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

10/13/2014 10 th Street Green Street 10 th Street Green Street 10 th Street Green Street and 10 th Street Green Street and Today’s Presentation Today’s Presentation Pathway Pathway • Presentation of 10 th Street City of Lake Oswego – Design Elements – Construction Issues APWA Presentation November 14, 2008 • Green Street Questions/ Discussion Points Rob Amsberry, City of Lake Oswego Tim Kraft, Otak • Site Visit – and it’s not raining… 10 th Street Green Street - 10 th Street Green Street - 10 th Street Green Street - Design 10 th Street Green Street - Design Background Background • City wanted a “Green Street” demonstration • Led by Lango-Hansen Landscape project Architects – did preliminary design • FAN neighborhood plan called for 10 th Street improvements • Otak was a subconsultant to L-H • 100 foot Right-of-Way • 5 Block “Green Street” project • Project included many civil, stormwater, and landscaping improvements • Reduce neighborhood flooding from a Curbless Street • Provides neighborhood pathway 10 th Street Green Street 10 th Street Green Street Design Elements 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 1

10/13/2014 10 th Street - Before 10 th Street - Before 10 th Street - After 10 th Street - After 10 th Street - Before 10 th Street - Before 10 th Street - After 10 th Street - After 10 th Street - Before 10 th Street - Before 10 th Street - After 10 th Street - After 2

10/13/2014 10 th Street Green Street 10 th Street Green Street 10 th Street Green Street 10 th Street Green Street Construction Issues Construction Issues Design Challenges 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 Planter Bottoms must be level 10 th Street Green Street 10 th Street Green Street 10 th Street Green Street 10 th Street Green Street Construction Issues Construction Issues Construction Issues Construction Issues Quality Control of Planter Mix Unmapped Utilities 10 th Street Green Street 10 th Street Green Street 10 th Street Green Street 10 th Street Green Street Planter Mix Discussion Planter Mix Discussion Stormwater Planters Stormwater Planters • 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 • Planter Media was 60% Compost and How are these requirements met? 40% Sand 3

10/13/2014 10 th Street Green Street 10 th Street Green Street 10 th Street Green street 10 th Street Green street Discussion Discussion • Minimum Infiltration Rate? – 1” Per Hour (DOE)? – 2” Per Hour (Portland)? The End • Frequency of Infiltration Testing? – One for every planter? Site Visit? – 50 Rain Gardens = 50 Tests? • When should these tests be conducted? • What about verification? 4