Oakton Swim & Racquet Club DF9045A      Oakton Estates DF9045B       Penderbrook DF9045D        February 18, 2013         ...
Tonight’s Meeting Agenda•   Stormwater Planning Division•   Environmental Services•   Watershed Planning•   Stormwater Pro...
MAJOR COMPONENTS OF FAIRFAX COUNTY’S       STORMWATER PROGRAM•   Conveyance Systems•   Dam Safety and Facility Rehabilitat...
STREAMS AND WATER QUALITY        STRUCTURAL PROJECTS    •   Detention Basin Retrofits    •   LID Implementation    •   Out...
Service Drivers• Federal  – Clean Water Act of 1972    • Municipal Separate Storm Sewer (MS4) Permit  – Total Maximum Dail...
Countywide Watershed Planning                                                 NICHOL                    SUGARLAND RUN     ...
Difficult Run Watershed          • Drains to the Potomac River and into            the Chesapeake Bay          • 58.3 squa...
Reasons for Countywide Watershed                   PlanningTo restore and protect the county’s streams, of which 80 percen...
Stormwater Projects    Community Goals & Objectives• Open lines of communication with communities.• Educate on project obj...
Ecological Goals & Objectives  • Establish an ecologically balanced system  • Remove undesirable plants and replace with n...
11
Current Site Conditions      3-locations                          12
Oakton Swim & Racquet Club Existing Conditions                                                 13
Oakton Swim & Racquet Club Existing Conditions                                                 14
Oakton Swim & Racquet Club Existing Conditions                                                 15
Oakton Swim & Racquet Club Existing Conditions                                                 16
Oakton Estates Existing Conditions                                     17
Oakton Estates Existing Conditions                                     18
Oakton Estates Existing Conditions                                     19
Oakton Estates Existing Conditions                                     20
Penderbrook Existing Conditions                                  21
Penderbrook Existing Conditions                                  22
Penderbrook Existing Conditions                                  23
Project Information                      24
Oakton Swim & Racquet Club Project Phase IA    (this project must be approved before the    Oakton Estates Project Phase I...
26
27
Oakton Estates Project Phase IIAAcross the street from Phase IA(cannot proceed without Phase IA)Proposed measures•   Work ...
29
30
Penderbrook Project Phase IBProposed measures•   Remove concrete ditch and install water quality improvements: extend the ...
32
33
34
ExamplesCompleted Projects                     35
Low Impact Development                Walt Whitman Middle School – Rain GardensArea Treated     Phosphorous         Nitrog...
Low Impact DevelopmentSherwood Library - Permeable Pavers & Rain Garden - Now                                             ...
Outfall Restoration                 Big Rocky Tributary – Before & AfterDrainage Area   Phosphorous         Nitrogen Remov...
Outfall Retrofits                       Sheffield Hunt– Before & AfterDrainage Area   Phosphorous Removal     Nitrogen Rem...
Detention Basin Retrofits                      Foxfield Section 13 - Before & AfterArea Treated   Phosphorous Removal     ...
Detention Basin Retrofits    Cinnamon Oaks Outfall into Basin - Before & After                                            ...
Pond Retrofits                       Sequoia Farms - Before & AfterArea Treated   Phosphorous Removal     Nitrogen Removal...
ExamplesAdditional Projects                      43
Stream Restoration   Dead Run – Before & After                               44
Stream Restoration                   Poplar Springs - Before & AfterDrainage Area   Phosphorous        Nitrogen Removal   ...
Stream Restoration                     Government Center - Before & AfterDrainage Area   Phosphorous Removal     Nitrogen ...
Next Steps…Feasibility study – winter 2013Stakeholder meeting (if necessary)Development of Conceptual DesignsSurveyPublic ...
Post Construction Activity   Plantings   – Within 30 days of construction completion   Maintenance          – Annual inspe...
ResourcesStormwater Planning Division Websitehttp://www.fairfaxcounty.gov/dpwes/stormwater/Fairfax County Watershed Planni...
