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Stormwater and Wastewater Consolidation

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Stormwater and Wastewater Consolidation

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Stormwater and Wastewater Consolidation

  1. 1. Building Design and Construction Division Stormwater and Wastewater Consolidation October 30, 2017
  2. 2. Building Design and Construction Division Agenda 2 Stormwater Wastewater Consolidation • Welcome – Braddock District Supervisor, John Cook • Introduction – James Patteson, Director, DPWES • Project Overview • Transportation • Questions and Answers
  3. 3. Building Design and Construction Division Background 3 Stormwater Wastewater Consolidation Project Overview • New Stormwater and Wastewater Consolidation Facility • 23.7 Acres Total – Wastewater Collection Division Site & Concrete Plant Site
  4. 4. Building Design and Construction Division Traffic Impact Analysis – Facility Exit 4 Stormwater Wastewater Consolidation New Facility Exit: Channelized Right Turn Existing Facility Exit: Facility Policy on No Left Turn
  5. 5. Building Design and Construction Division Stormwater Wastewater Consolidation Staff & Vehicle Projections 5 Current 2017 Total Projected to 2037 Personal Vehicles County Vehicles Personal Vehicles County Vehicles 280 189 346 233 20 Year Projection - 2037
  6. 6. Building Design and Construction Division Traffic Impact Analysis 6 Stormwater Wastewater Consolidation Guidelines • All County vehicles enter and exit via Freds Oak Rd to Fairfax County Parkway • Per VDOT: A traffic signal will NOT be installed on Fairfax County Parkway • Traffic Analysis on a 20 year projected growth (year 2037) • Recommendations are based on peak hour projections Scenario A • All site vehicles (County and personal) use Freds Oak Rd to Fairfax County Parkway Scenario B • All County vehicles and a percentage of personal vehicles use Freds Oak Rd to Fairfax County Parkway
  7. 7. Building Design and Construction Division Traffic Impact Analysis – 2037 AM Site Traffic 7 Stormwater Wastewater Consolidation AM Peak traffic hours for roadway network vs proposed site: Trip Gen all vehicles (outs = county vehicles) Peak Hour 5:00 to 6:00 AM: 6:00 to 7:00 AM: 7:00 to 8:00 AM: 8:00 to 9:00 AM: Analysis Hours Maximum 126 in, 0 out 145 in, 147 out 62 in, 8 out 9 in, 11 out Roadway AM Peak Hour – 7:45 to 8:45 AM Expected 101 in, 0 out 116 in, 63 out 50 in, 3 out 7 in, 5 out
  8. 8. Building Design and Construction Division Traffic Impact Analysis – 2037 PM Site Traffic 8 Stormwater Wastewater Consolidation PM Peak traffic hours for roadway network vs proposed site: Trip Gen all vehicles (in = county vehicles) Peak Hour 2:00 to 3:00 PM: 3:00 to 4:00 PM: 4:00 to 5:00 PM: 5:00 to 6:00 PM: Maximum 128 in, 126 out 4 in, 140 out 0 in, 62 out 0 in, 9 out Roadway PM Peak Hour – 5:00 to 6:00 PM Expected 55 in, 100 out 3 in, 104 out 0 in, 27 out 0 in, 4 out Analysis Hours
  9. 9. Building Design and Construction Division Traffic Impact Analysis – Options 9 Stormwater Wastewater Consolidation Option 1: New Traffic Signal at Fairfax Co. Pkwy & Freds Oak Road • Based on discussions with VDOT • Interchange spacing standards
  10. 10. Building Design and Construction Division Traffic Impact Analysis – Freds Oak Rd. Options 10 Stormwater Wastewater Consolidation Option 2: Left Turn Restrictions to FF Co Pkwy during Peak Traffic Hours • Improves operations • Prohibits left turns during peak hours
  11. 11. Building Design and Construction Division 11 Stormwater Wastewater Consolidation • Improves operations • Prohibits left and through movements Traffic Impact Analysis – Freds Oak Rd. Options Option 2A: 24-hour Left Turn Restrictions to FF Co Pkwy
