Hi i need to know how many work permits can be issued under EB5 visa after recruiting 10 US residents.?

you definitely can't bring any foreign workers directly under your own EB-5 status. so, as noted, either you'll have to bring them in some other way, or hire locally. of course, hiring locally was always the intent of the EB-5 program anyway. and you only get a conditional 2 year green card until you prove to USCIS that that is exactly what you're doing.