Sub-module 2B, page 2
When considering routes of exposure, developing a site conceptual exposure model (SCEM) will help you organize your work. Here are some basic SCEM terms. These were lifted from a program which draws SCEMs. The program is written by the Department of Energy and is available for download. http://tis.eh.doe.gov/oepa/programs/scem.cfm We won't use the model builder, it does not lend too much, but the program has a neat "SCEM Help," that you can have here. (when you click on Open SCEM Help below, your browser should offer you the option of opening the file,or saving it to a disk. I suggest you save it to a convenient place, then minimize your browser and double click on the file. It has a standard help file format and your windows program should open it.) Open the four main divisions and read the SCEM Introduction (use the "contents" button to return each time) and at least one entry from each of these:
Contaminant Sources
Release Mechanisms
Exposure Pathways
Receptors
Note some of the interesting contaminant sources. This is a DOE programs and there had some unique type of sources. The DOE uses the term "exposure routes" a little differently than I do.