  12. 12. Building Design and Construction Division 12 Stormwater Wastewater Consolidation Option 3: New Right Turn Lane at Fairfax Co. Pkwy & Freds Oak Road Traffic Impact Analysis – Freds Oak Rd. Options • Improved operations for right turns • Left and thru movements still experience high delay
  13. 13. Building Design and Construction Division Traffic Impact Analysis – Clara Barton Dr. Options 13 Stormwater Wastewater Consolidation Option 4: Modify Traffic Signal at Clara Barton Dr. and Ox Rd. • Only applies to Scenario B • Similar operations to No-Build • Minimal Right of Way impacts
  14. 14. Building Design and Construction Division Traffic Impact Analysis – Clara Barton Dr. Options 14 Stormwater Wastewater Consolidation Option 5: Modify Approach to Signal at Clara Barton Dr. and Ox Rd. • Only applies to Scenario B • Improves approach to traffic signal
  15. 15. Building Design and Construction Division Traffic Impact Analysis – Freds Oak Road/FF Co Pkwy 15 Stormwater Wastewater Consolidation 2037 Delay (seconds/vehicle) Right-Turn Lane Left-Turn Lane Right-Turn Lane Left-Turn Lane AM Peak Hour (6-7 AM) 34 44 41 108 Same as Scenario A AM Peak Hour (7-8 AM) 166 48 45 647 Same as Scenario A PM Peak Hour (2-3 PM) 87 31 25 285 28 25 182 PM Peak Hour (3-4 PM) 417 114 67 1079 83 62 651 PM Peak Hour (4-5 PM) 742 158 92 1653 113 83 1082 Scenario B County Veh to Fred's Oak/FF Co Pkwy Personal Veh to Fred's Oak/FF Co Pkwy & Clara Barton/Ox Rd Restricted Left Turns Construct New Right-Turn Lane Peak Hour Restricted Left Turns Construct New Right-Turn Lane Scenario A All site traffic to Fred's Oak/FF Co Pkwy No-Build (Baseline) Additional queue analysis conducted
  16. 16. Building Design and Construction Division Traffic Impact Analysis – Freds Oak 4-5 PM Queue 16 Stormwater Wastewater Consolidation PM 2037 No Build: 8 vehicles in queue = 200 feet queue length PM Existing: 5 vehicles in queue = 125 feet queue length PM 2037 Build All Traffic to Freds Oak/FF Co Pkwy Restricted Left Turns 7 vehicles in queue = 175 feet queue length PM 2037 Build All Traffic to Freds Oak/FF Co Pkwy New Right-Turn Lane 5 vehicles in queue = 125 feet queue length
  17. 17. Building Design and Construction Division Traffic Impact Analysis – Clara Barton Dr./Ox Rd. 17 Stormwater Wastewater Consolidation 2037 Delay (seconds/vehicle) Scenario A All site traffic to Fred's Oak/FF Co Pkwy Scenario B County Veh to Fred's Oak/FF Co Pkwy Personal Veh to Fred's Oak/FF Co Pkwy & Clara Barton/Ox Rd Signal Modifications Signal Modifications AM Peak Hour (6-7 AM) 61 No impacts from site traffic No impacts from site traffic AM Peak Hour (7-8 AM) 56 No impacts from site traffic No impacts from site traffic PM Peak Hour (2-3 PM) 69 No impacts from site traffic 38 PM Peak Hour (3-4 PM) 68 No impacts from site traffic 38 PM Peak Hour (4-5 PM) 72 No impacts from site traffic 42 Peak Hour No-Build (Baseline) Additional queue analysis conducted
  18. 18. Building Design and Construction Division Traffic Impact Analysis – Clara Barton 4-5 PM Queue 18 Stormwater Wastewater Consolidation PM 2037 No Build: 5 vehicles in queue = 125 feet queue length PM Existing: 4 vehicles in queue = 100 feet queue length PM 2037 Build County Vehicles to Freds Oak/FF Co Pkwy Signal Modifications 4 vehicles in queue = 100 feet queue length – EACH LANE
  19. 19. Building Design and Construction Division Traffic Impact Analysis 19 Stormwater Wastewater Consolidation Questions? Comments?
  20. 20. Building Design and Construction Division Feedback Resources 20 Stormwater Wastewater Consolidation Direct e-Mail Braddock@fairfaxcounty.gov Tiya.Raju@fairfaxcounty.gov (Tiya Raju- Fairfax County DPWES Project Manager) Project Website: http://www.fairfaxcounty.gov/dpwes/c onstruction/consolidating- management-programs-one- location.htm
  21. 21. Building Design and Construction Division Traffic Impact Analysis 21 Stormwater Wastewater Consolidation Thank You

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