How To Prevent Datatype Conversion When Importing Tables From Excel????

I'm building a database at work to see if we can replace some of the "buhzillion" spreadsheets we currently use to track data on sites and employees across the country. I've set up the primary excel tables the way I want to import them, but Access keeps converting my Employee Numbers (mostly 7 digit numbers, "text" format in excel) to scientific notation during the import process and then giving me errors because my primary key "EmployeeNumber" has duplicates. How do I tell Access to import these as text instead of numbers? I'd really like to not have to type in data for 100+ employees and over 1000 sites, you know?

Thanks in advance.