Williamsburg Boulevard Green Street Project - Projects & Planning
Williamsburg Boulevard Green Street Project
June 13,, 2012 Williamsburg Middle School
Relevant Outreach
November 12, 2008: Introduction to Little Pimmit Run Watershed Retrofits Workshop, Yorktown High School June 4, 2009: Little Pimmit Run Watershed Retrofit Study Results Workshop, Yorktown High School April 27, 2011: Williamsburg Median Green Street Project, Project Williamsburg Middle School June 13, 2012: Williamsburg Median Green Street Project Update, Update Williamsburg Middle School
What is a Green Street? A green street incorporates landscape features that reduce the impact of polluted runoff on our streams and the Chesapeake Bay.
Rain Gardens A landscaped depression with the ability to capture, temporarily retain, and filter surface runoff A rain garden is a storm water treatment facility. Fairlington Community Center
Al known Also k as: Bioretention,, Biofilter Bioretention Biofilter,, Bioretention Filter, Bioretention Basin
Green Street Rain Garden Runoff
Plants
Overflow str
Water Surface
Ground surface
6”- 12” ponding area 3” mulch 3
2’ - 3’ soil
underdrain 3”- 6” pea gravel 1-2’ coarse gravel
Most of Arlington County developed without stormwater management Storm drain to local stream
To the Potomac River
Water in storm drains does not go to a treatment plant…
On to the Chesapeake Bay
Effect of Urbanization Impervious surface f Runoff speed p and volume Water Quality Groundwater G d t supply Stream health Stream Corridor Restoration, FISRWG, 1998
Chesapeake Bay Required Pollution Reductions - 2025 Nitrogen Phosphorus S di Sediment t
7% 13% 18%
3,000 streetscape retrofit projects
Impervious Surfaces in Arlington
Roads Sidewalks
8%
Buildings Driveways
7% 5% 34%
16% 30% Impervious cover in Arlington = 41% or 6867 acres
Parking Lots Other
Stormwater Master Plan Update p
Storm Sewer Capacity Analysis County--wide stream inventory County Watershed retrofit plans to identify locations where stormwater treatment facilities can be added to help slow down and filter stormwater runoff. Each plan contains an inventory of projects projects. Rain gardens g pavement/impervious surface Removing Little Pimmit Run Watershed Retrofit Plan htt // http://www.arlingtonva.us/departments/Environment li t /d t t /E i t alServices/Sustainability/page75627.aspx
Retrofit Ranking Criteria
Project Components Two
rain gardens (1 in each median section) between 33rd and 34th Rds N New median curb curb, improved intersections and repaving New N canopy ttrees between b t Old D Dominion i i Dr. and 33rd Rd N and between 35th St and 34th Rd N N.
New Project Elements Addition
of forebays (34th Rd to 34th St rain
garden) Planting plan for rain gardens Coordination with 36” water main project Coordination with Old Dominion Drive Pedestrian Improvement Project
Williamsburg g Green Street
a) 4 sections
b) 3 sections ti
Williamsburg Green Street 36” Water Main
a) 4 sections
b) 3 sections
Rain Garden Drainage Areas Total
drainage g area: 1.8 acres Impervious area treated: 1.1 acres Water treated: 4458 ft3 (33,345 33 345 gallons) A
B
Concrete weir
Curb cut
Pipe
5-8” River Rock
Concrete weir
3-5” River Rock
Forebays y
Receive stormwater Slow runoff Prevent erosion M k rain Make i garden d easier i to maintain Decrease rain garden g depth
Williamsburg Bioretention Typical CrossCross-Section 13’ 6”
plants 6” curb
3” mulch 3’ soil 3” pea gravel 1’ gravel
1 – 2 1’ 2’ Max 2 ¼ ’ underdrain
Trees and Plants 14
trees and 2 shrubs will be removed; 2 transplanted Includes 3 mature trees (> 10 dbh dbh)) – all exhibiting signs of stress 7 canopy trees; 7 small trees and ±16 shrubs will be planted Numerous N flflowering i perennials i l and d grasses All plants will be native, salt tolerant
Rain Garden Planting Plan
Allegheny serviceberry
Obedient plant
Purple Coneflower
Smooth blue aster
Sea Oats
Winterberry
Beardtongue
Maintenance Initially, Initially
after any large storms Thereafter, quarterly Remove R sediment di t Weed, inspect, replant, prune plants Remove trash Make sure underdrain underdrain,, overflow, overflow all pipes and catch basins working correctly
Construction Schedule Construction
– Spring p g 2013 Coordinated with 36” water main project Water main constructed in 2 phases with intersection at 35th St N – Fall 2013 Paving P i b between t Gl Glebe b and d 33rd Rd N – Spring 2014 Construction of median between Old Dominion and 33rd Rd N – constructed as part of Old Dominion project.
JUNE 2011
SEPT 2011
MAR 2012
Q Questions??
