Here is the link from Ed's AWG site Q&A's
http://www.ed.gov/offices/OSFAP/DCS/awg.htmlThis is the link for employer questions (very useful information, even for a borrower)
http://www.ed.gov/offices/OSFAP/DCS/awg.employers.guide.htmlIt is great if your employer wants to help you but please don't forget if they go into Noncompliant Employer Status (which they soon will if they don't start witholding from your paycheck) They can be held liable for your loans and Dept of Ed can sue them for what
you owe. If they're a good employer you certainly don't want them to end up in that position. After the 2nd notice is sent they have precious little time to get the Garnishment started. There isn't much you can do now except file an Untimely hearing. From what I've read it appears you'll want to file for a reduced amount. Ed will want proof of all of your necessary bills (rent, insurance, utilities etc). During the time your Hearing is being reviewed you will still be garnished since this is untimely. If you were terminated from your last job and have been at the new employer less than 12 months you can also appeal. (see links for more specific info).
A word of warning: Simply quitting and moving on to another employer is a bad idea because come next year IRS will update to Ed again and they'll have your new employer.