Developing Green Stormwater Design Solutions For UIC Compliance Presented by: Adam Zucker PE, CWRE...
-
Upload
stanley-little -
Category
Documents
-
view
220 -
download
2
Transcript of Developing Green Stormwater Design Solutions For UIC Compliance Presented by: Adam Zucker PE, CWRE...
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 – 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 – 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.
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
Retrofitting Existing Drywells
Determining hydraulic capacity of drywell retrofit
- Drainage basin area
- Design storm
- Subsurface soil conditions
- Capacity tests
-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