Low Impact Development (LID) Feasibility Study - City of Kirkland

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120th Ave. NE (CIP Project #: ST 0063 000)CIP Project DescriptionWiden 120th Ave. to a five-lane cross section between north of Totem Lake Mall at approximately NE 128th St. NE and NE 132nd St. Finalalignment includes two travel lanes in each direction and a two-way left-turn lane along with landscaped median islands, curb, gutter, sidewalkand bicycle lanes. Three signalized intersections will be reconstructed. Project length: ~1,650 ft.LID opportunities include use of bioswales.LID Opportunities and Benefits• North of the Juanita Creek culvert, bioretention swales and rain gardens can treat stormwater runoff from the roadway.• Additional vegetation and porous pavements will reduce impervious surfaces.• South of the Juanita Creek crossing, porous pavement sidewalks can provide flow attenuation prior to discharge into the conventionalsystem.Bioretention swales will provide flow attenuation and water quality treatment for the increased impervious roadway surface prior to directdischarge into Juanita Creek. South of Juanita Creek crossing, porous sidewalks can be used to decrease the amount of new impervioussurface that needs to be collected and treated in the conventional system. Demonstrating the importance of localized retention and treatmentprior to directly discharging into Juanita Creek is beneficial in this location where commercial transitions to a residential neighborhood withina highly used corridor.5’ Sidewalk4’-6”PlantingStrip12’ Southbound Lane 12’ Left-Turn Lane 12’ Northbound Lane 5’ Sidewalk120th Avenue NE looking north at NE 130th Lane - existing60’ ROWGeneral existing conditions & considerations• Stream piped underneath 120th Ave. NE & adjacent parking lots• ~4% slope between 128th St. & 130th Ln.; ~9% slope between 130th Ln. & NE 132nd St.• Evergreen Hospital emergency entrance at NE 130th Ln• Underground stormwater vault for hospital located on east side of 120th Ave. NE south of NE 130th Ln (~200’)Proposed concept• Stormwater planters on both east and west sides of 120th Ave. NE within area that drains directly to Juanita Creek (north of creek to 132nd)• Porous sidewalks on both east and west sides of 120th Ave. NE70’ ROW5’PorousSidewalkMin. 4’Stormwaterplanter5’ BikeLane10’ Lane 10’ Lane 10’ Turn Lane 10’ Lane 10’ Lane 5’ BikeLane70’+ ROWMin. 4’Stormwaterplanter5’PorousSidewalk120th Avenue NE looking north at NE 130th Lane - proposed28 City of Kirkland LID Feasibility Study for CIP Projects | SvR No. 07016 | December 21, 2007 c
! !! ! !! !NE 132nd St.1HourGlassPond120th Ave. NE (CIP Project #: ST 0063 000)Juanita Creek120th Ave. NENE 130th LnendLegendBicycle CirculationPedestrianCirculation2 Lanes of traffic each waywith center turning laneHospitalStormwaterVaultEvergreen Hospital/Medical CenterlinesE_TYPECULVRTVehicular TravelLanesRight-of-Way2! ! !DITCHLAKEPavement EdgesPIPEContour Lines (2’)PONDSTREAMStreamPipe!SWALEwetlandstax_parcelpavementedgeROWCulvertDitchWetlandStormwater Bioretention Planter swaleNE 128th St.bldg_pyRain gardencFeet0 100 200 300[Kirkland LID Feasibility Study120th Ave. NECity of Kirkland LID Feasibility Study for CIP Projects | SvR No. 07016 | December 21, 200729
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Page 37: LID Cost SummaryThe following estim

Low Impact Development (LID) Feasibility Study - City of Kirkland

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