Parking Forest Materials
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The Parking Forest is an assembly of materials to incorporate trees and stormwater management into parking lots without losing parking spaces. This presentation, part of a 4-hour training that included an overview of stormwater and water quality, tree needs, and pervious concreete, provides an overview of the assembly of materials including information on structural soils.
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Parking Forest Materials
- 1. The Parking Forest: Linear Tree Well Design Using Structural Soil 503.334.8634 www.greengirlpdx.com greengirl@greengirlpdx.com a certified women business enterprise Sustainability for all the places between the buildings
- 2. The Parking Forest An Assembly of Common Materials
- 3. The Parking Forest A Close Up
- 5. Structural Soil Our “Secret Weapon” Source: Cornell University – CU Structural Soil - http://www.hort.cornell.edu
- 6. How do we know it works? Olympia Results 8 Years Later Control Trees Planted in Compacted Native Soil Trees Planted in Structural Soil
- 15. Sunset Swim Center Parking Lot Construction Expenses Item Porous Concrete Cost $200,000 Drain Rock $62,000 Excavation $35,000 Mobilization $30,000 Curbs/Sidewalk $26,000 Landscaping $23,500 Soil/Structural Soil/Installation $18,000 Demolition/Removal $11,000 Striping/Wheel Stops/Signs $10,000 French Drain / Drain Pipe $3,000 12 Trees for Linear Well $1,600 Other Stuff $8,500 TOTAL CONSTRUCTION $427,600
- 16. Why these materials? • • • • • Structural soil Amended Native Soil Trees Wheel stops Crush rock (in landscape area)
- 17. Why these materials? Structural Soil • Structural soil versus structural supports
- 18. Why these materials? Proprietary mix versus mixed by contractor
- 19. Mixing Structural Soil Photo Source: www.greelysand.com/cu-soil.html
- 20. Olympia Soil Recipe 4 cubic yards Crushed Rock ¾”-1¼” + 1 cubic yard Loam/organic topsoil + 1 pound Soil Binder “Stabilizer” + 46 gallons water__________ Makes 4.6 cubic yards Structural Soil
- 21. Structural Soil Costs - Olympia “The price to supply, deliver and install the structural soil material per cubic yard ranged from $19 to $85 with an average bid of $42, the median price was $39.50. The city paid $24 per cubic yard for the structural soil material to the low bidder. This compare to a price quote we received for the supply of CU structural soil at $65 per cubic yard plus delivery. The source was over an hour’s drive away and delivery charges were $85 per hr with a truck and trailer hauling 22 cubic yard. The expected cost delivered was $72 per cubic yard.” Excerpted from “Structural Soil Demonstration Project” http://olympiawa.gov/~/media/Files/CPD/Urban%20Forestry/Forms/StructuralSoil.as hx Source: City of Olympia -Structural Soil Demonstration Project
- 22. Why these materials? Amended native soil Amended native soil versus faster draining “3-way” mix
- 23. Why these materials? Trees Trees versus only shrubs &/or groundcover: • Interception & evaporation • Evapotranspiration • Heat island effect
- 24. Why these materials? Wheel stops Wheel stops versus curbs
- 25. Why these materials? Crushed rock ¼”x 10 crushed rock versus rounded rock or pavers
- 26. Siting Criteria • Site is suitable for infiltration • Non-expansive soils • Soils should infiltrate at least 0.2 inches/hour*. Clay soils are OK! *Based on 2ft of structural soil, 25% void ratio, facility empty in 30 hours to be ready for the next Type IA storm
- 27. The Other Project PCC Sylvania Lot 10 • THPRD Sunset Swim Center = Redevelopment that manages rainfall • PCC Sylvania Lot 10 = Retrofit that manages runoff
- 28. The Parking Forest Retrofit at PCC Sylvania Lot 10 Ignore the piles of dirt. They’re gone.
- 29. Design Differences at PCC Sylvania Lot 10 Installed an impervious liner adjacent to impervious asphalt Stakeholders chose a native conifer Left most of the parking lot unmodified/ impervious
- 30. Water quality and quantity monitoring
- 31. Design Differences at PCC Sylvania Lot 10 Straight headin parking Just trees Donated “old school” solid bottom wheel stops = not ideal
- 32. Erosive forces are an issue at PCC
- 33. Non-attentive forces are an issue at PCC
- 34. Thank You!
- 35. Siting Criteria at PCC • Site is suitable for infiltration • Non-expansive soils • Soils should infiltrate at least 0.2 inches/hour*. Clay soils are OK! *Based on 2ft of structural soil, 25% void ratio, facility empty in 30 hours to be ready for the next Type IA storm