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Urban Water Quality Issues

NACAA Annual Meeting & Professional Improvement Conference. Urban Water Quality Issues. July 17th, 2008 Greensboro, North Carolina. Development Patterns. Ultra Urban Environment. Increasing: impervious areas land value Decreasing land availability Increasing Need for:

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Urban Water Quality Issues

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  1. NACAA Annual Meeting & Professional Improvement Conference Urban Water Quality Issues July 17th, 2008 Greensboro, North Carolina

  2. Development Patterns

  3. Ultra Urban Environment Increasing: impervious areas land value Decreasing land availability Increasing Need for: Space Efficient Best Management Practices

  4. Typical Urban Non-Point Source Pollutant Loading

  5. Typical Urban Non-Point Source Pollutant Loading Algae bloom; York River, 9/9/05 Courtesy Bill Portlock, Chesapeake Bay Foundation

  6. Why is it that this particular design does not have to follow the fundamental unit processes of water quality?

  7. Physics of Settling – Stokes Law Media Filtration – Darcy’s Law Henry Darcy 1803 - 1858

  8. BMP Evaluation In the Lab; or in the Field?

  9. Lesson 1: Clearly Defined Project Goals Quality Assurance Project Plan • Conditions and Definitions • Treatment Objective • Performance Goals • Project Description • Quality Assurance Plan

  10. Treatment Objectives and Performance Goals

  11. Treatment Objectives and Performance Goals Particle Size

  12. Treatment Objectives and Performance Goals

  13. Treatment Objectives and Performance Goals

  14. Treatment Objectives and Performance Goals

  15. Treatment Objectives and Performance Goals

  16. Lesson 2: Sample Collection Grab samples Flow-paced auto samples

  17. Multiple Grabs =Multiple Snapshots One Grab = One Snapshot

  18. Lesson 3: Site Selection - Location Currituck Gas House Barco, NC

  19. Trench Drain from up-hill side of pumps Trench Drain on down-hill side of Oil-Water separator Canopy drain StormFilter Vault Outlet junction manhole Bypass/Diversion manhole Lesson 3: Site Selection - Simplicity

  20. Simple is better! 1 pipe in and 1 pipe out!

  21. Eliminate Variables and External Influences (MEP) Lesson: All fuel islands should have an Oil/Water Separator

  22. Lesson 4: Learn the 1st Law of Monitoring: What Can Go Wrong, Will Go Wrong!

  23. Once upon a time, there was this site . . . • 10/02 System Maintenance • 10/02 Remote automated sampling equipment Installed • 11/02 Remote automated sampling equipment disabled by insect infestation

  24. Corrective Action Taken

  25. As Luck Would Have It (or not): • 1-2/03 Storm Capture • 5/03 Phone Line Disabled by Lightning • 6/03 Automated Sampling Equipment Fried by Lightning

  26. But then . . . • 9/03 New Automated Sampling Equipment Installed • 9/03 System Outfall Area Impacted by Adjacent Construction Activities and Heavy Storms

  27. Hurricane Isabel

  28. 2/04 Outfall Area Restored Before After

  29. The Saga Continues: • 3/04 Storm Capture • 8-9/04 Phone lines and Automated Sampling Equipment Disabled by Lightning (again); AND

  30. Alex, Bonnie, & Earl – 8-9/04

  31. We Are Committed! • 6/05 Resume Monitoring

  32. No Matter What . . . • 9/05 Rodents

  33. Corrective Action Taken AND THEN:

  34. We Survived Hurricane Season ‘05

  35. Happily Ever After • 8/06 Project Completed!

  36. Lesson 5: Predict the Weather and Act Fast

  37. We Got Better!

  38. Key Elements to a Successful Field Monitoring Project Clearly defined Project Goals Data Quality Objectives Methods Appropriate Site Selection Dedicated Project Team

  39. Adaptive management in action As Conceived in Consensus Building Process As Designed in Consensus Building Process From: Restoration of Puget Sound Rivers Ralph and Poole, 2003

  40. Adaptive management in pieces As generally implemented

  41. Experimentation in the Urban Environment We’re running out of experimental opportunities!

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