Colony Park and Woodlynne Project Information

1. Colony Park
Woodlynne
(PC9131)
Facility Maintenance and Retrofit

2. Tonight’s Meeting Agenda
• What is the Stormwater Planning Division?
• Environmental Services
• Watershed Planning
• Stormwater Project Goals and Objectives
• Project Information, Examples
• Next Steps – Questions and Answers

3. Department of Public Works and
Environmental Services
(DPWES)
Land
Capital
Development Solid Waste Stormwater Wastewater
Facilities
Services
Maintenance
Stormwater
& Stormwater
Planning
Management
Division
Division

4. Environmental Services
Watershed Projects Implementation Branch
(WPIB)
• House Flood Mitigation
• Stream Restoration
• Outfall Restoration
• Site Retrofits
• Detention Basin Retrofits
• Regional Basin Retrofits

5. Service Drivers
• Federal
– Clean Water Act of 1987
• Municipal Separate Storm Sewer (MS4) Permit
– Total Maximum Daily Loads (TMDL)
• Commonwealth
– Virginia Stormwater Management Act
– Chesapeake Bay Preservation Act

6. Countywide
Watershed
Planning

7. Reasons for Countywide Watershed
Planning
To restore and protect streams in the county, of which 80 percent are
categorized as being in “fair” to “very poor” condition
To help meet state and federal water quality standards by identifying
strategies to prevent and remove pollution
To support Virginia’s commitment toward cleaning up the Chesapeake Bay
To update the watershed management plans and incorporate the use of new
technologies
To take a comprehensive approach in addressing multiple regulations,
commitments and community needs

8. Pohick Creek Watershed
Watersheds/Drainage Areas
• Drains directly to the Potomac
River through Gunston Cove
• 36.5 square miles
• 180 miles of streams
For more details:
http://www.fairfaxcounty.gov/dpwes/wa
tersheds/pohickcreek_docs.htm

9. Stormwater Projects
Social Goals and Objectives
1. Communicate with neighborhood members
2. Inform neighborhood members of project objectives and
goals
3. Continue to coordinate and share information with the
community

10. Detention Basin Retrofit
Ecological Goals and Objectives
Retrofit - Improve Water Quality
– Extend flow path with retrofit features
• Remove concrete trickle ditch, create extended flow path
• Forebays
• Micropools
– Future maintenance
• Sediment removal
– Reduce downstream impacts

11. Current Site Condition

24. Project Information

27. Showy Meadow Mix
Scientific Name Common Name Percent of Mix
Showy Meadow Mix
Andropogon virginicus Broomsedge 6
Asclepias tuberosa Butterfly Weed 8
Chamaecrisista fasciculata Partridge Pea 5
Coreopsis lanceolata Lance-Leaf Coreopsis 6
Heliopsis helianthoides Oxeye Sunflower 1
Liastris spicata Marsh Blazing Star 8
Lupinus perennis Wild Blue Lupine 4
Penstemon digitalis Tall White Beard Tongue 4
Rudbeckia hirta Black Eyed Susan 5
Schizachyrium scoparium Little Bluestem 34
Solidago juncea Early Goldenrod 1
Sorghastrum nutans, Tomahawk Indian Grass 10
Tridens flavus Purple-top Tridens 5
Zizia aurea Golden Alexanders 3
Total: 100%
Cover Crop
Lolium multiflorum Annual rye Total: 100%
Apply 3-inch blanket of specified compost prior to or during seed application.
First till existing soil to a depth of 8-inches to loosen soil and kill turf. Compost shall
be Soilmate Compost available from Loudoun Composting44150 Wade Drive,
Chantilly, VA 20152, Phone: 703-327-8428, FAX: 703-327-0649 or an approved
equal. The paper work, samples and STA certifications for all alternates shall be
submitted and approved prior to purchase. Alternates must be STA approved by the
U.S. Composting Council's Seal of Testing Assurance Program.
Broadcast, pump or hand seed at ¾lb/1000 ft2 and annual rye (Lolium multiflorum) at
1lb/1000 ft2 on top of applied 3-inch blanket of specified compost. Immediately cover
with light straw mulch for stabilization and moisture retention. Eliminate straw if the
seed is integrated into the compost and pumped on. Substitute winter wheat for annual
rye if seeding after October 1. Reseed and mulch all areas with less than 80%
germination.
Custom pure live seed (PLS) ERNST mix or approved equivalent. Seed can be
purchased through ERNST Conservation Seeds at 9006 Mercer Pike, Meadville,
Pennsylvania 16335;(800) 873-3321 (Toll Free); (814) 336-2404 (Phone); (814) 336-
5191 (Fax). The paper work, samples and certifications for all alternates shall be
submitted and approved prior to purchase.

30. Design Plan for Government Center
Detention Basin Retrofit

31. Before Construction

32. During Construction

33. Immediately After

34. Soon After

35. 3 years after

36. Stream restoration before

37. Stream Restoration after

38. Next Steps…
Feasibility study (to be completed March, 2013)
Stakeholder meeting
Assessment of the watershed
Development of Conceptual Designs
Survey
Request of necessary easements (by mid of April, 2013)
Stormwater and maintenance access
Preliminary Design (May, 2013)
Develop the conceptual design into a plan set
Final Design (June, 2013)
Preliminary design is developed into a construction ready plan set.
Construction (September 2013)
Public bid process
Construction notification
Construction

39. Post Construction Activity
Plantings
– Within 30 days of construction completion
Maintenance
– Annual inspection and mowing (if required)
– Monitoring performed to ensure proper function and
identify need for future maintenance

40. Fred Oaks project
EXISTING CONDITIONS PRIOR TO
CONSTRUCTION

41. CLEARING and GRADING

42. INSTALLING GROUND CONTROL

43. VIEW OF FINAL PROJECT
REFORESTATION OF SLOPES TO FOLLOW IN THE FALL

44. Sequoia Pond retrofit
Before Construction

46. Construction:Construction: Rock Structure Placementof Channels
Pond Excavation and Formation

47. Construction: Installation of Concrete Riser Structure

48. Construction: Pond Stabilization

49. Completion: View of Outfall Channels and Low Flow Drainage Way

50. Completion: Access Road Utilizing Grass-Pavers

51. Completed Pond Retrofit

53. Cinnamon Oaks

56. Resources
Stormwater Planning Division Website
http://www.fairfaxcounty.gov/dpwes/stormwater/
Fairfax County Watershed Planning
http://www.fairfaxcounty.gov/nvswcd/newsletter/planning.htm
Pohick Creek Watershed Plan
http://www.fairfaxcounty.gov/dpwes/watersheds/pohickcreek_docs.htm
EPA Water Quality Laws and Regulations
http://www.epa.gov/water/laws.html

57. Thank you
Contact Information
Holly Moran, P.E. – Engineer
703-324-5613
Holly.Moran@fairfaxcounty.gov
Justin Pistore – Project Manager
703-324-5685
A Fairfax County, justin.pistore@fairfaxcounty.gov
VA Publication
March 2013
Fairfax County Stormwater Planning Division
703-324-5500 TTY 711
12000 Government Center Parkway
Suite 449
Fairfax, Virginia 22035
www.fairfaxcounty.gov/dpwes/stormwater
To request this information in an alternate format call 703-324-5500,
TTY 711