2.  Changing Environment  Urban Contaminants of Concern ◦ Heavy Metals ◦ Polycyclic Aromatic Hydrocarbons (PAHs)  In Situ Remediation ◦ Mechanisms ◦ Influencing Factors  Conclusions

3.  Increasing urban/suburban development ◦ Transportation ◦ Impermeable area ◦ Water management ◦ Soil contamination

4.  Heavy Metals ◦ Pb, Mn, Cu, Zn ◦ Sources  Polycyclic Aromatic Hydrocarbons ◦ High/Low molecular weight ◦ Sources

5.  PAH Mechanisms ◦ Rhizospheric Biodegradation ◦ Phytodegradation ◦ Phytoaccumulation ◦ Phytostabilization  Heavy Metal Mechanisms ◦ Phytoaccumulation

6.  Retention Time ◦ Soil profile ◦ Plant selection  Climatic Considerations ◦ Plant selection ◦ Loading rate  Long Term Effects

7.  Sustainable Infrastructure  Need for Long Term Studies