Williamsburg Boulevard Williamsburg Boulevard Green Street ProjectGreen Street Project

June 13, 2012June 13, 2012,,Williamsburg Middle SchoolWilliamsburg Middle School

Relevant OutreachRelevant OutreachRelevant OutreachRelevant Outreach November 12, 2008: November 12, 2008: Introduction to Little Introduction to Little

PimmitPimmit Run Watershed Retrofits Workshop, Run Watershed Retrofits Workshop, Yorktown High SchoolYorktown High School

June 4, 2009: June 4, 2009: Little Little PimmitPimmit Run Watershed Run Watershed Retrofit Study Results Workshop, Yorktown High Retrofit Study Results Workshop, Yorktown High SchoolSchoolSchoolSchool

April 27, 2011: April 27, 2011: Williamsburg Median Green Williamsburg Median Green Street Project Williamsburg Middle SchoolStreet Project Williamsburg Middle SchoolStreet Project, Williamsburg Middle SchoolStreet Project, Williamsburg Middle School

June 13, 2012: June 13, 2012: Williamsburg Median Green Williamsburg Median Green Street Project Update Williamsburg MiddleStreet Project Update Williamsburg MiddleStreet Project Update, Williamsburg Middle Street Project Update, Williamsburg Middle SchoolSchool

What is a Green Street?What is a Green Street?A green street incorporates landscape features A green street incorporates landscape features that reduce the impact of polluted runoff on ourthat reduce the impact of polluted runoff on ourthat reduce the impact of polluted runoff on our that reduce the impact of polluted runoff on our streams and the Chesapeake Bay. streams and the Chesapeake Bay.

Rain GardensRain Gardens

A landscapedA landscapedA landscaped A landscaped depression depression with the with the ability to capture, ability to capture,

temporarily retain, temporarily retain, and filter surface and filter surface

runoffrunoffrunoffrunoff

A A rain garden is a storm rain garden is a storm water treatment facility.water treatment facility.

Al kAl k

Fairlington Community Center

Also known as:Also known as:BioretentionBioretention, , BiofilterBiofilter, , BioretentionBioretention Filter, Filter, BioretentionBioretention BasinBasin

Green Street Green Street Rain GardenRain GardenRunoff

Ground surfaceOverflow str Water SurfacePlantsPlants

6”- 12” ponding area

3” mulch

2’ - 3’ soil

3 mulch

underdrain

1-2’ coarse gravel

3”- 6” pea gravel

Most of Arlington County developed Most of Arlington County developed withoutwithout stormwaterstormwater managementmanagement

Storm drain

without without stormwaterstormwater managementmanagement

Storm drain to local stream

To theTo the Potomac

River

On to the Chesapeake Bay

Water in storm drains does not go to a treatment plant…

Effect of Urbanization Effect of Urbanization

Impervious fsurface

Runoff speed pand volume

Water Quality

G d tGroundwater supply

Stream healthStream Corridor Restoration, FISRWG, 1998

Chesapeake Bay

Required Pollution Reductions - 2025

Nitrogen 7%Phosphorus 13%S di t 18%Sediment 18%

3,000 streetscape retrofit projectsprojects

Impervious Surfaces in ArlingtonImpervious Surfaces in Arlington

Roads Buildings Parking LotsSidewalks Driveways Other

34%8%

7% 5%

34%16%

30%

Impervious coverImpervious coverin Arlington =

41% or 6867 acres

StormwaterStormwater Master Plan UpdateMaster Plan Updatepp Storm Sewer Capacity Storm Sewer Capacity AnalysisAnalysis CountyCounty--wide wide stream stream inventoryinventory

Watershed retrofit plansWatershed retrofit plans to identify locations where to identify locations where stormwaterstormwater treatment facilities can be added to help treatment facilities can be added to help slow down and filter slow down and filter stormwaterstormwater runoff.runoff. Each plan Each plan contains an inventory of projectscontains an inventory of projectscontains an inventory of projects.contains an inventory of projects. Rain gardensRain gardens Removing pavement/impervious surfaceRemoving pavement/impervious surfacegg

Little Little PimmitPimmit Run Watershed Retrofit PlanRun Watershed Retrofit Planhtt // li t /d t t /E i thtt // li t /d t t /E i thttp://www.arlingtonva.us/departments/Environmenthttp://www.arlingtonva.us/departments/Environment

alServices/Sustainability/page75627.aspxalServices/Sustainability/page75627.aspx

Retrofit Ranking CriteriaRetrofit Ranking Criteria

Project ComponentsProject ComponentsProject ComponentsProject Components

Two rain gardens (1 in each medianTwo rain gardens (1 in each median Two rain gardens (1 in each median Two rain gardens (1 in each median section) between 33section) between 33rdrd and 34and 34thth RdsRds NN

New median curb improved intersectionsNew median curb improved intersectionsNew median curb, improved intersections New median curb, improved intersections and repavingand repavingN t b t Old D i iN t b t Old D i iNew canopy trees between Old Dominion New canopy trees between Old Dominion Dr. and 33Dr. and 33rdrd Rd N and between 35Rd N and between 35thth St and St and 3434thth Rd NRd N3434thth Rd N.Rd N.