Contact info: info: Christin Jolicoeur Phone: ((703)) 228228-3588 Email: [email protected] Green Streets www.arlingtonva.us/departments/EnvironmentalServi ces/Sustainability/page81126.aspx
Little Pimmit Run Watershed Retrofit Plan www.arlingtonva.us/departments/EnvironmentalServi g p ces/Sustainability/page75627.aspx
36” Water Main Alignment
PHASE III
PHASE II
June 13,, 2012 Williamsburg Middle School
Relevant Outreach
November 12, 2008: Introduction to Little Pimmit Run Watershed Retrofits Workshop, Yorktown High School June 4, 2009: Little Pimmit Run Watershed Retrofit Study Results Workshop, Yorktown High School April 27, 2011: Williamsburg Median Green Street Project, Project Williamsburg Middle School June 13, 2012: Williamsburg Median Green Street Project Update, Update Williamsburg Middle School
What is a Green Street? A green street incorporates landscape features that reduce the impact of polluted runoff on our streams and the Chesapeake Bay.
Rain Gardens A landscaped depression with the ability to capture, temporarily retain, and filter surface runoff A rain garden is a storm water treatment facility. Fairlington Community Center
Al known Also k as: Bioretention,, Biofilter Bioretention Biofilter,, Bioretention Filter, Bioretention Basin
Green Street Rain Garden Runoff
Plants
Overflow str
Water Surface
Ground surface
6”- 12” ponding area 3” mulch 3
2’ - 3’ soil
underdrain 3”- 6” pea gravel 1-2’ coarse gravel
Most of Arlington County developed without stormwater management Storm drain to local stream
To the Potomac River
Water in storm drains does not go to a treatment plant…
On to the Chesapeake Bay
Effect of Urbanization Impervious surface f Runoff speed p and volume Water Quality Groundwater G d t supply Stream health Stream Corridor Restoration, FISRWG, 1998
Chesapeake Bay Required Pollution Reductions - 2025 Nitrogen Phosphorus S di Sediment t
7% 13% 18%
3,000 streetscape retrofit projects
Impervious Surfaces in Arlington
Roads Sidewalks
8%
Buildings Driveways
7% 5% 34%
16% 30% Impervious cover in Arlington = 41% or 6867 acres
Parking Lots Other
Stormwater Master Plan Update p
Storm Sewer Capacity Analysis County--wide stream inventory County Watershed retrofit plans to identify locations where stormwater treatment facilities can be added to help slow down and filter stormwater runoff. Each plan contains an inventory of projects projects. Rain gardens g pavement/impervious surface Removing Little Pimmit Run Watershed Retrofit Plan htt // http://www.arlingtonva.us/departments/Environment li t /d t t /E i t alServices/Sustainability/page75627.aspx
Retrofit Ranking Criteria
Project Components Two
rain gardens (1 in each median section) between 33rd and 34th Rds N New median curb curb, improved intersections and repaving New N canopy ttrees between b t Old D Dominion i i Dr. and 33rd Rd N and between 35th St and 34th Rd N N.
New Project Elements Addition
of forebays (34th Rd to 34th St rain
garden) Planting plan for rain gardens Coordination with 36” water main project Coordination with Old Dominion Drive Pedestrian Improvement Project
Williamsburg g Green Street
a) 4 sections
b) 3 sections ti
Williamsburg Green Street 36” Water Main
a) 4 sections
b) 3 sections
Rain Garden Drainage Areas Total
drainage g area: 1.8 acres Impervious area treated: 1.1 acres Water treated: 4458 ft3 (33,345 33 345 gallons) A
B
Concrete weir
Curb cut
Pipe
5-8” River Rock
Concrete weir
3-5” River Rock
Forebays y
Receive stormwater Slow runoff Prevent erosion M k rain Make i garden d easier i to maintain Decrease rain garden g depth
Williamsburg Bioretention Typical CrossCross-Section 13’ 6”
plants 6” curb
3” mulch 3’ soil 3” pea gravel 1’ gravel
1 – 2 1’ 2’ Max 2 ¼ ’ underdrain
Trees and Plants 14
trees and 2 shrubs will be removed; 2 transplanted Includes 3 mature trees (> 10 dbh dbh)) – all exhibiting signs of stress 7 canopy trees; 7 small trees and ±16 shrubs will be planted Numerous N flflowering i perennials i l and d grasses All plants will be native, salt tolerant
Rain Garden Planting Plan
Allegheny serviceberry
Obedient plant
Purple Coneflower
Smooth blue aster
Sea Oats
Winterberry
Beardtongue
Maintenance Initially, Initially
after any large storms Thereafter, quarterly Remove R sediment di t Weed, inspect, replant, prune plants Remove trash Make sure underdrain underdrain,, overflow, overflow all pipes and catch basins working correctly
Construction Schedule Construction
– Spring p g 2013 Coordinated with 36” water main project Water main constructed in 2 phases with intersection at 35th St N – Fall 2013 Paving P i b between t Gl Glebe b and d 33rd Rd N – Spring 2014 Construction of median between Old Dominion and 33rd Rd N – constructed as part of Old Dominion project.
JUNE 2011
SEPT 2011
MAR 2012
Q Questions??
Contact info: info: Christin Jolicoeur Phone: ((703)) 228228-3588 Email: [email protected] Green Streets www.arlingtonva.us/departments/EnvironmentalServi ces/Sustainability/page81126.aspx
Little Pimmit Run Watershed Retrofit Plan www.arlingtonva.us/departments/EnvironmentalServi g p ces/Sustainability/page75627.aspx
36” Water Main Alignment
PHASE III
PHASE II
