Wow. Those are some huge raster images, Doug.
In any event, there shouldn't be any AITEMP folders left if you quit AI 10 normally. (That's not the case with AI 12, which leaves AITEMP folders behind on designated scratch disks.) I must say, however, that I've never worked with placed images that large, so I wouldn't know whether there might be some different behavior under those circumstances.
You can automate trashing of AITEMP folders by launching AI via a batch file. Example:
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@echo off
c: {or drive letter which corresponds to the AI install drive}
cd {directory path to Illustrator.exe, usually ending in '...Support Files\Contents\Windows}
start /max /wait illustrator.exe %1
c:
cd \
rd /s /q x:\aitemp {where 'x' is the drive letter or path of your first scratch disk}
rd /s /q y:\aitemp {where 'y' is the drive letter or path of your second scratch disk}
exit
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Don't enter my comments in braces { }. Save the above (out of Notepad or equivalent) as startAI.bat (or whatever but with the .bat extension). Set batch file properties to run minimized. Also reassign file association for all desired extensions, such as .ai, so that startAI.bat (and not illustrator.exe) is the default application.
This method has the added benefit of starting AI maximized (rather than in a window). If you do not want that to happen, remove the '/max' parameter from the 'start' command.