The IRS has some very strict rules concerning independ contractor vs. employee.
In a nutshell, if the worker is on site with you, under your direction, using your tools, he is an employee, subject to all payroll liabilities.
On the other hand, if you mearly give him the task of "clean up", and a set of basic instructions, and he does the work on his own, without your direction, then he may be able to be classified as a sub contractor.
Suggest you paruse the IRS website for further details.
In your case, a temp agency may be the way to go.