What a Drycleaner contamination site like Marinwood Plaza looks like in a 3D animation.

Marinwood Plaza ,  Toxic Waste site contamination contains PCE and TCE and is expected to look similar to this 3 D animation of a site along the Ohio River.

Note that PCE and TCE goes BELOW the groundwater level and can spread far.  If you substitute "San Francisco Bay" for Ohio River, you have a pretty good model for the Prosperity Cleaners Site. Obviously the data and the plume spread will be different.