Intel #28) As soon as the mission starts, in the first shack is Bio Lab's first intel.
Intel #29) The second intel is further into the level after hacking the computer. Stay on the right until you come to a room with a large contraption forking the path.
Intel #30) After climbing the ladder and setting the charge, run through the newly opened doors and up some stairs. Cross the outdoor walkway, and in the next room shoot out the glass and jump in to find Bio Lab's third intel.