BMPs discussed but no photos
      • More landscape practices
      • Water use
      • Source control
      • Materials
      • Operations & Maintenance
      • Social Goals
      • Passive Solar Design
      • Construction Management
    • 50. ORCCA Mini-charrette meeting Jul 16, 2010 Sustainability for all the places between the buildings.

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