I was not aware that all prospective science students are required to complete a supplimentary application in order to be considered for admission. I was relying solely on email for updates on supplimentary application due dates, and whether or not they applied to myself. At this point in time; I have learned that the date has passed. Is there any possible way to still submit my supplimentary? If not, who should I contact within McMaster to explain my situation? All information is appreciated, thanks.

Contact the admissions people. Make sure you spell supplementary properly in your email to them, or better yet, call them.
I don't recall first year science requiring a supplementary application, so make sure you've got your facts straight first. (It may very well have changed and you might be right, but double check that to make sure before doing anything).

The faculty of Science does NOT require supplementary applications. The only level 1 programs that require supplementary applications is Health Sciences, Integrated Science, and Arts & Science. (Proof: http://future.mcmaster.ca/2016/01/05...-applications/)

Thanks very much to those who replied! I admit I was in a panic, and did not spend enough time formulating the post (bad spelling).

I can breath easy again, very relieved to have the real information.

This site is an excellent source of info, and I will no doubt use it again.