Subject
- Groundwater -- Pollution17
- Air -- Pollution -- Measurement6
- Groundwater -- Pollution -- Measurement6
- Groundwater -- Pollution -- Oregon -- Willamette River Valley6
- Nitrates -- Environmental aspects -- Oregon -- Willamette River Valley5
- Pesticides -- Environmental aspects5
- Groundwater -- Pollution -- Prevention3
- In situ bioremediation3
- Soils -- Pesticide content3
- Water -- Pollution -- Measurement3
- Biotransformation (Metabolism)2
- Fire extinguishing agents -- Environmental aspects2
- Groundwater -- Pollution -- California2
- Groundwater -- Pollution -- Oregon2
- Groundwater -- Purification -- California2
- Groundwater flow -- Mathematical models2
- Hydrocarbons -- Biodegradation2
- Hydrolysis2
- Indicators (Biology)2
- Nitrates -- Environmental aspects2