2005 Chevy Avalanche engine block coolant drain plug(s)

I have an 05 Avalanche and I'd like to drain my coolant from the block. I'm pretty sure i found the driver side plug, a brass plug that will take a giant allen head socket, but i cant locate the passenger side. Is there a possibility that there isnt another plug? And if there is where is it? Please help! No tips on other ways to flush the radiator i would just like to know about the plug please. Thank you!