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You certainly have a right to challenge the evaluation and request a meeting with management.
If you can't resolve the issue internally, you should contact the Dept. of Labor and Industry (http://www.lni.wa.gov/) and file a formal complaint. It sounds like you have already contacted L&I.
If you believe a meeting with management will go south in a hurry, it may be better to consult an attorney before the meeting and have him/her accompany you to the meeting.
If you believe that this matter is going to end with a complaint to L&I or civil court, it would be best to have an attorney involved from the beginning.
The company has a right to its opinion about your job performance, etc. However, if they base the opinion of false information that they know to be false, you could sue them for defamation of character, which is a civil matter more than an L&I issue.
It is advisable to have an attorney help you negotiate a severance. You can visit www.martindale.com and search for a labor attorney in your area. All of the attorneys listed here are best in their fields.