When you say applied... you mean the official application (the school's application form, transcripts etc.) ?
because you should have gotten an email saying
" Thank you for your email.
We received your documents on December 10, 2013. Please keep in mind that our processing procedures will take anywhere between 8 to 12 weeks from the time we receive your signed application and the required supporting documents. You will receive our decision by email. "
i sent my documents on the 6th of December 2013 but they only acknowledge receipt of it on the 10th. ( i am guessing thats the day they got to it)
The fall semesters are usually the most hectic time because that is when majority of students apply for college. It is a possibility that they have not yet 'got to' your application. Today is the 9th working day since you have submitted your application. i say give it until the end of the week.
if nothing, you can always write an email to international admin (internationaladmissions @ senecacollege.ca) inquiring to the status of your application
I hope i was some sort of help