10 th Street Green Street and 10 th Street Green Street and Todays - - PDF document

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10th Street Green Street and Pathway 10th Street Green Street and Pathway

City of Lake Oswego APWA Presentation November 14, 2008

Rob Amsberry, City of Lake Oswego Tim Kraft, Otak

10th Street Green Street Today’s Presentation 10th Street Green Street Today’s Presentation

• Presentation of 10th Street

– Design Elements – Construction Issues

• Green Street Questions/ Discussion Points
• Site Visit – and it’s not raining…

10th Street Green Street - Background 10th Street Green Street - Background

• City wanted a “Green Street” demonstration

project

• FAN neighborhood plan called for 10th Street

improvements

• 100 foot Right-of-Way
• 5 Block “Green Street” project
• Reduce neighborhood flooding from a

Curbless Street

• Provides neighborhood pathway

10th Street Green Street - Design 10th Street Green Street - Design

• Led by Lango-Hansen Landscape

Architects – did preliminary design

• Otak was a subconsultant to L-H
• Project included many civil, stormwater,

and landscaping improvements

10th Street Green Street Design Elements 10th Street Green Street Design Elements

• 17 Stormwater Planters (2 rock-enclosed)
• 3 Vegetated Swales
• One Rock Water Feature
• 13 Porous Pavement Parking Areas
• Limited Street Improvements
• Neighborhood Pathway through the entire length
• Project was constructed August 2007 – January

2008

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10th Street - Before 10th Street - Before 10th Street - After 10th Street - After 10th Street - Before 10th Street - Before 10th Street - After 10th Street - After 10th Street - Before 10th Street - Before 10th Street - After 10th Street - After

10/13/2014 3 10th Street Green Street Design Challenges 10th Street Green Street Design Challenges

• Tight Soils – low infiltration rates
• Hilly streets
• Neighbors

– Door to door neighborhood outreach – Existing on-street parking – Character of the FAN

• Blending facilities into neighboring properties
• Street widths were reduced in some places

10th Street Green Street Construction Issues 10th Street Green Street Construction Issues

Planter Bottoms must be level

10th Street Green Street Construction Issues 10th Street Green Street Construction Issues

Quality Control of Planter Mix

10th Street Green Street Construction Issues 10th Street Green Street Construction Issues

Unmapped Utilities

10th Street Green Street Stormwater Planters 10th Street Green Street Stormwater Planters

• Planter Media was 60% Compost and

40% Sand

10th Street Green Street Planter Mix Discussion 10th Street Green Street Planter Mix Discussion

• WA Department of Ecology

– Minimum short-term hydraulic conductivity of 1.0 inch/hour per ASTM Designation D 2434 – Minimum organic content of approximately 10 percent by dry weight – pH between 5.5 and 7.0. – Carbon/Nitrogen Ratio between 20:1 and 35:1 – Cation Exchange Capacity of 5 meq/100 gms (Compost)

Portland has similar requirements How are these requirements met?

10/13/2014 4 10th Street Green Street Discussion 10th Street Green Street Discussion

• Minimum Infiltration Rate?

– 1” Per Hour (DOE)? – 2” Per Hour (Portland)?

• Frequency of Infiltration Testing?

– One for every planter? – 50 Rain Gardens = 50 Tests?

• When should these tests be conducted?
• What about verification?

10th Street Green street 10th Street Green street

The End Site Visit?