Realistic Filing Workload ? (repost in correct job catagory)

Hello,

I'm technically an administrative assistant but had been regulated to the status of file clerk for about the last year. The main reasons for this is that the document volume is ridiculously high and the records management system is extremely out of date. For example the department still prints out 1000 page telecom bills(even though we now scan and digitize almost all our documents), has no company wide filing standard, and no standardized procedure for accessing files, and has had no increase in storage space despite the increased volume.

Due to this the accuracy and up-todateness of the filing as suffered. Even though I've been bringing up these issues for a almost a little over year now. They've been ignored until recently when I got called into HR with all the blame placed on me for the current situation.

I was placed on a PIP and my deadline to catch up is in July. I know I can't make that deadline and will most likely lose my job. I had been documenting my attempts at being proactive about addressing these issues and the lack of response prior to the H/R incident. I've also been documenting my work day and issues that I come across that would effect my ability to meet the improvement deadline

Now I'm trying to find out approximately what a realistic workload is for a single filing clerk. Does anyone know of any studies or articles that I can forward to my supervisor and/or present as evidence in the case that I do get let go and have my unemployment comp claim denied? From referencing the spreadsheet that I use to make the labels for the filing I estimate that I am expected to manage 7000+ hard copy files. This is not including the really large accounts that take up multiple folders Is this realistic?