Fairfax County Vision Elements•    To protect and enrich the quality of life for the people, neighborhoods and diverse com...
Questions?Thank You!               51
Contact Information               Holly Moran, P.E. – Project Engineer                          703-324-5613              ...
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Fairfax County Stormwater Presentation for Penderbrook HOA

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Fairfax County Stormwater Presentation for Penderbrook HOA

February 18, 2013

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Fairfax County Stormwater Presentation for Penderbrook HOA

  1. 1. Oakton Swim & Racquet Club DF9045A Oakton Estates DF9045B Penderbrook DF9045D February 18, 2013 1
  2. 2. Tonight’s Meeting Agenda• Stormwater Planning Division• Environmental Services• Watershed Planning• Stormwater Project Goals & Objectives• Project Information, Examples• Next Steps- Q/A 2
  3. 3. MAJOR COMPONENTS OF FAIRFAX COUNTY’S STORMWATER PROGRAM• Conveyance Systems• Dam Safety and Facility Rehabilitation• Emergency and Flood Response Operations• Stormwater Regulatory Program• Streams and Water Quality 3
  4. 4. STREAMS AND WATER QUALITY STRUCTURAL PROJECTS • Detention Basin Retrofits • LID Implementation • Outfall Improvement • Stream Restoration 4
  5. 5. Service Drivers• Federal – Clean Water Act of 1972 • Municipal Separate Storm Sewer (MS4) Permit – Total Maximum Daily Loads (TMDL)• Commonwealth – Virginia Stormwater Management Act – Chesapeake Bay Preservation Act 5
  6. 6. Countywide Watershed Planning NICHOL SUGARLAND RUN RUN POND BULL NECK RUN BRANCH SCOTTS RUN DEAD RUN WASHINGTON DULLES Town of TURKEY RUN INTERNATIONAL AIRPORT Herndon HORSEPEN CREEK DIFFICULT RUN PIMMIT RUN Town of Vienna Falls Church FOUR MILE RUN CUB RUN Arlington County City of BULL Fairfax RUN ACCOTINK POPES CREEK CAMERON City of Alexandria HEAD RUN CREEK BELLE Town of POHICK HAVEN LITTLE ROCKY RUN Clifton CREEK WOLF JOHNNY MOORE CREEK DOGUE LITTLE RUN SANDY CREEK HUNTING OLD MILL BRANCH RUN CREEK MILL RYANS DAM Oc River co BRANCH ac om qu a n Po t OCCOQUAN R iv er KANE CREEK HIGH POINT 6
  7. 7. Difficult Run Watershed • Drains to the Potomac River and into the Chesapeake Bay • 58.3 square miles To view the Difficult Run Watershed Management Plan please visit: http://www.fairfaxcounty.gov/dpwes/water sheds/difficultrun_docs.htm 7
  8. 8. Reasons for Countywide Watershed PlanningTo restore and protect the county’s streams, of which 80 percent arecategorized as being in “fair” to “very poor” conditionTo help meet state and federal water quality standards by identifyingstrategies to prevent and remove pollutionTo support Virginia’s commitment toward cleaning up the Chesapeake BayTo replace the outdated watershed management plans and incorporate theuse of new technologiesTo take a comprehensive approach in addressing multiple regulations,commitments, and community needs 8
  9. 9. Stormwater Projects Community Goals & Objectives• Open lines of communication with communities.• Educate on project objectives and goals.• Continue to coordinate and share information with the community. 9
  10. 10. Ecological Goals & Objectives • Establish an ecologically balanced system • Remove undesirable plants and replace with native vegetation • Extend the stormwater flow path with retrofit features • Slow down the velocity of runoff decreasing erosion • Infiltrate more runoff to reduce the quantity of stormwater runoff in streams which discharge to the bay • Reduce future maintenance • Reduce negative downstream impacts 10
  11. 11. 11
  12. 12. Current Site Conditions 3-locations 12
  13. 13. Oakton Swim & Racquet Club Existing Conditions 13
  14. 14. Oakton Swim & Racquet Club Existing Conditions 14
  15. 15. Oakton Swim & Racquet Club Existing Conditions 15
  16. 16. Oakton Swim & Racquet Club Existing Conditions 16
