Can I use a shell script for deleting chunks from a watch folder?

Hello
I have a unique problem of needing to delete large files slowly off of an XSan.
I was wondering if there is a script I could use to delete 100gb chunks of files and folders that get placed in to a watch folder, slowly so as not to disrupt the other users. I would like to use Automator in OSX using a watch folder and a shell script. I am not a scriptor so I don't even know if what I am asking is possible, but thought I should ask because the current method is to manually delete them one by one in 5 minute increments. Thanks in advance.