New Project ElementsNew Project ElementsNew Project ElementsNew Project Elements

Addition ofAddition of forebaysforebays (34(34thth Rd to 34Rd to 34thth St rainSt rain Addition of Addition of forebaysforebays (34(34 Rd to 34Rd to 34 St rain St rain garden)garden)

Planting plan for rain gardensPlanting plan for rain gardens Planting plan for rain gardensPlanting plan for rain gardensCoordination with 36” water main projectCoordination with 36” water main projectCoordination with Old Dominion Drive Coordination with Old Dominion Drive

Pedestrian Improvement ProjectPedestrian Improvement Project

Williamsburg Green StreetWilliamsburg Green Streetgg

a) 4 sections

b) 3 tib) 3 sections

Williamsburg Green StreetWilliamsburg Green Street

36” Water Main

a) 4 sections

b) 3 sectionsb) 3 sections

Rain Garden Drainage AreasRain Garden Drainage AreasRain Garden Drainage AreasRain Garden Drainage Areas Total drainage area: 1.8 acresTotal drainage area: 1.8 acresgg Impervious area treated: 1.1 acresImpervious area treated: 1.1 acresWater treated:Water treated: 44584458 ftft33 ((33 34533 345 gallons)gallons)Water treated: Water treated: 4458 4458 ftft33 ((33,345 33,345 gallons) gallons)

A BA B

5-8” River Rock

Curb cutConcrete weir

Pipe

Concrete weir

3-5” River Rock

ForebaysForebays

yy Receive Receive stormwaterstormwater

Slow runoffSlow runoff Prevent erosionPrevent erosion M k i d iM k i d i Make rain garden easier Make rain garden easier

to maintainto maintain Decrease rain garden Decrease rain garden gg

depthdepth

Williamsburg Williamsburg BioretentionBioretentionTypical CrossTypical Cross--SectionSection

plants6” curb

13’ 6”

3” mulch3’ soil1’ 2’3” pea gravel1’ gravel

1 – 2Max 2 ¼ ’

underdrainunderdrain

Trees and PlantsTrees and PlantsTrees and PlantsTrees and Plants 14 trees and 2 shrubs will be removed; 214 trees and 2 shrubs will be removed; 2 14 trees and 2 shrubs will be removed; 2 14 trees and 2 shrubs will be removed; 2

transplantedtransplanted Includes 3 mature trees (> 10Includes 3 mature trees (> 10 dbhdbh)) –– allall Includes 3 mature trees (> 10 Includes 3 mature trees (> 10 dbhdbh) ) –– all all

exhibiting signs of stressexhibiting signs of stress 7 canopy trees; 7 small trees and7 canopy trees; 7 small trees and ±±1616 7 canopy trees; 7 small trees and 7 canopy trees; 7 small trees and ±±16 16

shrubs will be plantedshrubs will be plantedN fl i i l dN fl i i l dNumerous flowering perennials and Numerous flowering perennials and grassesgrasses

All plants will be native, salt tolerantAll plants will be native, salt tolerant

Rain Garden Planting PlanRain Garden Planting PlanRain Garden Planting PlanRain Garden Planting Plan

Allegheny serviceberrySea Oats

Purple Coneflower

Winterberry BeardtongueSmooth blue aster

Obedient plant

MaintenanceMaintenanceMaintenanceMaintenance

Initially after any large stormsInitially after any large storms Initially, after any large stormsInitially, after any large storms Thereafter, quarterlyThereafter, quarterly

R di tR di tRemove sedimentRemove sedimentWeed, inspect, replant, prune plantsWeed, inspect, replant, prune plantsRemove trashRemove trashMake sureMake sure underdrainunderdrain overflow all pipesoverflow all pipesMake sure Make sure underdrainunderdrain, overflow, all pipes , overflow, all pipes

and catch basins working correctlyand catch basins working correctly

Construction ScheduleConstruction ScheduleConstruction Schedule Construction Schedule Construction Construction –– Spring 2013 Spring 2013 p gp gCoordinated with 36” water main projectCoordinated with 36” water main projectWater main constructed in 2 phases withWater main constructed in 2 phases withWater main constructed in 2 phases with Water main constructed in 2 phases with

intersection at 35intersection at 35thth St N St N –– Fall 2013Fall 2013 P i b t Gl b d 33P i b t Gl b d 33rdrd Rd NRd N Paving between Glebe and 33Paving between Glebe and 33rdrd Rd N Rd N ––

Spring 2014Spring 2014Construction of median between Old Construction of median between Old

Dominion and 33Dominion and 33rdrd Rd N Rd N –– constructed as constructed as part of Old Dominion project.part of Old Dominion project.

JUNE 2011

SEPT 2011 MAR 2012

Questions??Questions??QQ Contact infoContact info::

Christin JolicoeurChristin Jolicoeur Phone: (703) 228Phone: (703) 228--35883588( )( ) Email: Email: cjolicoeur@arlingtonva.uscjolicoeur@arlingtonva.usGreen Streets Green Streets www.arlingtonva.us/departments/EnvironmentalServiwww.arlingtonva.us/departments/EnvironmentalServi

ces/Sustainability/page81126.aspxces/Sustainability/page81126.aspx

Little Little PimmitPimmit Run Watershed Retrofit PlanRun Watershed Retrofit Planwww.arlingtonva.us/departments/EnvironmentalServiwww.arlingtonva.us/departments/EnvironmentalServig pg p

ces/Sustainability/page75627.aspxces/Sustainability/page75627.aspx

36” Water Main Alignment36” Water Main Alignment

PHASE III

PHASE II