Talk with site contact prior to visit.
Go to site and get access to the drives to be drilled.
Hard drive Drill.
Sign off work sheet mentioning serial number of every drive.
Take leftovers (drives + equipment) off site and trash them at recycling center and get certificate of destruction after noting down the weight and no of equipment to be trashed on COD and also if there is any equipment being resold.
(and note recycling company info in section C3 of the WTN form)