1

Ground Water Transport Processes

Ground WaterFlow Direction

Retardation of Contaminants that Sorb to Aquifer Solids

Plume Migration inFlow Direction

2

Ground Water PollutantsNon-point Human, Animal and Agricultural

Sources of Nitrate

Ground Water PollutantsAgricultural Chemicals

3

Ground Water PollutantsAgricultural Chemicals

Atrazine in WI groundwater

Pesticide detections

Ground Water PollutantsLandfill Leachate

Active and ClosedLandfills in WI

Volatile Organic Contaminants

4

Ground Water PollutionIndustrial Point Sources

Dense Nonaqueous Phase LiquidDNAPL

Ground Water PollutantsFuel Spills and Leaks

Dissolved Gasoline Components

Light Nonaqueous Phase Liquid

5

Superfund Sites in Wisconsin

Green = currentBlue = deleted

Purple = proposed

From USEPA

Ground Water PollutantsNaturally occurring contaminants

Arsenic Radionuclides

6

From USGS Circular 1156

Radon

7

Ground Water RemediationSuperfund Remedial Actions

Ground Water RemediationCommon Strategies

Source Removal Pump-and-Treat

8

Ground Water RemediationAdvanced Strategies

Pump-and-Treat with Barrier Steam Injection, Vacuum Extraction

Ground Water RemediationEmerging Strategies

Natural Attenuation by Biodegradation

9

Ground Water RemediationEmerging Strategies

Permeable Reactive Barriers