colony park and woodlynne project information
DESCRIPTION
Colony Park and Woodlynne Project InformationTRANSCRIPT
Colony Park
Woodlynne
(PC9131) Facility Maintenance and Retrofit
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
Department of Public Works and
Environmental Services
(DPWES)
Land
Development
Services
Stormwater Wastewater Solid Waste Capital
Facilities
Stormwater
Planning
Division
Maintenance
& Stormwater
Management
Division
Environmental Services
Watershed Projects Implementation Branch
(WPIB)
• House Flood Mitigation
• Stream Restoration
• Outfall Restoration
• Site Retrofits
• Detention Basin Retrofits
• Regional Basin Retrofits
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
Countywide
Watershed
Planning
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
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
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
Stormwater Projects
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
Current Site Condition
Project Information
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.
Design Plan for Government Center
Detention Basin Retrofit
Before Construction
During Construction
Immediately After
Soon After
3 years after
Stream restoration before
Stream Restoration after
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
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
EXISTING CONDITIONS PRIOR TO
CONSTRUCTION
Fred Oaks project
CLEARING and GRADING
INSTALLING GROUND CONTROL
VIEW OF FINAL PROJECT
REFORESTATION OF SLOPES TO FOLLOW IN THE FALL
Before Construction
Sequoia Pond retrofit
Construction: Rock Structure Placement Construction: Pond Excavation and Formation of Channels
Construction: Installation of Concrete Riser Structure
Construction: Pond Stabilization
Completion: View of Outfall Channels and Low Flow Drainage Way
Completion: Access Road Utilizing Grass-Pavers
Completed Pond Retrofit
Cinnamon Oaks
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
Thank you
Contact Information Holly Moran, P.E. – Engineer
703-324-5613 [email protected]
Justin Pistore – Project Manager 703-324-5685
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
A Fairfax County,
VA Publication
March 2013