developing green stormwater design solutions for uic compliance presented by: adam zucker pe, cwre...
TRANSCRIPT
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
Underground Injection Control
- A federal program under the Safe Drinking Water Act that regulates the injection of fluids into the ground
Purpose:
To protect groundwater from contamination
What do we mean by UIC?
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
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
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
UIC 101 – Regulations
1980s- Federal UIC regulations are passed ◦ Define 5 classes of injection wells
- Washington Department of Ecology (DOE) andOregon Department of Environmental
Quality (DEQ)delegated the authority to administer
the UIC program - 1984
UIC 101 – Regulations
State UIC enforcement responsibilities - Primacy
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
Several subcategories for Class V wells
Septic Systems Groundwater RechargeHeating and CoolingGeothermal Stormwater Disposal
UIC 101 – Class V Wells
Injection Well Sump Soakage TrenchFrench Drain Seepage PitDrainfieldSoakaway
UIC 101 – Class V Stormwater Wells
UIC 101 – Class V Stormwater Wells…but for this presentation we generally mean
Drywells
UIC 101 – Drywells
UIC 101 – Wells
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
Generally requirement:
Groundwater Separation Requirements
The bottom of the drywell should be at least 10 feet above the groundwater table.
USGS Groundwater Study - 2008
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
Sorting out UIC compliance
Connecting to an Existing Storm System
Connecting to an Existing Storm System
Connecting to an Existing Storm System
Utility Conflicts
Utility Conflicts
Utility Conflicts
Utility Conflicts
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Connecting to an Existing Storm System
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Determining hydraulic capacity of drywell retrofit
- Drainage basin area
- Design storm
- Subsurface soil conditions
- Capacity tests
Retrofitting Existing Drywells
Retrofitting Existing Drywells
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
Surface Infiltration - Green Street / LID
-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
Surface Infiltration - Green Street / LIDDesign Challenges and Concerns
Questions
819 SE Morrison Street ● Suite 310 ● Portland, Oregon 97214 ● 503.274.2010 ● www.vigil-agrimis.com