  17. 17. Oakton Estates Existing Conditions 17
  18. 18. Oakton Estates Existing Conditions 18
  19. 19. Oakton Estates Existing Conditions 19
  20. 20. Oakton Estates Existing Conditions 20
  21. 21. Penderbrook Existing Conditions 21
  22. 22. Penderbrook Existing Conditions 22
  23. 23. Penderbrook Existing Conditions 23
  24. 24. Project Information 24
  25. 25. Oakton Swim & Racquet Club Project Phase IA (this project must be approved before the Oakton Estates Project Phase IIA can proceed)Proposed measures• Install 3 rain gardens around the existing 3 drain inlets.• In county easements only: use amended soils around the tennis courts and in other locations that receive sheet flow and where acceptable.• In county easements only: Install vegetated swales in areas that receive concentrated stormwater runoff.• Identify areas (amended soils and/or vegetated swales) that could be landscaped with native plants and placed into a “do not mow” landscape feature.• Add native seed mix to take areas out of the mowing cycle and let areas naturalize with native plants where acceptable. 25
  26. 26. 26
  27. 27. 27
  28. 28. Oakton Estates Project Phase IIAAcross the street from Phase IA(cannot proceed without Phase IA)Proposed measures• Work only within the Oakton Estates property. Location of the work to be from a point south of the rip-rap to the property line. Rip-rap to remain in place. Work to include: raising the stream bed elevation, stabilizing the stream bed profile with riffle grade control structures, install grade control structures to stop the head cut, and stabilize the banks by sloping (Avoid mature trees) and install native vegetation and soil stabilization matting. 28
  29. 29. 29
  30. 30. 30
  31. 31. Penderbrook Project Phase IBProposed measures• Remove concrete ditch and install water quality improvements: extend the flow path, use micro- pools, and plant native vegetation.• Relocate spillway to Waples Mill side and plant screening vegetation on the Center Way side.• Provide grade control and bed material at the mouth of the incoming channel to avoid potential for head cutting due to removing the trickle ditch and changing elevations within the basin. 31
  32. 32. 32
  33. 33. 33
  34. 34. 34
  35. 35. ExamplesCompleted Projects 35
  36. 36. Low Impact Development Walt Whitman Middle School – Rain GardensArea Treated Phosphorous Nitrogen Removal Sediment Removal (acres) Removal (lbs/yr) (tons/yr) (lbs/yr) 36 1.29 2.2 4.7 0.6
  37. 37. Low Impact DevelopmentSherwood Library - Permeable Pavers & Rain Garden - Now 37
  38. 38. Outfall Restoration Big Rocky Tributary – Before & AfterDrainage Area Phosphorous Nitrogen Removal Sediment Removal (acres) Removal (lbs/yr) (tons/yr) (lbs/yr) 38 96 4 68 1
  39. 39. Outfall Retrofits Sheffield Hunt– Before & AfterDrainage Area Phosphorous Removal Nitrogen Removal Sediment Removal (acres) (lbs/yr) (lbs/yr) (tons/yr) 29.25 63.92 188 145.7 39
  40. 40. Detention Basin Retrofits Foxfield Section 13 - Before & AfterArea Treated Phosphorous Removal Nitrogen Removal Sediment Removal (acres) (lbs/yr) (lbs/yr) (tons/yr) 111 49 383 14 40
  41. 41. Detention Basin Retrofits Cinnamon Oaks Outfall into Basin - Before & After 41
  42. 42. Pond Retrofits Sequoia Farms - Before & AfterArea Treated Phosphorous Removal Nitrogen Removal Sediment Removal (acres) (lbs/yr) (lbs/yr) (tons/yr) 92.25 50.48 361.16 3.88 42
  43. 43. ExamplesAdditional Projects 43
  44. 44. Stream Restoration Dead Run – Before & After 44
  45. 45. Stream Restoration Poplar Springs - Before & AfterDrainage Area Phosphorous Nitrogen Removal Sediment Removal (acres) Removal (lbs/yr) (tons/yr) (lbs/yr) 230.4 7.5 141 1.25 45
  46. 46. Stream Restoration Government Center - Before & AfterDrainage Area Phosphorous Removal Nitrogen Removal Sediment Removal (acres) (lbs/yr) (lbs/yr) (tons/yr) 150 10.7 202 1.6 46
