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DCR Grant Project Update
homepage > government > board of supervisors > providence district > dcr grant project update

 

Demonstrating Innovation:
A Stormwater Retrofit at the Providence Supervisor's Office

Presented at the Board of Supervisor's November 21, 2005 meeting

Demonstrating Innovation team members being recognized at the BOS presentation - photo by OPA

Members of the Demonstrating Innovation team being recognized at the
Board of Supervisor's Presentation on November 21, 2005

Demonstrating Innovation Presentation
(large pdf file 2 MB)

Demonstrating Innovation Brochure
(pdf file 476 KB)

Demonstrating Innovation: A Stormwater Retrofit is the recipient of the 2005 NACo Achievement Award

Ground Breaking Ceremony for the Retention Rain Garden
June 21, 2005

Project Update
Retention Rain Garden and Permeable Pavers

slideshow view of the project construction site - photos by Joan Maguire and Tania Hossain
Slideshow view of the project construction site.

Project Updates

Focus on Green Roof - Focus on Retention Rain Garden - Focus on Permeable Pavers

Focus on Permeable Pavers

The Permeable Pavers project is now completed. The project site is denoted by "D" on the
Project/Scope Map.


Step 1. The project area was marked by Miss Utility to indicate utility areas around the project site.
Step 2. The area was excavated to prep for both the retention rain garden and the permeable pavers projects within three days. Work was then halted for a few days due to two rain storms that accumulated water in the project site that became fondly refered to as 'the hole.' After the first storm, water was able to drain but after the second storm, water had to be 'pumped out' and allowed to 'dry out' before work was resumed expediently.
Step 3. The area was then graded and had to be regraded due to sediment deposit from the rain storms.
Step 4. Utility (light) poles were removed.
Step 5. Filter fabric was installed to prevent soil and small particles from cloging water passage.
Step 6. Three feet of #3 stones were added as the next layer.
Step 7. 28 Stormtech chambers were installed on top of the stone layer. Each Stormtech chamer holds 45 cubic feet of water - total project area will be able to retain 1260 cubic feet of water.
Step 8. Another layer of #3 stones were added to the area.
Step 9. Concrete was then poured to create a curb that separated the retention rain garden from the permeable pavers parking area.
Step 10. The crew members then methodically and diligently placed each pavers one at a time as the last layer of the permeable pavers project.


Focus on Retention Rain Garden

The Retention Rain Garden project is now completed. The project site is denoted with "G" on the Project/Scope Map.


The following work has been completed towards the retention rain garden project:

Steps 1 - 9: See above.

Focus on Green Roof
The green roof project is now completed. The project site is denoted with "E" on the Project/Scope Map.

The following work has been completed towards the completion of the green roof project:
Step 1. The concrete area of the roof top was primed using a hot applied rubberized membrane known as MM6125 as manufactured by American Hydrotch.
Step 2. One ply of modified bitumen base was installed flushed around the roof perimeter and down four spouts were installed.
Step 3. One layer of white cotton fabric and Hydroflex WSF 30 was next placed to protect the newly installed membrane.
Step 4. One layer of Hydroflex WSF 40 root barrier was loosely laid.
Step 5. One layer of 1.5" 40 psi extruded polystyrene insulation was installed.
Step 6. One layer of GR 15 drainage/water retention mat was installed.
Step 7. One layer of filter fabric was installed.
Step 8. 4" of soil material was next placed on top of the filter fabric.
Step 9. Placements of rock around the perimeter of the roof was to prevent the down-spouts from being clogged.
Step 10. Lastly, seedum plants were planted for the completion of the green roof.

Rubber treatment - photo by Tania Hossain

Step 1: The concrete area of the roof top was primed using a hot applied rubberized membrane known as MM6125 as manufactured by American Hydrotch.

Base and spouts - photo by Russ Smith

Step 2: One ply of modified bitumen base was installed flushed around the roof perimeter and four down spouts were installed.

Cotton fabric - photo by Russ Smith

Step 3: One layer of white cotton fabric placed to protect the newly installed membrane.

Hydroflex WSF 30 - photo by Russ Smith

Step 3: One layer of Hydroflex WSF 30 being placed on top of cotton fabric.

Root barrier and insulation - photo by Tania Hossain

Steps 4 & 5: One layer of Hydroflex WSF 40 root barrier was loosely laid.
One layer of 1.5" 40 psi extruded polystyrene insulation was installed.


Retention mat - photo by Russ Smith

Step 6. One layer of GR 15 drainage/water retention mat was installed.

Filter Fabric - photo by Tania Hossain

Step 7. One layer of filter fabric was installed.

Soil material - photo by Tania Hossain

Step 8. 4" of soil material was next placed on top of the filter fabric.

Placement of rocks - photo by Tania Hossain

Step 9. Placements of rock around the perimeter of the roof was to prevent the down-spouts from being clogged.

Completed green roof - photo by Tania Hossain

Step 10. Lastly, seedum plants were planted for the completion of the green roof.


More pictures of project construction

Passage construction  - photo by Tania Hossain

Installing one of four passages for water flow from roof top.

Sealing - photo by Tania Hossain

Rubber sealing around the water passage.

Bitumen flushing and down spout around roof perimeter - photo by Tania Hossain

One ply of modified bitumen base was installed flushed around the roof perimeter -
controlling for water flow.

Sealing the roof perimeter - photo by Tania Hossain

Sealing the perimeter of the roof using Hydroflex WSF 30.


Pictures of materials used in project construction

Seedum plants - photo by Tania Hossain

Seedum plants.


Seedum plants - photo by Tania Hossain

Seedum plants.

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Demonstrating Innovation:
A Stormwater
Retrofit at the Providence Supervisor's Office

General Project Description


This LID demonstration project is located within the Accotink Creek watershed and has a drainage area of .83 acre. In addition to the Providence Supervisor's Office, the site is also the location of the County's Merrifield Fire Station #30. The overall complex encompasses a land area of 1.8 acres with approximately 1.44 acres being impervious. The proposed work will serve as a highly visible demonstration project featuring three LID practices: a bioretention basin (rain garden), a green roof, and permeable pavers. The bioretention basin and permeable pavers with infiltration trench will allow runoff to drain into an underlying retention area where it can then slowly infiltrate into the surrounding soil. The green roof installation on an existing concrete storage structure will serve to reduce rooftop stormwater runoff and provide a comparison to an adjacent storage structure with an impervious roof. The bioretention basin will occupy an area of 680 ft2 and the permeable paver area is 1,550 ft2 in size, with a combined volume of approximately 9,841 ft3 in the underlying infiltration trench. The disturbed area will be 2300 ft2 in size. The green roof will occupy an area of approximately 240 ft2. These three integrated LID practices will work in harmony to address both water quality and water quantity retrofit goals on the site. They are expected to retain and infiltrate a significant amount of the stormwater currently running off the impervious surface.


Chesapeake Bay Program


Read our proposal
pdf file (large)

Conceptual Drawing of Rain Garden/Permeable Pavers area.

A conceptual diagram of the new rain garden and permeable pavers area at Fire Station 30 - part of the recently-awarded DCR Grant to the Supervisor.


Related: Environmental Excellence for Fairfax County
A 20-Year Vision

Related: Low Impact Development: Controlling Runoff at its Source

Related: DPWES LID document (pdf file)


Project Scope/Map:

Project Scope and Map



The grant received funding from the Environmental Protection Agency's Chesapeake Bay Program at the Virginia Department of Conservation and Recreation.

 


   



Last Modified: Tuesday, August 30, 2011


 
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