I am trying to create a set of categories of various ways that
contaminants move through soils and water.  How do pollutants,
particularly from industrial land use, move through soils and water in
our environement?  I am most interested in a site specific scale.

Hi Patrick

There is a vast literature and research done on the topic.
Lot of the research was done by US government interested
in remediation of super-fund sites.
Example:
http://www.hanford.gov/cp/gpp/

Left to itself, contamination moves WITH the ground water 
for all practical purposes.
           (Diffusion exist but is negligible).

The groundwater moves in variety of ways.
 Speed may vary from  meters per year
to centimeters per century.

This example (slide 6)
http://maven.gtri.gatech.edu/ward/slide6.html

shows groundwater flowing down the hill and pushing water in the valley 
to the right. Any contaminant in the groundwater will move with the water,
and speed depends on local climate and geology.

  Is that what you mean by
      
          "site specific scale." ?

Please look through the content of this 'short' course

http://maven.gtri.gatech.edu/ward/contents.html


SEARCH TERMS: groundwater remediation


There are specific sites and techniques for cleaning up the sites,
(e.g. using steam to move it fast, when there is now water flow) e.g.

http://www.llnl.gov/str/Newmark.html

there are computer programs which say where to place pumps and cleaning
stations used to remove dissolved pollutants. There are conferences:

http://web.em.doe.gov/tie/sessxv.html

actually, whole industry 
http://www.environmental-expert.com/soil.asp

Which of these links are relevant?
If clarification is needed, please indicate in which detection, and on what
technical level, you would like to have the answer focused.

Classification (of groundwater, by level of contamination)
http://www.dem.ri.gov/programs/benviron/water/quality/prot/index.htm


 Ground Water Aquifer Classification. ... for CERCLA 
http://www.eh.doe.gov/oepa/guidance/gw/grndh2o.pdf



Numeric standards for the remediation of soil and groundwater
http://dep.state.ct.us/wtr/regs/remediation/rsrfactsheet.htm

Diverse technologies for different polutants 
http://64.233.179.104/search?q=cache:AamRw_hGxGgJ:www.globalbiosciences.com/downloads/MTBE_Reme_Groundwater.pdf+remediation+groundwater


http://www.frtr.gov/matrix2/appd_b/tableB_1.html
 REMEDIATION TECHNOLOGIES BY WASTE CONTAMINANT (overview)

....


Hedgie