  47. 47. Next Steps…Feasibility study – winter 2013Stakeholder meeting (if necessary)Development of Conceptual DesignsSurveyPublic MeetingPreliminary Design – spring 2013Develop the conceptual design into a plan setFinal Design – spring 2013Public MeetingPreliminary design is developed into a construction ready plan set.Construction – TBD: fall/winter Public bid process Construction Notification Estimated Construction: Time 1 to 1.5 months each project 47
  48. 48. Post Construction Activity Plantings – Within 30 days of construction completion Maintenance – Annual inspection – Monitoring to ensure proper function and identify need for future maintenance 48
  49. 49. ResourcesStormwater Planning Division Websitehttp://www.fairfaxcounty.gov/dpwes/stormwater/Fairfax County Watershed Planninghttp://www.fairfaxcounty.gov/nvswcd/newsletter/planning.htmDifficult Run Watershed Planhttp://www.fairfaxcounty.gov/dpwes/watersheds/difficultrun_docs.htmEPA Water Quality Laws & Regulationshttp://www.epa.gov/water/laws.html 49
  50. 50. Fairfax County Vision Elements• To protect and enrich the quality of life for the people, neighborhoods and diverse communities of Fairfax County by:• Maintaining Safe and Caring Communities The needs of a diverse and growing community are met through innovative public and private services, community partnerships and volunteer opportunities. As a result, residents feel safe and secure, capable of accessing the range of services and opportunities they need, and are willing and able to give back to their community.• Building Livable Spaces Together, we encourage distinctive "built environments" that create a sense of place, reflect the character, history and natural environment of the community, and take a variety of forms -- from identifiable neighborhoods, to main streets, to town centers. As a result, people throughout the community feel they have unique and desirable places to live, work, shop, play and connect with others.• Connecting People and Places Transportation, technology and information effectively and efficiently connect people and ideas. As a result, people feel a part of their community and have the ability to access places and resources in a timely, safe and convenient manner.• Maintaining Healthy Economies Investments in the workforce, jobs, and community infrastructure and institutions support a diverse and thriving economy. As a result, individuals are able to meet their needs and have the opportunity to grow and develop their talent and income according to their potential.• Practicing Environmental Stewardship Local government, industry and residents seek ways to use all resources wisely and to protect and enhance the Countys natural environment and open space. As a result, residents feel good about their quality of life and embrace environmental stewardship as a personal and shared responsibility.• Creating a Culture of Engagement Individuals enhance community life by participating in and supporting civic groups, discussion groups, public-private partnerships and other activities that seek to understand and address community needs and opportunities. As a result, residents feel that they can make a difference and work in partnership with others to understand and address pressing public issues.• Exercising Corporate Stewardship Fairfax County government is accessible, responsible and accountable. As a result, actions are responsive, providing superior customer service and reflecting sound management of County resources and assets. 50
  51. 51. Questions?Thank You! 51
  52. 52. Contact Information Holly Moran, P.E. – Project Engineer 703-324-5613 Holly.Moran@fairfaxcounty.gov Justin Pistore – Project Manager 703-324-5685 Justin.Pistore@fairfaxcounty.gov 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 52
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