EAD i765 withdraw procedure

[ineedhelp1986]

Hi All,

I applied I765 in Jan 2011...but its in initial review state now(Nebraska).
Because of some urgent reason i have to leave US in April ...& no such fiexed plan to come back in US near future.

So m planning to withdraw i765 application...So anybody knows answer to my questions,

1.what is the procedure to withdraw?
2.Whats a address for Mail OR Email OR Phone Number?
3.What information do i need to submit?
4.How much time it will take to withdraw?


Thanks :)