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Developing Green Stormwater Design Solutions For UIC Compliance

Developing Green Stormwater Design Solutions For UIC Compliance Presented by: Adam Zucker PE, CWRE. 819 SE Morrison Street ● Suite 310 ● Portland, Oregon 97214 ● 503.274.2010 ● www.vigil-agrimis.com. What do we mean by UIC?.

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Developing Green Stormwater Design Solutions For UIC Compliance

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  1. Developing Green Stormwater Design Solutions For UIC Compliance Presented by: Adam Zucker PE, CWRE 819 SE Morrison Street ● Suite 310 ● Portland, Oregon 97214 ● 503.274.2010 ● www.vigil-agrimis.com

  2. What do we mean by UIC? Underground Injection Control- A federal program under the Safe Drinking Water Act that regulates the injection of fluids into the groundPurpose: To protect groundwater from contamination

  3. UIC 101 – History Of Injection Wells Early Injection- Injection of water to extract salts was documented in China around 300 A.D. and in France in the 9th Century

  4. UIC 101 – History Of Injection Wells 1930s - Oil and Gas Extraction 1940s - Oil refineries begin to inject wastes into ground 1950s- Chemical companies begin injecting industrial waste into deep wells

  5. UIC 101 – History Of Injection Wells 1960s - Deep well injection causes earthquakes in Colorado - 1st documented case of drinking water contamination 1970s - Wastes spilling out of an abandon oil well traced to an injection well used by a pulp mill some distance away - Congress passes the Safe Drinking Water Act - 1974

  6. UIC 101 – Regulations 1980s- Federal UIC regulations are passed ◦ Define 5 classes of injection wells - Washington Department of Ecology (DOE) and Oregon Department of Environmental Quality (DEQ) delegated the authority to administer the UIC program - 1984

  7. UIC 101 – Regulations State UIC enforcement responsibilities - Primacy

  8. UIC 101 – Classes of Injection Wells Class I : Deep injection wells for municipalities and industries (549 wells) Class II : Oil and Gas production (143,951 wells) Class III : Mineral Extraction (18,505 wells) Class IV : Shallow storage of hazardous and radioactive wastes. Banned in 1984 (32 sites) Class V : All other injection wells (400,000 to 650,000 wells) well inventory numbers based on EPA data

  9. UIC 101 – Class V Wells Several subcategories for Class V wells Septic Systems Groundwater Recharge Heating and Cooling Geothermal Stormwater Disposal

  10. UIC 101 – Class V Stormwater Wells Injection Well Sump Soakage Trench French Drain Seepage Pit Drainfield Soakaway

  11. UIC 101 – Class V Stormwater Wells …but for this presentation we generally meanDrywells

  12. UIC 101 – Drywells

  13. UIC 101 – Wells

  14. UIC 101 – Back to the Regulations - In 1999 Federal regulations for Class V UICs are revised/clarified States begin to revise their rules and adopt the following general requirements: ◦ Must be registered ◦ Have no impact on water Quality ◦ Meet all other state and federal requirements ◦ Stormwater only; runoff minimized ◦ No other disposal options ◦ Isolated from Drinking water sources ◦ No soil or groundwater contamination ◦ Not deeper than 100’ AND adequate groundwater separation ◦ Pretreatment and spill prevention

  15. Groundwater Separation Requirements The bottom of the drywell should be at least 10 feet above the groundwater table. Generally requirement:

  16. USGS Groundwater Study - 2008

  17. Sorting out UIC compliance How to deal with the groundwater vertical separation requirements? - Connect into a piped stormwater conveyance system - Modify the existing drywell - Surface Infiltration – LID and Green Streets

  18. Connecting to an Existing Storm System

  19. Connecting to an Existing Storm System

  20. Connecting to an Existing Storm System

  21. Utility Conflicts

  22. Utility Conflicts

  23. Utility Conflicts

  24. Utility Conflicts

  25. Retrofitting Existing Drywells

  26. Retrofitting Existing Drywells

  27. Retrofitting Existing Drywells

  28. Retrofitting Existing Drywells

  29. Retrofitting Existing Drywells

  30. Retrofitting Existing Drywells

  31. Retrofitting Existing Drywells

  32. Connecting to an Existing Storm System

  33. Retrofitting Existing Drywells

  34. Retrofitting Existing Drywells Determining hydraulic capacity of drywell retrofit - Drainage basin area - Design storm - Subsurface soil conditions - Capacity tests

  35. Retrofitting Existing Drywells

  36. Retrofitting Existing Drywells

  37. Surface Infiltration - Green Street / LID

  38. Surface Infiltration - Green Street / LID

  39. Surface Infiltration - Green Street / LID

  40. Surface Infiltration - Green Street / LID

  41. Surface Infiltration - Green Street / LID

  42. Surface Infiltration - Green Street / LID

  43. Surface Infiltration - Green Street / LID

  44. Surface Infiltration - Green Street / LID

  45. Surface Infiltration - Green Street / LID

  46. Surface Infiltration - Green Street / LID Design Challenges and Concerns -No longer an overflow to storm sewer system Space constraints; limited right-of-way -Capturing all the runoff at intersections - Facility Longevity - Be conservative and provide redundancy

  47. Questions 819 SE Morrison Street ● Suite 310 ● Portland, Oregon 97214 ● 503.274.2010 ● www.vigil-agrimis.com

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