Hello,
I have looked at your project description, and I have carried out similar proofreading tasks for clients who are non-native English speakers. I'm a native UK English speaker, and have a long list of satisfied clients on this website with the numerous proofreading projects which I have handled.
Kindly contact me for more information, and how I can assist you in working on this 90 pages document.
Regards,
Quicklancer15