There is 1 Dormant SIVA Cluster to be found in Rocketyard. They can be collected during any patrol.
Dormant SIVA Cluster: Clovis Bray 1.7[edit]
Head into the Plaguelands Rocketyard. Go to the back left portion, toward the entrance of the Refinery
Go into the doorway here and into the room.
In the room, turn to the right and look behind the computer monitor. You will find the Dormant SIVA Cluster.